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#compdef kerl

# ------------------------------------------------------------------------------
# Description
# -----------
#
#  Completion script for kerl (http://github.com/spawngrid/kerl
#
#  Source: https://github.com/sanmiguel/zsh-completions
#
# ------------------------------------------------------------------------------
# Authors
# -------
#
#  * Michael Coles (https://github.com/sanmiguel)
#
# ------------------------------------------------------------------------------

# TODO: These are naive and stupid
_kerl_available_releases() {
  # we use the file directly as `kerl list releases` dumps extraneous data to stdout
  releases=(${(f)"$(_call_program releases cat ~/.kerl/otp_releases)"})
}

_kerl_builds() {
  builds=(${(f)"$(_call_program builds kerl list builds 2>/dev/null | cut -f 2 -d ",")"})
}

_kerl_installations() {
  installations=(${(f)"$(_call_program installations kerl list installations 2>/dev/null | cut -f 2 -d " ")"})
}

_kerl_installnames() {
    installnames=(${(f)"$(_call_program installations kerl list installations 2>/dev/null | cut -f 2 -d " " | xargs basename)"})
}

local -a _1st_arguments
_1st_arguments=(
  'build:Build specified release or git repository'
  'install:Install the specified release at the given location'
  'deploy:Deploy the specified installation to the given host and location'
  'update:Update the list of available releases from erlang.org'
  'list:List releases, builds and installations'
  'delete:Delete builds and installations'
  'active:Print the path of the active installation'
  'path:Print the path of any installation'
  'status:Print available builds and installations'
  'prompt:Print a string suitable for insertion in prompt'
  'cleanup:Remove compilation artifacts (use after installation)'
)

local -a _list_options
_list_options=(
    'releases:All available OTP releases'
    'builds:All locally built OTP releases'
    'installations:All locally installed OTP builds'
)
local -a _update_options
_update_options=(
    'releases:All available OTP releases'
)

local expl
local -a releases builds installations

_arguments \
  '*:: :->subcmds' && return 0

if (( CURRENT == 1 )); then
  _describe -t commands "kerl subcommand" _1st_arguments
  return
fi

case "$words[1]" in
  active) ;;
  status) ;;
  prompt) ;;
  build)
    _arguments \
        '1: :->rels' \
        '2: :->buildnames' && return 0

        if [[ "$state" == rels ]]; then
            _kerl_available_releases
            _wanted releases expl 'all releases' compadd -a releases
        elif [[ "$state" == buildnames ]]; then
            
        fi;;
        # TODO: suggest build name as $(lowercase $release)
  install)
      _arguments \
        '1: :->blds' \
        '2::location:_path_files -W "(~/kerl)"' && return 0
        ## TODO: This path should not be hard-coded!
        
      if [[ "$state" == blds ]]; then
        _kerl_builds
        _wanted builds expl 'all builds' compadd -a builds
        return
      fi
      # TODO: suggest starting location of "$KERLDIR/$(lowercase $build)"
      _directories
      ;;
  path)
      _arguments \
          '1: :->installnames' && return 0
      if [[ "$state" == installnames ]]; then
          _kerl_installnames
          _wanted installnames expl '' compadd -a installnames
          return
      fi
      ;;
  deploy) 
      _arguments \
          '1: :->hosts' \
          '2: :->installs' && return 0
      
      if [[ "$state" == hosts ]]; then
          _hosts
          return
      elif [[ "$state" == installs ]]; then
          _kerl_installations
          _wanted installations expl 'all installations' compadd -a installations
          return
      fi
      ;; # TODO: [remote directory] (or at least prompt)
  update) 
      _arguments '1: :->updopts' && return 0
      if [[ "$state" == updopts ]]; then _describe "kerl update options" _update_options; fi
      ;;
  list)
      _arguments '1: :->listopts' && return 0
      if [[ "$state" == listopts ]]; then _describe "kerl list options" _list_options; fi
      ;;
  delete) 
      _arguments \
          '1:<build|installation>:(build installation)'  && return 0

      case "$words[2]" in
          build)
              _kerl_builds
              _wanted builds expl 'all builds' compadd -a builds
              return
              ;;
          installation)
              _kerl_installations
              _wanted installations expl 'all installations' compadd -a installations
              return
      esac
      ;;
  cleanup) 
      _kerl_builds
      builds=('all' $builds)
      _wanted builds expl 'all builds' compadd -a builds;;
esac