# Configuring minipage environment to incorporate width

I'd like to configure tex4ht to set the width of a minipage div class based on the width specified in the LaTeX source. Here's what I have so far:

The tex file is:

\documentclass{article}
\begin{document}
\begin{minipage}[c]{0.6\textwidth}
Some text
\end{minipage}
\hfill
\begin{minipage}[c]{0.3\textwidth}
some more text
\end{minipage}
\end{document}


and my cfg file (with inspiration from https://www.mail-archive.com/tex4ht@tug.org/msg00764.html) is:

\Preamble{html}
\Configure{HtmlPar}
{\EndP\Tg<p>}
{\EndP\Tg<p>}
{\HCode{</p>\Hnewline}}
{\HCode{</p>\Hnewline}}
\ConfigureEnv{minipage}{\ifvmode\IgnorePar\fi\EndP\HCode{<div class="minipage" align="center" style="width:INSERT WIDTH HERE;">}}{\ifvmode\IgnorePar\fi\EndP\HCode{</div>\Hnewline}}{}{}
\Css{div.minipage {
float: left;
margin: 1ex 1em 1ex 0;
}
}
\Css{div.minipage:last-child {
clear: none;
float: right;
margin: 1ex 0 1ex 1em;
}
}
\begin{document}
\EndPreamble


For instance, I'd like the first minipage in the above tex example (with width of 0.6\textwidth) to result in a corresponding div with width 60%. So essentially, referencing this example, I'm looking for a way to:

• extract only the "0.6" from \begin{minipage}[c]{0.6\textwidth}
• multiply 0.6*100 = 60
• insert 60, along with a % sign, into the width of the div

I may be a bit out of my element with this; I've been frantically trying to learn tex4ht and feel I have only a tenuous grasp of most aspects. This community's questions and answers have been tremendously helpful to me, and I'll sincerely appreciate any guidance on this issue.

This is little bit complicated, because minipage is not usual environment, but system of several macros dealing with optional parameters. This is modified cfg file:

\Preamble{html}
\Configure{HtmlPar}
{\EndP\Tg<p>}
{\EndP\Tg<p>}
{\HCode{</p>\Hnewline}}
{\HCode{</p>\Hnewline}}
\makeatletter
% to strip fraction from \textwidth
\def\striptextwidth#1\textwidth{#1}
% we must refer to minipage from the css file, because tags are beeing
% written before we know dimensions
\newcount\mini@count
% save original minipage
\let\oldiimini\@iiiminipage
% redefine minipage
\def\@iiiminipage#1#2[#3]#4{%
% calculate dimensions and save it to macro
\xdef\miniwidth{\strip@pt\dimexpr(\striptextwidth#4pt)*100\relax\%}
\oldiimini{#1}{#2}[#3]{#4}
}

\ConfigureEnv{minipage}{\advance\mini@count by 1\relax\ifvmode\IgnorePar\fi\EndP\HCode{<div class="minipage" align="center" id="minipage\the\mini@count" style="border:1px solid black;">}}
{\ifvmode\IgnorePar\fi\EndP\HCode{</div>\Hnewline}%
% we must write dimension here to the css file
\Css{\#minipage\the\mini@count{width:\miniwidth;}}%
}{}{}
\makeatother
\Css{div.minipage {
float: left;
margin: 1ex 1em 1ex 0;
}
}
\Css{div.minipage:last-child {
clear: none;
float: right;
margin: 1ex 0 1ex 1em;
}
}
\begin{document}
\EndPreamble


we can get all minipage parameters from \@iiiminipage macro, so we have to redefine it, strip \textwidth from parameter with width, calculate percents and save it to a macro so we can use it later.

Unfortunately, we can't use this calculated value directly in opening tag, because these are written before @iiiminipage is called, so we must generate unique id attribute for each minipage and write width to the css file.

Result with borders:

• This is terrific, thank you very much, the solution is much more sophisticated than I thought and was beyond my current capabilities. I was hoping to avoid writing to the css file (because in practice I use a different, global css file) but it's just as well because I encountered a similar situation (reconciling the tex4ht-generated css file with my own css file) in the context of the tabular environment. Thus this solution has helped me solve not one but two issues; thanks again. – user59959 Aug 7 '14 at 16:36
• @user59959 your welcome, I am happy that this helped you. you can use multiple css files with tex4ht, one generated by tex4ht and the other dealing with design and typography, for example – michal.h21 Aug 7 '14 at 17:34
• @michal.h21 I have the problem that with this cfg, the text after the minipage does not go to a new line, but start on a third column. How do I prevent this? please, check my question tex.stackexchange.com/questions/229905/… – simona Feb 24 '15 at 14:14