Since it seems that the LaTeX convention is to use globally scoped instead of locally scoped commands/environments (which makes sense now for a complex reason), I am wondering how to handle the case where I want two different implementations of the same command/environment name.
For example, say I have this:
\NewDocumentEnvironment{myenva}{} {
\NewDocumentCommand{\mycmd}{m} {
}
}
\NewDocumentEnvironment{myenvb}{} {
\NewDocumentCommand{\mycmd}{m} {
}
}
Instead of writing that as nested, I would write it as something like:
\NewDocumentCommand{\mycmd}{} {
\if environment is myenva {
\typeout{myenva}
}
\if environment is myenvb {
\typeout{myenvb}
}
\else {
throw error This needs to be in myenva or myenvb.
}
}
\NewDocumentEnvironment{myenva}{} {
}
\NewDocumentEnvironment{myenvb}{} {
}
The following is a MWE:
\documentclass[a4paper]{article}
\usepackage[english]{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{expl3}
\usepackage{xparse}
\ExplSyntaxOn
\NewDocumentCommand{\mycmd}{} {
\if environment is myenva {
\typeout{myenva}
}
\if environment is myenvb {
\typeout{myenvb}
}
\else {
\PackageError{mypackage}{This needs to be in myenva or myenvb.}{}
}
}
\NewDocumentEnvironment{myenva}{} {
}
\NewDocumentEnvironment{myenvb}{} {
}
\begin{document}
\begin{myenva}
Hello
\mycmd{}
\end{myenva}
\begin{myenvb}
world
\mycmd{}
\end{myenvb}
\end{document}
Wondering if this is the right approach, and how to get it working (i.e. checking that it is in the correct environment). Another approach would be to reopen the command definition if that's possible in LaTeX3, so it would be slightly cleaner / have separation of concerns.
\NewDocumentCommand{\mycmd}{} {
\if environment is myenva {
\typeout{myenva}
}
}
% something along these lines:
\RenewDocumentCommand{\mycmd}{}{
\super{}
\if environment is myenvb {
\typeout{myenvb}
}
}
Not sure the way to get this working (how to check for the right environment). Also I've read somewhere that potentially throwing an error if it's the wrong environment might be a good option, so wasn't sure if I should include that. Might be useful for debugging and making it more robust.
Also, I would like to avoid having to pass around the environment name, such as like this:
\mycmd{myenva}
\mycmd{myenvb}
