path: root/lualibs.dtx

% \iffalse meta-comment
%
% Copyright (C) 2009--2014 by PRAGMA ADE / ConTeXt Development Team
%
% See ConTeXt's mreadme.pdf for the license.
%
% This work consists of the main source file lualibs.dtx
% and the derived files lualibs.lua, lualibs-basic.lua,
% and lualibs-extended.lua.
%
% Unpacking:
%    tex lualibs.dtx
%
% Documentation:
%    lualatex lualibs.dtx
%
%    The class ltxdoc loads the configuration file ltxdoc.cfg
%    if available. Here you can specify further options, e.g.
%    use A4 as paper format:
%       \PassOptionsToClass{a4paper}{article}
%
%
%
%<*ignore>
\begingroup
  \def\x{LaTeX2e}%
\expandafter\endgroup
\ifcase 0\ifx\install y1\fi\expandafter
         \ifx\csname processbatchFile\endcsname\relax\else1\fi
         \ifx\fmtname\x\else 1\fi\relax
\else\csname fi\endcsname
%</ignore>
%<*install>
\input docstrip.tex
\Msg{************************************************************************}
\Msg{* Installation}
\Msg{* Package: lualibs 2014-07-26 v2.2 Lua additional functions.}
\Msg{************************************************************************}

\keepsilent
\askforoverwritefalse

\let\MetaPrefix\relax

\preamble
This is a generated file.

Copyright (C) 2009--2014 by PRAGMA ADE / ConTeXt Development Team

See ConTeXt's mreadme.pdf for the license.

This work consists of the main source file lualibs.dtx
and the derived file lualibs.lua.

\endpreamble

% The following hacks are to generate a lua file with lua comments starting by
% -- instead of %%

\def\MetaPrefix{-- }

\def\luapostamble{%
  \MetaPrefix^^J%
  \MetaPrefix\space End of File `\outFileName'.%
}

\def\currentpostamble{\luapostamble}%

\generate{%
  \usedir{tex/luatex/lualibs}%
  \file{lualibs.lua}{\from{lualibs.dtx}{lualibs}}%
}

\generate{%
  \usedir{tex/luatex/lualibs}%
  \file{lualibs-basic.lua}{\from{lualibs.dtx}{basic}}%
}

\generate{%
  \usedir{tex/luatex/lualibs}%
  \file{lualibs-extended.lua}{\from{lualibs.dtx}{extended}}%
}

\obeyspaces
\Msg{************************************************************************}
\Msg{*}
\Msg{* To finish the installation you have to move the following}
\Msg{* files into a directory searched by TeX:}
\Msg{*}
\Msg{*     lualibs.lua, lualibs-basic.lua, lualibs-extended.lua}
\Msg{*}
\Msg{* Happy TeXing!}
\Msg{*}
\Msg{************************************************************************}

\endbatchfile
%</install>
%<*ignore>
\fi
%</ignore>
%<*driver>
\NeedsTeXFormat{LaTeX2e}
\ProvidesFile{lualibs.drv}
  [2014/07/26 v2.2 Lua Libraries.]
\documentclass{ltxdoc}
\usepackage{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 lualibs package},
   pdfsubject={Port of the ConTeXt Lua libraries},
    pdfauthor={Elie Roux & Philipp Gesang},
  pdfkeywords={luatex, lualatex, unicode, opentype}
]{hyperref}
\newcommand*\email[1]{\href{mailto:#1}{#1}}
\usepackage{fontspec}
\setmainfont[
  Numbers=OldStyle,
  Ligatures=TeX,
]{Linux Libertine O}
\setmonofont [Ligatures=TeX,Scale=MatchLowercase] {Liberation Mono}
\setsansfont [Ligatures=TeX,Scale=MatchLowercase] {Iwona Medium}
\usepackage{metalogo}
\EnableCrossrefs
\CodelineIndex
\newcommand\TEX     {\TeX\xspace}
\newcommand\LATEX   {\LaTeX\xspace}
\newcommand\LUA     {Lua\xspace}
\newcommand\LUATEX  {\LuaTeX\xspace}
\newcommand\CONTEXT {Con\TeX t\xspace}

