#compdef comm

autoload -U is-at-least

_comm() {
    typeset -A opt_args
    typeset -a _arguments_options
    local ret=1

    if is-at-least 5.2; then
        _arguments_options=(-s -S -C)
    else
        _arguments_options=(-s -C)
    fi

    local context curcontext="$curcontext" state line
    _arguments "${_arguments_options[@]}" : \
'*--output-delimiter=[separate columns with STR]:STR:_default' \
'-1[suppress column 1 (lines unique to FILE1)]' \
'-2[suppress column 2 (lines unique to FILE2)]' \
'-3[suppress column 3 (lines that appear in both files)]' \
'-z[line delimiter is NUL, not newline]' \
'--zero-terminated[line delimiter is NUL, not newline]' \
'--total[output a summary]' \
'--check-order[check that the input is correctly sorted, even if all input lines are pairable]' \
'(--check-order)--nocheck-order[do not check that the input is correctly sorted]' \
'-h[Print help]' \
'--help[Print help]' \
'-V[Print version]' \
'--version[Print version]' \
':FILE1:_files' \
':FILE2:_files' \
&& ret=0
}

(( $+functions[_comm_commands] )) ||
_comm_commands() {
    local commands; commands=()
    _describe -t commands 'comm commands' commands "$@"
}

if [ "$funcstack[1]" = "_comm" ]; then
    _comm "$@"
else
    compdef _comm comm
fi
