zsh/Completion/Linux/Command/_findmnt

#compdef findmnt
#
# Note for customization:
#   Options -N -k -m -s are in a group 'S' and need be specified as
#   'S-option-N' etc. in the context for zstyle. For example, if you want
#   all PIDs to be completed for 'findmnt -N<TAB>', then
#     zstyle ':completion:*:findmnt:S-option-N-1:processes' command 'ps -A'
#
local curcontext=$curcontext state state_descr line ret=1
typeset -A opt_args

_arguments -s -C \
  '(H -A --all)'{-A,--all}'[print all filesystems]' \
  '(H -a --ascii)'{-a,--ascii}'[use ascii characters for tree formatting]' \
  '(H -b --bytes)'{-b,--bytes}'[print SIZE etc. in bytes]' \
  '(H -c --nocanonicalize)'{-c,--nocanonicalize}'[do not canonicalize path]' \
  '(H -d --direction)'{-d+,--direction=}'[specify the search direction]:direction:(forward backward)' \
  '(H -e --evaluate)'{-e,--evaluate}'[convert LABEL/UUID/PARTLABEL/PARTUUID to the device name]' \
  '(H -F --tab-file)*'{-F+,--tab-file=}'[search in the specified tab file]:tab file:_files' \
  '(H -f --first-only)'{-f,--first-only}'[print the first matching filesystem only]' \
  '(H -i --invert)'{-i,--invert}'[invert the sense of matching]' \
  '(H -M --mountpoint :)'{-M+,--mountpoint=}'[specify the mountpoint]: :->targets' \
  '(H -n --noheadings)'{-n,--noheadings}'[do not print a header line]' \
  '(H -O --options)'{-O+,--options=}'[only print the filesystems with the specified options]:list of options: ' \
  '(H -o --output --output-all)'{-o+,--output=}'[specify output columns]: :->columns' \
  '(H -o --output)--output-all[output all available columns]' \
  '(H -p --poll)'{-p+,--poll=}'[monitor changes in /proc/self/mountinfo]::action:(mount umount remount move)' \
  '(H --real)--pseudo[print only pseudo-filesystems]' \
  '(H)--shadowed[print only filesystems over-mounted by another filesystem]' \
  '(H -R --submounts)'{-R,--submounts}'[print recursively all submounts]' \
  '(H --pseudo)--real[print only real filesystems]' \
  '(H -S --source :)'{-S+,--source=}'[specify the mount source]: :->sources' \
  '(H -T --target :)'{-T+,--target=}'[specify the mount target]:target:_files' \
  '(H -t --types)'{-t+,--types=}'[specify the type of filesystems]:filesystem types:_sequence -s , _file_systems' \
  '--tree[use tree-like output if possible]' \
  '(H -U --uniq)'{-U,--uniq}'[ignore filesystems with duplicated mount targets]' \
  '(H -u --notruncate)'{-u,--notruncate}'[do not truncate text in columns]' \
  '(H -v --nofsroot)'{-v,--nofsroot}'[do not print \[/dir\] in the SOURCE column]' \
  '(H -y --shell -n --noheadings)'{-y,--shell}'[use column names usable as shell variable identifiers]' \
  '(H -w --timeout)'{-w+,--timeout}'[specify timeout for --poll]:milliseconds: ' \
  '(H -x --verify)'{-x,--verify}'[check mount table content]' \
  '(H)--verbose[print more information]' \
  '(H)--vfs-all[print all VFS options]' \
  '(H)1: :->sources_targets' \
  '(H)2:: :->targets' \
  + '(format)' \
  '(H)'{-D,--df}'[imitate the output of df command]' \
  '(H)'{-J,--json}'[use JSON output format]' \
  '(H)'{-l,--list}'[use list output format]' \
  '(H)'{-P,--pairs}'[use key="value" output format]' \
  '(H)'{-r,--raw}'[use raw output format]' \
  + '(S)' \
  '(H)'{-k,--kernel}'[search in /proc/self/mountinfo (default)]' \
  '(H)'{-m,--mtab}'[search in /etc/mtab]' \
  '(H)'{-N+,--task=}'[search /proc/<pid>/mountinfo]: :_pids' \
  '(H)'{-s,--fstab}'[search in /etc/fstab]' \
  + '(H)' \
  '(- :)'{-h,--help}'[display help text and exit]' \
  '(- :)'{-V,--version}'[display version and exit]' \
    && ret=0

__findmnt_mountpoints () {
  compadd "$@" \
    ${(f)"$(_call_program mount-points findmnt $opts -oTARGET)"}
}

case $state in
  columns)
    compset -P '+' || _describe -t list-prefixes prefix \
		      '( +:"not replace but extend the list" )' -S '' && ret=0
    local -a columns=(
      ${${${(f)"$(_call_program columns findmnt -h)"}[(r)Available*,-2]}[2,-1]}
    )
    columns=( ${${${${${${columns## #}//:/\\:}//\[/\\[}//]/\\]}/  /[}/%/]} )
    _values -s , -M 'm:{a-z}={A-Z}' column $columns && ret=0
    ;;
  *) # call "findmnt $opts" to get possible sources/targets
    local opts='-lnve'
    if [[ -n $opt_args[(I)S-(-m|--mtab)] ]]; then
      opts+=' -m'
    elif [[ -n $opt_args[(I)S-(-s|--fstab)] ]]; then
      opts+=' -s'
    elif [[ -n $opt_args[(I)S-(-N|--task)] ]]; then
      opts+=" -N${(v)opt_args[(I)S-(-N|--task)]}"
    fi
    ;|
  sources*) # 'sources' or 'sources_targets'
    local -a val
    if compset -P 'LABEL='; then
      val=( ${(f)"$(_call_program labels findmnt $opts -oLABEL)"} )
      _describe -t labels 'LABEL' val && ret=0
    elif compset -P 'PARTLABEL='; then
      val=( ${(f)"$(_call_program labels findmnt $opts -oPARTLABEL)"} )
      _describe -t labels 'PARTLABEL' val && ret=0
    elif compset -P 'UUID='; then
      val=( ${(f)"$(_call_program uuids findmnt $opts -oUUID)"} )
      _describe -t uuids 'UUID' val && ret=0
    elif compset -P 'PARTUUID='; then
      val=( ${(f)"$(_call_program uuids findmnt $opts -oPARTUUID)"} )
      _describe -t uuids 'PARTUUID' val && ret=0
    else
      local -a alts=(
	'devices:device:compadd \
		$(_call_program devices findmnt $opts -oSOURCE)'
	'device-numbers:major-minor:compadd \
		${$(_call_program device-numbers findmnt $opts -oMAJ:MIN)// /}'
	'prefixes:prefix:compadd -S "" LABEL= UUID= PARTLABEL= PARTUUID='
      )
      [[ $state = sources_targets ]] &&
	alts+=( 'mount-points:mountpoint:__findmnt_mountpoints' )
      _alternative $alts && ret=0
    fi
    ;;
  targets)
    local expl
    _wanted mount-points expl 'mountpoint' __findmnt_mountpoints && ret=0
    ;;
esac

return ret