TeX - LaTeX Asked by Spaceship on April 6, 2021
My intention is to create a class with a interface setup command myclsset
documentclass{myclass}
myclsset{key1=val1, key2=val2, ..} % key-value list
begin{document}
...
end{document}
where myclsset
, acting as document interface, can be smoothly used anywhere after documentclass{}
call. I choose pgfkeys
to implement for some specific reasons.
Here’s the .cls
file, in which I try to create a choice key whose value is a boolean if
switch that does formatting work for me:
NeedsTeXFormat{LaTeX2e}
ProvidesClass{myclass}[2019/03/27 My Test Class]
RequirePackage{pgfkeys,pgfopts}
newififmyclass@section@italic
pgfkeys{%
/myclass/.cd,
section/.is choice,
section/italic/.code = {myclass@section@italictrue}
}
% Set up the interface for the document class.
newcommand*{myclsset}[1]{%
pgfqkeys{/myclass}{#1}%
}
DeclareOption*{PassOptionsToClass{CurrentOption}{article}}
ProcessOptions
ProcessPgfOptions{/myclass} % Processing options through pkg/class
LoadClass{article} % Load base class
RequirePackage{titlesec} % Load a package
ifmyclass@section@italic
titleformat*{section}{itshape} % make section title italic
else
relax
fi
endinput
The MWE shows that documentclass[...]{myclass}
can work:
documentclass[section = italic]{myclass}
begin{document}
section{A Topic}
end{document}
However, this pattern:
documentclass{...}
myclsset{...} % key-value list in braces
does not work at all:
documentclass{myclass}
myclsset{section = italic}
begin{document}
section{A Topic}
end{document}
The section title does not switch to italic. So the question is what do I miss to fail to make myclsset
work?
The problem is that your ifmyclass@section@italic
condition is only checked when the class file is loaded, but your myclsset
call happens after that. myclsset
will then set the switch to true
correctly, the condition if never checked again, though.
What you want to do instead is to defer all the code that handles the current key setting until the actual document begins. For this purpose there's the AtBeginDocument{...}
hook.
Your section title handling would then look like
newcommandmyclass@handle@keys{%
ifmyclass@section@italic
titleformat*{section}{itshape} % make section title italic
else
relax
fi
}
AtBeginDocument{myclass@handle@keys}
No matter where in the preamble the key setting happens then, they will be processed correctly at the begin of the main part of the document.
Answered by siracusa on April 6, 2021
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