我喜欢用 Joseph Wright 的模型 dtx 文件来创建样式文件，但也想用它来上课。所以我做了一些替换（sty->cls等），得到了这个democls.dtx：
% \iffalse meta-comment
% !TEX program = pdfLaTeX
%<*internal>
\iffalse
%</internal>
%<*readme>
----------------------------------------------------------------
democls --- description text
E-mail: [email protected]
Released under the LaTeX Project Public License v1.3c or later
See http://www.latex-project.org/lppl.txt
----------------------------------------------------------------
Some text about the class: probably the same as the abstract.
%</readme>
%<*internal>
\fi
\def\nameofplainTeX{plain}
\ifx\fmtname\nameofplainTeX\else
\expandafter\begingroup
\fi
%</internal>
%<*install>
\input docstrip.tex
\keepsilent
\askforoverwritefalse
\preamble
----------------------------------------------------------------
democls --- description text
E-mail: [email protected]
Released under the LaTeX Project Public License v1.3c or later
See http://www.latex-project.org/lppl.txt
----------------------------------------------------------------
\endpreamble
\postamble
Copyright (C) 2009 by You <[email protected]>
This work may be distributed and/or modified under the
conditions of the LaTeX Project Public License (LPPL), either
version 1.3c of this license or (at your option) any later
version. The latest version of this license is in the file:
http://www.latex-project.org/lppl.txt
This work is "maintained" (as per LPPL maintenance status) by
You.
This work consists of the file democls.dtx
and the derived files democls.ins,
democls.pdf and
democls.cls.
\endpostamble
\usedir{tex/latex/democls}
\generate{
\file{\jobname.cls}{\from{\jobname.dtx}{class}}
}
%</install>
%<install>\endbatchfile
%<*internal>
\usedir{source/latex/democls}
\generate{
\file{\jobname.ins}{\from{\jobname.dtx}{install}}
}
\nopreamble\nopostamble
\usedir{doc/latex/democls}
\generate{
\file{README.txt}{\from{\jobname.dtx}{readme}}
}
\ifx\fmtname\nameofplainTeX
\expandafter\endbatchfile
\else
\expandafter\endgroup
\fi
%</internal>
%<*class>
\NeedsTeXFormat{LaTeX2e}
\ProvidesClass{democls}[2009/10/06 v1.0 description text]
%</class>
%<*driver>
\documentclass{ltxdoc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage[numbered]{hypdoc}
\EnableCrossrefs
\CodelineIndex
\RecordChanges
\begin{document}
\DocInput{\jobname.dtx}
\end{document}
%</driver>
% \fi
%
%\GetFileInfo{\jobname.cls}
%
%\title{^^A
% \textsf{democls} --- description text\thanks{^^A
% This file describes version \fileversion, last revised \filedate.^^A
% }^^A
%}
%\author{^^A
% You\thanks{E-mail: [email protected]}^^A
%}
%\date{Released \filedate}
%
%\maketitle
%
%\changes{v1.0}{2009/10/06}{First public release}
%
%\DescribeMacro{\examplemacro}
% Some text about an example macro called \cs{examplemacro}, which
% might have an optional argument \oarg{arg1} and mandatory one
% \marg{arg2}.
%
%\StopEventually{^^A
% \PrintChanges
% \PrintIndex
%}
%
% \begin{macrocode}
%<*class>
% \end{macrocode}
%
%\begin{macro}{\examplemacro}
%\changes{v1.0}{2009/10/06}{Some change from the previous version}
% \begin{macrocode}
\newcommand*\examplemacro[2][]{%
Some code here, probably
}
% \end{macrocode}
%\end{macro}
%
% \begin{macrocode}
%</class>
% \end{macrocode}
%\Finale
但是，编译dtx文件表明，由生成的\filedate和得到了错误的值：\fileversion\GetFileInfo
@MartinScharrer 对相关问题发表了评论：
不过，我猜问题的根源是\ProvidesClass之前的那行\documentclass。它应该在那里，至少不是以这种形式，因为它被视为驱动程序文档的一部分。有些\iffalse .. \fi缺失或使用%<class>\ProvidesClass代替。
我一直在移动东西，但democls.dtx毫无效果。我该如何让它工作？
答案1
您只能使用\GetFileInfo作为 LaTeX 运行的一部分加载的代码，这限制了此处对包的使用（除非您正在编写代码文档的类）。因此，您必须以另一种方式输入信息。最简单的方法是定义\fileversion并\filedate
% \iffalse meta-comment
%<*internal>
\iffalse
%</internal>
%<*readme>
----------------------------------------------------------------
democls --- description text
E-mail: [email protected]
Released under the LaTeX Project Public License v1.3c or later
See http://www.latex-project.org/lppl.txt
----------------------------------------------------------------
Some text about the class: probably the same as the abstract.
