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#compdef btrfs
# based on Btrfs v3.12+20131125

local curcontext="$curcontext" curstate state line expl grp cmd cont shift ret=1
local -a cmds_1 cmds_2 cmds_3 cmds_4 cmds_5 cmds_6 cmds_7 cmds_8 cmds_9 cmds_10
local -a groups args

groups=( subvolume filesystem device scrub balance inspect-internal
         quota qgroup replace rescue check restore send receive
         help version )
cmds_1=( create delete list snapshot get-default set-default find-new show help )
cmds_2=( df show sync defragment resize label balance help )
cmds_3=( add delete ready scan stats help )
cmds_4=( start cancel resume status help )
cmds_5=( start pause cancel resume status )
cmds_6=( inode-resolve logical-resolve subvolid-resolve rootid help )
cmds_7=( enable disable rescan help )
cmds_8=( assign remove create destroy show limit help )
cmds_9=( start status cancel help )
cmds_10=( chunk-recover super-recover )

[[ $words[2] = h(|e(|l(|p))) ]] && args=( '--full[display detailed help]' )

_arguments -C "$args[@]" \
  '(- *)--help[print help information]' \
  '(- *)--version[print version information]' \
  '(--version)1: :->groups' \
  '2: :->cmds' \
  '*:: :->args' && ret=0