\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

\usepackage{titlesec}
\def\movecountertomargin#1{\llap{\rmfamily\upshape#1\hskip2em}}
\def\zeropoint{0pt}
%% we don’t have to grab attention like a child
\titleformat \part
             {\normalsize\bfseries}
             {\movecountertomargin\thepart} \zeropoint {}
\titleformat \section
             {\normalsize\scshape}%% no \word; life is full of disappointments
             {\movecountertomargin\thesection} \zeropoint {}
\titleformat \subsection
             {\small\itshape}
             {\movecountertomargin\thesubsection} \zeropoint {}
\renewcommand\partname{Part}%% gets rid of the stupid “file” heading

\usepackage{tocloft}
\renewcommand \cftpartfont   {\rmfamily\upshape}
\renewcommand \cftsecfont    {\rmfamily\upshape}
\renewcommand \cftsubsecfont {\rmfamily\upshape}
\setlength \cftbeforepartskip {1ex}
\setlength \cftbeforesecskip  {1ex}

\begin{document}
  \DocInput{lualibs.dtx}%
\end{document}
%</driver>
% \fi
% \CheckSum{0}
%
% \CharacterTable
%  {Upper-case    \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
%   Lower-case    \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
%   Digits        \0\1\2\3\4\5\6\7\8\9
%   Exclamation   \!     Double quote  \"     Hash (number) \#
%   Dollar        \$     Percent       \%     Ampersand     \&
%   Acute accent  \'     Left paren    \(     Right paren   \)
%   Asterisk      \*     Plus          \+     Comma         \,
%   Minus         \-     Point         \.     Solidus       \/
%   Colon         \:     Semicolon     \;     Less than     \<
%   Equals        \=     Greater than  \>     Question mark \?
%   Commercial at \@     Left bracket  \[     Backslash     \\
%   Right bracket \]     Circumflex    \^     Underscore    \_
%   Grave accent  \`     Left brace    \{     Vertical bar  \|
%   Right brace   \}     Tilde         \~}
%
% \GetFileInfo{lualibs.drv}
%
% \title{The \identifier{lualibs} package}
% \date{2014/07/26 v2.2}
% \author{Élie Roux      · \email{elie.roux@telecom-bretagne.eu}\\
%         Philipp Gesang · \email{philipp.gesang@alumni.uni-heidelberg.de}}
%
% \maketitle
%
% \begin{abstract}
% Additional \LUA functions taken from the \verb|l-*| and \verb|util-*| files
% of \CONTEXT.
% For an introduction on this package (among others), please refer
% to the document \fileent{lualatex-doc.pdf}.
% \end{abstract}
%
% \tableofcontents
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% \part{Package Description}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% \section{Overview}
%
% \LUA is a very minimal language, and it does only have a minimal standard
% library. The aim of this package is to provide an extended standard library,
% to be used by various \LUATEX packages. The code is specific to \LUATEX
% and depends on \LUATEX functions and modules not available in regular lua.
%
% \noindent The code is derived from \CONTEXT libraries.
%
% \section{Usage}
%
% You can either load the \identifier{lualibs} module, which will in turn load
% one of two sets of libraries provided by this package: |require("lualibs")|, or
% explicitly load the modules you need, e.g.: |require("lualibs-table")|,
% please note that some modules depend on others.
%
% \subsection{Loading Library Collections}
%
% The libraries are split into a \identifier{basic} and an
% \identifier{extended} collection.
% Though neither initialization time nor memory consumption will be noticably
% impacted,\footnote{%
%   Note that in terms of code this is only a small fraction of what
%   \CONTEXT loads with every run.
% }
% the \identifier{lualibs} package can skip loading of the latter on demand.
% The \luafunction{config} table needs to be present prior to loading the
