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%D \module [
%D file=t-letterspace,
%D version=2011-03-15T12:59:48+0100 or later,
%D title=\CONTEXT\ User Module,
%D subtitle=Letterspacing commands,
%D author=Philipp Gesang,
%D date=\currentdate,
%D copyright=Philipp Gesang,
%D license=2-clause BSD,
%D ]
\writestatus{loading}{ConTeXt User Module / Letterspace}
\startmodule [letterspace]
\startinterface all
\setinterfacevariable {letterspace} {letterspace}
\stopinterface
\definenamespace [letterspace] [
command=yes,
comment=Letterspacing module,
name=letterspace,
parent=letterspace,
setup=list,
style=no,
type=module,
version=hg,
]
\unprotect
%D \macros
%D {setupletterspace}
%D
%D Initial setup.
%D Setting the normal inline letterspacing factor
%D \type{textfactor} and a separate factor for capital spacing
%D \type{capfactor}.
\setupletterspace [%
capfactor=.05,
capskip=.33em,
textfactor=.125,
textskip=.33em,
shortcommands=false, % “true” | “yes” | “yep” -- defaults to “false”
]
%D Defining two letterspace settings.
\definecharacterkerning [textspace]
\definecharacterkerning [capspace]
\setupcharacterkerning [textspace] [factor=\letterspaceparameter{textfactor}]
\setupcharacterkerning [capspace] [factor=\letterspaceparameter{capfactor}]
\unexpanded\def\letterspace_letterspace#1{%
\letterspace_do_letterspace{l}{#1}%
}
\unexpanded\def\letterspace_capitalspace#1{%
\letterspace_do_letterspace{c}{#1}%
}
\let \letterspace\letterspace_letterspace
\let\capitalspace\letterspace_capitalspace
\def\letterspace_do_letterspace#1#2{%
\doif{#1}{l}{%
\let\currentletterspacecmd\letterspace_dodo_letterspace%
}%
\doif{#1}{c}{%
\let\currentletterspacecmd\letterspace_dodo_capitalspace%
}%
\ifhmode\ifnum\lastnodetype=\@@gluenode
\unskip{\currentletterspacecmd\ }%
\fi
\fi%
{\currentletterspacecmd#2}%
\doifnextspace{%
{\currentletterspacecmd\ }%
\gobblespacetokens%
}%
}
\def\letterspace_dodo_letterspace{%
\dontleavehmode \setcharacterkerning[textspace]%
\advance \spaceskip \letterspaceparameter{textskip}%
\advance \xspaceskip \letterspaceparameter{textskip}%
}%
\def\letterspace_dodo_capitalspace{%
\dontleavehmode \setcharacterkerning[capspace]%
\advance \spaceskip \letterspaceparameter{capskip}%
\advance \xspaceskip \letterspaceparameter{capskip}%
}%
%D This is a partial ripoff of a couple of macros from
%D \type{syst-aux.mkiv}.
%D \useURL [flet] [http://www.tug.org/TUGboat/Articles/tb09-3/tb22bechtolsheim.pdf] [] [\type{futurelet}]
%D Very helpful for further understanding of what’s exactly going
%D on: Stephan von Bechtolsheim’s tutorial on \from[flet].
\def\doifnextspace#1{%
\def\!!string{#1}%
\futurelet\nexttoken\inspectnexttoken%
}
\def\inspectnexttoken{%
\ifx\nexttoken\blankspace
\@EA\!!string
\fi%
}
\def\letterspace_truestrings{true,yep,yes}
\def\letterspace_define_shortcommands{%
\doifinset{\letterspaceparameter{shortcommands}}{\letterspace_truestrings}{%
\writestatus{letterspace}{enabling short commands}%
\global\let\CS\capitalspace%
\global\let\LS\letterspace%
}%
}
\appendtoks \letterspace_define_shortcommands \to \everystarttext
\protect \stopmodule \endinput
% vim:ft=context:sw=2:ts=2
|
