#compdef perlbrew

#
# A zsh completion script for perlbrew (https://metacpan.org/dist/App-perlbrew/)
#

local curcontext="$curcontext" state state_descr line ret=1
local -a args_common args_install
typeset -A opt_args
# others local variables
typeset -g perlbrew_subcommands

##
## get the list of perl available versions
##
(( $+functions[_perlbrew_caching_policy] )) ||
_perlbrew_caching_policy() {
  # rebuild if cached data are more than one week old
  local -a newer=( "$1"(Nmw-1) )
  return $#newer
}

(( $+functions[_perl_available] )) ||
_perl_available() {
  local -a available_versions
  local update_policy

  zstyle -s ":completion:${curcontext}:" cache-policy update_policy
  if [[ -z "$update_policy" ]]; then
    zstyle ":completion:${curcontext}:" cache-policy _perlbrew_caching_policy
  fi

  if _cache_invalid perlbrew-available-versions || ! _retrieve_cache perlbrew-available-versions; then
    # this can be slow
    available_versions=( ${${${${(f)"$(_call_program perl_releases perlbrew available)"}/\# (cp|p)erl/}/(#s)i /}// /} \
                         perl-stable \
                         perl-blead )
    _store_cache perlbrew-available-versions available_versions
  fi
  _values 'available version' ${(n)available_versions}
}

##
## get the list of local perl installations
##
(( $+functions[_perl_installations] )) ||
_perl_installations() {
  local text
  local -a installed alias_link

  case "$1" in
    (-with-lib)
      installed=( ${${${(f)"$(_call_program perl_installed perlbrew list)"}/(#s)\*/}// /} )
      text="perl installation"
      ;;
    (-only-lib)
      installed=( ${(M)${${${(f)"$(_call_program perl_installed perlbrew list)"}/(#s)\*/}// /}:#*@*} )
      text="perl installation"
      ;;
    (-without-lib)
      installed=( ${${${${(f)"$(_call_program perl_installed perlbrew list)"}/(#s)\*/}// /}:#*@*} )
      text="perl installation"
      ;;
    (-alias)
      if [[ -n "$PERLBREW_ROOT" ]]; then
        if [[ -d "$PERLBREW_ROOT/perls" ]]; then
          alias_link=( $PERLBREW_ROOT/perls/*(@) )
        fi
      fi
      installed=( ${(q)${alias_link:t}[@]} )
      text="alias"
      ;;
  esac

  if [[ ${#installed[@]} -eq 0 ]]; then
    _message 'no local perl installation found'
  else
    case "$2" in
      (-comma-separated)
        _values -s , "$text" $installed
        ;;
      (*)
        _values "$text" $installed
        ;;
    esac
  fi
}

##
## completion for the alias subcommand
##
(( $+functions[_perlbrew_alias] )) ||
_perlbrew_alias() {
  local line state ret=1

  _arguments -C \
    -f'[force]' \
    "1: :->actions" \
    "*::arg:->args" && ret 0

  case "$state" in
    (actions)
      local -a alias_actions
      alias_actions=(
        "create:create an alias for the installation named <name>"
        "rename:rename the alias to a new name"
        "delete:delete the given alias"
      )
      _describe -t commands 'alias action' alias_actions && ret=0
      ;;
    (args)
      case $line[1] in
        (create)
          _arguments \
            '1:perl installation: _perl_installations -without-lib' \
            '2: : _message "alias name"' && ret=0
          ;;
        (rename)
          _arguments \
            '1:perl installation: _perl_installations -alias' \
            '2: : _message "new name"' && ret=0
          ;;
        (delete)
          _arguments \
            ':perl installation: _perl_installations -alias' && ret=0
          ;;
      esac
      ;;
  esac
}

##
## completion for the lib subcommand
##
(( $+functions[_perlbrew_lib] )) ||
_perlbrew_lib() {
  local line state ret=1

  _arguments -C \
    "1: :->actions" \
    "*::arg:->args" && ret=0

  case "$state" in
    (actions)
      local -a lib_actions
      lib_actions=(
        "list:list existing local libs"
        "create:create a local lib"
        "delete:delete a local lib"
      )
      _describe -t commands 'lib action' lib_actions && ret=0
      ;;
    (args)
      case $line[1] in
        (list)
          _nothing && ret=0
          ;;
        (create)
          _message 'lib name' && ret=0
          ;;
        (delete)
          _arguments \
            ':perl installation: _perl_installations -only-lib' && ret=0
          ;;
      esac
      ;;
  esac
}