while (( $#state )); do
  curstate=$state
  shift state
  case $curstate in
    groups)
      _wanted command-groups expl 'btrfs command group' compadd -a groups && ret=0
    ;;
    cmds)
      grp=${groups[(i)$words[2]*]}
      (( grp && grp <= 14 )) || return 1
      cont=${groups[grp]}
      curcontext="${curcontext%:*:*}:$service-${cont}:"
      if (( grp <= 10 )); then
        _wanted commands expl command compadd -a cmds_$grp && ret=0
        continue
      fi
    ;&
    args)
      if [[ $curstate != cmds ]]; then
        grp=${groups[(i)$words[1]*]}
        (( grp && grp <= 15 )) || return 1
        cont=${groups[grp]}
        if (( grp <= 10 )); then
          local group=cmds_$grp
          local cmd=${${(P)group}[(i)$words[2]*]}
          (( cmd )) || return 1
          cont+=:${${(P)group}[cmd]}
        else
          shift=1
        fi
        curcontext="${curcontext%:*:*}:$service-${cont/:/-}:"
      fi
      args=( '(-)--help[print help information]' )
      case ${cont} in
        filesystem:balance)
          if (( CURRENT == 3 )); then
            state+=cmds
          else
            shift words
            (( CURRENT-- ))
            state+=args
          fi
          continue
        ;;
        subvolume:create) args+=( '1:destination:->mounts' );;
        subvolume:delete) args+=( '1:subvolume:_files -/' );;
        subvolume:snapshot)
          args+=(
            '-r[readonly snapshot]'
            '*-i[assign to qgroup]:qgroup: _message "qgroup"'
            '1:source directory:_files -/'
            '2:snapshot name or destination:_files -/'
          )
        ;;
        subvolume:list)
          args+=(
            '-p[include parent ID in output]'
            '-a[include all subvolumes]'
            '-c[include ogeneration of the subvolume]'
            '-g[include generation of the subvolume]'
            '-o[include only subvolumes below the path]'
            '-u[include UUID of subvolume]'
            '-q[include parent UUID of subvolume]'
            '-t[print results as a table]'
            '-s[list only snapshot subvolumes]'
            '-r[list only readonly subvolumes]'
            '-G[subvolume generation is more or less than]:gen: _guard "(|+|-)[0-9]#"'
            '-C[subvolume ogeneration is more or less than]:ogen: _guard "(|+|-)[0-9]#"'
            '--sort=-[list in order]:sort:_values -s "," sort rootid gen ogen path'
            '1:path:->mounts'
          )
        ;;
        subvolume:set-default) args+=( '1:id:_guard "[0-9]#" id' '2:path:->mounts' );;
        subvolume:get-default) args+=( '1:path:_files -/' );;
        subvolume:find-new) args+=( '1:subvol:_files -/' '2:lastgen: _message "last gen"' );;
        filesystem:resize) args+=( '1:size:_guard "(|+|-)[0-9]#[GKM]"' '2:path:->mounts' );;
        filesystem:defragment)
          args+=(
            '-v[verbose]'
            '-c[compress files while defragmenting]'
            '-r[defragment files recursively]'
            '-f[flush after defragmenting]'
            '-s[start position]:byte position'
            '-l[defragment limited number of bytes]:length (bytes)'
            '-t[defragment only files over a certain size]:minimum size (bytes)'
            '*:file:_files'
          )
        ;;
        filesystem:label) args+=( '1:device:_files -g "*(d)"' '2:label' );;
        filesystem:show)
          args+=(
            '(1 -)'{-d,--all-devices}'[scan all devices in /dev]'
            '(1 -)'{-m,--mounted}'[show only mounted filesystems]'
            '1: :_guard "^-*" uuid or label'
          )
        ;;
        device:(add|delete))
          args+=(
            '1:device:_files -g "*(d)"'
            '2:path:->mounts'
            )
          [[ ${${(P)group}[cmd]} == add ]] &&
            args+=(
              {-K,--nodiscard}'[do not perform discard]'
              {-f,--force}'[force overwrite of existing filesystem]'
            )
        ;;
        device:scan) args+=( '(1 -)--all-devices[scan all devices in /dev]' '1:device:_files -g "*(d)"' );;
        device:stats) args+=( "1:device or mountpoint:_files -g '*(d,/)'" '-z[reset stats when done]' );;
        device:ready) args+=( '1:device: _files -g "*(d)"' );;
        scrub:(start|resume))
          args+=(
            "-B[don't background and print statistics at end]"
            '-d[print separate statistics for each device]'
            '-q[omit error message and statistics]'
            '-r[read only mode]'
            '-R[raw print mode]'
            '-c[set ioprio class]:class:(( 0\:none 1\:realtime 2\:best-effort 3\:idle))'
            '-n[set ioprio classdata]:classdata:(0 1 2 3 4 5 6 7)'
            '1:path or device:_files'
          )
          [[ ${${(P)group}[cmd]} == start ]] && args+=( '-R[raw print mode]' )
        ;;
        scrub:cancel) args+=( '1:path or device' );;
        scrub:status) args+=( '-d[separate statistics for each device]' '1:path or device:_files' );;
        balance:start)
          args+=(
            '(-m -s)-d+[act on data chunks]:filter:->filters'
            '(-d -s)-m+[act on metadata chunks]:filter:->filters'
            '(-d -m)-s+[act on system chunks (only under -f)]:filters:->filters'
            '-v[verbose mode]'
            '-f[force reducing of metadata integrity]'
            '1:path:_files -/'
          )
        ;;