% package for this to work (in the future this may be achieved by an option of
% \texmacro{usepackage}) for \LATEX users).
% In the \verb|lualibs| field, set \verb|load_extended| to false:
%
% \begin{quote}\begin{verbatim}
%   \directlua{
%     --- 1) create config table safely
%     config                        = config or { }
%     config.lualibs                = config.lualibs or { }
%
%     --- 2) unset the load_extended entry
%     config.lualibs.load_extended  = false
%
%     --- 3) load the lualibs
%     require "lualibs"
%   }
% \end{verbatim}\end{quote}
%
% However, there is no guarantee that the \identifier{extended} set remains
% permanently excluded.
% Re-loading the package at a later point will cancel this option and possibly
% add the missing libraries.
%
% \subsection{Loading libraries Individually}
% In order to load the \fileent{table} module you would actually have to prepare
% it as follows:
%
% \begin{quote}\begin{verbatim}
%   require"lualibs-lua"
%   require"lualibs-lpeg"
%   require"lualibs-table"
% \end{verbatim}\end{quote}
%
% \noindent
% If your code is run by the \fileent{texlua} intepreter, you will need to
% initialize \luafunction{kpse} library so that |require()| can find files
% under \abbrev{texmf} tree: |kpse.set_program_name("luatex")|.
%
% \section{Files}
%
% The \identifier{lualibs} bundle contains files from two \CONTEXT \LUA
% library categories: The generic auxiliary functions (original file prefix:
% |l-|) together form something close to a standard libary. Most of these are
% extensions of an existing namespace, like for instance |l-table.lua| which
% adds full-fledged serialization capabilities to the \LUA table library.
% They were imported under the \identifier{lualibs}-prefix and are contained
% in the \identifier{basic} collection.
% (For a list see table~\ref{tab:basic}.)
%
% \begin{table}[t]
%  \hrule
%  \centering
%  \caption{The \identifier{basic} set.}
%  \vskip1em
%  \begin{tabular}{l l l}
%   \identifier{lualibs} name & \CONTEXT name  & primary purpose                \\[1ex]
%   lualibs-lua.lua           & l-lua.lua      & compatibility                  \\
%   lualibs-package.lua       & l-package.lua  & \LUA file loaders              \\
%   lualibs-lpeg.lua          & l-lpeg.lua     & patterns                       \\
%   lualibs-function.lua      & l-function.lua & defines a dummy function       \\
%   lualibs-string.lua        & l-string.lua   & string manipulation            \\
%   lualibs-table.lua         & l-table.lua    & serialization, conversion      \\
%   lualibs-boolean.lua       & l-boolean.lua  & boolean converter              \\
%   lualibs-number.lua        & l-number.lua   & bit operations                 \\
%   lualibs-math.lua          & l-math.lua     & math functions                 \\
%   lualibs-io.lua            & l-io.lua       & reading and writing files      \\
%   lualibs-os.lua            & l-os.lua       & platform specific code         \\
%   lualibs-file.lua          & l-file.lua     & filesystem operations          \\
%   lualibs-gzip.lua          & l-gzip.lua     & wrapper for \identifier{lgzip} \\
%   lualibs-md5.lua           & l-md5.lua      & checksum functions             \\
%   lualibs-dir.lua           & l-dir.lua      & directory handling             \\
%   lualibs-unicode.lua       & l-unicode.lua  & utf and unicode                \\
%   lualibs-url.lua           & l-url.lua      & url handling                   \\
%   lualibs-set.lua           & l-set.lua      & sets                           \\[1ex]
%  \end{tabular}
%  \label{tab:basic}
%  \hrule
% \end{table}
%
% The \identifier{extended} category comprises a selection of files mostly from