##
## main completion script
##

args_common=(
  '(-q --quiet)'{-q,--quiet}'[be quiet on informative output message]' \
  '(-v --verbose)'{-v,--verbose}'[tell me more about it]' \
  ':perlbrew command:->subcommands' \
  '*::: := ->option-or-argument'
)

args_install=(
  '(-f --force)'{-f,--force}'[force installation]' \
  -j"[number of building jobs run in parallel]::number" \
  '(-n --notest)'{-n,--notest}'[skip testing]' \
  --switch"[automatically switch to this perl version once installed]" \
  --as"[install the given version of perl by a name]:alias name" \
  --noman"[skip installation of manpages]" \
  --thread"[build perl with usethreads enabled]" \
  --multi"[build perl with usemultiplicity enabled]" \
  --64int"[build perl with use64bitint enabled]" \
  --64all"[build perl with use64bitall enabled]" \
  --ld"[build perl with uselongdouble enabled]" \
  --debug"[build perl with DEBUGGING enabled]" \
  --clang"[build perl using the clang compiler]" \
  --no-patchperl"[skip calling patchperl]" \
  {-D,-U,-A}"[switches passed to perl Configure script]:value:" \
  --destdir"[install perl as per 'make install DESTDIR=\$path']: :_files -/" \
  --sitecustomize"[specify a file to be installed as sitecustomize.pl]: :_files" \
  --mirror"[specify a CPAN-mirror url]:URL:_urls"
)

_arguments -C $args_common && ret=0

case $state in
  (subcommands)

    perlbrew_subcommands=(
      "init:initialize perlbrew environment"
      "info:show useful information about the perlbrew installation"
      "install:install perl"
      "uninstall:uninstall the given installation"
      "available:list perls available to install"
      "lib:manage local::lib directories"
      "alias:give perl installations a new name"
      "upgrade-perl:upgrade the current perl"
      "list:list perl installations"
      "use:use the specified perl in current shell"
      "off:turn off perlbrew in current shell"
      "switch:permanently use the specified perl as default"
      "switch-off:permanently turn off perlbrew (revert to system perl)"
      "exec:exec programs with specified perl environments"
      "clone-modules:re-installs all CPAN modules from one installation to another"
      "self-install:install perlbrew itself under PERLBREW_ROOT/bin"
      "self-upgrade:upgrade perlbrew itself"
      "install-patchperl:install patchperl"
      "install-cpanm:install cpanm, a friendly companion"
      "install-cpm:install cpm, a faster but still friendly companion"
      "install-multiple:install multiple versions and flavors of perl"
      "download:download the specified perl distribution tarball"
      "clean:purge tarballs and build directories"
      "version:display version"
      "help:read more detailed instructions"
    )

    _describe -t commands 'perlbrew command' perlbrew_subcommands && ret=0

    ;;
  (option-or-argument)
    curcontext=${curcontext%:*}-$line[1]:
    case $line[1] in
      (info)
        _message 'perl module name' && ret=0
        ;;
      (install)
        _arguments \
           $args_install \
           '1:perl release: _perl_available' && ret=0
        ;;
      (install-multiple)
        _arguments \
           $args_install \
           '*'--both"[perl flavor]: :(thread multi ld 64int 64all debug clang )" \
           --common-variations"[equivalent to '--both thread --both ld --both 64int']" \
           --all-variations"[generates all the possible flavor combinations]" \
           --append"[appends the given string to the generated names]:string" \
           '*:perl release: _perl_available' && ret=0
        ;;
      (uninstall)
        _arguments \
          ":perl installation: _perl_installations -without-lib" && ret=0
        ;;
      (use|switch)
        _arguments \
          ':perl installation: _perl_installations -with-lib' && ret=0
        ;;
      (available)
        _arguments \
          '--all[list of all perls ever released, including development and RC versions]' \
          '*: :' && ret=0
        ;;
      (alias)
        _perlbrew_alias && ret=0
        ;;
      (exec)
        _arguments -C \
          --with'[specify one or more perl installations to use]: : _perl_installations -without-lib -comma-separated' \
          --min'[minimum perl version]:version number (n.nnnnn):' \
          --max'[maximum perl version]:version number (n.nnnnn):' \
          --halt-on-error'[stop on first nonzero exit status]' \
          "1:command:" \
          "*:args:" && ret=0
        ;;
      (env) # NOTE: Low level command
        _arguments \
          ':perl installation: _perl_installations -with-lib' && ret=0
        ;;
      (symlink-executables) # NOTE: Low level command
        _arguments \
          ':perl installation: _perl_installations -with-lib' && ret=0
        ;;
      (lib)
        _perlbrew_lib && ret=0
        ;;
      (download)
        _arguments \
          ':perl release: _perl_available' && ret=0
        ;;
      (clone-modules)
        _arguments \
          '--notest[skip all module tests]' \
          ':perl installation: _perl_installations -with-lib' \
          ':perl installation: _perl_installations -with-lib' && ret=0
        ;;
      (init|list|off|switch-off|install-cpanm|install-patchperl|self-upgrade|\
        self-install|clean|version|upgrade-perl|list-modules)
        _nothing && ret=0
        ;;
      (*)
        _default && ret=0
        ;;
    esac
    ;;
esac

return ret