#compdef meson

# vim:ts=2 sw=2

# Copyright (c) 2017 Arseny Maslennikov
# All rights reserved.  Individual authors, whether or not
# specifically named, retain copyright in all changes; in what follows, they
# are referred to as `the Meson development team'.  This is for convenience
# only and this body has no legal status.  This file is distributed under
# the following licence.
#
# Permission is hereby granted, without written agreement and without
# licence or royalty fees, to use, copy, modify, and distribute this
# software and to distribute modified versions of this software for any
# purpose, provided that the above copyright notice and the following
# two paragraphs appear in all copies of this software.
#
# In no event shall the Meson development team be liable to any party for
# direct, indirect, special, incidental, or consequential damages arising out
# of the use of this software and its documentation, even if the Meson
# development team have been advised of the possibility of such damage.
#
# The Meson development team specifically disclaim any warranties, including,
# but not limited to, the implied warranties of merchantability and fitness
# for a particular purpose.  The software provided hereunder is on an "as is"
# basis, and the Meson development team have no obligation to provide
# maintenance, support, updates, enhancements, or modifications.

local curcontext="$curcontext" state line
local -i ret

local __meson_backends="(ninja xcode ${(j. .)${:-vs{,2010,2015,2017}}})"
local __meson_build_types="(plain debug debugoptimized minsize release)"
local __meson_wrap_modes="(WrapMode.{default,nofallback,nodownload,forcefallback})"

local -a meson_commands=(
'setup:set up a build directory'
'configure:configure a project'
'test:run tests'
'introspect:query project properties'
'wrap:manage source dependencies'
)

(( $+functions[__meson_is_build_dir] )) || __meson_is_build_dir() {
  local mpd="${1:-$PWD}/meson-private"
  [[ -f "$mpd/build.dat" && -f "$mpd/coredata.dat" ]]
  return $?
}

# TODO: implement build option completion
(( $+functions[__meson_build_options] )) || __meson_build_options() {}

# `meson introspect` currently can provide that information in JSON.
# We can:
# 1) pipe its output to python3 -m json.tool | grep "$alovelyregex" | cut <...>
# 2) teach mintro.py to use a different output format
#    (or perhaps just to select the fields printed)

(( $+functions[__meson_test_names] )) || __meson_test_names() {
  local rtests
  if rtests="$(_call_program meson meson test ${opt_args[-C]:+-C "$opt_args[-C]"} --list)";
  then
    local -a tests=(${(@f)rtests})
    _describe -t "tests" "Meson tests" tests
  else
    _message -r "current working directory is not a build directory"
    _message -r 'use -C $build_dir or cd $build_dir'
  fi
}

(( $+functions[_meson_commands] )) || _meson_commands() {
    _describe -t commands "Meson subcommands" meson_commands
}

(( $+functions[_meson-setup] )) || _meson-setup() {
  local firstd secondd
  if [[ -f "meson.build" ]]; then
    # if there's no second argument on the command line
    # cwd will implicitly be substituted:
    # - as the source directory if it has a file with the name "meson.build";
    # - as the build directory otherwise
    # more info in mesonbuild/mesonmain.py
    firstd="build"
    secondd="source"
  else
    firstd="source"
    secondd="build"
  fi

  _arguments \
  '*-D-[set the value of a build option]:build option:__meson_build_options' \
  '--prefix=[installation prefix]: :_directories' \
  '--bindir=[executable directory]: :_directories' \
  '--datadir=[data file directory]: :_directories' \
  '--includedir=[header file directory]: :_directories' \
  '--infodir=[info page directory]: :_directories' \
  '--libdir=[library directory]: :_directories' \
  '--libexecdir=[library executable directory]: :_directories' \
  '--localedir=[locale data directory]: :_directories' \
  '--localstatedir=[local state data directory]: :_directories' \
  '--mandir=[manual page directory]: :_directories' \
  '--sbindir=[system executable directory]: :_directories' \
  '--sharedstatedir=[arch-independent data directory]: :_directories' \
  '--sysconfdir=[system configuration directory]: :_directories' \
  '--auto-features=[default value for auto features]:auto features types:(auto disabled enabled)' \
  '--backend=[backend to use]:Meson backend:'"$__meson_backends" \
  '--buildtype=[build type to use]:Meson build type:'"$__meson_build_types" \
  '--debug=[turn on building with debug]' \
  '--default-library=[default library type]:default library type:(shared static both)' \
  '--errorlogs=[prints the logs from failing tests]' \
  '--install-umask=[default umask for permissions of all installed files]' \
  '--layout=[build directory layout]:build directory layout:(flat mirror)' \
  '--optimization=[optimization level for compiled targets]:optimization:(0 g 1 2 3 s)' \
  '--stdsplit=[split stdout and stderr in test logs]' \
  '--strip[strip targets on install]' \
  '--unity=[unity builds on/off]:whether to do unity builds:(on off subprojects)' \
  '--warnlevel=[compiler warning level]:compiler warning level:warning level:(1 2 3)' \
  '--werror[treat warnings as errors]' \
  '--wrap-mode=[special wrap mode]:wrap mode:'"$__meson_wrap_modes" \
  '--force-fallback-for=[force fallback for listed subprojects]' \
  '--pkg-config-path=[extra paths for HOST pkg-config to search]:paths:_files -/' \
  '--build.pkg-config-path=[extra paths for BUILD pkg-config to search]:paths:_files -/' \
  '--cmake-prefix-path=[extra prefixes for HOST cmake to search]:paths:_files -/' \
  '--build.cmake-prefix-path=[extra prefix for BUILD cmake to search]:paths:_files -/' \
  '--cross-file=[cross-compilation environment description]:cross file:_files' \
  '--native-file=[build machine compilation environment description]:native file:_files' \
  '--clearcache[clear cached state]' \
  '--fatal-meson-warnings=[exit when any meson warnings are encountered]' \
  '(-v --version)'{'-v','--version'}'[print the meson version and exit]' \
  '--reconfigure=[re-run build configuration]' \
  '--wipe=[delete saved state and restart using saved command line options]' \
  ":$firstd directory:_directories" \
  "::$secondd directory:_directories" \
  #
}