% the utilities namespace (|util-|; cf. table~\ref{tab:extended}).
% Their purpose is more specific and at times quite low-level.
% Additionally, the file \fileent{trac-inf.lua} has been included because it is
% essential to some of the code loaded subsequently.
%
% \begin{table}[t]
%  \hrule
%  \centering
%  \caption{The \identifier{extended} set.}
%  \vskip1em
%  \begin{tabular}{l l l}
%   \identifier{lualibs} name & \CONTEXT name  & primary purpose                  \\[1ex]
%   lualibs-util-str.lua      & util-str.lua   & extra |string| functions         \\
%   lualibs-util-tab.lua      & util-tab.lua   & extra |table| functions          \\
%   lualibs-util-sto.lua      & util-sto.lua   & table allocation                 \\
%   lualibs-util-prs.lua      & util-sto.lua   & miscellaneous parsers            \\
%   lualibs-util-dim.lua      & util-dim.lua   & conversion between dimensions    \\
%   lualibs-trac-inf.lua      & trac-inf.lua   & timing, statistics               \\
%   lualibs-util-lua.lua      & util-lua.lua   & operations on bytecode           \\
%   lualibs-util-deb.lua      & util-deb.lua   & extra |debug| functionality      \\
%   lualibs-util-tpl.lua      & util-tpl.lua   & templating                       \\
%   lualibs-util-sta.lua      & util-sta.lua   & stacker (e.~g. for \abbrev{pdf}) \\
%   lualibs-util-jsn.lua      & util-jsn.lua   & conversion to and from json      \\[1ex]
%  \end{tabular}
%  \label{tab:extended}
%  \hrule
% \end{table}
%
% \section{Packaging}
%
% By default, \identifier{lualibs} will not load the libraries individually.
% Instead, it includes two \emphasis{merged packages} that have been compiled
% from the original files.
% This is achieved by means of \identifier{mtx-package}, a script for bundling
% \LUA code shipped with \CONTEXT.
% This concatenates the code of several \LUA files into a single file that is
% both easier to distribute and loading (marginally) faster.
% \identifier{mtx-package} ensures that the code from each file gets its
% own closure and strips newlines and comments, resulting in a smaller payload.
% Another package that relies on it heavily is the font loader as contained in
% \identifier{luaotfload} and \identifier{luatex-fonts}.
%
% If \CONTEXT is installed on the system, the merge files can be created
% by running:
%
% \begin{quote}\begin{verbatim}
%   mtxrun --script package --merge lualibs-basic.lua
%   mtxrun --script package --merge lualibs-extended.lua
% \end{verbatim}\end{quote}
%
% \noindent
% Of course there is a make target for that:
%
% \begin{quote}\begin{verbatim}
%   make merge
% \end{verbatim}\end{quote}
% \noindent
% will take care of assembling the packages from the files distributed with
% \identifier{lualibs}.
%
% For this to work, the syntax of the \LUA file needs to be well-formed:
% files that should be merged must be included via a function
% \verb|loadmodule()|.
% It doesn’t matter if the function actually does something; a dummy will
% suffice.
% Also, the argument to \verb|loadmodule()| must be wrapped in parentheses.
% This rule is quite convenient, actually, since it allows excluding files
% from the merge while still using \verb|loadmodule()| consistently.
%
% \begin{quote}\begin{verbatim}
%   ...
%   loadmodule("my-lua-file.lua") -- <= will be merged
%   loadmodule('my-2nd-file.lua') -- <= will be merged
%   loadmodule "my-3rd-file.lua"  -- <= will be ignored
%   ...
% \end{verbatim}\end{quote}
%
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% \part{\fileent{lualibs.lua}}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% \iffalse
%<*lualibs>
% \fi
%    \begin{macrocode}
lualibs = lualibs or { }

