component/component.gni

# Copyright 2016 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# This defines a fuchsia_component template that builds a component from a
# manifest and an executable rule. It will package up any resources that are
# declared in the component manifest too.
# It should be used with a corresponding "component" entry in packages/gn/*
# It takes:
#   manifest: the name of the JSON manifest that defines the component
#   program: the target that produces the program executable
template("fuchsia_component") {
  # TODO(ianloic) remove Chromium's concept of components from our build system
  # and rename this to "component"

  assert(defined(invoker.manifest), "manifest must be defined for $target_name")
  # TODO(ianloic): support non-program components
  assert(defined(invoker.program) || defined(invoker.flutter_program),
         "program or flutter_program must be defined for $target_name")

  if (defined(invoker.program)) {
    program = invoker.program
    # TODO(ianloic): handle output_name being set in program
    program_name = get_label_info(program, "name")
    program_out_path = "${root_out_dir}/${program_name}"
  } else {
    assert(defined(invoker.flutter_program))
    program = invoker.flutter_program
    program_name = get_label_info(program, "name")
    program_gen_dir = get_label_info(program, "target_gen_dir")
    program_out_path = "${program_gen_dir}/${program_name}.flx"
  }

  manifest_scope = exec_script("//build/component/component_rules.py",
                               [
                                 rebase_path(invoker.manifest),
                               ],
                               "scope",
                               [
                                 invoker.manifest,
                               ])
  copy_labels = []

  program_scope = manifest_scope.program
  i = 1
  foreach(file, manifest_scope.files) {
    copy_label = "${target_name}__copy__$i"
    i = i + 1
    copy(copy_label) {
      if (file.url == program_scope.url) {
        sources = [program_out_path]
        deps = [program]
      } else {
        sources = [file.src_path]
      }
      outputs = ["${root_out_dir}/components/${file.url_as_path}"]
    }
    copy_labels += [ ":${copy_label}" ]
  }

  group(target_name) {
    deps = copy_labels
  }
}