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# umount(8) completion                                     -*- shell-script -*-

# Just like COMPREPLY=(`compgen -W "${COMPREPLY[*]}" -- "$cur"`), only better!
#
# This will correctly escape special characters in COMPREPLY.
_reply_compgen_array()
{
    # Create the argument for compgen -W by escaping twice.
    #
    # One round of escape is because we want to reply with escaped arguments. A
    # second round is required because compgen -W will helpfully expand it's
    # argument.
    local i wlist
    for i in ${!COMPREPLY[*]}; do
        local q=$(quote "$(printf %q "${COMPREPLY[$i]}")")
        wlist+=$q$'\n'
    done

    # We also have to add another round of escaping to $cur.
    local ecur="$cur"
    ecur="${ecur//\\/\\\\}"
    ecur="${ecur//\'/\'}"

    # Actually generate completions.
    local oldifs=$IFS
    IFS=$'\n' eval 'COMPREPLY=(`compgen -W "$wlist" -- "${ecur}"`)'
    IFS=$oldifs
}

# Unescape strings in the linux fstab(5) format (with octal escapes).
__linux_fstab_unescape() {
    eval $1="'${!1//\'/\047}'"
    eval $1="'${!1/%\\/\\\\}'"
    eval "$1=$'${!1}'"
}

# Complete linux fstab entries.
#
# Reads a file from stdin in the linux fstab(5) format; as used by /etc/fstab
# and /proc/mounts.
_linux_fstab()
{
    COMPREPLY=()

    # Read and unescape values into COMPREPLY
    local fs_spec fs_file fs_other
    local oldifs="$IFS"
    while read -r fs_spec fs_file fs_other; do
        if [[ $fs_spec = [#]* ]]; then continue; fi
        if [[ $1 == -L ]]; then
            local fs_label=${fs_spec/#LABEL=}
            if [[ $fs_label != "$fs_spec" ]]; then
                __linux_fstab_unescape fs_label
                IFS=$'\0'
                COMPREPLY+=("$fs_label")
                IFS=$oldifs
            fi
        else
            __linux_fstab_unescape fs_spec
            __linux_fstab_unescape fs_file
            IFS=$'\0'
            [[ $fs_spec = */* ]] && COMPREPLY+=("$fs_spec")
            [[ $fs_file = */* ]] && COMPREPLY+=("$fs_file")
            IFS=$oldifs
        fi
    done

    # Add relative paths to COMPREPLY
    if [[ $cur && $cur != /* ]]; then
        local realcur
        [[ $cur == */ ]] && # don't let readlink drop last / from path
            realcur="$( readlink -f "$cur." 2> /dev/null )/" ||
            realcur=$( readlink -f "$cur" 2> /dev/null )
        if [[ $realcur ]]; then
            local dirrealcur= dircur= basecur
            if [[ $cur == */* ]]; then
               dirrealcur="${realcur%/*}/"
               dircur="${cur%/*}/"
            fi
            basecur=${cur#"$dircur"}
            local i n=${#COMPREPLY[@]}
            for (( i=0; i < $n; i++ )); do
                [[ "${COMPREPLY[i]}" == "$realcur"* ]] &&
                    COMPREPLY+=( $( cd "$dircur" 2> /dev/null &&
                        compgen -f -d -P "$dircur" \
                        -X "!${COMPREPLY[i]##"$dirrealcur"}" -- "$basecur" ) )
            done
        fi
    fi

    _reply_compgen_array
}

_umount()
{
    local cur prev words cword
    _init_completion || return

    case "$prev" in
        -t)
            # FIXME: no<fstype>
            local split=false
            if [[ "$cur" == ?*,* ]]; then
                prev="${cur%,*}"
                cur="${cur##*,}"
                split=true
            fi
            COMPREPLY=( $( compgen -W 'adfs affs autofs btrfs cifs coda
                cramfs debugfs devpts efs ext2 ext3 ext4 fuse hfs hfsplus hpfs
                iso9660 jfs minix msdos ncpfs nfs nfs4 ntfs ntfs-3g proc qnx4
                ramfs reiserfs romfs squashfs smbfs sysv tmpfs ubifs udf ufs
                umsdos usbfs vfat xfs' -- "$cur" ) )
            _fstypes
            $split && COMPREPLY=( ${COMPREPLY[@]/#/$prev,} )
            return
            ;;
        -O)
            # argument required but no completions available
            return
            ;;
    esac

    if [[ "$cur" == -* ]]; then
        COMPREPLY=( $( compgen -W '-V -h -v -n -r -d -i -a -t -O -f -l
            --no-canonicalize --fake' -- "$cur" ) )
        [[ $COMPREPLY ]] && return
    fi

    if [[ -r /proc/mounts ]]; then
        # Linux /proc/mounts is properly quoted. This is important when
        # unmounting usb devices with pretty names.
        _linux_fstab < /proc/mounts
    else
        local IFS=$'\n'
        COMPREPLY=( $( compgen -W '$( mount | cut -d" " -f 3 )' -- "$cur" ) )
    fi
} &&
complete -F _umount -o dirnames umount

# ex: ts=4 sw=4 et filetype=sh