lualibs.module_info = {
  name          = "lualibs",
  version       = 2.2,
  date          = "2014-07-26",
  description   = "ConTeXt Lua standard libraries.",
  author        = "Hans Hagen, PRAGMA-ADE, Hasselt NL & Elie Roux & Philipp Gesang",
  copyright     = "PRAGMA ADE / ConTeXt Development Team",
  license       = "See ConTeXt's mreadme.pdf for the license",
}

%    \end{macrocode}
%   The behavior of the lualibs can be configured to some extent.
%   \begin{itemize}
%     \item Based on the parameter \verb|lualibs.prefer_merged|, the
%           libraries can be loaded via the included merged packages or
%           the individual files.
%     \item Two classes of libraries are distinguished, mainly because
%           of a similar distinction in \CONTEXT, but also to make
%           loading of the less fundamental functionality optional.
%           While the “basic” collection is always loaded, the
%           configuration setting \verb|lualibs.load_extended| triggers
%           inclusion of the extended collection.
%     \item Verbosity can be increased via the \verb|verbose| switch.
%   \end{itemize}
%
%    \begin{macrocode}

config           = config or { }
config.lualibs   = config.lualibs or { }

if config.lualibs.prefer_merged ~= nil then
  lualibs.prefer_merged = config.lualibs.prefer_merged
else
  lualibs.prefer_merged = true
end

if config.lualibs.load_extended ~= nil then
  lualibs.load_extended = config.lualibs.load_extended
else
  lualibs.load_extended = true
end

if config.lualibs.verbose ~= nil then
  config.lualibs.verbose = config.lualibs.verbose
else
  config.lualibs.verbose = false
end

%    \end{macrocode}
%     The lualibs may be loaded in scripts.
%     To account for the different environment, fallbacks for
%     the luatexbase facilities are installed.
%
%    \begin{macrocode}

local dofile          = dofile
local kpsefind_file   = kpse.find_file
local stringformat    = string.format
local texiowrite_nl   = texio.write_nl

local find_file, error, warn, info
do
  local _error, _warn, _info
  if luatexbase and luatexbase.provides_module then
    _error, _warn, _info = luatexbase.provides_module(lualibs.module_info)
  else
    _error, _warn, _info = texiowrite_nl, texiowrite_nl, texiowrite_nl
  end

  if lualibs.verbose then
    error, warn, info = _error, _warn, _info
  else
    local dummylogger = function ( ) end
    error, warn, info = _error, dummylogger, dummylogger
  end
  lualibs.error, lualibs.warn, lualibs.info = error, warn, info
end

if luatexbase and luatexbase.find_file then
  find_file = luatexbase.find_file
else
  kpse.set_program_name"luatex"
  find_file = kpsefind_file
end

%    \end{macrocode}
%     The lualibs load a merged package by default.
%     In order to create one of these, the meta file that includes the
%     libraries must satisfy certain assumptions \verb|mtx-package| makes
%     about the coding style.
%     Most important is that the functions that indicates which files
%     to include must go by the name \verb|loadmodule()|.
%     For this reason we define a \verb|loadmodule()| function as a
%     wrapper around \verb|dofile()|.
%
%    \begin{macrocode}

local loadmodule = loadmodule or function (name, t)
  if not t then t = "library" end
  local filepath  = find_file(name, "lua")
  if not filepath or filepath == "" then
    warn(stringformat("Could not locate %s “%s”.", t, name))
    return false
  end
  dofile(filepath)
  return true
end

lualibs.loadmodule = loadmodule

%    \end{macrocode}
%     The separation of the “basic” from the “extended” sets coincides
%     with the split into luat-bas.mkiv and luat-lib.mkiv.
%
%    \begin{macrocode}

if lualibs.basic_loaded        ~= true
or config.lualibs.force_reload == true
then
  loadmodule"lualibs-basic.lua"
  loadmodule"lualibs-compat.lua" --- restore stuff gone since v1.*
end

if  lualibs.load_extended       == true
and lualibs.extended_loaded     ~= true
or  config.lualibs.force_reload == true
then
  loadmodule"lualibs-extended.lua"
end

--- This restores the default of loading everything should a package
--- have requested otherwise. Will be gone once there is a canonical
--- interface for parameterized loading of libraries.
config.lualibs.load_extended = true

