# Copyright 2023 The Pigweed Authors
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.

import("//build_overrides/pigweed.gni")

import("$dir_pw_build/gn_internal/build_target.gni")
import("$dir_pw_rust/rust.gni")

# Note: In general, prefer to import target_types.gni rather than this file.
#
# This template wraps a configurable target type specified by the current
# toolchain to be used for all pw_rust_executable targets. This allows projects
# to stamp out unique build logic for each pw_rust_executable target.
# This wrapper is analogous to pw_executable with additions to support rust
# specific parameters such as rust edition and cargo config features.
#
# Default configs, default visibility, and link deps are applied to the target
# before forwarding to the underlying type as specified by
# pw_build_EXECUTABLE_TARGET_TYPE.
#
# For more information on the features provided by this template, see the full
# docs at https://pigweed.dev/pw_build/?highlight=pw_rust_executable.
template("pw_rust_executable") {
  pw_internal_build_target(target_name) {
    forward_variables_from(invoker, "*")

    _edition = "2021"
    if (defined(invoker.edition)) {
      _edition = invoker.edition
    }
    assert(_edition == "2015" || _edition == "2018" || _edition == "2021" ||
               _edition == "2024",
           "edition ${_edition} is not supported")

    if (!defined(configs)) {
      configs = []
    }
    configs += [ "$dir_pw_build:rust_edition_${_edition}" ]

    if (!defined(rustflags)) {
      rustflags = []
    }
    if (defined(features)) {
      foreach(i, features) {
        rustflags += [ "--cfg=feature=\"${i}\"" ]
      }
    }

    output_dir = "${target_out_dir}/bin"
    if (defined(invoker.output_dir)) {
      output_dir = invoker.output_dir
    }

    underlying_target_type = pw_build_EXECUTABLE_TARGET_TYPE
    target_type_file = pw_build_EXECUTABLE_TARGET_TYPE_FILE
    add_global_link_deps = true
  }
}