diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/Makefile | 58 | ||||
| -rw-r--r-- | doc/filegraph.dot | 287 | ||||
| -rw-r--r-- | doc/luaotfload-context.tex | 485 | ||||
| -rw-r--r-- | doc/luaotfload-latex.tex | 448 | ||||
| -rw-r--r-- | doc/luaotfload-main.tex | 1591 | ||||
| -rw-r--r-- | doc/luaotfload-tool.rst | 325 | ||||
| -rw-r--r-- | doc/luaotfload.conf.example | 30 | ||||
| -rw-r--r-- | doc/luaotfload.conf.rst | 347 |
8 files changed, 3571 insertions, 0 deletions
diff --git a/doc/Makefile b/doc/Makefile new file mode 100644 index 0000000..ed340a4 --- /dev/null +++ b/doc/Makefile @@ -0,0 +1,58 @@ +NAME = luaotfload +DOCPDF = $(NAME).pdf +DOCSRC = $(NAME)-latex.tex + +SCRIPTNAME = luaotfload-tool +TOOLMANSRC = $(SCRIPTNAME).rst +TOOLMAN = $(SCRIPTNAME).1 + +CONFNAME = luaotfload.conf +CONFMANSRC = $(CONFNAME).rst +CONFMAN = $(CONFNAME).5 + +MANPAGES = $(TOOLMAN) $(CONFMAN) + +GRAPH = filegraph +DOTPDF = $(GRAPH).pdf +DOT = $(GRAPH).dot + +DOCS = $(DOTPDF) $(DOCPDF) $(MANPAGES) + +DO_LATEXMK = @latexmk -e '$$max_repeat = 5' -pdf -lualatex -silent $< >/dev/null +# latexmk does only one run on my machine, so we’re not going to rely on it +DO_LATEX = @lualatex -interaction=batchmode $< >/dev/null +DO_GRAPHVIZ = @dot -Tpdf -o $@ $< > /dev/null +DO_DOCUTILS = @rst2man $< >$@ 2>/dev/null + +doc: graph $(DOCPDF) +all: manuals doc +graph: $(DOTPDF) +manuals: $(TOOLMAN) $(CONFMAN) + +$(DOCPDF): $(DOCSRC) + @echo "creating PDF documentation ($@)" + $(DO_LATEX) + $(DO_LATEX) + mv -f -- $(<:tex=pdf) $@ + +$(TOOLMAN): $(TOOLMANSRC) + @echo "creating man page ($(TOOLMAN))" + $(DO_DOCUTILS) + +$(CONFMAN): $(CONFMANSRC) + @echo "creating man page ($(CONFMAN))" + $(DO_DOCUTILS) + +$(DOTPDF): $(DOT) + @echo "creating file graph ($(DOTPDF))" + $(DO_GRAPHVIZ) + +.PHONY: clean mrproper + +clean: + @$(RM) -- *.log *.aux *.toc *.idx *.ind *.ilg *.out + +mrproper: clean + @$(RM) -- $(DOCS) + +# vim:noexpandtab:tabstop=8:shiftwidth=2 diff --git a/doc/filegraph.dot b/doc/filegraph.dot new file mode 100644 index 0000000..47db9ea --- /dev/null +++ b/doc/filegraph.dot @@ -0,0 +1,287 @@ +strict digraph luaotfload_files { //looks weird with circo ... + compound = true; + +// label = "Schematic of the files included in Luaotfload."; +// labelloc = "b"; + + fontsize = "14.4"; + labelfontname = "Iwona Medium Regular"; + fontname = "Iwona Light Regular"; + size = "21cm"; + + rankdir = LR; + ranksep = 0.618; + nodesep = 1.618; + + edge [ + arrowhead = onormal, + fontname = "Iwona Cond Regular", + penwidth = 1.0, + ]; + node [ + //penwidth = 0.7, + fontname = "Liberation Mono", + fontsize = 12, + ]; + +/* ···································································· + * file structure + * ································································· */ + fontdbutil -> font_names [label="--update", + style=dashed] + + luaotfload -> otfl_fonts_merged [label="merged"] + luaotfload -> merged_lua_libs [label="unmerged", style=solid] + luaotfload -> merged_luatex_fonts [label="unmerged", style=solid] + luaotfload -> merged_context_libs [label="unmerged", style=solid] + + luaotfload -> luaotfload_libs + luaotfload -> otfl_blacklist_cnf + + otfl_fonts_merged -> merged_lua_libs [label="merged", + style=dotted, + lhead=cluster_merged] + otfl_fonts_merged -> merged_luatex_fonts [label="merged", + style=dotted, + lhead=cluster_merged] + otfl_fonts_merged -> merged_context_libs [label="merged", + style=dotted, + lhead=cluster_merged] + + merged_luatex_fonts -> font_age [label="luatex-fonts-enc.lua", + ltail=cluster_merged] + + fontdbutil -> fontdbutil_diagnostics [label="--diagnose"] + + fontdbutil -> status [label="version information"] + + fontdbutil_diagnostics -> status [constraint=no, label="hash files"] + + merged_luatex_fonts -> characters [label="luaotfload-auxiliary.lua", + ltail=cluster_merged] + + luaotfload_libs -> font_names [label="luaotfload-database.lua"] + + mkstatus -> status [label="generates from distribution files", + style=dashed] + + mkglyphlist -> font_age [label="generates from glyphlist.txt", + style=dashed] + + mkcharacters -> characters [label="generates from Context’s char-def.lua", + style=dashed] + + subgraph { rank = same; + mkcharacters; + mkglyphlist; + mkstatus; + fontdbutil; + luaotfload } + +/* ···································································· + * main files + * ································································· */ + + fontdbutil [label = "luaotfload-tool.lua", + shape = rect, + width = "3.2cm", + height = "1.2cm", + color = "#01012222", + style = "filled,rounded", + penwidth=2] + + fontdbutil_diagnostics [label = "luaotfload-diagnostics.lua", + shape = rect, + width = "3.2cm", + height = "1.2cm", + color = "#01012222", + style = "filled,rounded", + penwidth=2] + + mkstatus [label = "mkstatus", + shape = rect, + width = "3.2cm", + height = "1.2cm", + color = "#01012222", + style = "filled,rounded", + penwidth=2] + + mkglyphlist [label = "mkglyphlist", + shape = rect, + width = "3.2cm", + height = "1.2cm", + color = "#01012222", + style = "filled,rounded", + penwidth=2] + + mkcharacters [label = "mkcharacters", + shape = rect, + width = "3.2cm", + height = "1.2cm", + color = "#01012222", + style = "filled,rounded", + penwidth=2] + + luaotfload [label = "luaotfload-main.lua", + shape = rect, + width = "3.2cm", + height = "1.2cm", + color = "#01012222", + style = "filled,rounded", + penwidth=2] + /* + *otfl_fonts [label = "luaotfload-fonts.lua", + * shape = rect, + * width = "3.2cm", + * height = "1.2cm", + * color = "#01012222", + * style = "filled,rounded", + * penwidth=2] + */ + otfl_fonts_merged [label = "luaotfload-fontloader.lua", + shape = rect, + width = "3.2cm", + height = "1.2cm", + color = "#01012222", + style = "filled,rounded", + penwidth=2] + +/* ···································································· + * luaotfload files + * ································································· */ + + characters [style = "filled,dashed", + shape = rect, + width = "3.2cm", + fillcolor = "#01012222", + color = grey40, + style = "filled,dotted,rounded", + label = "luaotfload-characters.lua"] + + font_age [style = "filled,dashed", + shape = rect, + width = "3.2cm", + fillcolor = "#01012222", + color = grey40, + style = "filled,dotted,rounded", + label = "luaotfload-glyphlist.lua"] + + font_names [style = "filled,dashed", + shape = rect, + width = "3.2cm", + fillcolor = "#01012222", + color = grey40, + style = "filled,dotted,rounded", + label = "luaotfload-names.lua.gz\nluaotfload-names.luc"] + + status [style = "filled,dashed", + shape = rect, + width = "3.2cm", + fillcolor = "#01012222", + color = grey40, + style = "filled,dotted,rounded", + label = "luaotfload-status.lua"] + + otfl_blacklist_cnf [style = "filled,dashed", + shape = rect, + width = "3.2cm", + fillcolor = "#01012222", + color = grey40, + style = "filled,dotted,rounded", + label = "luaotfload-blacklist.cnf"] + + luaotfload_libs [ + shape = box, + style = "filled,rounded", + color = "grey90:goldenrod4", + fontsize = 10, + label = < + <table cellborder="0" bgcolor="#FFFFFFAA"> + <th> <td colspan="2"> <font point-size="12" face="Iwona Italic">Luaotfload Libraries</font> </td> </th> + <tr> <td>luaotfload-auxiliary.lua</td> <td>luaotfload-features.lua</td> </tr> + <tr> <td>luaotfload-override.lua</td> <td>luaotfload-loaders.lua</td> </tr> + <tr> <td>luaotfload-log.lua</td> <td>luaotfload-letterspace.lua</td> </tr> + <tr> <td>luaotfload-parsers.lua</td> <td>luaotfload-database.lua</td> </tr> + <tr> <td>luaotfload-color.lua</td> </tr> + </table> + >, + ] + +/* ···································································· + * merged files + * ································································· */ + + subgraph cluster_merged { + node [style=filled, color=white]; + style = "filled,rounded"; + color = "grey90:dodgerblue4"; + //nodesep = "3.0"; + rank = same; + label = "Merged Libraries"; + gradientangle=0; + merged_lua_libs; + merged_luatex_fonts; + merged_context_libs; + } + + otfl_fonts_merged -> merged_lua_libs + otfl_fonts_merged -> merged_luatex_fonts + otfl_fonts_merged -> merged_context_libs + + merged_lua_libs [ + shape = box, + style = "filled,rounded", + color = "#FFFFFFAA", + fontsize = 10, + label = < + <table border="0"> + <th> <td colspan="3"> <font point-size="12" face="Iwona Italic">Lua Libraries from Context</font> </td> </th> + <tr> <td>l-lua.lua</td> <td>l-lpeg.lua</td> <td>l-function.lua</td> </tr> + <tr> <td>l-string.lua</td> <td>l-table.lua</td> <td>l-io.lua</td> </tr> + <tr> <td>l-file.lua</td> <td>l-boolean.lua</td> <td>l-math.lua</td> </tr> + <tr> <td>util-str.lua</td> </tr> + </table> + >, + ] + + merged_luatex_fonts [ + shape = box, + style = "filled,rounded", + color = "#FFFFFFAA", + fontsize = 10, + label = < + <table border="0"> + <th> <td colspan="2"> <font point-size="12" face="Iwona Italic">Font Loader (LuaTeX-Fonts)</font> </td> </th> + <tr> <td>luatex-basics-gen.lua</td> <td>luatex-basics-nod.lua</td> </tr> + <tr> <td>luatex-fonts-enc.lua</td> <td>luatex-fonts-syn.lua</td> </tr> + <tr> <td>luatex-font-tfm.lua</td> <td>luatex-font-afm.lua</td> </tr> + <tr> <td>luatex-font-afk.lua</td> <td>luatex-fonts-tfm.lua</td> </tr> + <tr> <td>luatex-fonts-chr.lua</td> <td>luatex-fonts-lua.lua</td> </tr> + <tr> <td>luatex-fonts-inj.lua</td> <td>luatex-fonts-otn.lua</td> </tr> + <tr> <td>luatex-fonts-def.lua</td> <td>luatex-fonts-ext.lua</td> </tr> + <tr> <td>luatex-fonts-cbk.lua</td> </tr> + + + + </table> + >, + ] + + merged_context_libs [ + shape = box, + style = "filled,rounded", + color = "#FFFFFFAA", + fontsize = 10, + label = < + <table border="0"> + <th> <td colspan="3"> <font point-size="12" face="Iwona Italic"> Font and Node Libraries from Context </font> </td> </th> + <tr> <td>data-con.lua</td> <td>font-ini.lua</td> <td>font-con.lua</td> </tr> + <tr> <td>font-cid.lua</td> <td>font-map.lua</td> <td>font-oti.lua</td> </tr> + <tr> <td>font-otf.lua</td> <td>font-otb.lua</td> <td>font-ota.lua</td> </tr> + <tr> <td>font-def.lua</td> </tr> + </table> + >, + ] +} + +// vim:ft=dot:sw=4:ts=4:expandtab diff --git a/doc/luaotfload-context.tex b/doc/luaotfload-context.tex new file mode 100644 index 0000000..6c8d4b2 --- /dev/null +++ b/doc/luaotfload-context.tex @@ -0,0 +1,485 @@ +% macros=mkvi +%% Copyright (C) 2009-2014 +%% +%% by Elie Roux <elie.roux@telecom-bretagne.eu> +%% and Khaled Hosny <khaledhosny@eglug.org> +%% and Philipp Gesang <philipp.gesang@alumni.uni-heidelberg.de> +%% +%% This file is part of Luaotfload. +%% +%% Home: https://github.com/lualatex/luaotfload +%% Support: <lualatex-dev@tug.org>. +%% +%% Luaotfload is under the GPL v2.0 (exactly) license. +%% +%% ---------------------------------------------------------------------------- +%% +%% Luaotfload is free software; you can redistribute it and/or +%% modify it under the terms of the GNU General Public License +%% as published by the Free Software Foundation; version 2 +%% of the License. +%% +%% Luaotfload is distributed in the hope that it will be useful, +%% but WITHOUT ANY WARRANTY; without even the implied warranty of +%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +%% GNU General Public License for more details. +%% +%% You should have received a copy of the GNU General Public License +%% along with Luaotfload; if not, see <http://www.gnu.org/licenses/>. +%% +%% ---------------------------------------------------------------------------- +%% + +\unprotect + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% layout and paper +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\setuppapersize [A5] [A5] %% 148×210 + +\definelayout [mainlayout] [ + backspace=15mm, %% 133 + textwidth=103mm, + topspace=15mm, +] + +\setuplayout [mainlayout] + +\setuppagenumbering [location=,alternative=doublesided] + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% colors +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\usecolors [x11] +\definecolor [primarycolor] [dodgerblue4] +\definecolor [secondarycolor] [goldenrod4] + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% interaction +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\setupinteraction [ + state=start, + page=no, + click=yes, + style=italic, + color=primarycolor, + contrastcolor=secondarycolor, + title={The Luaotfload package}, + subtitle={OpenType layout system for Plain TeX and LaTeX}, + author={Elie Roux & Khaled Hosny & Philipp Gesang}, + keywords={luatex, lualatex, unicode, opentype}, +] + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% fonts +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\usemodule [simplefonts] + +\definefontfeature [default] [default] [mode=base,liga=yes,dlig=yes,tlig=yes,onum=yes] +\definefontfeature [monospace] [liga=no,tlig=no,onum=no] + +\definefontfamily [mainface] [serif] [Linux Libertine O] [features=default] +%definefontfamily [mainface] [serif] [Liberation Serif] [feature=default] +%definefontfamily [mainface] [sans] [Iwona] [feature=default] +\definefontfamily [mainface] [sans] [Iwona Medium] [ + feature=default, + it=file:IwonaMedium-Italic.otf, + tf=file:IwonaMedium-Regular.otf, + bf=file:Iwona-Bold.otf, + bi=file:Iwona-BoldItalic.otf, +] +%definefontfamily [mainface] [sans] [DejaVu Sans] [feature=default] +\definefontfamily [mainface] [mono] [Liberation Mono] [scale=0.85,features=monospace] + +\setupbodyfont [mainface,10pt] + +\def \LUA {Lua} +\def \LUALATEX {Lua\LATEX} +\def \OpenType {\identifier{Open\kern-.25ex Type}} + +\definealternativestyle [emphasis:texmacro] [\ss \it \letterbackslash] [\ss \it \letterbackslash] +\definealternativestyle [emphasis:identifier] [\ss] [\ss] +\definealternativestyle [emphasis:normal] [\sl] [\sl] +\definealternativestyle [emphasis:abbrev] [{\feature [+][smallcaps]}] [{\feature [+][smallcaps]}] +\definealternativestyle [emphasis:Largefont] [{\switchtobodyfont[14pt]}] [{\switchtobodyfont[14pt]}] +\definealternativestyle [emphasis:smallcaps] [{\feature [+][smallcaps]}] [{\feature [+][smallcaps]}] +%definealternativestyle [emphasis:nonproportional] [\mono] [\mono] +\definealternativestyle [emphasis:nonproportional] [\tt] [\tt] +\definealternativestyle [head:section] [{\roman\feature[+][smallcaps]}] [{\roman\feature[+][smallcaps]}] +\definealternativestyle [head:subsection] [{\roman\feature[+][smallcaps]}] [{\roman\feature[+][smallcaps]}] +\definealternativestyle [head:subsubsection] [{\roman\feature[+][smallcaps]}] [{\roman\feature[+][smallcaps]}] +\definealternativestyle [typing:luafunction] [\italic] [\italic] +\definealternativestyle [typing:fileent] [\tt] [\tt] + +\definehighlight [texmacro] [style=emphasis:texmacro] %% cs +\definehighlight [identifier] [style=emphasis:identifier] %% names +\definehighlight [abbrev] [style=emphasis:abbrev] %% acronyms +\definehighlight [emphasis] [style=emphasis:normal] %% level 1 emph + +\definehighlight [Largefont] [style=emphasis:Largefont] %% font size +\definehighlight [smallcaps] [style=emphasis:smallcaps] %% font feature +\definehighlight [nonproportional] [style=emphasis:nonproportional] %% font switch + +\definetype [fileent] [style=typing:fileent] +\definetype [luafunction] [style=typing:luafunction] +\setuptyping [style=ttx] + +\definebodyfontenvironment [8pt] +\definebodyfontenvironment [10pt] +\definebodyfontenvironment [12pt] + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% headings +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\setuphead [section] [style=head:section, alternative=inmargin] +\setuphead [subsection] [style=head:subsection, alternative=inmargin] +\setuphead [subsubsection] [style=head:subsubsection,alternative=inmargin] + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% running headers +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\setupheadertexts + [{\tfx \getmarking[section]}] [pagenumber] + [pagenumber] [{\tfx \fileent{Luaotfload} Manual}] + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% structurals +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +%% section +\def \beginsection {\dosingleempty \section_begin_indeed} + +\def \section_begin_indeed [#ref]#title{% + \iffirstargument + \startsection [reference=#ref,title=#title]% + \else + \startsection [title=#title]% + \fi +} + +\let \endsection \stopsection + +%% subsection +\def \beginsubsection {\dosingleempty \section_begin_indeed} + +\def \subsection_begin_indeed [#ref]#title{% + \iffirstargument + \startsubsection [reference=#ref,title=#title]% + \else + \startsubsection [title=#title]% + \fi +} + +\let \endsubsection \stopsection + +%% subsubsection +\def \beginsubsubsection {\dosingleempty \section_begin_indeed} + +\def \subsubsection_begin_indeed [#ref]#title{% + \iffirstargument + \startsubsubsection [reference=#ref,title=#title]% + \else + \startsubsubsection [title=#title]% + \fi +} + +\let \endsubsubsection \stopsection + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% inline verbatim +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +%% Context offers both \type{…} and \type<<…>>, but not an unbalanced +%% one that we could map directly onto Latex’s \verb|…|. + +\definetype [inlinecode_indeed] [style=emphasis:nonproportional] + +%% The listings macros don’t seem to handle backslashes and braces +%% well. We emulate this behavior by handling the escaping in Lua. + +\startluacode + local lpeg = require "lpeg" + local Cs, P, S = lpeg.Cs, lpeg.P, lpeg.S + local lpegmatch = lpeg.match + local unescape_char = S[[\letterbackslash\letterleftbrace\letterrightbrace]] + local backslash = P[[\letterbackslash]] + local unescape = Cs (((backslash / "" * unescape_char) + 1)^0) + commands.unescape_things = function (str) + context.type (lpegmatch (unescape, str)) + end +\stopluacode + +\unexpanded \def \inlinecode #content{% + \ctxcommand {unescape_things \!!bs \detokenize {#content}\!!es}% +} + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% codelistings +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% Now *that’s* what I call easy. + +\unexpanded \def \beginlisting {% + \grabbufferdatadirect{listing}{beginlisting}{endlisting}% +} + +\unexpanded \def \endlisting {\typebuffer [listing]} + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% enumerations and lists +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\definedescription [descriptionitem] [ + align=right, + alternative=hanging, + width=2em, +] + +\def \begindescriptions {% + \begingroup + \def \beginnormalitem ##1\endnormalitem{% + \startitem##1\stopitem + } + \let \endnormalitem \relax + \let \beginaltitem \startdescriptionitem + \let \endaltitem \stopdescriptionitem +} + +\let \enddescriptions \endgroup + + +\definedescription [definitionitem] [ + align=right, + alternative=hanging, +] + +\def \begindefinitions {% + \begingroup + \def \beginnormalitem ##1\endnormalitem{% + \startitem##1\stopitem + } + \let \endnormalitem \relax + \let \beginaltitem \startdefinitionitem + \let \endaltitem \stopdefinitionitem +} + +\let \enddefinitions \endgroup + + +\definedescription [filelistitem] [ + align=normal, + alternative=hanging, + headstyle=typing:fileent, + width=4cm, +] + +\def \beginfilelist {% + \begingroup + \def \beginnormalitem ##1\endnormalitem{% + \startitem##1\stopitem + } + \let \endnormalitem \relax + \let \beginaltitem \startfilelistitem + \let \endaltitem \stopfilelistitem +} + +\let \endfilelist \endgroup + +\definedescription [functionlistitem] [ + align=normal, + alternative=hanging, + headstyle=typing:luafunction, + width=4cm, +] + +\def \beginfunctionlist {% + \begingroup + \def \beginnormalitem ##1\endnormalitem{% + \startitem##1\stopitem + } + \let \endnormalitem \relax + \let \beginaltitem \startfunctionlistitem + \let \endaltitem \stopfunctionlistitem +} + +\let \endfunctionlist \endgroup + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% columns +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\def \begindoublecolumns {\startcolumns [2]} +\let \enddoublecolumns \stopcolumns + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% alignment +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\setupnarrower [before={\blank[line]},after={\blank[line]}] +\let \beginnarrower \startnarrower +\let \endnarrower \stopnarrower + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% special elements +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\definefont [lmromantenregular] [file:lmroman10-regular.otf*default] + +\def \meta #1{% + {\lmromantenregular<}% + {\italic #1}% + {\lmromantenregular>}% +} + +\def \beginabstractcontent {% + \grabbufferdatadirect{abstractcontent}{beginabstractcontent}{endabstractcontent}% +} + +\let \endabstractcontent \relax + +\def \setdocumenttitle #1{\setvalue {document_title}{#1}} +\def \setdocumentdate #1{\setvalue {document_date}{#1}} +\def \setdocumentauthor #1{\setvalue {document_author}{#1}} + +\let \typesetdocumenttitle \relax +\let \beginfrontmatter \relax + +\def \endfrontmatter { + \startstandardmakeup + \vfill + \strut \hfill + \startframed [frame=off,align=middle,width=.5\textwidth] + \Largefont{\getvalue {document_title}} + \stopframed + \hfill \strut \par + + \blank [2*big] + + \strut \hfill + \startframed [frame=off,align=middle,width=.65\textwidth] + \setuplocalinterlinespace [18pt] + \getvalue {document_author} + \stopframed + \hfill \strut \par + + \vfill + \strut \hfill \getvalue {document_date} \hfill \strut + \blank [2*big] + + \strut \hfill + \startframed [width=.7\textwidth,align=normal,style=tfx,frame=off]% + \getbuffer [abstractcontent] + \stopframed + \hfill \strut + \stopstandardmakeup +} + +\let \typesetcontent \completecontent + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% floats +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% XXX we can improve on this part later + +\usemodule [vim] +\definevimtyping [bnf] [syntax=bnf] +\definefloat [syntax] [figure] + +\def \beginsyntaxfloat #reference#caption{% + \begingroup + \edef \currentreference {#reference}% + \edef \currentcaption {#caption}% + \grabbufferdatadirect{rawsyntaxdata}{beginsyntaxfloat}{endsyntaxfloat}% +} + +\def \endsyntaxfloat {% + \savebuffer [rawsyntaxdata] [rawsyntaxdata] + \startplacesyntax [ + reference=\currentreference, + title={\currentcaption}, + ] + %% there’s no \typebnfbuffer in t-vim :( + \typebnffile {\jobname-rawsyntaxdata.tmp} + \stopplacesyntax + \endgroup% +} + +\def \figurefloat #reference#caption#file{% + \startplacefigure [ + reference=#reference, + title={#caption}, + ] + \externalfigure [#file] [width=\textwidth] + \stopplacefigure +} + + +\def \tablefloat #reference#caption#content{% + \startplacetable [ + reference=#reference, + title={#caption}, + ] + #content + \stopplacetable +} + + +%% tables + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% tables +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\setupxtable [frame=off,option=stretch,textwidth=\dimexpr(\textwidth/2)] + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% hyperlinks and references +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\unexpanded \def \hyperlink{% + \dosingleempty \hyperlink_indeed% +} + +\def \hyperlink_indeed [#text]#url{% + \iffirstargument + \useURL [temporary_url] [#url] [] [#text]% + \else + \useURL [temporary_url] [#url]% + \fi% + \from [temporary_url]% +} + + +\def \email #1{\goto{#1}[url(mailto:#1)]} + +\def \label #tag{\reference [#tag]\empty} +\def \pageref #tag{\at{page}{#tag}} + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% escaped characters +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\let \charpercent \letterpercent +\let \charbackslash \letterbackslash +\let \chartilde \lettertilde + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% main +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\protect + +\newif \ifcontextmkiv \contextmkivtrue + +\starttext + \input luaotfload-main.tex +\stoptext + diff --git a/doc/luaotfload-latex.tex b/doc/luaotfload-latex.tex new file mode 100644 index 0000000..34c494d --- /dev/null +++ b/doc/luaotfload-latex.tex @@ -0,0 +1,448 @@ +\luatexsuppresslongerror1%% sigh ... +%% Copyright (C) 2009-2014 +%% +%% by Elie Roux <elie.roux@telecom-bretagne.eu> +%% and Khaled Hosny <khaledhosny@eglug.org> +%% and Philipp Gesang <philipp.gesang@alumni.uni-heidelberg.de> +%% +%% This file is part of Luaotfload. +%% +%% Home: https://github.com/lualatex/luaotfload +%% Support: <lualatex-dev@tug.org>. +%% +%% Luaotfload is under the GPL v2.0 (exactly) license. +%% +%% ---------------------------------------------------------------------------- +%% +%% Luaotfload is free software; you can redistribute it and/or +%% modify it under the terms of the GNU General Public License +%% as published by the Free Software Foundation; version 2 +%% of the License. +%% +%% Luaotfload is distributed in the hope that it will be useful, +%% but WITHOUT ANY WARRANTY; without even the implied warranty of +%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +%% GNU General Public License for more details. +%% +%% You should have received a copy of the GNU General Public License +%% along with Luaotfload; if not, see <http://www.gnu.org/licenses/>. +%% +%% ---------------------------------------------------------------------------- +%% + +\documentclass{ltxdoc} + +\makeatletter + +\usepackage {metalogo,multicol,fancyvrb,xspace} +\usepackage [x11names] {xcolor} + +\def \primarycolor {DodgerBlue4} %%-> rgb 16 78 139 | #104e8b +\def \secondarycolor {Goldenrod4} %%-> rgb 139 105 200 | #8b6914 + +\usepackage[ + bookmarks=true, + colorlinks=true, + linkcolor=\primarycolor, + urlcolor=\secondarycolor, + citecolor=\primarycolor, + pdftitle={The Luaotfload package}, + pdfsubject={OpenType layout system for Plain TeX and LaTeX}, + pdfauthor={Elie Roux & Khaled Hosny & Philipp Gesang}, + pdfkeywords={luatex, lualatex, unicode, opentype} +]{hyperref} + +\usepackage {fontspec} +\usepackage {unicode-math} + +\setmainfont[ +% Numbers = OldStyle, %% buggy with font cache + Ligatures = TeX, + BoldFont = {Linux Libertine O Bold}, + ItalicFont = {Linux Libertine O Italic}, + SlantedFont = {Linux Libertine O Italic}, +]{Linux Libertine O} +\setmonofont[Ligatures=TeX,Scale=MatchLowercase]{Liberation Mono} +%setsansfont[Ligatures=TeX]{Linux Biolinum O} +\setsansfont[Ligatures=TeX,Scale=MatchLowercase]{Iwona Medium} +%setmathfont{XITS Math} + +\usepackage{hologo} + +\newcommand\TEX {\TeX\xspace} +\newcommand\LUA {Lua\xspace} +\newcommand\PDFTEX {pdf\TeX\xspace} +\newcommand\LUATEX {Lua\TeX\xspace} +\newcommand\XETEX {\XeTeX\xspace} +\newcommand\LATEX {\LaTeX\xspace} +\newcommand\LUALATEX {Lua\LaTeX\xspace} +\newcommand\CONTEXT {Con\TeX t\xspace} +\newcommand\OpenType {\identifier{Open\kern-.25ex Type}\xspace} + +%% \groupedcommand, with some omissions taken from syst-aux.mkiv +\let \handlegroupnormalbefore \relax +\let \handlegroupnormalafter \relax + +\protected \def \handlegroupnormal #1#2{% + \bgroup % 1 + \def \handlegroupbefore {#1}% + \def \handlegroupafter {#2}% + \afterassignment \handlegroupnormalbefore + \let \next = +} + +\def \handlegroupnormalbefore {% + \bgroup % 2 + \handlegroupbefore + \bgroup % 3 + \aftergroup \handlegroupnormalafter% +} + +\def \handlegroupnormalafter {% + \handlegroupafter + \egroup % 3 + \egroup % 2 +} + +\let \groupedcommand \handlegroupnormal %% only the two arg version + +\def \definehighlight [#1][#2]{% + \ifcsname #1\endcsname\else + \expandafter\def\csname #1\endcsname{% + \leavevmode + \groupedcommand {#2}\empty% + } + \fi% +} + +%% old, simplistic definition: obsolete now that we have +%% \groupedcommand +%\def\definehighlight[#1][#2]% + %{\ifcsname #1\endcsname\else + %\expandafter\def\csname #1\endcsname% + %{\bgroup#2\csname #1_indeed\endcsname} + %\expandafter\def\csname #1_indeed\endcsname##1% + %{##1\egroup}% + %\fi} + +\def\restoreunderscore{\catcode`\_=12\relax} + +\definehighlight [fileent][\ttfamily\restoreunderscore] %% files, dirs +\definehighlight [texmacro][\sffamily\itshape\textbackslash] %% cs +\definehighlight [luafunction][\sffamily\itshape\restoreunderscore] %% lua identifiers +\definehighlight [identifier][\sffamily] %% names +\definehighlight [abbrev][\rmfamily\scshape] %% acronyms +\definehighlight [emphasis][\rmfamily\slshape] %% level 1 emph + +\definehighlight [Largefont][\Large] %% font size +\definehighlight [smallcaps][\sc] %% font feature +\definehighlight [nonproportional][\tt] %% font switch + +\newcommand*\email[1]{\href{mailto:#1}{#1}} + +\renewcommand\partname{Part}%% gets rid of the stupid “file” heading + +\usepackage{syntax}%% bnf for font request syntax + +\usepackage{titlesec} + +\def\movecountertomargin#1{\llap{\rmfamily\upshape#1\hskip2em}} +\def\zeropoint{0pt} +\titleformat \part + {\normalsize\rmfamily\bfseries} + {\movecountertomargin\thepart} \zeropoint {} +\titleformat \section + {\normalsize\rmfamily\scshape} + {\movecountertomargin\thesection} \zeropoint {} +\titleformat \subsection + {\small\rmfamily\itshape} + {\movecountertomargin\thesubsection} \zeropoint {} +\titleformat \subsubsection + {\normalsize\rmfamily\upshape} + {\movecountertomargin\thesubsubsection} \zeropoint {} + +\usepackage{tocloft} +\renewcommand \cftpartfont {\rmfamily\upshape} +\renewcommand \cftsecfont {\rmfamily\upshape} +\renewcommand \cftsubsecfont {\rmfamily\upshape} +\setlength \cftbeforepartskip {1ex} +\setlength \cftbeforesecskip {1ex} + +\VerbatimFootnotes + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% structurals +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\def \definestructural #1{% + \expandafter \let \csname end#1\endcsname \relax + + \expandafter \def \csname begin#1\endcsname {% + \@ifnextchar[{\csname begin#1indeed\endcsname} + {\csname begin#1indeed\endcsname[]}% + } + + \expandafter \def \csname begin#1indeed\endcsname [##1]##2{% + \edef \first {##1}% + \ifx \first \empty + \csname #1\endcsname [##2]{##2}% + \else + \csname #1\endcsname [\first]{##2}% + \fi + } +} + +\definestructural {section} +\definestructural {subsection} +\definestructural {subsubsection} + +\def \fakesection #1{\section*{#1}} + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% inline verbatim +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +%% Context offers both \type{…} and \type<<…>>, but not an unbalanced +%% one that we could map directly onto Latex’s \verb|…|. + +\usepackage {listings} +\lstset { + basicstyle=\ttfamily, +} + +%\let \inlinecode \lstinline +\protected \def \inlinecode {\lstinline} + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% codelistings; this sucks hard since we lack access to buffers +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\newcount \othercatcode \othercatcode 12 +\newcount \activecatcode \othercatcode 13 + +\newluatexcatcodetable \vrbcatcodes +\setluatexcatcodetable \vrbcatcodes {% + \luatexcatcodetable \CatcodeTableIniTeX + \catcode 9 \othercatcode %% \tabasciicode + \catcode 13 \othercatcode %% \endoflineasciicode + \catcode 12 \othercatcode %% \formfeedasciicode + \catcode 26 \othercatcode %% \endoffileasciicode + \catcode 32 \othercatcode %% \spaceasciicode +} + +\newluatexcatcodetable \literalcatcodes +\setluatexcatcodetable \literalcatcodes {% + \luatexcatcodetable \CatcodeTableString + \catcode 32 \activecatcode %% \spaceasciicode +} + +\def \beginlisting {% + \begingroup + \luatexcatcodetable \vrbcatcodes + \beginlistingindeed% +} + +\directlua { + local texprint = tex.print + local stringsub = string.sub + local backslash = string.byte (0x5c) + document = document or { } + document.printlines = function (buffer) + for _, line in next, string.explode (buffer, "\noexpand\n") do + if stringsub (line, 1, 1) == " " then + line = backslash .. line + end + texprint (-1, line) + texprint (-1, "") + end + end +} + +\def \beginlistingindeed#1\endlisting{% + \endgroup + \begingroup + \ttfamily + \small + \begin {quote} + \bgroup + \addfontfeature {RawFeature=-tlig;-liga}%% So one can’t just turn them all off at once using the ``Ligatures`` key? + \luatexcatcodetable \literalcatcodes + \obeyspaces + \obeylines + \directlua{document.printlines ([==[\detokenize {#1}]==])} + \egroup + \end {quote} + \endgroup +} + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% enumerations and lists +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\def \definelist [#1]#2{% name, itemcode + \expandafter \def \csname begin#1\endcsname {% + \begin {itemize} + \let \normalitem = \item + \def \altitem ####1{% + \def \first {####1}% + #2 + } + \let \beginnormalitem \item + \let \endnormalitem \relax + \let \beginaltitem \altitem + \let \endaltitem \relax + } + + \expandafter \def \csname end#1\endcsname {% + \end {itemize} + } +} + +\definelist [descriptions]{\normalitem {\textbf \first}\hfill\break} +\definelist [definitions]{\normalitem {\fileent {\first}}} +\definelist [filelist]{\normalitem {\fileent {\first}}\space--\hskip 1em} +\definelist [functionlist]{\normalitem {\luafunction {\first}}\hfill\break} + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% columns +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\def \begindoublecolumns {\begin {multicols} {2}} +\def \enddoublecolumns {\end {multicols}} + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% alignment +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\def \begincentered {\begin {center}} +\def \endcentered {\end {center}} + +\def \beginnarrower {\begin {quote}} +\def \endnarrower {\end {quote}} + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% special elements +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\let \beginfrontmatter \relax +\let \endfrontmatter \relax + +\def \beginabstractcontent {\begin {abstract}} +\def \endabstractcontent {\end {abstract}} + +\let \setdocumenttitle \title +\let \setdocumentdate \date +\let \setdocumentauthor \author +\let \typesetdocumenttitle \maketitle + +\AtBeginDocument {%% seriously? + \let \typesetcontent \tableofcontents% +} + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% floats +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +%% syntax definition +\def \beginsyntaxfloat #1#2{%% #1:label #2:caption + \begin {figure} [b] + \edef \syntaxlabel {#1}% + \def \syntaxcaption {#2}% + \setlength\grammarparsep{12pt plus 2pt minus 2pt}% + \setlength\grammarindent{5cm}% + \begingroup + \small + \begin {grammar} +} + +\def \endsyntaxfloat {% + \end {grammar} + \endgroup + \caption \syntaxcaption + \label \syntaxlabel + \end {figure} +} + +%% figures, e.g. the file graph +\def \figurefloat #1#2#3{%% #1:label #2:caption #3:file + \begin {figure} [b] + \caption {#2}% + \includegraphics[width=\textwidth]{#3}% + \label {#1} + \end {figure} +} + +%% tables +\def \tablefloat #1#2{%% #1:label #2:caption + \begin {table} [t] + \hrule + \caption {#2}% + \label {#1} + \hrule + \end {table} +} + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% hyperlinks +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\protected \def \hyperlink{% + \@ifnextchar[{\hyperlinkindeed}% + {\hyperlinkindeed[]}% +} + +\def \hyperlinkindeed [#1]#2{% + \def \first {#1}% + \ifx \first \empty + \url {#2}% + \else + \href {#2}{#1}% + \fi% +} + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% tables +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% Our tables aren’t anything special so we stick with “tabular” on the +%% Latex end. +%% +%% This is going to be largely incompatible with Context since format +%% specifications work quite differently (even between different +%% Context table variants). + +\def \begintabulate [#1]#2\endtabulate{% + \begingroup + \let \beginrow = \relax %% -> \NC in Context + \let \newcell = & %% -> \NC + \let \endrow = \cr %% -> \NC \NR + \begin {tabular}{#1}% + #2 + \end {tabular} + \endgroup +} + +\let \endtabulate \relax + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% escaped characters +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\let \charpercent \textpercent +\let \charbackslash \textbackslash +\let \chartilde \textasciitilde + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% main +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\makeatother + +\newif \ifcontextmkiv \contextmkivfalse + +\begin {document} + \input {luaotfload-main.tex} +\end {document} + + diff --git a/doc/luaotfload-main.tex b/doc/luaotfload-main.tex new file mode 100644 index 0000000..034b704 --- /dev/null +++ b/doc/luaotfload-main.tex @@ -0,0 +1,1591 @@ +%% Copyright (C) 2009-2014 +%% +%% by Elie Roux <elie.roux@telecom-bretagne.eu> +%% and Khaled Hosny <khaledhosny@eglug.org> +%% and Philipp Gesang <philipp.gesang@alumni.uni-heidelberg.de> +%% +%% This file is part of Luaotfload. +%% +%% Home: https://github.com/lualatex/luaotfload +%% Support: <lualatex-dev@tug.org>. +%% +%% Luaotfload is under the GPL v2.0 (exactly) license. +%% +%% ---------------------------------------------------------------------------- +%% +%% Luaotfload is free software; you can redistribute it and/or +%% modify it under the terms of the GNU General Public License +%% as published by the Free Software Foundation; version 2 +%% of the License. +%% +%% Luaotfload is distributed in the hope that it will be useful, +%% but WITHOUT ANY WARRANTY; without even the implied warranty of +%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +%% GNU General Public License for more details. +%% +%% You should have received a copy of the GNU General Public License +%% along with Luaotfload; if not, see <http://www.gnu.org/licenses/>. +%% +%% ---------------------------------------------------------------------------- +%% + +\beginfrontmatter + + \setdocumenttitle {The \identifier{luaotfload} package} + \setdocumentdate {2014/**/** v2.5} + \setdocumentauthor {Elie Roux · Khaled Hosny · Philipp Gesang\\ + Home: \hyperlink {https://github.com/lualatex/luaotfload}\\ + Support: \email {lualatex-dev@tug.org}} + + \typesetdocumenttitle + + \beginabstractcontent + This package is an adaptation of the \CONTEXT font loading system. + It allows for loading \OpenType fonts with an extended syntax and adds + support for a variety of font features. + \endabstractcontent + +\endfrontmatter + +\typesetcontent + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +\beginsection {Introduction} +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +Font management and installation has always been painful with \TEX. A +lot of files are needed for one font (\abbrev{tfm}, \abbrev{pfb}, +\abbrev{map}, \abbrev{fd}, \abbrev{vf}), and due to the 8-Bit encoding +each font is limited to 256 characters. + +But the font world has evolved since the original \TEX, and new +typographic systems have appeared, most notably the so called +\emphasis{smart font} technologies like \OpenType fonts (\abbrev{otf}). + +These fonts can contain many more characters than \TEX fonts, as well +as additional functionality like ligatures, old-style numbers, small +capitals, etc., and support more complex writing systems like Arabic +and Indic\footnote{% + Unfortunately, \identifier{luaotfload} doesn‘t support many Indic + scripts right now. + Assistance in implementing the prerequisites is greatly + appreciated. +} +scripts. + +\OpenType fonts are widely deployed and available for all modern +operating systems. + +As of 2013 they have become the de facto standard for advanced text +layout. + +However, until recently the only way to use them directly in the \TEX +world was with the \XETEX engine. + +Unlike \XETEX, \LUATEX has no built-in support for \OpenType or +technologies other than the original \TEX fonts. + +Instead, it provides hooks for executing \LUA code during the \TEX run +that allow implementing extensions for loading fonts and manipulating +how input text is processed without modifying the underlying engine. + +This is where \identifier{luaotfload} comes into play: +Based on code from \CONTEXT, it extends \LUATEX with functionality necessary +for handling \OpenType fonts. + +Additionally, it provides means for accessing fonts known to the operating +system conveniently by indexing the metadata. + +\endsection + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +\beginsection {Thanks} +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\identifier{Luaotfload} is part of \LUALATEX, the community-driven +project to provide a foundation for using the \LATEX format with the +full capabilites of the \LUATEX engine. +% +As such, the distinction between end users, contributors, and project +maintainers is intentionally kept less strict, lest we unduly +personalize the common effort. + +Nevertheless, the current maintainers would like to express their +gratitude to Khaled Hosny, Akira Kakuto, Hironori Kitagawa and Dohyun +Kim. +% +Their contributions -- be it patches, advice, or systematic +testing -- made the switch from version 1.x to 2.2 possible. +% +Also, Hans Hagen, the author of the font loader, made porting the +code to \LATEX a breeze due to the extra effort he invested into +isolating it from the rest of \CONTEXT, not to mention his assistance +in the task and willingness to respond to our suggestions. + +\endsection + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +\beginsection {Loading Fonts} +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\identifier{luaotfload} supports an extended font request syntax: + +\beginnarrower + \nonproportional{\string\font\string\foo\space= \string{}% + \meta{prefix}\nonproportional{:}% + \meta{font name}\nonproportional{:}% + \meta{font features}\nonproportional{\string}}% + \meta{\TEX font features} +\endnarrower + +\noindent +The curly brackets are optional and escape the spaces in the enclosed +font name. +% +Alternatively, double quotes serve the same purpose. +% +A selection of individual parts of the syntax are discussed below; +for a more formal description see figure \ref{font-syntax}. + +\beginsyntaxfloat + {font-syntax} + {Font request syntax. + Braces or double quotes around the + \emphasis{specification} rule will + preserve whitespace in file names. + In addition to the font style modifiers + (\emphasis{slash-notation}) given above, there + are others that are recognized but will be silently + ignored: \nonproportional{aat}, + \nonproportional{icu}, and + \nonproportional{gr}. + The special terminals are: + \smallcaps {feature\textunderscore id} for a valid font + feature name and + \smallcaps {feature\textunderscore value} for the corresponding + value. + \smallcaps {tfmname} is the name of a \abbrev{tfm} file. + \smallcaps {digit} again refers to bytes 48--57, and + \smallcaps {all\textunderscore characters} to all byte values. + \smallcaps {csname} and \smallcaps {dimension} are the \TEX concepts.} +% + <definition> ::= `\\font', {\sc csname}, `=', <font request>, [ <size> ] ; + + <size> ::= `at', {\sc dimension} ; + + <font request> ::= `"', <unquoted font request> `"' + \alt `{', <unquoted font request> `}' + \alt <unquoted font request> ; + + <unquoted font request> ::= <specification>, [`:', <feature list> ] + \alt `[', <path lookup> `]', [ [`:'], <feature list> ] ; + + <specification> ::= <prefixed spec>, [ <subfont no> ], \{ <modifier> \} + \alt <anon lookup>, \{ <modifier> \} ; + + <prefixed spec> ::= `file:', <file lookup> + \alt `name:', <name lookup> ; + + <file lookup> ::= \{ <name character> \} ; + + <name lookup> ::= \{ <name character> \} ; + + <anon lookup> ::= {\sc tfmname} | <name lookup> ; + + <path lookup> ::= \{ {\sc all_characters} - `]' \} ; + + <modifier> ::= `/', (`I' | `B' | `BI' | `IB' | `S=', \{ {\sc digit} \} ) ; + + <subfont no> ::= `(', \{ {\sc digit} \}, `)' ; + + <feature list> ::= <feature expr>, \{ `;', <feature expr> \} ; + + <feature expr> ::= {\sc feature_id}, `=', {\sc feature_value} + \alt <feature switch>, {\sc feature_id} ; + + <feature switch> ::= `+' | `-' ; + + <name character> ::= {\sc all_characters} - ( `(' | `/' | `:' ) ; +\endsyntaxfloat + +\beginsubsection{Prefix -- the \identifier{luaotfload}{ }Way} + +In \identifier{luaotfload}, the canonical syntax for font requests +requires a \emphasis{prefix}: +% +\beginnarrower + \nonproportional{\string\font\string\fontname\space= }% + \meta{prefix}% + \nonproportional{:}% + \meta{fontname}% + \dots +\endnarrower +% +where \meta{prefix} is either \inlinecode{file:} or \inlinecode {name:}.