(( $+functions[_meson-configure] )) || _meson-configure() {
  local curcontext="$curcontext"
  # TODO: implement 'mesonconf @file'
  local -a specs=(
  '--clearcache[clear cached state]'
  '*-D-[set the value of a build option]:build option:__meson_build_options'
  '::build directory:_directories'
  )

  _arguments \
    '(: -)'{'--help','-h'}'[show a help message and quit]' \
    "${(@)specs}"
}

(( $+functions[_meson-test] )) || _meson-test() {
  local curcontext="$curcontext"

  # TODO: complete test suites
  local -a specs=(
  '(--quiet -q)'{'--quiet','-q'}'[produce less output to the terminal]'
  '(--verbose -v)'{'--verbose','-v'}'[do not redirect stdout and stderr]'
  '(--timeout-multiplier -t)'{'--timeout-multiplier','-t'}'[a multiplier for test timeouts]:Python floating-point number: '
  '-C[directory to cd into]: :_directories'
  '--repeat[number of times to run the tests]:number of times to repeat: '
  '--no-rebuild[do not rebuild before running tests]'
  '--gdb[run tests under gdb]'
  '--list[list available tests]'
  '(--wrapper --wrap)'{'--wrapper=','--wrap='}'[wrapper to run tests with]:wrapper program:_path_commands'
  '(--no-suite)--suite[only run tests from this suite]:test suite: '
  '(--suite)--no-suite[do not run tests from this suite]:test suite: '
  '--no-stdsplit[do not split stderr and stdout in logs]'
  '--print-errorlogs[print logs for failing tests]'
  '--benchmark[run benchmarks instead of tests]'
  '--logbase[base name for log file]:filename: '
  '--num-processes[how many threads to use]:number of processes: '
  '--setup[which test setup to use]:test setup: '
  '--test-args[arguments to pass to the tests]: : '
  '*:Meson tests:__meson_test_names'
  )

  _arguments \
    '(: -)'{'--help','-h'}'[show a help message and quit]' \
    "${(@)specs}"
}

(( $+functions[_meson-introspect] )) || _meson-introspect() {
  local curcontext="$curcontext"
  local -a specs=(
  '--targets[list top level targets]'
  '--installed[list all installed files and directories]'
  '--buildsystem-files[list files that belong to the build system]'
  '--buildoptions[list all build options]'
  '--tests[list all unit tests]'
  '--benchmarks[list all benchmarks]'
  '--dependencies[list external dependencies]'
  '--projectinfo[show project information]'
  '::build directory:_directories'
  )
_arguments \
  '(: -)'{'--help','-h'}'[show a help message and quit]' \
  "${(@)specs}"
}

(( $+functions[_meson-wrap] )) || _meson-wrap() {
  # TODO
}

if [[ $service != meson ]]; then
  _call_function ret _$service
  return ret
fi

_arguments -C -R \
  '(: -)'{'--help','-h'}'[show a help message and quit]' \
  '(: -)'{'--version','-v'}'[show version information and quit]' \
  '(-): :_meson_commands' \
  '*:: :->post-command' \
#
ret=$?

[[ $ret = 300 ]] && case "$state" in
  post-command)
    service="meson-$words[1]"
    curcontext=${curcontext%:*:*}:$service:
    _call_function ret _$service
    ;;
esac

return ret