fish-shell/share/functions/__fish_complete_directory.fish

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#
# Find directories that complete $argv[1], output them as completions
# with description $argv[2] if defined, otherwise use 'Directory'
#
function __fish_complete_directory -d "Complete using directories"
set -- comp $argv[1]
set -- desc (_ Directory)
if test (count $argv) -gt 1
set desc $argv[2]
end
eval "set -- dirs "$comp"*/"
if test $dirs[1]
printf "%s\t$desc\n" $dirs
end
end