Can i make a macro in a class file that take a string like argument and call a local macro? I want to make the following:
\newcommand{\somename}{\def\@somename{#1}} \newcommand{\warning}[1] { \ifthenelse {\isundefined{\@#1}} {You have to define #1. Use this macro: \textbackslash#1} {} } \AtBeginDocument {\warning{somename}} Then, if in the document file i didnt define \@somename i will have a warning saying that to me.
Any ideas?
The LaTeX kernel already provides this:
\makeatletter % not in a class or package file \newcommand{\warning}[1]{% \@ifundefined{@#1} {You have to define '#1'. Use this macro: \texttt{\symbol{`\\}#1}} {}% } \newcommand{\somename}[1]{\def\@somename{#1}} \makeatother % not in a class or package file \AtBeginDocument{\warning{somename}} Note that the first argument to \@ifundefined should be a string of characters representing the macro name (no initial backslash).
I would use the etoolbox pacakge:
\documentclass{article} \usepackage{etoolbox} \newcommand*{\DefinePerson}[1]{\csdef{#1}{}} \newcommand*{\Warning}[1]{% \ifcsdef{#1}{}{% You have to define #1. Use the macro {\ttfamily\string\DefinePerson}.% }% }% \DefinePerson{Steve Jobs} \DefinePerson{Bill Gates} \AtBeginDocument{% \Warning{Steve Jobs}% \Warning{Warren Buffet}% }% \begin{document} \par Hi there \end{document} 
\csname @#1\endcsname\@datethen be used, for example?\makeatletter\newcommand{\warning}[1]{\@ifundefined{@#1}{Booo!!!}{Yay!!!}}\makeatother? That's what\@ifundefinedis made for...\@somenameas the warning and do the redefinition with\somenameto have the real string instead of the former warning.