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I want it to capitalize the first letter of an expanded acronym used at the start of a sentence, like:

Application programming interfaces (APIs) are ...

I tried to define a new command \Acp for that purpose:

\usepackage[smaller,nohyperlinks]{acronym}
\acro{API}{application programming interface}
\newcommand{\Acp}[1]{\MakeUppercase\expandafter\acp{#1}}

However when I use it, it doesn't work as desired:

\Acp{API} are ...

produces

application programming interfaces (APIs) are ...

Unfortunately I can not use the glossaries package which accomplishes exactly that due to interpackate-incompatibilities.


I had a similar desire in the list of acronyms where I also wanted to capitalize all first letters. There I redefined a different command as suggested in Capitalize the first letter in acronym list:

\makeatletter
\patchcmd{\AC@@acro}{] #3}{] \MakeUppercase #3}{}{}
\patchcmd{\AC@@acro}{] #3}{] \MakeUppercase #3}{}{}
\makeatother

That works.

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What packages are you having a problem with in combination with glossaries? (I think glossaries is probably the best solution to this problem, so I am hoping that one can identify and fix the incompatibilities.) –  mforbes Aug 22 '12 at 16:22
    
A duplicate to this question got more attention, and has an answer that might help, which I extended: tex.stackexchange.com/a/150798/28808 –  Chris H Jan 10 at 9:32
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1 Answer

If you don't mind switching to a relatively new package you could use acro. It naturally provides the command you want:

\documentclass{article}
\usepackage{acro}
\usepackage{relsize}

\acsetup{short-format=\textsmaller}

\DeclareAcronym{API}{
  short = API ,
  long  = application programming interface
}

\begin{document}

\Acp{API}

\printacronyms

\end{document}

enter image description here

Disclaimer: I am the author

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