# Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# Add programmable completion to some Chromium OS build scripts

# Declare one cache for all bash complete operations to
# allow it to be easiley cleared if need be.
# > unset _comp_cache
declare -A _comp_cache

# Usage: cros --help | _subcmds_from_help
# Parse subcommands from a commands's help message.
# Trims the help outputs after it see any token with "command"
# in it. Then, it searches for a no-space bracketed token,
# similar to the following:
# {subcmd1,subcmd2,subcmd3}
_subcmds_from_help() {
  sed -n -e '/commands:/,$p' \
    | egrep -o '\{[[:alnum:]_,-]+\}' | sort -u \
    | tr -d '{}' | tr ',' ' '
  return ${PIPESTATUS[0]}
}

# Echo a list of -- flags that the current command accepts. The
# function assumes that the command supports shflags' --help flag.
_flags() {
  command "$@" --help 2>&1 \
    | egrep -o -- '--(\[no\])?[[:alnum:]=_-]+' \
    | sed -E -e 's|--\[no\](.+)|--\1 --no\1|'
}

# Complete flags, i.e., current words starting with --. Return 1 if
# the current word doesn't start with --, 0 otherwise.
_complete_flag_help() {
  COMPREPLY=()
  local cur="${COMP_WORDS[COMP_CWORD]}"
  if [[ "${cur}" == --* ]]; then
    local key="flags/${COMP_WORDS[0]}"
    if [[ -z "${_comp_cache[${key}]}" ]]; then
      _comp_cache[${key}]="$(_flags "${COMP_WORDS[0]}")"
    fi
    COMPREPLY=( $(compgen -W "${_comp_cache[${key}]}" -- "${cur}") )
    return 0
  fi
  return 1
}

# Look for "--arg=foo" or "--arg foo" (where foo can be an empty string) in the
# word to be completed. If found, echo "--arg=foo".
_argeq() {
  local arg=$1
  local w0="${COMP_WORDS[COMP_CWORD]}"
  local w1="${COMP_WORDS[COMP_CWORD-1]}"

  # Check for completing "--arg="
  if [ "${w1}" == ${arg} -a "${w0}" == "=" ]; then
    echo "${w1}${w0}"
    return 0
  fi

  # Check for completing "--arg foo"
  if [ "${w1}" == ${arg} ]; then
    echo "${w1}=${w0}"
    return 0
  fi

  # Check for completing "--arg=foo"
  if [ ${COMP_CWORD} -gt 2 ]; then
    local w2="${COMP_WORDS[COMP_CWORD-2]}"
    if [ "${w2}" == ${arg} -a "${w1}" == "=" ]; then
      echo "${w2}${w1}${w0}"
      return 0
    fi
  fi
}


# echo the existing target board sysroots
_board_sysroots() {
  local builddir=/build
  if [ -d ${builddir} ]; then
    echo $(command ls "${builddir}")
  fi
}

_complete_board_sysroot_flag() {
  COMPREPLY=()
  local arg=$(_argeq --board)
  if [[ ${arg} == --board=* ]]; then
    COMPREPLY=( $(compgen -W "$(_board_sysroots)" -- ${arg#--board=}) )
    return 0
  fi
  return 1
}

# Completion for --board= argument for existing board sysroots
_complete_basic() {
  _complete_flag_help && return 0
  _complete_board_sysroot_flag && return 0
}

# echo the existing target board overlays
_board_overlays() {
  local overlaydir=../overlays
  if [ -d ${overlaydir} ]; then
    echo $(command ls $overlaydir | grep overlay- | sed s,overlay-,,)
  fi
}

# Completion for --board= argument for existing board overlays
_board_overlay() {
  _complete_flag_help && return 0

  COMPREPLY=()
  local arg=$(_argeq --board)
  if [[ ${arg} == --board=* ]]; then
    COMPREPLY=( $(compgen -W "$(_board_overlays)" -- ${arg#--board=}) )
  fi
}

# Completion for -c and -s argument for autotest script
_ls_autotest() {
  local autotest_dir=../third_party/autotest/files
  ls --color=never -dBFH ${autotest_dir}/$1* 2>/dev/null \
    | sed s/"..\/third_party\/autotest\/files\/"//g
}

_autotest_complete() {
  _complete_flag_help && return 0

  local arg=$(_argeq -c)
  if [[ ${arg} == -c=* ]]; then
    COMPREPLY=($(compgen -W "$(_ls_autotest ${arg#-c=})"))
    return 0
  fi

  arg=$(_argeq -s)
  if [[ ${arg} == -s=* ]]; then
    COMPREPLY=($(compgen -W "$(_ls_autotest ${arg#-s=})"))
    return 0
  fi

