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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
\unprotect
\definenamespace [\v!letterspace] [
command=yes,
comment=Letterspace module,
name=\v!letterspace,
\s!parent=\v!letterspace,
setup=list,
style=no,
type=module,
version=hg,
]
%D \macros
%D {letterspace}
%D
%D \useURL [wschuster] [https://bitbucket.org/wolfs/] [] [Wolfgang Schuster]
%D \from[wschuster]’s {\em fancybreak} and {\em annotation}
%D modules served as the primary source for the following code.
%D You’ll have to thank him if it works and blame me if it doesn’t.
\appendtoks
\setuevalue{\currentletterspace}{\doletterspace [\currentletterspace]}%
\setuevalue{\e!start\currentletterspace}{\dostartletterspace[\currentletterspace]}%
\setuevalue{\e!stop \currentletterspace}{\dostopletterspace}%
\to \everydefineletterspace
\definecharacterkerning [letterspace:current]
\unexpanded\def\doletterspace[#1]{%
\edef\currentletterspace{#1}%
\dosingleempty\dodoletterspace%
}
\def\dodoletterspace[#1]{%
\iffirstargument
\doifassignment{#1}{%
\setupletterspace[\currentletterspace][#1]%
}%
\fi
\dododoletterspace%
}
\def\dododoletterspace#1{%
\def\currentobject{#1}%
\dontleavehmode
\setupcharacterkerning[letterspace:current][factor=\letterspaceparameter{spacefactor}]%
\def\letterspace_setstuff{%
\setcharacterkerning[letterspace:current]%
\advance \spaceskip \letterspaceparameter{textskip}%
\advance \xspaceskip \letterspaceparameter{textskip}%
}%
\ifhmode\ifnum\lastnodetype=\@@gluenode
\unskip{\letterspace_setstuff\ }%
\fi
\fi%
{\letterspace_setstuff\currentobject}%
\doifnextspace{%
{\letterspace_setstuff\ }%
\gobblespacetokens%
}%
}
%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%
}
%D \macros
%D {startletterspace,stopletterspace}
%D
%D These rely even more shamelessly on \from[wschuster]’s code
%D from the {\em fancybreak} module.
\unexpanded\def\dostartletterspace[#1]{%
\edef\currentletterspace{#1}%
\dosingleempty\dodostartletterspace%
}
\def\dodostartletterspace[#1]{%
\iffirstargument
\setupletterspace[\currentletterspace][#1]%
\fi
\dododoletterspace\bgroup%
}
\let\dostopletterspace\egroup
%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”
]
\defineletterspace[\v!letterspace]
\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
|
