tips of Latex 如何确定某个宏定义的位置

我们在排错的时候，经常希望知道出错的宏是在哪里定义的，然后通过比对定义和现有情况判断错误原因。

LeoLiu 在 TeX.SX 给出了一个利用

filehook

宏包实现的方法，效果拔群！当然，方法有些讨巧。

代码：

\documentclass{article}
\usepackage{filehook,currfile}
\newwrite\finder
\immediate\openout\finder=\jobname.fnd

\def\searchmacro#1{
\AtBeginOfFiles{\ifdefined#1
\expandafter\def\csname \currfilename:found\endcsname{}%
\fi}
\AtEndOfFiles{\ifdefined#1
\unless\ifcsname \currfilename:found\endcsname
\immediate\write\finder{found in '\currfilename'}%
\fi\fi}}

\searchmacro\url

\usepackage{hyperref}
\begin{document}
dummy
\end{document}

编译后，在

\jobname.fnd

里我们能找到

found in 'url.sty'
found in 'hyperref.sty'

也就是说，

\url

是在

url.sty

里定义的，而

url.sty

被

hyperref.sty

调用。

We would be glad to know where a certain macro is defined, when we are debugging. LeoLiu provided a method by using the package

filehook

, on the website TeX.SX. It’s really great!

The code is somewhat tricky:

\documentclass{article}
\usepackage{filehook,currfile}
\newwrite\finder
\immediate\openout\finder=\jobname.fnd

\def\searchmacro#1{
\AtBeginOfFiles{\ifdefined#1
\expandafter\def\csname \currfilename:found\endcsname{}%
\fi}
\AtEndOfFiles{\ifdefined#1
\unless\ifcsname \currfilename:found\endcsname
\immediate\write\finder{found in '\currfilename'}%
\fi\fi}}

\searchmacro\url

\usepackage{hyperref}
\begin{document}
dummy
\end{document}

After compiling, we will get

found in 'url.sty'
found in 'hyperref.sty'

in

\jobname.fnd

. That is to say,

\url

is defined in

url.sty

, which is inputed by

hyperref.sty

.

选自：http://liam0205.me/LaTeX-How-to-find-out-where-a-macro-is-defined/