Cfrgtkky

I was trying to make a section style with uppercase fonts and color. But when I use MakeUppercase like

makeatletter

renewcommand{@seccntformat}[1]{{textcolor{purple}{csname the#1endcsname}hspace{1em}}}                    

renewcommand{section}{@startsection{section}{1}{z@}

{-4ex @plus -1ex @minus -.4ex}

{1ex @plus.2ex }

{normalfontlargesffamilybfseriesMakeUppercasecolor{purple}}}

The following errors are shown

Argument of @declaredcolor has an extra }. section{}

If you swap the order of MakeUppercase and color{purple} it works. Internally, the sectioning commands do (approximately) this:

<formatting>{@seccntformat{<number>} <title>}

where <formatting> is the last argument of @startsection, <number> is the section number and <title>, you guessed, the title :)

If we do like you suggested, section{hello} becomes:

normalfontlargesffamilybfseriesMakeUppercasecolor{purple}{1 hello}

(@seccntformat is not important right now). Try running the above and you'll see the same error. That happens because MakeUppercase grabs color as argument and when color tries to do its thing it won't find the droids color name it was looking for and chaos will ensue. But if you swap the order it works :)

normalfontlargesffamilybfseriescolor{purple}MakeUppercase{1 hello}

But now you'll get another error:

! Package xcolor Error: Undefined color `PURPLE'.

but why?! Remember the @seccntformat back then? You had:

<formatting>{@seccntformat{<number>} <title>}

when <formatting> contains MakeUppercase and @seccntformat contains textcolor{purple}{<number>}, then you have:

MakeUppercase{textcolor{purple}{<number>} <title>}

which will MakeUppercase before textcolor is executed:

{textcolor{PURPLE}{<NUMBER>} <TITLE>}

Yes, the NUMBER too :)

But you don't need that. The counter is used after the color{purple}, so it will already be coloured. You can remove that and the number will be purple too. If you take that out, your definition of @seccntformat is identical to LaTeX's one, so you can remove it altogether.

After all this the output is:

MWE:

documentclass{article}



usepackage{xcolor}



makeatletter

% renewcommand{@seccntformat}[1]{csname the#1endcsnamehspace{1em}} == default :)

renewcommand{section}{@startsection{section}{1}{z@}

{-4ex @plus -1ex @minus -.4ex}

{1ex @plus.2ex }

{normalfontlargesffamilybfseriescolor{purple}MakeUppercase}}

makeatother



begin{document}

pagestyle{empty}



section{Hello}



Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod

tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,

quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo

consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse

cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non

proident, sunt in culpa qui officia deserunt mollit anim id est laborum.



end{document}