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#compdef locate mlocate slocate glocate

local variant=$service
local -a args
[[ $service = locate ]] &&
  _pick_variant -r variant glocate=findutils mlocate=mlocate slocate=secure $OSTYPE -V
args=( '(-)'{-V,--version}'[display version information]' )

case $variant in
  [mg]locate)
    args+=(
      '(-A --all)'{-A,--all}'[only print entries that match all patterns]'
      '(-E --non-existing -e --existing)'{-e,--existing}'[restrict display to existing files]'
      '(-c --count)'{-c,--count}'[output the number of matching entries]'
      '(-i --ignore-case)'{-i,--ignore-case}'[ignore case distinctions in patterns]'
      '(-w --wholename -b --basename)'{-w,--wholename}'[match entire file path (default)]'
      '(-w --wholename -b --basename)'{-b,--basename}'[match only the basename of files in the database]'
      '(-P -H --no-follow -L --follow)'{-P,-H,--nofollow}"[don't follow symbolic links]"
      '(-P -H --no-follow -L --follow)'{-L,--follow}'[follow symbolic links to find existing files (default)]'
      '(-0 --null)'{-0,--null}'[output separated by NUL characters]'
      '(-S --statistics)'{-S,--statistics}'[show database statistics]'
    )
  ;|

  (mlocate)
  # -r/--regexp mean no normal arguments, so shouldn't complete
  # -m and --mmap are ignored, so don't bother
  # -s and --stdio likewise
    args=( -s -S : $args
      \*{-d,--database=}'[use alternative database]:database:_sequence -s \: _files'
      '(-)'{-h,--help}'[display help information]'
      '(-l -n --limit)'{-l,-n,--limit=}'[limit search results]:file limit'
      '(-q --quiet)'{-q,--quiet}"[don't report errors]"
      '(:)*'{-r,--regexp=}'[search for given basic regexp]:basic regexp'
      '--regex[patterns are extended regexps]'
    )
  ;;

  (slocate)
  # -d can take path
  # -e can take a comma-separated list of directories.
  # -f should complete list of file system types like mount
    args=( -s -S : $args
      -u'[create slocate database starting at path /]'
      -U'[create slocate database starting at given path]:directory:_files -/'
      -c'[parse GNU locate updatedb with -u, -U]'
      -e'[exclude directories with -u, -U]:directories:_files -/'
      -f'[exclude file system types from db with -u, -U]:file system:_file_systems'
      -l'[security level]:level:(0 1)'
      -q'[quiet mode]'
      -n'[limit search results]:file limit '
      -i'[case insensitive search]'
      {-r,--regexp=}'[use basic regular expression]:regexp'
      {-o,--output=}'[specify database to create]:database:_files'
      {-d,--database=}'[specify database to search]:database:_files'
      '(-)'{-h,--help}'[display help information]'
      {-v,--verbose}'[display files when creating database]'
    )
  ;;

  (glocate)
    args=( -s : $args
      \*{-d,--database=}'[use alternative database]:database:_files'
      '(-E --non-existing -e --existing)'{-E,--non-existing}'[restrict display to nonexistent files]'
      '(-l --limit)'{-l,--limit=}'[limit search results]:file limit: '
      '--max-database-age[specify database age at which warning should be issued]:age (days) [8]'
      '(-p --print)'{-p,--print}'[include search results with statistics or count]'
      \*{-r,--regex=}'[patterns are regular expressions]:regexp'
      --regextype='[select type of regular expression]:regex type [basic]:(findutils-default awk egrep ed emacs gnu-awk grep posix-awk posix-basic posix-egrep posix-extended posix-minimal-basic sed)'
      '(-)'--help'[display help information]'
    )
  ;;

  (freebsd|openbsd|dragonfly|darwin)*)
    args=( -s -S -A '-*'
      '(-S)-c[output the number of matching file names]'
      '(-S)-i[ignore case distinctions in pattern and database]'
      '(-S)-l[limit output to specified number of file names]:file limit '
      '(- *)-S[show database statistics and exit]'
    )
  ;|
  openbsd*)
    args+=( '(-S)-b[match only the basename of files in the database]' )
  ;|
  (freebsd|dragonfly|darwin)*)
    args+=(
      '(-S)-0[separate file names by NUL characters]'
      '(-S)-m[use mmap(2) instead of stdio(3) (default)]'
      '(-S)-s[use stdio(3) instead of mmap(2)]'
    )
  ;|
  (*) args+=( '(-S)*-d[specify database to search]:database:_files' ) ;;

esac

_arguments $args '*: :_guard "^-*" pattern'