Acronym, swap description and acronym

Question

I'm using the acronym package. Normally, if I enter an acronym like this:

This is a system with ac{LTI} propertiesSystem. It can be ...

The pdf shows something like this:

This is a system with linear, time invariant (LTI) properties. It can be ...

But I would like to have something like this:

This is a system with LTI (linear, time invariant) properties. It can be ...

How can I set up the acronym package to put the brackets around the description and not around the acronym?

edit:

I tried now using this self defined command:

newcommand{A}[1]{acs{#1} (aclu{#1})}

It shows the acronym first and the long version in brackets. But if I use the same acronym later, the full description ist shown again and again. I would prefer, that it is shown just the first time...

cgnieder · Accepted Answer

In order to generally swap acronym and description one can redefine @acf and acfa for singular forms and @acfp and acfpa for plural forms. Their definitions are

newcommand*{acfa}[1]{%
   texorpdfstring{protect@acf{#1}}{AC@acl{#1} (#1)}}
newcommand*{@acf}[1]{%
    ifAC@footnote
       acsfont{AC@acs{#1}}%
       footnote{AC@placelabel{#1}AC@acl{#1}{}}%
    else
       acffont{%
          AC@placelabel{#1}AC@acl{#1}%
          nolinebreak[3] %
          acfsfont{(acsfont{AC@acs{#1}})}%
        }%
     fi
     ifAC@starredelseAC@logged{#1}fi}

and

newcommand*{acfpa}[1]{%
   texorpdfstring{protect@acfp{#1}}{AC@aclp{#1} (AC@acsp{#1})}}
newcommand*{@acfp}[1]{%
   ifAC@footnote
      acsfont{AC@acsp{#1}}%
      footnote{AC@placelabel{#1}AC@aclp{#1}{}}%
   else
      acffont{%
         AC@placelabel{#1}AC@aclp{#1}%
         nolinebreak[3] %
         acfsfont{(acsfont{AC@acsp{#1}})}%
         }%
   fi
   ifAC@starredelseAC@logged{#1}fi}

The change is rather trivial – exchange short (AC@acs{#1}) and long (AC@acl{#1}) forms and surround the long form with parentheses rather than the short form:

documentclass{article}
usepackage{acronym}

newacro{CSS}{Cascading Style Sheets}
newacro{CD}{Compact Disc}

makeatletter
% singular:
renewcommand*{acfa}[1]{%
  texorpdfstring{protect@acf{#1}}{#1 (AC@acl{#1})}%
}
renewcommand*{@acf}[1]{%
  ifAC@footnote
    acsfont{AC@acs{#1}}%
    footnote{AC@placelabel{#1}AC@acl{#1}{}}%
  else
    acffont{%
      AC@placelabel{#1}%
      acfsfont{acsfont{AC@acs{#1}}}%
      nolinebreak[3] %
      (AC@acl{#1})%
    }%
  fi
  ifAC@starredelseAC@logged{#1}fi
}

% plural:
renewcommand*{acfpa}[1]{%
  texorpdfstring{protect@acfp{#1}}{AC@acsp{#1} (AC@aclp{#1})}
}
renewcommand*{@acfp}[1]{%
  ifAC@footnote
    acsfont{AC@acsp{#1}}%
    footnote{AC@placelabel{#1}AC@aclp{#1}{}}%
  else
    acffont{%
      AC@placelabel{#1}%
      acfsfont{acsfont{AC@acsp{#1}}}%
      nolinebreak[3] %
      (AC@aclp{#1})%
    }%
  fi
  ifAC@starredelseAC@logged{#1}fi
}
makeatother

begin{document}

ac{CSS}

acp{CD}

end{document}

acronymos · Answer

Update for acronym package v1.47 (2020/04/17)
makeatletter
%% singular:
renewcommand*{acfa}[2][AC@linebreakpenalty]{%
   texorpdfstring{protect@acf[#1]{#2}}{#2 (AC@acl{#2})}}
renewcommand*{@acf}[2][AC@linebreakpenalty]{%
    ifAC@footnote
       acsfont{AC@acs{#2}}%
       footnote{AC@placelabel{#2}AC@acl{#2}{}}%
    else
       acffont{%
          AC@placelabel{#2}%             
          acfsfont{acsfont{AC@acs{#2}}}%
          nolinebreak[#1] %
          (AC@acl{#2})%
        }%
     fi
     ifAC@starredelseAC@logged{#2}fi}
makeatother

also as own command acr for using both (normal ac and the reverse one):
makeatletter
newcommand*{acr}{AC@starredfalseprotect@acr}%
newcommand{@acr}[2][AC@linebreakpenalty]{%
  ifAC@dua
     ifAC@starredacl*{#2}elseacl{#2}fi%
  else
     expandafterifxcsname AC@AC@prefix#2endcsnameAC@used%
     ifAC@starredacs*{#2}elseacs{#2}fi%
   else
     acs{#2} (aclu{#2})%
   fi
  fi}
makeatother

Acronym, swap description and acronym

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