(m4.info)Conditionals
6 Conditionals, loops, and recursion
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Macros, expanding to plain text, perhaps with arguments, are not quite
enough. We would like to have macros expand to different things, based
on decisions taken at run-time. For that, we need some kind of
conditionals. Also, we would like to have some kind of loop construct,
so we could do something a number of times, or while some condition is
true.
Ifdef- Testing if a macro is defined
Ifelse- If-else construct, or multibranch
Shift- Recursion in 'm4'
Forloop- Iteration by counting
Foreach- Iteration by list contents
Stacks- Working with definition stacks
Composition- Building macros with macros
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