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#compdef locate mlocate slocate

# Decide if we are using mlocate or slocate.
local ltype basename=${words[0]:t} input
# If we can't, use this guess.
local best_guess=mlocate

case $basename in
  ([ms]locate)
  ltype=$basename
  ;;

  (locate)
  input="$(_call_program locate $words[0] -V)"
  case $input in
    (*mlocate*)
    ltype=mlocate
    ;;

    (*(#i)secure locate*)
    ltype=slocate
    ;;

    (*(#i)gnu locate*)
    ltype=gnu
    ;;

    # guess
    (*)
    ltype=$best_guess
    ;;
  esac
  ;;

  (*)
  # too dangerous to run: guess
  ltype=$best_guess
esac

case $ltype in
  (mlocate)
  # actually, -d can take a colon-separate list
  # -r/--regexp mean no normal arguments, so shouldn't complete
  # -m and --mmap are ignored, so don't bother
  # -s and --stdio likewise
  _arguments -s : \
    {-b,--basename}'[Match only the basename of files in the database]' \
    {-c,--count}'[Output the number of matching entries]' \
    {-d,--database=}'[Use alternative database]:database:_files' \
    {-e,--existing}'[Restrict display to existing files]' \
    {-L,--follow}'[Follow symbolic links to find existing files (default)]' \
    {-h,--help}'[Show help]' \
    {-i,--ignore-case}'[Ignore case distinctions in patterns]' \
    {-l,-n,--limit=}'[Limit search results]:file limit: ' \
    {-P,-H,--nofollow}'[Don'\''t follow symbolic links]' \
    {-0,--null}'[Output separated by NUL characters]' \
    {-S,--statistics}'[Show database statistics]' \
    {-q,--quiet}'[Don'\''t report errors]' \
    {-r,--regexp=}'[Search for given basic regexp]:basic regexp: ' \
    --regex'[Patterns are extended regexps]' \
    {-V,--version}'[Show version]' \
    {-w,--wholename}'[Match entire file path (default)]' \
    '*:pattern: '
  ;;

  (slocate)
  # -d can take path
  # -e can take a comma-separated list of directories.
  # -f should complete list of file system types like mount
  _arguments -s : \
    -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]' \
    {-v,--verbose}'[Display files when creating database]' \
    {-V,--version}'[Display version]' \
    '*:pattern: '
  ;;

  (gnu)
  _arguments -s : \
    {-d,--database=}'[Use alternative database]:database:_files' \
    {-e,--existing}'[Restrict display to existing files]' \
    {-E,--non-existing}'[Allow display of nonexistent files (default)]' \
    {-i,--ignore-case}'[Ignore case distinctions in patterns]' \
    {-w,--wholename}'[Match entire file path (default)]' \
    {-b,--basename}'[Match only the basename of files in the database]' \
    {-l,-n,--limit=}'[Limit search results]:file limit: ' \
    {-S,--statistics}'[Show database statistics]' \
    {-0,--null}'[Output separated by NUL characters]' \
    {-c,--count}'[Output the number of matching entries]' \
    {-P,-H,--nofollow}'[Don'\''t follow symbolic links]' \
    {-L,--follow}'[Follow symbolic links to find existing files (default)]' \
    {-A,-all}'[Match all arguments instead of at least one]' \
    {-p,--print}'[Include search results with statistics or count]' \
    {-r,--regex=}'[Patterns are regular expressions]:basic regexp: ' \
    --regextype='[Select type of regular expression]' \
    {-V,--version}'[Show version]' \
    --help'[Show help]' \
    '*:pattern: '
  ;;
esac