  _complete_board_sysroot_flag && return 0
}

_test_that_complete() {
  _complete_flag_help && return 0
  return 0
}

# Complete cros_workon's <command> argument.
#
# TODO(petkov): We should probably extract the list of commands from
# cros_workon --help, just like we do for flags (see _complete_flag_help).
#
# TODO(petkov): Currently, this assumes that the command is the first
# argument. In practice, the command is the first non-flag
# argument. I.e., this should be fixed to support something like
# "cros_workon --all list".
_complete_cros_workon_command() {
  [ ${COMP_CWORD} -eq 1 ] || return 1
  local command="${COMP_WORDS[1]}"

  # TODO(hesling): Local scoped references to associative arrays
  # seems to be broken in bash version 4.3.48, but working in version 5.
  # We can beautify this by using the following command, when cros bash
  # is updated.
  # local -n cache="_comp_cache[subcmds/cros_workon]"

  local key="subcmds/cros_workon"
  if [[ -z "${_comp_cache[${key}]}" ]]; then
    _comp_cache[${key}]="$(command cros_workon --help | _subcmds_from_help)"
  fi
  COMPREPLY=($(compgen -W "${_comp_cache[${key}]}" -- "${command}"))
  return 0
}

# Prints the full path to the cros_workon executable, handling tilde
# expansion for the current user.
_cros_workon_executable() {
  local cros_workon="${COMP_WORDS[0]}"
  if [[ "$cros_workon" == '~/'* ]]; then
    cros_workon="$HOME/${cros_workon#'~/'}"
  fi
  echo "$cros_workon"
}

# Lists the workon (or live, if --all is passed in) ebuilds. Lists
# both the full names (e.g., chromeos-base/metrics) as well as just
# the ebuild names (e.g., metrics).
_cros_workon_list() {
  local cros_workon=$(_cros_workon_executable)
  ${cros_workon} $1 list | sed 's,\(.\+\)/\(.\+\),\1/\2 \2,'
}

# Completes the current cros_workon argument assuming it's a
# package/ebuild name.
_complete_cros_workon_package() {
  [ ${COMP_CWORD} -gt 1 ] || return 1
  local package="${COMP_WORDS[COMP_CWORD]}"
  local command="${COMP_WORDS[1]}"
  # If "start", complete based on all workon packages.
  if [[ ${command} == "start" ]]; then
    local key="pkgs/all"
    if [[ -z "${_comp_cache[${key}]}" ]]; then
      _comp_cache[${key}]="$(_cros_workon_list --all)"
    fi
    COMPREPLY=($(compgen -W "${_comp_cache[${key}]}" -- "${package}"))
    return 0
  fi
  # If "stop" or "iterate", complete based on all live packages.
  if [[ ${command} == "stop" ]] || [[ ${command} == "iterate" ]]; then
    COMPREPLY=($(compgen -W "$(_cros_workon_list)" -- "$package"))
    return 0
  fi
  return 1
}

# Complete cros_workon arguments.
_cros_workon() {
  COMPREPLY=()
  _complete_flag_help && return 0
  _complete_board_sysroot_flag && return 0
  _complete_cros_workon_command && return 0
  _complete_cros_workon_package && return 0
  return 0
}

_complete_cros_command() {
  local command="${COMP_WORDS[COMP_CWORD]}"
  if [ ${COMP_CWORD} -ne 1 ]; then
    return 1
  fi

  local key="subcmds/cros"
  if [[ -z "${_comp_cache[${key}]}" ]]; then
    _comp_cache[${key}]="$(command cros --help | _subcmds_from_help)"
  fi
  COMPREPLY=($(compgen -W "${_comp_cache[${key}]}" -- "${command}"))
  return 0
}

# Complete cros arguments.
_cros() {
  COMPREPLY=()
  _complete_flag_help && return 0
  _complete_board_sysroot_flag && return 0
  _complete_cros_command && return 0
  # TODO(hesling): Add package completion like cros_workon.
  return 0
}

# Complete equery's <module-name> argument.
_complete_equery_module_name() {
  [ ${COMP_CWORD} -eq 1 ] || return 1
  local command="${COMP_WORDS[1]}"
  COMPREPLY=($(compgen -W "belongs changes check depends depgraph files has \
                           hasuse keywords list meta size uses which" \
                           -- "$command"))
  return 0
}

# Complete equery arguments.
_complete_equery() {
  COMPREPLY=()
  _complete_equery_module_name && return 0
  return 0
}

complete -o bashdefault -o default -F _complete_basic \
  build_autotest.sh \
  build_image \
  build_packages \
  mod_image_for_test.sh \
  cros_portage_upgrade

complete -o bashdefault -o default -F _board_overlay setup_board
complete -o bashdefault -o default -o nospace -F _autotest_complete autotest
complete -o bashdefault -o default -o nospace -F _test_that_complete test_that
complete -o bashdefault -o default -F _cros cros
complete -F _cros_workon cros_workon
complete -o bashdefault -o default -F _complete_equery equery

# Use equery completion for equery-$board for known boards
_boardlist=$(cros_list_overlays | egrep "^.*/overlays/overlay-.*$" |
             sed -n "s/.*overlay-//p")
for board in $_boardlist; do
  complete -o bashdefault -o default -F _complete_equery equery-$board
done

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