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#
# Bash completion for grub
#
# Copyright (C) 2010  Free Software Foundation, Inc.
#
# GRUB is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# GRUB is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
# bash completion for grub

__grub_dir() {
    local i c=1 boot_dir

    for (( c=1; c <= ${#COMP_WORDS[@]}; c++ )); do
        i="${COMP_WORDS[c]}"
        case "$i" in
            --boot-directory)
                c=$((++c))
                i="${COMP_WORDS[c]}"
                boot_dir="${i##*=}";
                break
                ;;
        esac
    done
    boot_dir=${boot_dir-/boot}
    echo "${boot_dir%/}/grub"
}


# This function generates completion reply with compgen
# - arg: accepts 1, 2, 3, or 4 arguments
#        $1 wordlist separate by space, tab or newline
#        $2 (optional) prefix to add
#        $3 (optional) current word to complete
#        $4 (optional) suffix to add
__grubcomp () {
    local cur="${COMP_WORDS[COMP_CWORD]}"
    if [ $# -gt 2 ]; then
        cur="$3"
    fi
    case "$cur" in
    --*=)
        COMPREPLY=()
        ;;
    *)
        local IFS=' '$'\t'$'\n'
        COMPREPLY=($(compgen -P "${2-}" -W "${1-}" -S "${4-}" -- "$cur"))
        ;;
    esac
}

# Function that return long options from the help of the command
# - arg: $1 (optional) command to get the long options from
__grub_get_options_from_help () {
     local prog

     if [ $# -ge 1 ]; then
         prog="$1"
     else
         prog="${COMP_WORDS[0]}"
     fi

     local i IFS=" "$'\t'$'\n'
     for i in $(LC_ALL=C $prog --help)
     do
        case $i in
             --*) echo "${i%=*}";;
         esac
     done
}

# Function that return long options from the usage of the command
# - arg: $1 (optional) command to get the long options from
__grub_get_options_from_usage () {
     local prog

     if [ $# -ge 1 ]; then
         prog="$1"
     else
         prog="${COMP_WORDS[0]}"
     fi

     local i IFS=" "$'\t'$'\n'
     for i in $(LC_ALL=C $prog --usage)
     do
        case $i in
            \[--*\]) i=${i#[}           # Remove leading [
                     echo ${i%%?(=*)]}  # Remove optional value and trailing ]
                     ;;
         esac
     done
}

__grub_get_last_option () {
    local i
    for (( i=$COMP_CWORD-1; i > 0; i-- )); do
        if [[ "${COMP_WORDS[i]}" == -* ]]; then
            echo "${COMP_WORDS[i]}"
            break;
        fi
    done
}

__grub_list_menuentries () {
    local cur="${COMP_WORDS[COMP_CWORD]}"
    local config_file=$(__grub_dir)/grub.cfg

    if [ -f "$config_file" ];then
        local IFS=$'\n'
        COMPREPLY=( $(compgen \
            -W "$( awk -F "[\"']" '/menuentry/ { print $2 }' $config_file )" \
            -- "$cur" )) #'# Help emacs syntax highlighting
    fi
}

__grub_list_modules () {
    local grub_dir=$(__grub_dir)
    local IFS=$'\n'
    COMPREPLY=( $( compgen -f -X '!*/*.mod' -- "${grub_dir}/$cur" | {
         while read -r tmp; do
             [ -n $tmp ] && {
                 tmp=${tmp##*/}
                 printf '%s\n' ${tmp%.mod}
             }
         done
         }
        ))
}

#
# grub-set-default & grub-reboot
#
_grub_set_entry () {
    local cur prev split=false

    COMPREPLY=()
    cur=`_get_cword`
    prev=${COMP_WORDS[COMP_CWORD-1]}

    _split_longopt && split=true

    case "$prev" in
        --boot-directory)
            _filedir -d
            return
            ;;
    esac

    $split && return 0

    if [[ "$cur" == -* ]]; then
        __grubcomp "$(__grub_get_options_from_help)"
    else
        # Default complete with a menuentry
        __grub_list_menuentries
    fi
}

__grub_set_default_program="grub-set-default"
complete -F _grub_set_entry -o filenames ${__grub_set_default_program}
unset __grub_set_default_program

__grub_reboot_program="grub-reboot"
complete -F _grub_set_entry -o filenames ${__grub_reboot_program}
unset __grub_reboot_program


#
# grub-editenv
#
_grub_editenv () {
    local cur prev

    COMPREPLY=()
    cur=`_get_cword`
    prev=${COMP_WORDS[COMP_CWORD-1]}

    case "$prev" in
        create|list|set|unset)
            COMPREPLY=( "" )
            return
            ;;
    esac

    __grubcomp "$(__grub_get_options_from_help)
                create list set unset"
}

__grub_editenv_program="grub-editenv"
complete -F _grub_editenv -o filenames ${__grub_editenv_program}
unset __grub_editenv_program


#
# grub-mkconfig
#
_grub_mkconfig () {
    local cur prev

    COMPREPLY=()
    cur=`_get_cword`

    if [[ "$cur" == -* ]]; then
        __grubcomp "$(__grub_get_options_from_help)"
    else
        _filedir
    fi
}
__grub_mkconfig_program="grub-mkconfig"
complete -F _grub_mkconfig -o filenames ${__grub_mkconfig_program}
unset __grub_mkconfig_program


#
# grub-setup
#
_grub_setup () {
    local cur prev split=false

    COMPREPLY=()
    cur=`_get_cword`
    prev=${COMP_WORDS[COMP_CWORD-1]}

    _split_longopt && split=true

    case "$prev" in
        -d|--directory)
            _filedir -d
            return
            ;;
    esac

