DESCRIPTION

    fish allows completion of option arguments to come from an external
    command, e.g.:

     % complete -c deluser -l user -d Username -a "(cat /etc/passwd|cut -d : -f 1)"

    The command is supposed to return completion entries one in a separate
    line. Description for each entry can be added, prefixed with a tab
    character. The provided function format_completion() accept a
    completion answer structure and format it for fish. Example:

     format_completion(["a", "b", {word=>"c", description=>"Another letter"}])

    will result in:

     a
     b
     c       Another letter

SEE ALSO

    Complete

    Complete::Bash

    Fish manual.