fish-shell/share/functions/__fish_complete_suffix.fish

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#
# Find files that complete $argv[1], has the suffix $argv[2], and
# output them as completions with description $argv[3]
#
function __fish_complete_suffix -d "Complete using files"
set -- comp $argv[1]
set -- suff $argv[2]
set -- desc $argv[3]
set -- base (echo $comp |sed -e 's/\.[a-zA-Z0-9]*$//')
eval "set -- files $base*$suff"
if test $files[1]
printf "%s\t$desc\n" $files
end
#
# Also do directory completion, since there might be files
# with the correct suffix in a subdirectory
#
__fish_complete_directory $comp
end