%</readme>
%<*internal>
\fi
\def\nameofplainTeX{plain}
\ifx\fmtname\nameofplainTeX\else
\expandafter\begingroup
\fi
%</internal>
%<*install>
\input docstrip.tex
\keepsilent
\askforoverwritefalse
\preamble
----------------------------------------------------------------
democls --- description text
E-mail: [email protected]
Released under the LaTeX Project Public License v1.3c or later
See http://www.latex-project.org/lppl.txt
----------------------------------------------------------------
\endpreamble
\postamble
Copyright (C) 2009 by You <[email protected]>
This work may be distributed and/or modified under the
conditions of the LaTeX Project Public License (LPPL), either
version 1.3c of this license or (at your option) any later
version. The latest version of this license is in the file:
http://www.latex-project.org/lppl.txt
This work is "maintained" (as per LPPL maintenance status) by
You.
This work consists of the file democls.dtx
and the derived files democls.ins,
democls.pdf and
democls.cls.
\endpostamble
\usedir{tex/latex/democls}
\generate{
\file{\jobname.cls}{\from{\jobname.dtx}{class}}
}
%</install>
%<install>\endbatchfile
%<*internal>
\usedir{source/latex/democls}
\generate{
\file{\jobname.ins}{\from{\jobname.dtx}{install}}
}
\nopreamble\nopostamble
\usedir{doc/latex/democls}
\generate{
\file{README.txt}{\from{\jobname.dtx}{readme}}
}
\ifx\fmtname\nameofplainTeX
\expandafter\endbatchfile
\else
\expandafter\endgroup
\fi
%</internal>
%<*class>
\NeedsTeXFormat{LaTeX2e}
%</class>
%<*driver>
\documentclass{ltxdoc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage[numbered]{hypdoc}
\EnableCrossrefs
\CodelineIndex
\RecordChanges
\begin{document}
\DocInput{\jobname.dtx}
\end{document}
%</driver>
% \fi
%
% \def\fileversion{v1.0}
% \def\filedate{2009/10/06}
%
%\title{^^A
% \textsf{democls} --- description text\thanks{^^A
% This file describes version \fileversion, last revised \filedate.^^A
% }^^A
%}
%\author{^^A
% You\thanks{E-mail: [email protected]}^^A
%}
%\date{Released \filedate}
%
%\maketitle
%
%\changes{v1.0}{2009/10/06}{First public release}
%
%\DescribeMacro{\examplemacro}
% Some text about an example macro called \cs{examplemacro}, which
% might have an optional argument \oarg{arg1} and mandatory one
% \marg{arg2}.
%
%\StopEventually{^^A
% \PrintChanges
% \PrintIndex
%}
%
% \begin{macrocode}
%<*class>
% \end{macrocode}
%
% \begin{macrocode}
\ProvidesClass{democls}[2009/10/06 v1.0 description text]
% \end{macrocode}
%
%\begin{macro}{\examplemacro}
%\changes{v1.0}{2009/10/06}{Some change from the previous version}
% \begin{macrocode}
\newcommand*\examplemacro[2][]{%
Some code here, probably
}
% \end{macrocode}
%\end{macro}
%
% \begin{macrocode}
%</class>
% \end{macrocode}
%\Finale
您可以尝试避免重复日期/版本字符串，但总的来说，这样做会产生很多问题，同时也会解决很多问题。因此，我会尽量避免这样做。