[Tex/LaTex] Acronym upper/lower/mixed case, and pluralisation

Question

My question is really a further question of this post.

I've used the following code from there in my tex doc.:

    \documentclass{article}
    \usepackage{acronym}
    \usepackage{etoolbox}
    \makeatletter
    \newif\if@in@acrolist
    \AtBeginEnvironment{acronym}{\@in@acrolisttrue}
    \newrobustcmd{\LU}[2]{\if@in@acrolist#1\else#2\fi}

    \newcommand{\ACF}[1]{{\@in@acrolisttrue\acf{#1}}}
    \makeatother

    \begin{document}
    \begin{acronym}
    \acro{SRS}{\LU{S}{s}patial \LU{R}{r}eference \LU{S}{s}ystem}
    \acro{DC}{\LU{D}{d}irect \LU{C}{c}urrent}
    \end{acronym}

    Batteries run on \ac{DC} and \ac{SRS} are different things.
    \end{document}

This works great. But what happens if you would normally want the acronym lower case but, since it appears at the start of a sentence, you want only the first letter of the first word to be capitalised?

I'm now using the same code fragments as above, but when I start the sentence with:

\ac{dc} lorum impsom...

It gives me:

direct current lorum impsom...

instead of:

Direct current lorum impsom...

Is this an easy fix?

FYI, I've already tried \Ac{} or \Acp{} but they didn't work. I suspect I need to create a new command, but I don't know how, which is why I'm coming to you lovely people.

Further, I'm having issues with pluralisation. If I want to pluralise something, I would normally use the \acp{} command. However, if I want capitals AND pluralisation, \ACP{} doesn't work.

Answer 1

One possibility would be to switch to the acro package. It provides what you need:

\documentclass{article}
\usepackage{acro}
\acsetup{list-long-format=\capitalisewords}
\usepackage{mfirstuc}% provides \capitalisewords

\DeclareAcronym{SRS}{
  short = SRS ,
  long  = spatial reference system
}
\DeclareAcronym{DC}{
  short = DC ,
  long  = direct current
}

\begin{document}

Batteries run on \ac{DC} and \ac{SRS} are different things.
Batteries run on \ac{DC} and \ac{SRS} are different things.

\Acl{DC} bla ...

\printacronyms

\end{document}