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# bash completion for perl                                 -*- shell-script -*-

_perl_helper()
{
    COMPREPLY=($(compgen -P "$prefix" -W \
        "$(${2:-perl} ${BASH_SOURCE[0]%/*}/../helpers/perl $1 $cur)" \
        -- "$cur"))
    [[ $1 == functions ]] || __ltrim_colon_completions "$prefix$cur"
}

_perl()
{
    local cur prev words cword
    _init_completion -n : || return

    local prefix="" temp optPrefix optSuffix

    # If option not followed by whitespace, reassign prev and cur
    if [[ $cur == -?* ]]; then
        temp=$cur
        prev=${temp:0:2}
        cur=${temp:2}
        if [[ $prev == -d && $cur == t* ]]; then
            prev=-dt
            cur=${cur:1}
        fi
        optPrefix=-P$prev
        optSuffix=-S/
        prefix=$prev

        case $prev in
            -*[DeEiFl])
                return
                ;;
            -*[Ix])
                local IFS=$'\n'
                compopt -o filenames
                COMPREPLY=($(compgen -d $optPrefix $optSuffix -- "$cur"))
                return
                ;;
            -*[mM])
                temp="${cur#-}"
                prefix+="${cur%$temp}"
                cur="$temp"
                _perl_helper modules $1
                return
                ;;
            -*V)
                if [[ $cur == :* ]]; then
                    temp="${cur##+(:)}"
                    prefix+="${cur%$temp}"
                    local IFS=$'\n'
                    COMPREPLY=($(compgen -P "$prefix" -W \
                        '$($1 -MConfig -e "print join \"\\n\",
                           keys %Config::Config" 2>/dev/null)' -- "$temp"))
                    __ltrim_colon_completions "$prefix$temp"
                fi
                return
                ;;
            -*d | -*dt)
                if [[ $cur == :* ]]; then
                    temp="${cur#:}"
                    prefix="$prefix${cur%$temp}"
                    cur="Devel::$temp"
                    _perl_helper modules $1
                fi
                ;;
        esac

    # Unlike other perl options, having a space between the `-e' and
    # `-E' options and their arguments, e.g. `perl -e "exit 2"', is
    # valid syntax.  However, the argument is neither a filename nor a
    # directory, but one line of perl program, thus do not suggest
    # _filedir completion.
    elif [[ $prev == -e ]] || [[ $prev == -E ]]; then
        return

    # Likewise, `-I' also accepts a space between option and argument
    # and it takes a directory as value.
    elif [[ $prev == -I ]]; then
        local IFS=$'\n'
        compopt -o filenames
        COMPREPLY=($(compgen -d ${optPrefix-} ${optSuffix-} -- "$cur"))
        return

    elif [[ $cur == -* ]]; then
        COMPREPLY=($(compgen -W '-C -s -T -u -U -W -X -h -v -V -c -w -d -D -p
            -n -a -F -l -0 -I -m -M -P -S -x -i -e' -- "$cur"))
    else
        _filedir
    fi
} &&
    complete -F _perl perl

_perldoc()
{
    local cur prev words cword
    _init_completion -n : || return

    local prefix="" temp

    # completing an option (may or may not be separated by a space)
    if [[ $cur == -?* ]]; then
        temp=$cur
        prev=${temp:0:2}
        cur=${temp:2}
        prefix=$prev
    fi

    local perl="${1%doc}"
    [[ $perl == "$1" ]] || ! type $perl &>/dev/null && perl=

    case $prev in
        -*[hVnoMwL])
            return
            ;;
        -*d)
            _filedir
            return
            ;;
        -*f)
            _perl_helper functions $perl
            return
            ;;
    esac

    if [[ $cur == -* ]]; then
        COMPREPLY=($(compgen -W '$(_parse_help "$1" -h)' -- "$cur"))
    else
        # return available modules (unless it is clearly a file)
        if [[ $cur != @(*/|[.~])* ]]; then
            _perl_helper perldocs $perl
            if [[ $cur == p* ]]; then
                COMPREPLY+=($(compgen -W \
                    '$(PERLDOC_PAGER=cat "$1" -u perl |  \
                       command sed -ne "/perl.*Perl overview/,/perlwin32/p" | \
                       awk "\$NF=2 && \$1 ~ /^perl/ { print \$1 }")' \
                    -- "$cur"))
            fi
        fi
        _filedir 'p@([lm]|od)'
    fi
} &&
    complete -F _perldoc -o bashdefault perldoc

# ex: filetype=sh