        balance:status) args+=( '-v[verbose mode]' '1:path:_files -/' );;
        balance:(pause|cancel|resume)) args+=( '1:path:_files -/' );;
        quota:(enable|disable)) args+=( '1:path:_files -/' );;
        quota:rescan)
          args+=(
            '-s[show status of currently running rescan]'
            '-w[wait for rescan to finish]'
            '1:path:_files -/'
          )
        ;;
        qgroup:(assign|remove)) args+=( '1:source path:_files -/'
          '2:destination path:_files -/' '3:path:_files -/' );;
        qgroup:(create|destroy)) args+=( '1:qgroupid:' '2:path:_files -/' );;
        qgroup:show)
          args+=(
            '-p[print parent qgroup id]'
            '-c[print child qgroup id]'
            '-r[print max referenced size of qgroup]'
            '-e[print max exclusive size of qgroup]'
            '-F[list impacted qgroups\(include ancestral qgroups\)]'
            '-f[list impacted qgroups\(exclude ancestral qgroups\)]'
            '--sort=-[sort qgroups]:sort:_values -s , sort \
              qgroupid rfer excl max_rfer max_excl'
            '1:path:_files -/'
          )
        ;;
        qgroup:limit)
          args+=(
            '-c[limit amount of data after compression]'
            '-e[limit space exclusively to qgroup]'
            ':size or none: _message "size or none"'
            ':qgroup id or path:_files -/'
            ':path:_files -/'
          )
        ;;
        replace:start)
          args+=(
            '-r[read from <srcdev> only]:srcdev:_files'
            '-f[force overwriting of target]'
            '-B[do not background]'
            ':srcdev or devid:_files'
            ':target:_files'
            ':path:->mounts'
          )
        ;;
        replace:status) args+=( '-1[print once]' ':path:->mounts' );;
        replace:cancel) args+=( ':path:->mounts' );;
        inspect*:inode*) args+=( '-v[verbose mode]' '1:inode:_files' '2:path:_files -/' );;
        inspect*:subvol*) args+=( '-v[verbose mode]' '1:subvolid:_guard "[0-9]#" subvolume id' '2:path:_files -/' );;
        inspect*:logical*)
          args+=(
            '-v[verbose mode]'
            '-P[skip the path resolving and print the inodes instead]'
            '-s[buffer size]:buffer size:'
            '1:logical address:_files'
            '2:filesystem path:_files -/'
          )
        ;;
        inspect*:rootid) args+=( '1:path:_files -/' );;
        rescue:(chunk|super)-recover)
          args+=(
            '-y[assume yes to every question]'
            '-v[verbose mode]'
          )
          [[ ${${(P)group}[cmd]} == chunk-recover ]] && args+=('-h[display help]')
        ;;
        subvolume:get-default) ;&
        *:sync) ;&
        *:df) args+=( '1:path:->mounts' );;
        check)
          args+=(
            {-s,--support}'[specify superblock]:superblock'
            '--repair[try to repair the filesystem]'
            '--init-csum-tree[create a new CRC tree]'
            '--init-extent-tree[create a new extent tree]'
            '1:path:_files -/'
          )
        ;;
        restore)
          args+=(
            '-s[get snapshots]'
            '-x[get extended attributes]'
            '-v[verbose]'
            '-i[ignore errors]'
            '-o[overwrite]'
            '-t[tree location]:tree'
            '-f[filesystem location]:filesystem'
            '-u[super mirror]:mirror'
            '-r[root objectid]:objectid'
            '-d[find dir]'
            '-l[list tree roots]'
            '--path-regex[restore matching filenames]:regex'
            '1:device:_files -/'
            '2:path:_files -/'
          )
        ;;
        send)
          args+=(
            '*-v[verbose mode]'
            '-p[send incremental stream]:parent:_files -/'
            '*-c[use snapshot as clone source]:clone:_files -/'
            '-f[output file]:file:_files'
            '1:subvolume:_files -/'
          )
        ;;
        receive)
          args+=(
            '*-v[verbose mode]'
            '-f[input file]:file: _files'
            '-e[terminate after <end cmd>]'
            '1:mount:->mounts'
          )
        ;;
        *) args+=( '*: :_default' );; # fallback for unknown subcommands
      esac
      if ! (( shift )); then
        shift words
        (( CURRENT-- ))
      fi
      _arguments -C "$args[@]" && ret=0
    ;;
    mounts)
      _wanted mount-points expl 'mount point' compadd \
          ${${${(M)${(f)"$(</etc/mtab)"}:#*btrfs*}#* }%% *} && ret=0
    ;;
    filters)
      state=()
      _values -s , filter \
        'profiles[balance only block groups in given replication profiles]:profile:->profiles' \
        'usage[balance block groups with usage below percentage]:percentage' \
        'devid[limit by device ID]:device ID' \
        'drange[balance block groups overlapping byte range]:range' \
        'vrange[balance block groups overlapping byte range in virtual address space]:range' \
        'convert[convert block groups to given profile]:profile:->profiles' \
        'soft[leave chunks that already have target profile]' && ret=0
      state=( $state )
    ;;
    profiles)
      compset -P '*\|'
      _values -s ',' profile raid0 raid1 raid5 raid6 raid10 dup single && ret=0
    ;;
  esac
done

return ret
debug log:

solving 33b5c76f9 ...
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