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Bug Tracker

ID104
StatusClosed (Fixed)
Categorymfirstuc
Version2.01
Summary\capitalisewords fails with commands in non-first word

Report

\capitalisewords works okay when the first word contains a command, but not when subsequent words of the phrase contain commands or grouping. Error message:
! You can't use `macro parameter character #' in math mode.
<recently read> ##

Nicola Talbot

MWE

\documentclass{article}

\usepackage{mfirstuc}

\begin{document}
%\newcommand*{\test}{\textbf{s}ample phrase}% works
%\newcommand*{\test}{\textbf{s}ample p\textbf{h}rase}% doesn't work
%\newcommand*{\test}{\textbf{s}ample {p}hrase}% doesn't work
\newcommand*{\test}{\textbf{s}ample \textbf{p}hrase}% doesn't work

Tagged text: \test.

Title Case: \xcapitalisewords{\test}.

\end{document}

Evaluation

The cause is due to the use of etoolbox's \ifinlist macro, which is only intended for unformatted strings. The same error message is caused by:
\documentclass{article}

\usepackage{etoolbox}

\begin{document}

\newcommand{\testlist}{}

\ifinlist{\textbf{f}oo}{\testlist}{TRUE}{FALSE}.

\end{document}
The remedy is for mfirstuc (or its author, me) to follow the recommendation of the etoolbox manual and use a loop instead of \ifinlist. This will be fixed in the next version of mfirstuc.

Temporary patch for pre v2.02:

\renewcommand*\mfu@checkword[1]{%
  \def\mfu@checkword@arg{#1}%
  \let\@mfu@domakefirstuc\makefirstuc
  \forlistloop\mfu@checkword@do\@mfu@nocaplist
}
\newcommand*{\mfu@checkword@do}[1]{%
 \ifdefstring{\mfu@checkword@arg}{#1}%
 {%
   \let\@mfu@domakefirstuc\@firstofone
   \listbreak
 }%
 {}%
}

Update 2015-12-17: Fixed in version 2.02.

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