# Copyright 2022 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.

import("//build/compiled_action.gni")

# Generates a machine-readable, JSON-formatted, FIDL API summary.
#
# For details on the FIDL API summary format, see RFC-0076 at:
# https://fuchsia.dev/fuchsia-src/contribute/governance/rfcs/0076_fidl_api_summaries
#
# Args:
#
# inputs: list(label)
#   A singleton list naming the FIDL IR file to read.
#
# outputs: list(label)
#   A singleton naming the output API summary file to generate.
#
# applicable_licenses: list(label)
# testonly: bool(optional)
# deps: list(label)
# visiblility: list(label)
template("fidl_summary_json") {
  compiled_action("${target_name}") {
    forward_variables_from(invoker,
                           [
                             "applicable_licenses",
                             "appl",
                             "testonly",
                             "deps",
                             "metadata",
                             "inputs",
                             "outputs",
                             "visibility",
                           ])

    assert(defined(inputs), "inputs is required")
    assert(inputs != [] && inputs == [ inputs[0] ],
           "inputs must have exactly one element")
    _json_representation = inputs[0]

    assert(defined(outputs), "outputs is required")
    assert(defined(outputs) && outputs != [] && outputs == [ outputs[0] ],
           "outputs must have exactly one element")
    _summary_file_json = outputs[0]

    tool = "//tools/fidl/fidl_api_summarize"
    args = [
      "--fidl-ir-file",
      rebase_path(_json_representation, root_build_dir),
      "--output-file",
      rebase_path(_summary_file_json, root_build_dir),
      "--suppress-empty-library",
    ]
  }
}