Create a macro with optional argument that add a letter

Question

I would like to add an optional argument to my macro

\documentclass[french]{article} \usepackage[T1]{fontenc} \usepackage[utf8]{inputenc} \usepackage{lmodern} \usepackage[a4paper]{geometry} \usepackage{babel} \NewDocumentCommand{\cpm}{ O {continue par morceaux} m }{continues par morceaux } \begin{document} Singular \cpm{}, Plural \cpm{s} \end{document}

Result wanted is :

Singular continue par morceaux, Plural continues par morceaux

What I have currently is :

Singular continues par morceaux, Plural continues par morceaux

I guess you want \NewDocumentCommand{\cpm}{s}{continue\IfBooleanT{#1}{s} par morceaux} to be used as \cpm{} or \cpm* — egreg
– egreg, Commented Jan 2 at 15:09

Mico · Accepted Answer · 2025-01-02 15:18:12Z

Here's a solution that uses the "classic LaTeX" \newcommand directive to define \cpm. Note that in "classic LaTeX" syntax an optional argument, if provided, must be encased in square brackets, not curly braces.

\documentclass[french]{article} \usepackage[T1]{fontenc} %\usepackage[utf8]{inputenc} % that's the default nowadays \usepackage{babel} \usepackage{lmodern} \usepackage[a4paper]{geometry} \newcommand{\cpm}[1][]{continue#1 par morceaux} \begin{document} Singular: \cpm; plural: \cpm[s]. \end{document}

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Create a macro with optional argument that add a letter

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