\footnote{% + The development version also knows two further prefixes, + \inlinecode {kpse:} and \inlinecode {my:}. + % + A \inlinecode {kpse} lookup is restricted to files that can be found by + \identifier{kpathsea} and + will not attempt to locate system fonts. + % + This behavior can be of value when an extra degree of encapsulation is + needed, for instance when supplying a customized tex distribution. + + The \inlinecode {my} lookup takes this a step further: it lets you define + a custom resolver function and hook it into the \luafunction{resolve_font} + callback. + % + This ensures full control over how a file is located. + % + For a working example see the + \hyperlink [test repo]{https://bitbucket.org/phg/lua-la-tex-tests/src/5f6a535d/pln-lookup-callback-1.tex}. +} +% +It determines whether the font loader should interpret the request as +a \emphasis{file name} or + \emphasis{font name}, respectively, +which again influences how it will attempt to locate the font. +% +Examples for font names are + “Latin Modern Italic”, + “GFS Bodoni Rg”, and + “PT Serif Caption” +-- they are the human readable identifiers +usually listed in drop-down menus and the like.\footnote{% + Font names may appear like a great choice at first because they + offer seemingly more intuitive identifiers in comparison to arguably + cryptic file names: + % + “PT Sans Bold” is a lot more descriptive than \fileent{PTS75F.ttf}. + On the other hand, font names are quite arbitrary and there is no + universal method to determine their meaning. + % + While \identifier{luaotfload} provides fairly sophisticated heuristic + to figure out a matching font style, weight, and optical size, it + cannot be relied upon to work satisfactorily for all font files. + % + For an in-depth analysis of the situation and how broken font names + are, please refer to + \hyperlink [this post]{http://www.ntg.nl/pipermail/ntg-context/2013/073889.html} + by Hans Hagen, the author of the font loader. + % + If in doubt, use filenames. + % + \fileent{luaotfload-tool} can perform the matching for you with the + option \inlinecode {--find=<name>}, and you can use the file name it returns + in your font definition. +} +% +In order for fonts installed both in system locations and in your +\fileent{texmf} to be accessible by font name, \identifier{luaotfload} must +first collect the metadata included in the files. +% +Please refer to section~\ref{sec:fontdb} below for instructions on how to +create the database. + +File names are whatever your file system allows them to be, except +that that they may not contain the characters + \inlinecode {(}, + \inlinecode {:}, and + \inlinecode {/}. +% +As is obvious from the last exception, the \inlinecode {file:} lookup will +not process paths to the font location -- only those +files found when generating the database are addressable this way. +% +Continue below in the \XETEX section if you need to load your fonts +by path. +% +The file names corresponding to the example font names above are + \fileent{lmroman12-italic.otf}, + \fileent{GFSBodoni.otf}, and + \fileent{PTZ56F.ttf}. + +\endsubsection + +\beginsubsection {Compatibility Layer} + +In addition to the regular prefixed requests, \identifier{luaotfload} +accepts loading fonts the \XETEX way. +% +There are again two modes: bracketed and unbracketed. +A bracketed request looks as follows. + +\beginnarrower + \nonproportional{\string\font\string\fontname\space = [}% + \meta{/path/to/file}% + \nonproportional{]} +\endnarrower + +\noindent +Inside the square brackets, every character except for a closing +bracket is permitted, allowing for specifying paths to a font file. +% +Naturally, path-less file names are equally valid and processed the +same way as an ordinary \inlinecode {file:} lookup. + +\beginnarrower + \nonproportional{\string\font\string\fontname\space= }% + \meta{font name} + \dots +\endnarrower + +Unbracketed (or, for lack of a better word: \emphasis{anonymous}) +font requests resemble the conventional \TEX syntax. +% +However, they have a broader spectrum of possible interpretations: +before anything else, \identifier{luaotfload} attempts to load a +traditional \TEX Font Metric (\abbrev{tfm} or \abbrev{ofm}). +% +If this fails, it performs a \inlinecode {name:} lookup, which itself will +fall back to a \inlinecode {file:} lookup if no database entry matches +\meta{font name}. + +Furthermore, \identifier{luaotfload} supports the slashed (shorthand) +font style notation from \XETEX. + +\beginnarrower + \nonproportional{\string\font\string\fontname\space= }% + \meta{font name}% + \nonproportional{/}% + \meta{modifier} + \dots +\endnarrower + +\noindent +Currently, four style modifiers are supported: + \inlinecode {I} for italic shape, + \inlinecode {B} for bold weight, + \inlinecode {BI} or \inlinecode {IB} for the combination of both. +% +Other “slashed” modifiers are too specific to the \XETEX engine and +have no meaning in \LUATEX. + +\endsubsection + +\beginsubsection{Examples} + +\beginsubsubsection{Loading by File Name} + +For example, conventional \abbrev{type1} font can be loaded with a +\inlinecode {file:} request like so: + +\beginlisting + \font \lmromanten = {file:ec-lmr10} at 10pt +\endlisting + +The \OpenType version of Janusz Nowacki’s font \emphasis{Antykwa +Półtawskiego}\footnote{% + \hyperlink {http://jmn.pl/antykwa-poltawskiego/}, also available in + in \TEX Live. +} +in its condensed variant can be loaded as follows: + +\beginlisting + \font \apcregular = file:antpoltltcond-regular.otf at 42pt +\endlisting + +The next example shows how to load the \emphasis{Porson} font digitized by +the Greek Font Society using \XETEX-style syntax and an absolute path from a +non-standard directory: + +\beginlisting + \font \gfsporson = "[/tmp/GFSPorson.otf]" at 12pt +\endlisting + +\endsubsubsection + +\beginsubsubsection{Loading by Font Name} + +The \inlinecode {name:} lookup does not depend on cryptic filenames: + +\beginlisting + \font \pagellaregular = {name:TeX Gyre Pagella} at 9pt +\endlisting + +A bit more specific but essentially the same lookup would be: + +\beginlisting + \font \pagellaregular = {name:TeX Gyre Pagella Regular} at 9pt +\endlisting + +\noindent +Which fits nicely with the whole set: + +\beginlisting + \font\pagellaregular = {name:TeX Gyre Pagella Regular} at 9pt + \font\pagellaitalic = {name:TeX Gyre Pagella Italic} at 9pt + \font\pagellabold = {name:TeX Gyre Pagella Bold} at 9pt + \font\pagellabolditalic = {name:TeX Gyre Pagella Bolditalic} at 9pt + + {\pagellaregular foo bar baz\endgraf} + {\pagellaitalic foo bar baz\endgraf} + {\pagellabold foo bar baz\endgraf} + {\pagellabolditalic foo bar baz\endgraf} + + ... +\endlisting + +\endsubsubsection + +\beginsubsubsection{Modifiers} + +If the entire \emphasis{Iwona} family\footnote{% + \hyperlink {http://jmn.pl/kurier-i-iwona/}, + also in \TEX Live. +} +is installed in some location accessible by \identifier{luaotfload}, +the regular shape can be loaded as follows: + +\beginlisting + \font \iwona = Iwona at 20pt +\endlisting + +\noindent +To load the most common of the other styles, the slash notation can +be employed as shorthand: + +\beginlisting + \font \iwonaitalic = Iwona/I at 20pt + \font \iwonabold = Iwona/B at 20pt + \font \iwonabolditalic = Iwona/BI at 20pt +\endlisting + +\noindent +which is equivalent to these full names: + +\beginlisting + \font \iwonaitalic = "Iwona Italic" at 20pt + \font \iwonabold = "Iwona Bold" at 20pt + \font \iwonabolditalic = "Iwona BoldItalic" at 20pt +\endlisting + +\endsubsubsection +\endsubsection +\endsection + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +\beginsection {Font features} +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\emphasis{Font features} are the second to last component in the +general scheme for font requests: + +\beginnarrower + \nonproportional{\string\font\string\foo\space= "}% + \meta{prefix}% + \nonproportional{:}% + \meta{font name}% + \nonproportional{:}% + \meta{font features}% + \meta{\TEX font features}% + \nonproportional{"} +\endnarrower + +\noindent +If style modifiers are present (\XETEX style), they must precede +\meta{font features}. + +The element \meta{font features} is a semicolon-separated list of feature +tags\footnote{% + Cf. \hyperlink {http://www.microsoft.com/typography/otspec/featurelist.htm}. +} +and font options. +% +Prepending a font feature with a \inlinecode{+} (plus sign) enables it, +whereas a \inlinecode{-} (minus) disables it. For instance, the request + +\beginlisting + \font \test = LatinModernRoman:+clig;-kern +\endlisting + +\noindent activates contextual ligatures (\inlinecode{clig}) and +disables kerning (\inlinecode{kern}). +% +Alternatively the options \inlinecode{true} or \inlinecode{false} can +be passed to the feature in a key/value expression. +% +The following request has the same meaning as the last one: + +\beginlisting + \font \test = LatinModernRoman:clig=true;kern=false +\endlisting + +\noindent +Furthermore, this second syntax is required should a font feature +accept other options besides a true/false switch. +% +For example, \emphasis{stylistic alternates} (\inlinecode{salt}) are +variants of given glyphs. +% +They can be selected either explicitly by supplying the variant +index (starting from one), or randomly by setting the value to, +obviously, \inlinecode{random}. + +%% TODO verify that this actually works with a font that supports +%% the salt/random feature!\fi +\beginlisting + \font \librmsaltfirst = LatinModernRoman:salt=1 +\endlisting + +\beginsubsection {Basic font features} + +\begindescriptions + + \beginaltitem {mode} + \identifier{luaotfload} has two \OpenType processing + \emphasis{modes}: + \identifier{base} and \identifier{node}. + + \identifier{base} mode works by mapping \OpenType + features to traditional \TEX ligature and kerning mechanisms. + % + Supporting only non-contextual substitutions and kerning + pairs, it is the slightly faster, albeit somewhat limited, variant. + % + \identifier{node} mode works by processing \TeX’s internal + node list directly at the \LUA end and supports + a wider range of \OpenType features. + % + The downside is that the intricate operations required for + \identifier{node} mode may slow down typesetting especially + with complex fonts and it does not work in math mode. + + By default \identifier{luaotfload} is in \identifier{node} + mode, and \identifier{base} mode has to be requested where needed, + e.~g. for math fonts. + \endaltitem + + \beginaltitem {script} \label{script-tag} + An \OpenType script tag;\footnote{% + See \hyperlink {http://www.microsoft.com/typography/otspec/scripttags.htm} + for a list of valid values. + % + For scripts derived from the Latin alphabet the value + \inlinecode{latn} is good choice. + } + the default value is \inlinecode{dlft}. + % + Some fonts, including very popular ones by foundries like Adobe, + do not assign features to the \inlinecode{dflt} script, in + which case the script needs to be set explicitly. + \endaltitem + + \beginaltitem {language} + An \OpenType language system identifier,\footnote{% + Cf. \hyperlink {http://www.microsoft.com/typography/otspec/languagetags.htm}. + } + defaulting to \inlinecode{dflt}. + \endaltitem + + \beginaltitem {featurefile} + A comma-separated list of feature files to be applied to the + font. + % + Feature files contain a textual representation of + \OpenType tables and extend the features of a font + on fly. + % + After they are applied to a font, features defined in a + feature file can be enabled or disabled just like any + other font feature. + % + The syntax is documented in \identifier{Adobe}’s + \OpenType Feature File Specification.\footnote{% + Cf. \hyperlink {http://www.adobe.com/devnet/opentype/afdko/topic_feature_file_syntax.html}. + Feature file support is part of the engine which at the + time of this writing (2014) implements the spec only + partially. + See the + \hyperlink [\LUATEX tracker]{http://tracker.luatex.org/view.php?id=231} + for details. + } + + For a demonstration of how to set a \inlinecode{tkrn} feature consult + the file \inlinecode{tkrn.fea} that is part of \identifier{luaotfload}. + It can be read and applied as follows: + + \inlinecode{\\font \\test = Latin Modern Roman:featurefile=tkrn.fea;+tkrn} + \endaltitem + + \beginaltitem {color} + A font color, defined as a triplet of two-digit hexadecimal + \abbrev{rgb} values, with an optional fourth value for + transparency + (where \inlinecode{00} is completely transparent and + \inlinecode{FF} is opaque). + + For example, in order to set text in semitransparent red: + + \beginlisting +\font \test = "Latin Modern Roman:color=FF0000BB" + \endlisting + \endaltitem + + \beginaltitem {kernfactor \& letterspace} + Define a font with letterspacing (tracking) enabled. + % + In \identifier{luaotfload}, letterspacing is implemented by + inserting additional kerning between glyphs. + + This approach is derived from and still quite similar to the + \emphasis{character kerning} (\texmacro{setcharacterkerning} / + \texmacro{definecharacterkerning} \& al.) functionality of + Context, see the file \fileent{typo-krn.lua} there. + % + The main difference is that \identifier{luaotfload} does not + use \LUATEX attributes to assign letterspacing to regions, + but defines virtual letterspaced versions of a font. + + The option \identifier{kernfactor} accepts a numeric value that + determines the letterspacing factor to be applied to the font + size. + % + E.