-- vim:tw=71:sw=2:ts=2:expandtab

%    \end{macrocode}
%
% \iffalse
%</lualibs>
% \fi
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% \part{\fileent{lualibs-basic.lua}}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% \iffalse
%<*basic>
% \fi
%    \begin{macrocode}
lualibs                 = lualibs or { }
local info              = lualibs.info
local loadmodule        = lualibs.loadmodule

local lualibs_basic_module = {
  name          = "lualibs-basic",
  version       = 2.2,
  date          = "2014-07-26",
  description   = "ConTeXt Lua libraries -- basic collection.",
  author        = "Hans Hagen, PRAGMA-ADE, Hasselt NL & Elie Roux & Philipp Gesang",
  copyright     = "PRAGMA ADE / ConTeXt Development Team",
  license       = "See ConTeXt's mreadme.pdf for the license",
}

local loaded = false --- track success of package loading

if lualibs.prefer_merged then
  info"Loading merged package for collection “basic”."
  loaded = loadmodule('lualibs-basic-merged.lua')
else
  info"Ignoring merged packages."
  info"Falling back to individual libraries from collection “basic”."
end

%    \end{macrocode}
%     \verb|mtx-package| expects the files to be included by
%     \verb|loadmodule|.
%     If run on this file, it will create \verb|lualibs-basic-merged.lua|
%     from all the files mentioned in the next block.
%
%    \begin{macrocode}

if loaded == false then
  loadmodule("lualibs-lua.lua")
  loadmodule("lualibs-package.lua")
  loadmodule("lualibs-lpeg.lua")
  loadmodule("lualibs-function.lua")
  loadmodule("lualibs-string.lua")
  loadmodule("lualibs-table.lua")
  loadmodule("lualibs-boolean.lua")
  loadmodule("lualibs-number.lua")
  loadmodule("lualibs-math.lua")
  loadmodule("lualibs-io.lua")
  loadmodule("lualibs-os.lua")
  loadmodule("lualibs-file.lua")
  loadmodule("lualibs-gzip.lua")
  loadmodule("lualibs-md5.lua")
  loadmodule("lualibs-dir.lua")
  loadmodule("lualibs-unicode.lua")
  loadmodule("lualibs-url.lua")
  loadmodule("lualibs-set.lua")
end

lualibs.basic_loaded = true
-- vim:tw=71:sw=2:ts=2:expandtab

%    \end{macrocode}
%
% \iffalse
%</basic>
% \fi
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% \part{\fileent{lualibs-extended.lua}}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% \iffalse
%<*extended>
% \fi
%    \begin{macrocode}
lualibs = lualibs or { }

%    \end{macrocode}
%     Loading the \emph{extended} set requires a tad more effort, but
%     it’s well invested.
%
%     Since we only want the functionality, we have to simulate parts
%     of a running \CONTEXT environment, above all logging, that some
%     of the more involved libraries cannot be loaded without.
%     Also, one utility file cannot be packaged because it returns a
%     table which would preclude loading of later code.
%     Thus, we remove it from the natural loading chain (it is not
%     critical) and append it at the end.
%
%    \begin{macrocode}

local lualibs_extended_module = {
  name          = "lualibs-extended",
  version       = 2.2,
  date          = "2014-07-26",
  description   = "ConTeXt Lua libraries -- extended collection.",
  author        = "Hans Hagen, PRAGMA-ADE, Hasselt NL & Elie Roux & Philipp Gesang",
  copyright     = "PRAGMA ADE / ConTeXt Development Team",
  license       = "See ConTeXt's mreadme.pdf for the license",
}


local stringformat     = string.format
local loadmodule       = lualibs.loadmodule
local texiowrite       = texio.write
local texiowrite_nl    = texio.write_nl

