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Re: using dynamic patterns on the left hand side of case statement clauses
On 2020-03-18 at 21:29 -0400, Lawrence Velázquez wrote:
> Search the zshexpn(1) man page for "${~spec}" for a more thorough
> explanation, but the '~' basically turns GLOB_SUBST on for just
> that parameter expansion.
Good stuff, but I'll offer up one refinement: you can turn on GLOB_SUBST
just for the joining pattern, without turning it on for the entire
pattern.
% a=('a*' beta gamma delta)
% c=('alpha', 'a*' 'apple')
% for d in $c; do case $d in
${(j:|:)~a} ) echo "match in a for ${(q-)d}" ;;
*) echo "no match for ${(q-)d}" ;;
esac; done
match in a for alpha,
match in a for 'a*'
match in a for apple
% for d in $c; do case $d in
${(~j:|:)a} ) echo "match in a for ${(q-)d}" ;;
*) echo "no match for ${(q-)d}" ;;
esac; done
no match for alpha,
match in a for 'a*'
no match for apple
You can thank Peter Stephenson for adding the support for that, when I
was asking about implementing set manipulation for arbitrary content
using zsh auto-unique arrays, some years ago now.
-Phil
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