~g. a kern factor of $0.42$ applied to a $10$ pt font + results in $4.2$ pt of additional kerning applied to each + pair of glyphs. + % + Ligatures are split into their component glyphs unless + explicitly ignored (see below). + + For compatibility with \XETEX an alternative + \identifier{letterspace} option is supplied that interprets the + supplied value as a \emphasis{percentage} of the font size but + is otherwise identical to \identifier{kernfactor}. + % + Consequently, both definitions in below snippet yield the same + letterspacing width: + + \beginlisting +\font \iwonakernedA = "file:Iwona-Regular.otf:kernfactor=0.125" +\font \iwonakernedB = "file:Iwona-Regular.otf:letterspace=12.5" + \endlisting + + Specific pairs of letters and ligatures may be exempt from + letterspacing by defining the \LUA functions + \luafunction{keeptogether} and \luafunction{keepligature}, + respectively, inside the namespace \inlinecode {luaotfload.letterspace}. + % + Both functions are called whenever the letterspacing callback + encounters an appropriate node or set of nodes. + % + If they return a true-ish value, no extra kern is inserted at + the current position. + % + \luafunction{keeptogether} receives a pair of consecutive + glyph nodes in order of their appearance in the node list. + % + \luafunction{keepligature} receives a single node which can be + analyzed into components. + % + (For details refer to the \emphasis{glyph nodes} section in the + \LUATEX reference manual.) + % + The implementation of both functions is left entirely to the + user. + \endaltitem + +\ifcontextmkiv + \startbuffer [printvectors] + \directlua{inspect(fonts.protrusions.setups.default) + inspect(fonts.expansions.setups.default)} + \stopbuffer +\fi + + \beginaltitem {protrusion \& expansion} + These keys control microtypographic features of the font, + namely \emphasis{character protrusion} and \emphasis{font + expansion}. + % + Their arguments are names of \LUA tables that contain + values for the respective features.\footnote{% + For examples of the table layout please refer to the + section of the file \fileent{luaotfload-fonts-ext.lua} where the + default values are defined. + % + Alternatively and with loss of information, you can dump + those tables into your terminal by issuing + \unless \ifcontextmkiv + \beginlisting + \directlua{inspect(fonts.protrusions.setups.default) + inspect(fonts.expansions.setups.default)} + \endlisting + \else + \typebuffer [printvectors] + \fi + at some point after loading \fileent{luaotfload.sty}. + } + % + For both, only the set \identifier{default} is predefined. + + For example, to define a font with the default + protrusion vector applied\footnote{% + You also need to set + \inlinecode {pdfprotrudechars=2} and + \inlinecode {pdfadjustspacing=2} + to activate protrusion and expansion, respectively. + See the + \hyperlink [\PDFTEX manual]{http://mirrors.ctan.org/systems/pdftex/manual/pdftex-a.pdf}% + for details. + }: + + \beginlisting +\font \test = LatinModernRoman:protrusion=default + \endlisting + \endaltitem +\enddescriptions + +\endsubsection + +\beginsubsection {Non-standard font features} +\identifier{luaotfload} adds a number of features that are not defined +in the original \OpenType specification, most of them +aiming at emulating the behavior familiar from other \TEX engines. +% +Currently (2014) there are three of them: + +\begindescriptions + + \beginaltitem {anum} + Substitutes the glyphs in the \abbrev{ascii} number range + with their counterparts from eastern Arabic or Persian, + depending on the value of \identifier{language}. + \endaltitem + + \beginaltitem {tlig} + Applies legacy \TEX ligatures\footnote{% + These contain the feature set \inlinecode {trep} of earlier + versions of \identifier{luaotfload}. + + Note to \XETEX users: this is the equivalent of the + assignment \inlinecode {mapping=text-tex} using \XETEX's input + remapping feature. + }: + + \unless \ifcontextmkiv + %% Using braced arg syntax with inline code appears to be + %% impossible within Latex tables -- just ignore the weird + %% exclamation points below. + \begintabulate [rlrl] + \beginrow `` \newcell {\inlinecode !``! } \newcell '' \newcell {\inlinecode !''!} \endrow + \beginrow ` \newcell {\inlinecode !`! } \newcell ' \newcell {\inlinecode !'! } \endrow + \beginrow " \newcell {\inlinecode !"! } \newcell -- \newcell {\inlinecode !--!} \endrow + \beginrow --- \newcell {\inlinecode !---!} \newcell !` \newcell {\inlinecode ?!`?} \endrow + \beginrow ?` \newcell {\inlinecode !?`! } \newcell \newcell \endrow + \endtabulate + \else + %% XXX find a way to wrap these in the tabulate environment + \startframed [frame=off,width=broad,align=middle] + \startframed [frame=off,width=\dimexpr(\textwidth/2)] + \startxtable [align=middle] + \startxrow \startxcell `` \stopxcell \startxcell \inlinecode {``} \stopxcell \startxcell '' \stopxcell \startxcell \inlinecode {''} \stopxcell \stopxrow + \startxrow \startxcell ` \stopxcell \startxcell \inlinecode {`} \stopxcell \startxcell ' \stopxcell \startxcell \inlinecode {'} \stopxcell \stopxrow + \startxrow \startxcell " \stopxcell \startxcell \inlinecode {"} \stopxcell \startxcell -- \stopxcell \startxcell \inlinecode {--} \stopxcell \stopxrow + \startxrow \startxcell --- \stopxcell \startxcell \inlinecode {---} \stopxcell \startxcell !` \stopxcell \startxcell \inlinecode {!`} \stopxcell \stopxrow + \startxrow \startxcell ?` \stopxcell \startxcell \inlinecode {?`} \stopxcell \startxcell \stopxcell \startxcell \stopxcell \stopxrow + \stopxtable + \stopframed + \stopframed + \fi + \endaltitem + + \beginaltitem {itlc} + Computes italic correction values (active by default). + \endaltitem + +\enddescriptions + +\endsubsection +\endsection + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +\beginsection {Font names database} +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\label{sec:fontdb} + +As mentioned above, \identifier{luaotfload} keeps track of which +fonts are available to \LUATEX by means of a \emphasis{database}. +% +This allows referring to fonts not only by explicit filenames but +also by the proper names contained in the metadata which is often +more accessible to humans.\footnote{% + The tool \hyperlink[\fileent{otfinfo}]{http://www.lcdf.org/type/} + (comes with \TEX Live), when invoked on a font file with the + \inlinecode {-i} option, lists the variety of name fields defined for + it. +} + +When \identifier{luaotfload} is asked to load a font by a font name, +it will check if the database exists and load it, or else generate a +fresh one. +% +Should it then fail to locate the font, an update to the database is +performed in case the font has been added to the system only +recently. +% +As soon as the database is updated, the resolver will try +and look up the font again, all without user intervention. +% +The goal is for \identifier{luaotfload} to act in the background and +behave as unobtrusively as possible, while providing a convenient +interface to the fonts installed on the system. + +Generating the database for the first time may take a while since it +inspects every font file on your computer. +% +This is particularly noticeable if it occurs during a typesetting run. +In any case, subsequent updates to the database will be quite fast. + +\beginsubsection[luaotfload-tool] + {\fileent{luaotfload-tool}} + +It can still be desirable at times to do some of these steps +manually, and without having to compile a document. +% +To this end, \identifier{luaotfload} comes with the utility +\fileent{luaotfload-tool} that offers an interface to the database +functionality. +% +Being a \LUA script, there are two ways to run it: +either make it executable (\inlinecode {chmod +x} on unixoid systems) or +pass it as an argument to \fileent{texlua}.\footnote{% + Tests by the maintainer show only marginal performance gain by + running with Luigi Scarso’s + \hyperlink [\identifier{Luajit\kern-.25ex\TEX}]{https://foundry.supelec.fr/projects/luajittex/}, + which is probably due to the fact that most of the time is spent + on file system operations. + + \emphasis{Note}: + On \abbrev{MS} \identifier{Windows} systems, the script can be run + either by calling the wrapper application + \fileent{luaotfload-tool.exe} or as + \inlinecode {texlua.exe luaotfload-tool.lua}. +} +% +Invoked with the argument \inlinecode {--update} it will perform a database +update, scanning for fonts not indexed. + +\beginlisting + luaotfload-tool --update +\endlisting + +Adding the \inlinecode {--force} switch will initiate a complete +rebuild of the database. + +\beginlisting + luaotfload-tool --update --force +\endlisting + +\endsubsection + +\beginsubsection{Search Paths} + +\identifier{luaotfload} scans those directories where fonts are +expected to be located on a given system. +% +On a Linux machine it follows the paths listed in the +\identifier{Fontconfig} configuration files; +consult \inlinecode {man 5 fonts.conf} for further information. +% +On \identifier{Windows} systems, the standard location is +\inlinecode {Windows\\Fonts}, +% +while \identifier{Mac OS~X} requires a multitude of paths to +be examined. +% +The complete list is is given in table \ref{table-searchpaths}. +Other paths can be specified by setting the environment variable +\inlinecode {OSFONTDIR}. +% +If it is non-empty, then search will be extended to the included +directories. + +\tablefloat {table-searchpaths} + {List of paths searched for each supported operating system.} + {% + \unless \ifcontextmkiv + \begincentered + \begintabulate [lp{.5\textwidth}] + \beginrow + Windows \newcell \inlinecode !\% WINDIR\%\\ Fonts! + \endrow + \beginrow + Linux \newcell \fileent{/usr/local/etc/fonts/fonts.conf} and\hfill\break + \fileent{/etc/fonts/fonts.conf} + \endrow + \beginrow + Mac \newcell \fileent{\textasciitilde/Library/Fonts},\break + \fileent{/Library/Fonts},\break + \fileent{/System/Library/Fonts}, and\hfill\break + \fileent{/Network/Library/Fonts} + \endrow + \endtabulate + \endcentered + \else + \setuplocalinterlinespace [14pt] + \starttabulate [|l|p(.5\textwidth)|] + \NC Windows \NC \inlinecode {\% WINDIR\%\\ Fonts} \NC \NR + \NC Linux \NC \fileent{/usr/local/etc/fonts/fonts.conf} and\crlf + \fileent{/etc/fonts/fonts.conf} \NC \NR + \NC + Mac \NC \fileent{\textasciitilde/Library/Fonts},\crlf + \fileent{/Library/Fonts},\break + \fileent{/System/Library/Fonts}, and\crlf + \fileent{/Network/Library/Fonts} \NC \NR + \stoptabulate + \fi% + } + +\endsubsection + +\beginsubsection{Querying from Outside} + +\fileent{luaotfload-tool} also provides rudimentary means of +accessing the information collected in the font database. +% +If the option \inlinecode {--find=}\emphasis{name} is given, the script will +try and search the fonts indexed by \identifier{luaotfload} for a +matching name. +% +For instance, the invocation + +\beginlisting + luaotfload-tool --find="Iwona Regular" +\endlisting + +\noindent +will verify if “Iwona Regular” is found in the database and can be +readily requested in a document. + +If you are unsure about the actual font name, then add the +\inlinecode {-F} (or \inlinecode {--fuzzy}) switch to the command line to enable +approximate matching. +% +Suppose you cannot precisely remember if the variant of +\identifier{Iwona} you are looking for was “Bright” or “Light”. +The query + +\beginlisting + luaotfload-tool -F --find="Iwona Bright" +\endlisting + +\noindent +will tell you that indeed the latter name is correct. + +Basic information about fonts in the database can be displayed +using the \inlinecode {-i} option (\inlinecode {--info}). +% +\beginlisting + luaotfload-tool -i --find="Iwona Light Italic" +\endlisting +% +\noindent +The meaning of the printed values is described in section 4.4 of the +\LUATEX reference manual.\footnote{% + In \TEX Live: \fileent{texmf-dist/doc/luatex/base/luatexref-t.pdf}. +} + +For a much more detailed report about a given font try the +\inlinecode {-I} option instead (\inlinecode {--inspect}). +\beginlisting + luaotfload-tool -I --find="Iwona Light Italic" +\endlisting + +\inlinecode {luaotfload-tool --help} will list the available command line +switches, including some not discussed in detail here. +% +For a full documentation of \identifier{luaotfload-tool} and its +capabilities refer to the manpage +(\inlinecode {man 1 luaotfload-tool}).\footnote{% + Or see \inlinecode {luaotfload-tool.rst} in the source directory. +} + +\endsubsection + +\beginsubsection {Blacklisting Fonts} +\label{font-blacklist} + +Some fonts are problematic in general, or just in \LUATEX. +% +If you find that compiling your document takes far too long or eats +away all your system’s memory, you can track down the culprit by +running \inlinecode {luaotfload-tool -v} to increase verbosity. +% +Take a note of the \emphasis{filename} of the font that database +creation fails with and append it to the file +\fileent{luaotfload-blacklist.cnf}. + +A blacklist file is a list of font filenames, one per line. +Specifying the full path to where the file is located is optional, the +plain filename should suffice. +% +File extensions (\fileent{.otf}, \fileent{.ttf}, etc.) may be omitted. +% +Anything after a percent (\inlinecode {\%}) character until the end of the line +is ignored, so use this to add comments. +% +Place this file to some location where the \identifier{kpse} +library can find it, e.~g. +\fileent{texmf-local/tex/luatex/luaotfload} if you are running +\identifier{\TEX Live},\footnote{% + You may have to run \inlinecode {mktexlsr} if you created a new file in + your \fileent{texmf} tree. +} +or just leave it in the working directory of your document. +% +\identifier{luaotfload} reads all files named +\fileent{luaotfload-blacklist.cnf} it finds, so the fonts in +\fileent{./luaotfload-blacklist.cnf} extend the global blacklist. + +Furthermore, a filename prepended with a dash character (\inlinecode{-}) is +removed from the blacklist, causing it to be temporarily whitelisted +without modifying the global file. +% +An example with explicit paths: + +\beginlisting +% example otf-blacklist.cnf +/Library/Fonts/GillSans.ttc % Luaotfload ignores this font. +-/Library/Fonts/Optima.ttc % This one is usable again, even if + % blacklisted somewhere else. +\endlisting + +\endsubsection +\endsection + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +\beginsection {Files from \CONTEXT and \LUATEX-Fonts} +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\identifier{luaotfload} relies on code originally written by Hans +Hagen for the \hyperlink[\identifier{\CONTEXT}]{http://wiki.contextgarden.net} +format. +% +It integrates the font loader as distributed in +the \identifier{\LUATEX-Fonts} package. +% +The original \LUA source files have been combined using the +\fileent{mtx-package} script into a single, self-contained blob. +In this form the font loader has no further dependencies\footnote{% + It covers, however, to some extent the functionality of the + \identifier{lualibs} package. +} +and requires only minor adaptions to integrate into +\identifier{luaotfload}. +% +The guiding principle is to let \CONTEXT/\LUATEX-Fonts take care of +the implementation, and update the imported code from time to time. +% +As maintainers, we aim at importing files from upstream essentially +\emphasis{unmodified}, except for renaming them to prevent name +clashes. +% +This job has been greatly alleviated since the advent of +\LUATEX-Fonts, prior to which the individual dependencies had to be +manually spotted and extracted from the \CONTEXT source code in a +complicated and error-prone fashion. + +Below is a commented list of the files distributed with +\identifier{luaotfload} in one way or the other. +% +See figure \ref{file-graph} on page \pageref{file-graph} for a +graphical representation of the dependencies. +% +From \LUATEX-Fonts, only the file \fileent{luatex-fonts-merged.lua} +has been imported as \fileent{luaotfload-fontloader.lua}. +% +It is generated by \fileent{mtx-package}, a \LUA source code merging +too developed by Hans Hagen.