%    \end{macrocode}
%     Here we define some functions that fake the elaborate
%     logging/tracking mechanism Context provides.
%
%    \begin{macrocode}

local error, logger, mklog
if luatexbase and luatexbase.provides_module then
  --- TODO test how those work out when running tex
  local __error,_,_,__logger =
    luatexbase.provides_module(lualibs_extended_module)
  error  = __error
  logger = __logger
  mklog = function ( ) return logger end
else
  mklog = function (t)
    local prefix = stringformat("[%s] ", t)
    return function (...)
      texiowrite_nl(prefix)
      texiowrite   (stringformat(...))
    end
  end
  error  = mklog"ERROR"
  logger = mklog"INFO"
end

local info = lualibs.info

%    \end{macrocode}
%     We temporarily put our own global table in place and restore
%     whatever we overloaded afterwards.
%
%     \CONTEXT\ modules each have a custom logging mechanism that can be
%     enabled for debugging.
%     In order to fake the presence of this facility we need to define at
%     least the function \verb|logs.reporter|.
%     For now it’s sufficient to make it a reference to \verb|mklog| as
%     defined above.
%
%    \begin{macrocode}

local dummy_function = function ( ) end
local newline        = function ( ) texiowrite_nl"" end

local fake_logs = function (name)
  return {
    name     = name,
    enable   = dummy_function,
    disable  = dummy_function,
    reporter = mklog,
    newline  = newline
  }
end

local fake_trackers = function (name)
  return {
    name     = name,
    enable   = dummy_function,
    disable  = dummy_function,
    register = mklog,
    newline  = newline,
  }
end

local backup_store = { }

local fake_context = function ( )
  if logs     then backup_store.logs     = logs     end
  if trackers then backup_store.trackers = trackers end
  logs     = fake_logs"logs"
  trackers = fake_trackers"trackers"
end


%    \end{macrocode}
% Restore a backed up logger if appropriate.
%
%    \begin{macrocode}
local unfake_context = function ( )
  if backup_store then
    local bl, bt = backup_store.logs, backup_store.trackers
    if bl   then logs     = bl   end
    if bt   then trackers = bt   end
  end
end

fake_context()

local loaded = false
if lualibs.prefer_merged then
  info"Loading merged package for collection “extended”."
  loaded = loadmodule('lualibs-extended-merged.lua')
else
  info"Ignoring merged packages."
  info"Falling back to individual libraries from collection “extended”."
end

if loaded == false then
  loadmodule("lualibs-util-str.lua")--- string formatters (fast)
  loadmodule("lualibs-util-tab.lua")--- extended table operations
  loadmodule("lualibs-util-sto.lua")--- storage (hash allocation)
  ----------("lualibs-util-pck.lua")---!packers; necessary?
  ----------("lualibs-util-seq.lua")---!sequencers (function chaining)
  ----------("lualibs-util-mrg.lua")---!only relevant in mtx-package
  loadmodule("lualibs-util-prs.lua")--- miscellaneous parsers; cool. cool cool cool
  ----------("lualibs-util-fmt.lua")---!column formatter (rarely used)
  loadmodule("lualibs-util-dim.lua")--- conversions between dimensions
  loadmodule("lualibs-util-jsn.lua")--- JSON parser

  ----------("lualibs-trac-set.lua")---!generalization of trackers
  ----------("lualibs-trac-log.lua")---!logging
  loadmodule("lualibs-trac-inf.lua")--- timing/statistics
  loadmodule("lualibs-util-lua.lua")--- operations on lua bytecode
  loadmodule("lualibs-util-deb.lua")--- extra debugging
  loadmodule("lualibs-util-tpl.lua")--- templating
  loadmodule("lualibs-util-sta.lua")--- stacker (for writing pdf)
end

unfake_context() --- TODO check if this works at runtime

lualibs.extended_loaded = true
-- vim:tw=71:sw=2:ts=2:expandtab

%    \end{macrocode}
%
% \iffalse
%</extended>
% \fi
%
% \Finale
\endinput