    $split && return 0

    if [[ "$cur" == -* ]]; then
        __grubcomp "$(__grub_get_options_from_help)"
    else
        # Default complete with a filename
        _filedir
    fi
}

__grub_bios_setup_program="grub-bios-setup"
complete -F _grub_setup -o filenames ${__grub_bios_setup_program}
unset __grub_bios_setup_program

__grub_sparc64_setup_program="grub-sparc64-setup"
complete -F _grub_setup -o filenames ${__grub_sparc64_setup_program}
unset __grub_sparc64_setup_program


#
# grub-install
#
_grub_install () {
    local cur prev last split=false

    COMPREPLY=()
    cur=`_get_cword`
    prev=${COMP_WORDS[COMP_CWORD-1]}
    last=$(__grub_get_last_option)

    _split_longopt && split=true

    case "$prev" in
        --boot-directory)
            _filedir -d
            return
            ;;
        --disk-module)
            __grubcomp "biosdisk ata"
            return
            ;;
    esac

    $split && return 0

    if [[ "$cur" == -* ]]; then
        __grubcomp "$(__grub_get_options_from_help)"
    else
        case "$last" in
            --modules)
                __grub_list_modules
                return
                ;;
        esac

        # Default complete with a filename
        _filedir
    fi
}
__grub_install_program="grub-install"
complete -F _grub_install -o filenames ${__grub_install_program}
unset __grub_install_program


#
# grub-mkfont
#
_grub_mkfont () {
    local cur

    COMPREPLY=()
    cur=`_get_cword`

    if [[ "$cur" == -* ]]; then
        __grubcomp "$(__grub_get_options_from_help)"
    else
        # Default complete with a filename
        _filedir
    fi
}
__grub_mkfont_program="grub-mkfont"
complete -F _grub_mkfont -o filenames ${__grub_mkfont_program}
unset __grub_mkfont_program


#
# grub-mkrescue
#
_grub_mkrescue () {
    local cur prev last

    COMPREPLY=()
    cur=`_get_cword`
    prev=${COMP_WORDS[COMP_CWORD-1]}
    last=$(__grub_get_last_option)

    if [[ "$cur" == -* ]]; then
        __grubcomp "$(__grub_get_options_from_help)"
    else
        case "$last" in
            --modules)
                __grub_list_modules
                return
                ;;
        esac

        # Default complete with a filename
        _filedir
    fi
}
__grub_mkrescue_program="grub-mkrescue"
complete -F _grub_mkrescue -o filenames ${__grub_mkrescue_program}
unset __grub_mkrescue_program


#
# grub-mkimage
#
_grub_mkimage () {
    local cur prev split=false

    COMPREPLY=()
    cur=`_get_cword`
    prev=${COMP_WORDS[COMP_CWORD-1]}

    _split_longopt && split=true

    case "$prev" in
        -d|--directory|-p|--prefix)
            _filedir -d
            return
            ;;
        -O|--format)
            # Get available format from help
            local prog=${COMP_WORDS[0]}
            __grubcomp "$(LC_ALL=C $prog --help | \
                        awk -F ":" '/available formats/ { print $2 }' | \
                        sed 's/, / /g')"
            return
            ;;
    esac

    $split && return 0

    if [[ "$cur" == -* ]]; then
        __grubcomp "$(__grub_get_options_from_help)"
    else
        # Default complete with a filename
        _filedir
    fi
}
__grub_mkimage_program="grub-mkimage"
complete -F _grub_mkimage -o filenames ${__grub_mkimage_program}
unset __grub_mkimage_program


#
# grub-mkpasswd-pbkdf2
#
_grub_mkpasswd_pbkdf2 () {
    local cur

    COMPREPLY=()
    cur=`_get_cword`

    if [[ "$cur" == -* ]]; then
        __grubcomp "$(__grub_get_options_from_help)"
    else
        # Default complete with a filename
        _filedir
    fi
}
__grub_mkpasswd_pbkdf2_program="grub-mkpasswd-pbkdf2"
complete -F _grub_mkpasswd_pbkdf2 -o filenames ${__grub_mkpasswd_pbkdf2_program}
unset __grub_mkpasswd_pbkdf2_program


#
# grub-probe
#
_grub_probe () {
    local cur prev split=false

    COMPREPLY=()
    cur=`_get_cword`
    prev=${COMP_WORDS[COMP_CWORD-1]}

    _split_longopt && split=true

    case "$prev" in
        -t|--target)
            # Get target type from help
            local prog=${COMP_WORDS[0]}
            __grubcomp "$(LC_ALL=C $prog --help | \
                        awk -F "[()]" '/--target=/ { print $2 }' | \
                        sed 's/|/ /g')"
            return
            ;;
    esac

    $split && return 0

    if [[ "$cur" == -* ]]; then
        __grubcomp "$(__grub_get_options_from_help)"
    else
        # Default complete with a filename
        _filedir
    fi
}
__grub_probe_program="grub-probe"
complete -F _grub_probe -o filenames ${__grub_probe_program}
unset __grub_probe_program


#
# grub-script-check
#
_grub_script_check () {
    local cur

    COMPREPLY=()
    cur=`_get_cword`

    if [[ "$cur" == -* ]]; then
        __grubcomp "$(__grub_get_options_from_help)"
    else
        # Default complete with a filename
        _filedir
    fi
}
__grub_script_check_program="grub-script-check"
complete -F _grub_script_check -o filenames ${__grub_script_check_program}


# Local variables:
# mode: shell-script
# sh-basic-offset: 4
# sh-indent-comment: t
# indent-tabs-mode: nil
# End:
# ex: ts=4 sw=4 et filetype=sh