\footnote{% + \fileent{mtx-package} is + \hyperlink [part of \CONTEXT]{http://repo.or.cz/w/context.git/blob_plain/refs/heads/origin:/scripts/context/lua/mtx-package.lua} + and requires \fileent{mtxrun}. + Run + \inlinecode {mtxrun --script package --help} + to display further information. + For the actual merging code see the file + \fileent{util-mrg.lua} that is part of \CONTEXT. +} +It houses several \LUA files that can be classed in three +categories. + +\begindefinitions + \beginnormalitem + \emphasis{\LUA utility libraries}, a subset + of what is provided by the \identifier{lualibs} + package. + + \begindoublecolumns + \begindefinitions + \beginaltitem {l-lua.lua} \endaltitem + \beginaltitem {l-lpeg.lua} \endaltitem + \beginaltitem {l-function.lua} \endaltitem + \beginaltitem {l-string.lua} \endaltitem + \beginaltitem {l-table.lua} \endaltitem + \beginaltitem {l-io.lua} \endaltitem + \beginaltitem {l-file.lua} \endaltitem + \beginaltitem {l-boolean.lua} \endaltitem + \beginaltitem {l-math.lua} \endaltitem + \beginaltitem {util-str.lua} \endaltitem + \enddefinitions + \enddoublecolumns + \endnormalitem + + \beginnormalitem + The \emphasis{font loader} itself. + These files have been written for + \LUATEX-Fonts and they are distributed along + with \identifier{luaotfload}. + \begindoublecolumns + \begindefinitions + \beginaltitem{luatex-basics-gen.lua} \endaltitem + \beginaltitem{luatex-basics-nod.lua} \endaltitem + \beginaltitem{luatex-fonts-enc.lua} \endaltitem + \beginaltitem{luatex-fonts-syn.lua} \endaltitem + \beginaltitem{luatex-fonts-tfm.lua} \endaltitem + \beginaltitem{luatex-fonts-chr.lua} \endaltitem + \beginaltitem{luatex-fonts-lua.lua} \endaltitem + \beginaltitem{luatex-fonts-inj.lua} \endaltitem + \beginaltitem{luatex-fonts-otn.lua} \endaltitem + \beginaltitem{luatex-fonts-def.lua} \endaltitem + \beginaltitem{luatex-fonts-ext.lua} \endaltitem + \beginaltitem{luatex-fonts-cbk.lua} \endaltitem + \enddefinitions + \enddoublecolumns + \endnormalitem + + \beginnormalitem + Code related to \emphasis{font handling and + node processing}, taken directly from + \CONTEXT. + \begindoublecolumns + \begindefinitions + \beginaltitem{data-con.lua} \endaltitem + \beginaltitem{font-ini.lua} \endaltitem + \beginaltitem{font-con.lua} \endaltitem + \beginaltitem{font-cid.lua} \endaltitem + \beginaltitem{font-map.lua} \endaltitem + \beginaltitem{font-oti.lua} \endaltitem + \beginaltitem{font-otf.lua} \endaltitem + \beginaltitem{font-otb.lua} \endaltitem + \beginaltitem{font-ota.lua} \endaltitem + \beginaltitem{font-def.lua} \endaltitem + \beginaltitem{font-otp.lua} \endaltitem + \enddefinitions + \enddoublecolumns + \endnormalitem +\enddefinitions + +Note that if \identifier{luaotfload} cannot locate the +merged file, it will load the individual \LUA libraries +instead. +% +Their names remain the same as in \CONTEXT (without the +\inlinecode {otfl}-prefix) since we imported the relevant section of +\fileent{luatex-fonts.lua} unmodified into \fileent{luaotfload-main.lua}. +Thus if you prefer running bleeding edge code from the +\CONTEXT beta, all you have to do is remove +\fileent{luaotfload-merged.lua} from the search path. + +Also, the merged file at some point loads the Adobe Glyph List from a +\LUA table that is contained in \fileent{luaotfload-glyphlist.lua}, +which is automatically generated by the script +\fileent{mkglyphlist}.\footnote{% + See \fileent{luaotfload-font-enc.lua}. + The hard-coded file name is why we have to replace the procedure + that loads the file in \fileent{luaotfload-override.lua}. +} +There is a make target \identifier{glyphs} that will create a fresh +glyph list so we don’t need to import it from \CONTEXT any longer. + +In addition to these, \identifier{luaotfload} requires a number of +files not contained in the merge. Some of these have no equivalent in +\LUATEX-Fonts or \CONTEXT, some were taken unmodified from the latter. + + +\beginfilelist + \beginaltitem {luaotfload-features.lua} + font feature handling; incorporates some of the code from + \fileent{font-otc} from \CONTEXT; + \endaltitem + \beginaltitem {luaotfload-override.lua} + overrides the \CONTEXT logging functionality. + \endaltitem + \beginaltitem {luaotfload-loaders.lua} + registers the \OpenType font reader as handler for Postscript + fonts (\abbrev{pfa}, \abbrev{pfb}). + \endaltitem + \beginaltitem {luaotfload-parsers.lua} + various \abbrev{lpeg}-based parsers. + \endaltitem + \beginaltitem {luaotfload-database.lua} + font names database. + \endaltitem + \beginaltitem {luaotfload-colors.lua} + color handling. + \endaltitem + \beginaltitem {luaotfload-auxiliary.lua} + access to internal functionality for package authors (proposals + for additions welcome). + \endaltitem + \beginaltitem {luaotfload-letterspace.lua} + font-based letterspacing. + \endaltitem +\endfilelist + +\figurefloat + {file-graph} + {Schematic of the files in \identifier{Luaotfload}} + {filegraph.pdf} + +\endsection + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +\beginsection {Auxiliary Functions} +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +With release version 2.2, \identifier{luaotfload} received +additional functions for package authors to call from outside +(see the file \fileent{luaotfload-auxiliary.lua} for details). +% +The purpose of this addition twofold. +% +Firstly, \identifier{luaotfload} failed to provide a stable interface +to internals in the past which resulted in an unmanageable situation +of different packages abusing the raw access to font objects by means +of the \luafunction{patch_font} callback. +% +When the structure of the font object changed due to an update, all +of these imploded and several packages had to be fixed while +simultaneously providing fallbacks for earlier versions. +% +Now the patching is done on the \identifier{luaotfload} side and can +be adapted with future modifications to font objects without touching +the packages that depend on it. +% +Second, some the capabilities of the font loader and the names +database are not immediately relevant in \identifier{luaotfload} +itself but might nevertheless be of great value to package authors or +end users. + +Note that the current interface is not yet set in stone and the +development team is open to suggestions for improvements or +additions. + +\beginsubsection {Callback Functions} + +The \luafunction{patch_font} callback is inserted in the wrapper +\identifier{luaotfload} provides for the font definition callback +(see below, page \pageref{define-font}). +% +At this place it allows manipulating the font object immediately after +the font loader is done creating it. +% +For a short demonstration of its usefulness, here is a snippet that +writes an entire font object to the file \fileent{fontdump.lua}: + +\beginlisting + \input luaotfload.sty + \directlua{ + local dumpfile = "fontdump.lua" + local dump_font = function (tfmdata) + local data = table.serialize(tfmdata) + io.savedata(dumpfile, data) + end + + luatexbase.add_to_callback( + "luaotfload.patch_font", + dump_font, + "my_private_callbacks.dump_font" + ) + } + \font \dumpme = name:Iwona + \bye +\endlisting + +\emphasis{Beware}: this creates a Lua file of around 150,000 lines of +code, taking up 3~\abbrev{mb} of disk space. +% +By inspecting the output you can get a first impression of how a font +is structured in \LUATEX’s memory, what elements it is composed of, +and in what ways it can be rearranged. + +\beginsubsubsection {Compatibility with Earlier Versions} + +As has been touched on in the preface to this section, the structure +of the object as returned by the fontloader underwent rather drastic +changes during different stages of its development, and not all +packages that made use of font patching have kept up with every one +of it. +% +To ensure compatibility with these as well as older versions of +some packages, \identifier{luaotfload} sets up copies of or references +to data in the font table where it used to be located. +% +For instance, important parameters like the requested point size, the +units factor, and the font name have again been made accessible from +the toplevel of the table even though they were migrated to different +subtables in the meantime. + +\endsubsubsection + +\beginsubsubsection{Patches} + +These are mostly concerned with establishing compatibility with \XETEX. + +\beginfunctionlist + + \beginaltitem {set_sscale_dimens} + Calculate \texmacro{fontdimen}s 10 and 11 to emulate \XETEX. + \endaltitem + + \beginaltitem {set_capheight} + Calculates \texmacro{fontdimen} 8 like \XETEX. + \endaltitem + + \beginaltitem {patch_cambria_domh} + Correct some values of the font \emphasis{Cambria Math}. + \endaltitem + +\endfunctionlist + +\endsubsection + +\beginsubsection {Package Author’s Interface} + +As \LUATEX release 1.0 is nearing, the demand for a reliable interface +for package authors increases. + +\endsubsubsection + +\beginsubsubsection{Font Properties} + +Below functions mostly concern querying the different components of a +font like for instance the glyphs it contains, or what font features +are defined for which scripts. + +\beginfunctionlist + + \beginaltitem {aux.font_has_glyph (id : int, index : int)} + Predicate that returns true if the font \luafunction{id} + has glyph \luafunction{index}. + \endaltitem + + \beginaltitem {aux.slot_of_name(name : string)} + Translates an Adobe Glyph name to the corresponding glyph + slot. + \endaltitem + + \beginaltitem {aux.name_of_slot(slot : int)} + The inverse of \luafunction{slot_of_name}; note that this + might be incomplete as multiple glyph names may map to the + same codepoint, only one of which is returned by + \luafunction{name_of_slot}. + \endaltitem + + \beginaltitem {aux.provides_script(id : int, script : string)} + Test if a font supports \luafunction{script}. + \endaltitem + + \beginaltitem {aux.provides_language(id : int, script : string, language : string)} + Test if a font defines \luafunction{language} for a given + \luafunction{script}. + \endaltitem + + \beginaltitem {aux.provides_feature(id : int, script : string, + language : string, feature : string)} + Test if a font defines \luafunction{feature} for + \luafunction{language} for a given \luafunction{script}. + \endaltitem + + \beginaltitem {aux.get_math_dimension(id : int, dimension : string)} + Get the dimension \luafunction{dimension} of font \luafunction{id}. + \endaltitem + + \beginaltitem {aux.sprint_math_dimension(id : int, dimension : string)} + Same as \luafunction{get_math_dimension()}, but output the value + in scaled points at the \TEX end. + \endaltitem + +\endfunctionlist + +\endsubsubsection + +\beginsubsubsection{Database} + +%% not implemented, may come back later +\beginfunctionlist +% \beginaltitem {aux.scan_external_dir(dir : string)} +% Include fonts in directory \luafunction{dir} in font lookups without +% adding them to the database. +% + \beginaltitem {aux.read_font_index (void)} + Read the index file from the appropriate location (usually + the bytecode file \fileent{luaotfload-names.luc} somewhere + in the \fileent{texmf-var} tree) and return the result as a + table. The file is processed with each call so it is up to + the user to store the result for later access. + \endaltitem + + \beginaltitem {aux.font_index (void)} + Return a reference of the font names table used internally + by \identifier{luaotfload}. The index will be read if it + has not been loaded up to this point. Also a font scan that + overwrites the current index file might be triggered. Since + the return value points to the actual index, any + modifications to the table might influence runtime behavior + of \identifier{luaotfload}. + \endaltitem + +\endfunctionlist + +\endsubsubsection + +\endsubsection +\endsection + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +\beginsection {Troubleshooting} +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\beginsubsection {Database Generation} + +If you encounter problems with some fonts, please first update to the +latest version of this package before reporting a bug, as +\identifier{luaotfload} is under active development and still a moving +target. +% +The development takes place on \identifier{github} at +\hyperlink {https://github.com/lualatex/luaotfload} where there is an issue +tracker for submitting bug reports, feature requests and the likes. + +Bug reports are more likely to be addressed if they contain the output +of + +\beginlisting + luaotfload-tool --diagnose=environment,files,permissions +\endlisting + +\noindent Consult the man page for a description of these options. + +Errors during database generation can be traced by increasing the +verbosity level and redirecting log output to \fileent{stdout}: + +\beginlisting + luaotfload-tool -fuvvv --log=stdout +\endlisting + +\noindent or to a file in \fileent{/tmp}: + +\beginlisting + luaotfload-tool -fuvvv --log=file +\endlisting + +\noindent In the latter case, invoke the \inlinecode {tail(1)} utility on the +file for live monitoring of the progress. + +If database generation fails, the font last printed to the terminal or +log file is likely to be the culprit. +% +Please specify it when reporting a bug, and blacklist it for the time +being (see above, page \pageref{font-blacklist}). + +\endsubsection + +\beginsubsection {Font Features} + +A common problem is the lack of features for some +\OpenType fonts even when specified. +% +This can be related to the fact that some fonts do not provide features +for the \inlinecode {dflt} script (see above on page \pageref{script-tag}), +which is the default one in this package. +% +If this happens, assigning a noth script when the font is defined should +fix it. +% +For example with \inlinecode {latn}: + +\beginlisting + \font \test = file:MyFont.otf:script=latn;+liga; +\endlisting + +You can get a list of features that a font defines for scripts and +languages by querying it in \fileent{luaotfload-tool}: + +\beginlisting + luaotfload-tool --find="Iwona" --inspect +\endlisting + +\endsubsection + +\beginsubsection {\LUATEX Programming} + +Another strategy that helps avoiding problems is to not access raw +\LUATEX internals directly. +% +Some of them, even though they are dangerous to access, have not been +overridden or disabled. +% +Thus, whenever possible prefer the functions in the \luafunction{aux} +namespace over direct manipulation of font objects. For example, raw +access to the \luafunction{font.fonts} table like: + +\beginlisting + local somefont = font.fonts[2] +\endlisting + +\noindent can render already defined fonts unusable. +% +Instead, the function \luafunction{font.getfont()} should be used +because it has been replaced by a safe variant. + +However, \luafunction{font.getfont()} only covers fonts handled by the +font loader, e.