# (C) 2010 magicant

# Completion script for the "head" command.
# Supports POSIX 2008, GNU coreutils 8.4, FreeBSD 8.1, OpenBSD 4.8, NetBSD 5.0,
# Mac OS X 10.6.4, SunOS 5.10, HP-UX 11i v3.

function completion/head {

        case $("${WORDS[1]}" --version 2>/dev/null) in
                (*'coreutils'*) typeset type=GNU ;;
                (*)             typeset type="$(uname 2>/dev/null)" ;;
        esac
        case $type in
                (GNU) typeset long=true ;;
                (*)   typeset long= ;;
        esac

        typeset OPTIONS ARGOPT PREFIX
        OPTIONS=( #>#
        "n: ${long:+--lines:}; specify the number of lines to print"
        ) #<#

        case $type in
        (GNU|FreeBSD|NetBSD|Darwin)
                OPTIONS=("$OPTIONS" #>#
                "c: ${long:+--bytes:}; specify the number of bytes to print"
                ) #<#
                case $type in (GNU|NetBSD)
                        OPTIONS=("$OPTIONS" #>#
                        "q ${long:+--quiet --silent}; never print filename headers"
                        "v ${long:+--verbose}; always print filename headers"
                        ) #<#
                        case $type in (GNU)
                                OPTIONS=("$OPTIONS" #>#
                                "--help"
                                "--version"
                                ) #<#
                        esac
                esac
                ;;
        (HP-UX)
                OPTIONS=("$OPTIONS" #>#
                "c; count text in bytes rather than lines"
                ) #<#
                ;;
        esac

        command -f completion//parseoptions ${long:+-es}
        case $ARGOPT in
        (-)
                command -f completion//completeoptions
                ;;
        ([cn]|--bytes|--lines)
                case $type in (GNU)
                        if command -vf completion//prefixdigits >/dev/null 2>&1 ||
                                        . -AL completion/_blocksize; then
                                if command -f completion//prefixdigits; then
                                        command -f completion//completesizesuffix b GNU
                                fi
                        fi
                esac
                ;;
        (*)
                complete -f
                ;;
        esac

}


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