bash_completion

#!/bin/bash

__inarray() {
  local i
  for i in "${@:2}"; do
    [[ $i == "$1" ]] && return
  done
}

__hasprefix() {
  local i
  for i in "${@:2}"; do
    [[ $i = "$1"* ]] && return
  done
}

_cower() {
  local argv0=${COMP_WORDS[0]}
  local cur=${COMP_WORDS[COMP_CWORD]} prev=${COMP_WORDS[COMP_CWORD - 1]} prevprev=${COMP_WORDS[COMP_CWORD - 2]}

  local shortopts=(-d -i -m -s -u -f -h -t -V -b -c -o -q -v)
  local longopts=(--download --info --msearch --search --update --force --version
                  --brief --debug --ignore-ood --no-ignore-ood --quiet --verbose)
  local longoptsarg=(--ignore --ignorerepo --target --threads --timeout --color --format
                     --sort --rsort -listdelim)
  local allopts=("${shortopts[@]}" "${longopts[@]}" "${longoptsarg[@]}")

  local sortfields=(firstsubmitted lastmodified license maintainer name outofdate version votes)

  # maybe mangle the arguments in case we're looking at a --longopt=$val
  [[ $cur = '=' ]] && cur=
  if [[ $prev = '=' ]] && __inarray "$prevprev" "${allopts[@]}"; then
    prev=$prevprev
  fi

  case $prev in
    --format|--threads|--timeout|--listdelim)
      COMPREPLY=()
      return 0
      ;;
    -t|--target)
      COMPREPLY=($(compgen -d -- "$cur"))
      compopt -o filenames
      return 0
      ;;
    -c|--color)
      COMPREPLY=($(compgen -W 'auto never always' -- "$cur"))
      return 0
      ;;
    --rsort|--sort)
      COMPREPLY=($(compgen -W '${sortfields[*]}' -- "$cur"))
      return 0
      ;;
    --ignore)
      COMPREPLY=($(compgen -W "$(pacman -Qqm 2>/dev/null)" -- "$cur"))
      return 0
      ;;
    --ignorerepo)
      COMPREPLY=($(compgen -W "$(sed '/^\[\(.*\)\]$/!d;s//\1/;/options/d' /etc/pacman.conf)" -- "$cur"))
      return 0
      ;;
  esac

  case $cur in
    --*)
      if __hasprefix "$cur" "${longoptsarg[@]}"; then
        compopt -o nospace
        COMPREPLY=($(compgen -W '${longoptsarg[*]}' -S = -- "$cur"))
      else
        COMPREPLY=($(compgen -W '${longopts[*]}' -- "$cur"))
      fi
      return 0
      ;;
    -*)
      COMPREPLY=($(compgen -W '${allopts[*]}' -- "$cur"))
      return 0
      ;;
    *)
      # completion based on mode -- always take the last specified
      local i j w mode
      for (( i = 1; i < ${#COMP_WORDS[*]}; i++ )); do
        w=${COMP_WORDS[i]}
        if (( i == 1 )) || [[ ${COMP_WORDS[i-1]} != -* ]]; then
          case $w in
            # mode from shortopt (possibly a bunch mushed together)
            -[^-]*)
              for (( j = 0; j < ${#w}; j++ )); do
                case ${w:j:1} in
                  d|i|m|s|u)
                    mode=${w:j:1}
                    ;;
                esac
              done
              ;;
            # mode from long opt
            --@(download|info|?(m)search|update))
              mode=${w#--}
              ;;
          esac
        fi
      done
      case $mode in
        d|download|i|info)
          # complete based on AUR matches
          if (( ${#cur} > 2 )); then
            COMPREPLY=($(compgen -W "$("$argv0" -sq -- "$cur" 2>/dev/null)" -- "$cur"))
            return 0
          fi
          ;;
        u|update)
          COMPREPLY=($(compgen -W '$(pacman -Qqm 2>/dev/null)' -- "$cur"))
          return 0
          ;;
        *)
          COMPREPLY=($(compgen -W '${allopts[*]}' -- "$cur"))
          ;;
      esac
  esac
}

complete -F _cower cower