~g. \identifier{OpenType} and \identifier{TrueType} +fonts, but not \abbrev{tfm} or \abbrev{ofm}. +% +Should you absolutely require access to all fonts known to \LUATEX, +including the virtual and autogenerated ones, then you need to query +both \luafunction{font.getfont()} and \luafunction{font.fonts}. +% +In this case, best define you own accessor: + +\beginlisting + local unsafe_getfont = function (id) + local tfmdata = font.getfont (id) + if not tfmdata then + tfmdata = font.fonts[id] + end + return tfmdata + end + + --- use like getfont() + local somefont = unsafe_getfont (2) +\endlisting + +\endsubsection +\endsection + +\beginsection {License} + +\identifier {luaotfload} is licensed under the terms of the +\hyperlink [GNU General Public License version 2.0]% + {https://www.gnu.org/licenses/old-licenses/gpl-2.0.html}. +Following the underlying fontloader code \identifier {luaotfload} +recognizes only that exact version as its license. +The „any later version” clause of the original license text as +copyrighted by the \hyperlink [Free Software Foundation]{http://www.fsf.org/} +\emphasis {does not apply} to either \identifier {luaotfload} or the +code imported from \CONTEXT. + +The complete text of the license is given as a separate file \fileent +{COPYING} in the toplevel directory of the +\hyperlink [\fileent {Luaotfload} Git repository]{https://github.com/lualatex/luaotfload/blob/master/COPYING}. +Distributions probably package it as \fileent +{doc/luatex/luaotfload/COPYING} in the relevant \fileent {texmf} tree. + +\endsection + +\endinput + diff --git a/doc/luaotfload-tool.rst b/doc/luaotfload-tool.rst new file mode 100644 index 0000000..4b1a934 --- /dev/null +++ b/doc/luaotfload-tool.rst @@ -0,0 +1,325 @@ +======================================================================= + luaotfload-tool +======================================================================= + +----------------------------------------------------------------------- + generate and query the Luaotfload font names database +----------------------------------------------------------------------- + +:Date: 2014-03-30 +:Copyright: GPL v2.0 +:Version: 2.5 +:Manual section: 1 +:Manual group: text processing + +SYNOPSIS +======================================================================= + +**luaotfload-tool** [ -bcDfFiIlLnpqRSuvVhw ] + +**luaotfload-tool** --update [ --force ] [ --quiet ] [ --verbose ] + [ --prefer-texmf ] [ --dry-run ] + [ --formats=[+|-]EXTENSIONS ] + [ --no-compress ] [ --no-strip ] + [ --local ] [ --max-fonts=N ] + +**luaotfload-tool** --find=FONTNAME [ --fuzzy ] [ --info ] [ --inspect ] + [ --no-reload ] + +**luaotfload-tool** --flush-lookups + +**luaotfload-tool** --cache=DIRECTIVE + +**luaotfload-tool** --list=CRITERION[:VALUE] [ --fields=F1,F2,...,Fn ] + +**luaotfload-tool** --bisect=DIRECTIVE + +**luaotfload-tool** --help + +**luaotfload-tool** --version + +**luaotfload-tool** --show-blacklist + +**luaotfload-tool** --diagnose=CHECK + +DESCRIPTION +======================================================================= + +luaotfload-tool accesses the font names database that is required by +the *Luaotfload* package. There are two general modes: **update** and +**query**. + ++ **update**: update the database or rebuild it entirely; ++ **query**: resolve a font name or display close matches. + +OPTIONS +======================================================================= + +update mode +----------------------------------------------------------------------- +--update, -u Update the database; indexes new fonts. +--force, -f Force rebuilding of the database; re-indexes + all fonts. +--local, -L Include font files in ``$PWD``. This option + will cause large parts of the database to be + rebuilt. Thus it is quite inefficient. + Additionally, if local font files are found, + the database is prevented from being saved + to disk, so the local fonts need to be parsed + with every invocation of ``luaotfload-tool``. +--no-reload, -n Suppress auto-updates to the database (e.g. + when ``--find`` is passed an unknown name). +--no-compress, -c Do not filter the plain text version of the + font index through gzip. Useful for debugging + if your editor is built without zlib. + +--prefer-texmf, -p Organize the file name database in a way so + that it prefer fonts in the *TEXMF* tree over + system fonts if they are installed in both. +--formats=EXTENSIONS Extensions of the font files to index. + Where *EXTENSIONS* is a comma-separated list of + supported file extensions (otf, ttf, ttc, + dfont, pfa, and pfb). If the list is prefixed + with a ``+`` sign, the given list is added to + the currently active one; ``-`` subtracts. + Default: *otf,ttf,ttc,dfont*. + Examples: + + 1) ``--formats=-ttc,ttf`` would skip + TrueType fonts and font collections; + 2) ``--formats=otf`` would scan only OpenType + files; + 3) ``--formats=+pfb`` includes binary + Postscript files. **Warning**: with a + standard TeX Live installation this will + grow the database considerably and slow down + font indexing. + +query mode +----------------------------------------------------------------------- +--find=NAME Resolve a font name; this looks up <name> in + the database and prints the file name it is + mapped to. + ``--find`` also understands request syntax, + i.e. ``--find=file:foo.otf`` checks whether + ``foo.otf`` is indexed. +--fuzzy, -F Show approximate matches to the file name if + the lookup was unsuccessful (requires + ``--find``). + +--info, -i Display basic information to a resolved font + file (requires ``--find``). +--inspect, -I Display detailed information by loading the + font and analyzing the font table; very slow! + For the meaning of the returned fields see + the LuaTeX documentation. + (requires ``--find``). +--warnings, -w Print the warnings generated by the fontloader + library (assumes ``-I``). Automatically enabled + if the verbosity level exceeds 2. + +--list=CRITERION Show entries, where *CRITERION* is one of the + following: + + 1) the character ``*``, selecting all entries; + 2) a field of a database entry, for instance + *version* or *format**, according to which + the output will be sorted. + Information in an unstripped database (see + the option ``--no-strip`` above) is nested: + Subfields of a record can be addressed using + the ``->`` separator, e. g. + ``file->location``, ``style->units_per_em``, + or + ``names->sanitized->english->prefmodifiers``. + NB: shell syntax requires that arguments + containing ``->`` be properly quoted! + 3) an expression of the form ``field:value`` to + limit the output to entries whose ``field`` + matches ``value``. + + For example, in order to output file names and + corresponding versions, sorted by the font + format:: + + ./luaotfload-tool.lua --list="format" --fields="file->base,version" + + This prints:: + + otf latinmodern-math.otf Version 1.958 + otf lmromancaps10-oblique.otf 2.004 + otf lmmono8-regular.otf 2.004 + otf lmmonoproplt10-bold.otf 2.004 + otf lmsans10-oblique.otf 2.004 + otf lmromanslant8-regular.otf 2.004 + otf lmroman12-italic.otf 2.004 + otf lmsansdemicond10-oblique.otf 2.004 + ... + +--fields=FIELDS Comma-separated list of fields that should be + printed. + Information in an unstripped database (see the + option ``--no-strip`` above) is nested: + Subfields of a record can be addressed using + the ``->`` separator, e. g. + ``file->location``, ``style->units_per_em``, + or ``names->sanitized->english->subfamily``. + The default is plainname,version*. + (Only meaningful with ``--list``.) + +font and lookup caches +----------------------------------------------------------------------- +--flush-lookups Clear font name lookup cache (experimental). + +--cache=DIRECTIVE Cache control, where *DIRECTIVE* is one of the + following: + + 1) ``purge`` -> delete Lua files from cache; + 2) ``erase`` -> delete Lua and Luc files from + cache; + 3) ``show`` -> print stats. + +debugging methods +----------------------------------------------------------------------- +--show-blacklist, -b Show blacklisted files (not directories). +--dry-run, -D Don’t load fonts when updating the database; + scan directories only. + (For debugging file system related issues.) +--no-strip Do not strip redundant information after + building the database. Warning: this will + inflate the index to about two to three times + the normal size. +--max-fonts=N Process at most *N* font files, including fonts + already indexed in the count. +--bisect=DIRECTIVE Bisection of the font database. + This mode is intended as assistance in + debugging the Luatex engine, especially when + tracking memleaks or buggy fonts. + + *DIRECTIVE* can be one of the following: + + 1) ``run`` -> Make ``luaotfload-tool`` respect + the bisection progress when running. + Combined with ``--update`` and possibly + ``--force`` this will only process the files + from the start up until the pivot and ignore + the rest. + 2) ``start`` -> Start bisection: create a + bisection state file and initialize the low, + high, and pivot indices. + 3) ``stop`` -> Terminate the current bisection + session by deleting the state file. + 4) ``good`` | ``bad`` -> Mark the section + processed last as “good” or “bad”, + respectively. The next bisection step will + continue with the bad section. + 5) ``status`` -> Print status information about + the current bisection session. Hint: Use + with higher verbosity settings for more + output. + + A bisection session is initiated by issuing the + ``start`` directive. This sets the pivot to the + middle of the list of available font files. + Now run *luaotfload-tool* with the ``--update`` + flag set as well as ``--bisect=run``: only the + fonts up to the pivot will be considered. If + that task exhibited the issue you are tracking, + then tell Luaotfload using ``--bisect=bad``. + The next step of ``--bisect=run`` will continue + bisection with the part of the files below the + pivot. + Likewise, issue ``--bisect=good`` in order to + continue with the fonts above the pivot, + assuming the tested part of the list did not + trigger the bug. + + Once the culprit font is tracked down, ``good`` + or ``bad`` will have no effect anymore. ``run`` + will always end up processing the single font + file that was left. + Use ``--bisect=stop`` to clear the bisection + state. + +miscellaneous +----------------------------------------------------------------------- +--verbose=N, -v Set verbosity level to *n* or the number of + repetitions of ``-v``. +--quiet No verbose output (log level set to zero). +--log=CHANNEL Redirect log output (for database + troubleshooting), where *CHANNEL* can be + + 1) ``stdout`` -> all output will be + dumped to the terminal (default); or + 2) ``file`` -> write to a file to the temporary + directory (the name will be chosen + automatically. + +--version, -V Show version numbers of components as well as + some basic information and exit. +--help, -h Show help message and exit. + +--diagnose=CHECK Run the diagnostic procedure *CHECK*. Available + procedures are: + + 1) ``files`` -> check *Luaotfload* files for + modifications; + 2) ``permissions`` -> check permissions of + cache directories and files; + 3) ``environment`` -> print relevant + environment and kpse variables; + 4) ``repository`` -> check the git repository + for new releases, + 5) ``index`` -> check database, display + information about it. + + Procedures can be chained by concatenating with + commas, e.g. ``--diagnose=files,permissions``. + Specify ``thorough`` to run all checks. + +FILES +======================================================================= + +The font name database is usually located in the directory +``texmf-var/luatex-cache/generic/names/`` (``$TEXMFCACHE`` as set in +``texmf.cnf``) of your *TeX Live* distribution as a zlib-compressed +file ``luaotfload-names.lua.gz``. +The experimental lookup cache will be created as +``luaotfload-lookup-cache.lua`` in the same directory. +These Lua tables are not used directly by Luaotfload, though. +Instead, they are compiled to Lua bytecode which is written to +corresponding files with the extension ``.luc`` in the same directory. +When modifying the files by hand keep in mind that only if the bytecode +files are missing will Luaotfload use the plain version instead. +Both kinds of files are safe to delete, at the cost of regenerating +them with the next run of *LuaTeX*. + +SEE ALSO +======================================================================= + +**luatex** (1), **lua** (1) + +* ``texdoc luaotfload`` to display the manual for the *Luaotfload* + package +* Luaotfload development `<https://github.com/lualatex/luaotfload>`_ +* LuaLaTeX mailing list `<http://tug.org/pipermail/lualatex-dev/>`_ +* LuaTeX `<http://luatex.org/>`_ +* ConTeXt `<http://wiki.contextgarden.net>`_ +* Luaotfload on CTAN `<http://ctan.org/pkg/luaotfload>`_ + +BUGS +======================================================================= + +Tons, probably. + +AUTHORS +======================================================================= + +*Luaotfload* is maintained by the LuaLaTeX dev team +(`<https://github.com/lualatex/>`__). +The fontloader code is provided by Hans Hagen of Pragma ADE, Hasselt +NL (`<http://pragma-ade.com/>`__). + +This manual page was written by Philipp Gesang +<philipp.gesang@alumni.uni-heidelberg.de>. + diff --git a/doc/luaotfload.conf.example b/doc/luaotfload.conf.example new file mode 100644 index 0000000..2756d62 --- /dev/null +++ b/doc/luaotfload.conf.example @@ -0,0 +1,30 @@ +;; Example configuration file for Luaotfload. This file contains the +;; defaults only, see luaotfload.conf(5) for more information. + +[db] + compress = true + formats = otf, ttf, ttc, dfont + max-fonts = 2.2517998136852e15 + scan-local = false + skip-read = false + strip = true + update-live = true + +[misc] + statistics = false + termwidth = nil + +[paths] + cache-dir = fonts + names-dir = names + index-file = luaotfload-names.lua + lookups-file = luaotfload-lookup-cache.lua + +[run] + color-callback = pre_linebreak_filter + definer = patch + log-level = 0 + resolver = cached + +;; vim:ft=dosini:et:sw=4:ts=8 + diff --git a/doc/luaotfload.conf.rst b/doc/luaotfload.conf.rst new file mode 100644 index 0000000..774095b --- /dev/null +++ b/doc/luaotfload.conf.rst @@ -0,0 +1,347 @@ +======================================================================= + luaotfload.conf +======================================================================= + +----------------------------------------------------------------------- + Luaotfload configuration file +----------------------------------------------------------------------- + +:Date: 2014-06-09 +:Copyright: GPL v2.0 +:Version: 2.5 +:Manual section: 5 +:Manual group: text processing + +SYNOPSIS +======================================================================= + +- **./luaotfload{.conf,rc}** +- **XDG_CONFIG_HOME/luaotfload/luaotfload{.conf,rc}** +- **~/.luaotfloadrc** + +DESCRIPTION +======================================================================= + +The file ``luaotfload.conf`` contains configuration options for +*Luaotfload*, a font loading and font management component for LuaTeX. + + +EXAMPLE +======================================================================= + +A small Luaotfload configuration file with few customizations could +look as follows: :: + + [db] + formats = afm, pfa, pfb + compress = false + + [misc] + termwidth = 60 + + [run] + log-level = 6 + +This will make Luaotfload ignore all font files except for PostScript +formats. NB: With a default Tex Live install the PS fonts will take +much longer to index than OpenType or TrueType ones. Also, an +uncompressed index file will be dumped which is going to be much larger +due to the huge amount of PostScript fonts indexed. The terminal width +is truncated to 60 characters which influences the verbose output +during indexing. Finally, the verbosity is increased greatly: each font +file being processed will be printed to the stdout on a separate line, +along with lots of other information. + +To observe the difference in behavior, save above snippet to +``./luaotfload.conf`` and update the font index: :: + + luaotfload --update --force + + +SYNTAX +======================================================================= + +The configuration file syntax follows the common INI format. For a more +detailed description please refer to the section “CONFIGURATION FILE” +of **git-config**\(1). A brief list of rules is given below: + + * Blank lines and lines starting with a semicolon (``;``) are ignored. + + * A configuration file is partitioned into sections that are declared + by specifying the section title in brackets on a separate line: :: + + [some-section] + ... section content ... + + * Sections consist of one or more variable assignments of the form + ``variable-name = value`` E. g.:: + + [foo] + bar = baz + quux = xyzzy + ... + + * Section and variable names may contain only uppercase and lowercase + letters as well as dashes (``-``). + + +VARIABLES +======================================================================= + +Variables in belong into a configuration section and their values must +be of a certain type. Some of them have further constraints. For +example, the “color callback” must be a string of one of the values +``pre_linebreak_filter`` or ``pre_output_filter``, defined in the +section *run*. + +Currently, the configuration is organized into four sections: + +db + Options relating to the font index. + +misc + Options without a clearly defined category. + +paths + Path and file name settings. + +run + Options controlling runtime behavior of Luaotfload. + +The list of valid variables, the sections they are part of and their +type is given below. Types represent Lua types that the values must be +convertible to; they are abbreviated as follows: ``s`` for the *string* +type, ``n`` for *number*, ``b`` for *boolean*. A value of ``nil`` means +the variable is unset. + + +Section ``db`` +----------------------------------------------------------------------- + ++---------------+--------+---------------------------+ +| variable | type | default | ++---------------+--------+---------------------------+ +| compress | b | ``true`` | ++---------------+--------+---------------------------+ +| formats | s | ``"otf,ttf,ttc,dfont"`` | ++---------------+--------+---------------------------+ +| max-fonts | n | ``2^51`` | ++---------------+--------+---------------------------+ +| scan-local | b | ``false`` | ++---------------+--------+---------------------------+ +| skip-read | b | ``false`` | ++---------------+--------+---------------------------+ +| strip | b | ``true`` | ++---------------+--------+---------------------------+ +| update-live | b | ``true`` | ++---------------+--------+---------------------------+ + +The flag ``compress`` determines whether the font index (usually +``luaotfload-names.lua[.gz]`` will be stored in compressed forms. +If unset it is equivalent of passing ``--no-compress`` to +**luaotfload-tool**. Since the file is only created for convenience +and has no effect on the runtime behavior of Luaotfload, the flag +should remain set. Most editors come with zlib support anyways. + +The list of ``formats`` must be a comma separated sequence of strings +containing one or more of these elements: + +* ``otf`` (OpenType format), +* ``ttf`` and ``ttc`` (TrueType format), +* ``dfont`` (Macintosh TrueType format), +* ``afm`` (Adobe Font Metrics), +* ``pfb`` and ``pfa`` (PostScript format). + +It corresponds loosely to the ``--formats`` option to +**luaotfload-tool**. Invalid or duplicate members are ignored; if the +list does not contain any useful identifiers, the default list +``"otf,ttf,ttc,dfont"`` will be used. + +The variable ``max-fonts`` determines after processing how many font +files the font scanner will terminate the search. This is useful for +debugging issues with the font index and has the same effect as the +option ``--max-fonts`` to **luaotfload-tools**. + +The ``scan-local`` flag, if set, will incorporate the current working +directory as a font search location. NB: This will potentially slow +down document processing because a font index with local fonts will not +be saved to disk, so these fonts will have to be re-indexed whenever +the document is built. + +The ``skip-read`` flag is only useful for debugging: It makes +Luaotfload skip reading fonts. The font information for rebuilding the +index is taken from the presently existing one. + +Unsetting the ``strip`` flag prevents Luaotfload from removing data +from the index that is only useful when processing font files. NB: this +can increase the size of the index files significantly and has no +effect on the runtime behavior. + +If ``update-live`` is set, Luaotfload will reload the database if it +cannot find a requested font. Those who prefer to update manually using +**luaotfload-tool** should unset this flag. + + +Section ``default-features`` +----------------------------------------------------------------------- + +By default Luaotfload enables ``node`` mode and picks the default font +features that are prescribed in the OpenType standard. This behavior +may be overridden in the ``default-features`` section. Global defaults +that will be applied for all scripts can be set via the ``global`` +option, others by the script they are to be applied to. For example, +a setting of :: + + [default-features] + global = mode=base,color=0000FF + dflt = smcp,onum + +would force *base* mode, tint all fonts blue and activate small +capitals and text figures globally. Features are specified as a comma +separated list of variables or variable-value pairs. Variables without +an explicit value are set to ``true``. + + +Section ``misc`` +----------------------------------------------------------------------- + ++---------------+--------+-------------------------+ +| variable | type | default | ++---------------+--------+-------------------------+ +| statistics | b | ``false`` | ++---------------+--------+-------------------------+ +| termwidth | n | ``nil`` | ++---------------+--------+-------------------------+ +| version | s | <Luaotfload version> | ++---------------+--------+-------------------------+ + +With ``statistics`` enabled, extra statistics will be collected during +index creation and appended to the index file. It may then be queried +at the Lua end or inspected by reading the file itself. + +The value of ``termwidth``, if set, overrides the value retrieved by +querying the properties of the terminal in which Luatex runs. This is +useful if the engine runs with ``shell_escape`` disabled and the actual +terminal dimensions cannot be retrieved. + +The value of ``version`` is derived from the version string hard-coded +in the Luaotfload source. Override at your own risk. + + +Section ``paths`` +----------------------------------------------------------------------- + ++------------------+--------+------------------------------------+ +| variable | type | default | ++------------------+--------+------------------------------------+ +| cache-dir | s | ``"fonts"`` | ++------------------+--------+------------------------------------+ +| names-dir | s | ``"names"`` | ++------------------+--------+------------------------------------+ +| index-file | s | ``"luaotfload-names.lua"`` | ++------------------+--------+------------------------------------+ +| lookups-file | s | ``"luaotfload-lookup-cache.lua"`` | ++------------------+--------+------------------------------------+ + +The paths ``cache-dir`` and ``names-dir`` determine the subdirectory +inside the Luaotfload subtree of the ``luatex-cache`` directory where +the font cache and the font index will be stored, respectively. + +Inside the index directory, the names of the index file and the font +lookup cache will be derived from the respective values of +``index-file`` and ``lookups-file``. This is the filename base for the +bytecode compiled version as well as -- for the index -- the gzipped +version. + + +Section ``run`` +----------------------------------------------------------------------- + ++------------------+--------+------------------------------+ +| variable | type | default | ++------------------+--------+------------------------------+ +| color-callback | s | ``"pre_linebreak_filter"`` | ++------------------+--------+------------------------------+ +| definer | s | ``"patch"`` | ++------------------+--------+------------------------------+ +| log-level | n | ``0`` | ++------------------+--------+------------------------------+ +| resolver | s | ``"cached"`` | ++------------------+--------+------------------------------+ + +The ``color-callback`` option determines the stage at which fonts that +defined with a ``color=xxyyzz`` feature will be colorized. By default +this happens in a ``pre_linebreak_filter`` but alternatively the +``pre_output_filter`` may be chosen, which is faster but might produce +inconsistent output. The latter also was the default in the 1.x series +of Luaotfload. + +The ``definer`` allows for switching the ``define_font`` callback. +Apart from the default ``patch`` one may also choose the ``generic`` +one that comes with the vanilla fontloader. Beware that this might +break tools like Fontspect that rely on the ``patch_font`` callback +provided by Luaotfload to perform important corrections on font data. + +The value of ``log-level`` sets the default verbosity of messages +printed by Luaotfload. Only messages defined with a verbosity of less +than or equal to the supplied value will be output on the terminal. +At a log level of five Luaotfload can be very noisy. Also, printing too +many messages will slow down the interpreter due to line buffering +being disabled (see **setbuf**\(3)). + +The ``resolver`` setting allows choosing the font name resolution +function: With the default value ``cached`` Luaotfload saves the result +of a successful font name request to a cache file to speed up +subsequent lookups. The alternative, ``normal`` circumvents the cache +and resolves every request individually. (Since to the restructuring of +the font name index in Luaotfload 2.4 the performance difference +between the cached and uncached lookups should be marginal.) + + +FILES +======================================================================= + +Luaotfload only processes the first configuration file it encounters at +one of the search locations. The file name may be either +``luaotfload.conf`` or ``luaotfloadrc``, except for the dotfile in the +user’s home directory which is expected at ``~/.luaotfloadrc``. + +Configuration files are located following a series of steps. The search +terminates as soon as a suitable file is encountered. The sequence of +locations that Luaotfload looks at is + +i. The current working directory of the LuaTeX process. +ii. The subdirectory ``luaotfload/`` inside the XDG configuration + tree, e. g. ``/home/oenothea/config/luaotfload/``. +iii. The dotfile. +iv. The *TEXMF* (using kpathsea). + + +SEE ALSO +======================================================================= + +**luaotfload-tool**\(1), **luatex**\(1), **lua**\(1) + +* ``texdoc luaotfload`` to display the PDF manual for the *Luaotfload* + package +* Luaotfload development `<https://github.com/lualatex/luaotfload>`_ +* LuaLaTeX mailing list `<http://tug.org/pipermail/lualatex-dev/>`_ +* LuaTeX `<http://luatex.org/>`_ +* Luaotfload on CTAN `<http://ctan.org/pkg/luaotfload>`_ + + +REFERENCES +======================================================================= + +* The XDG base specification + `<http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html>`_. + +AUTHORS +======================================================================= + +*Luaotfload* is maintained by the LuaLaTeX dev team +(`<https://github.com/lualatex/>`_). + +This manual page was written by Philipp Gesang +<philipp.gesang@alumni.uni-heidelberg.de>. + |