Ensure codegen runs at Xcode buildtime

Summary: Changelog:

Differential Revision: D25138896

fbshipit-source-id: 222353bd6ecb56928a2994baea2c393e6926283c

Libraries/FBReactNativeSpec/FBReactNativeSpec.podspec

@@ -9,9 +9,11 @@ package = JSON.parse(File.read(File.join(__dir__, "..", "..", "package.json")))
 version = package['version']
 
 source = { :git => 'https://github.com/facebook/react-native.git' }
+scripts_path = "../../node_modules/react-native/scripts"
 if version == '1000.0.0'
   # This is an unpublished version, use the latest commit hash of the react-native repo, which we’re presumably in.
   source[:commit] = `git rev-parse HEAD`.strip
+  scripts_path = "../../scripts"
 else
   source[:tag] = "v#{version}"
 end
@@ -44,4 +46,6 @@ Pod::Spec.new do |s|
   s.dependency "React-Core", version
   s.dependency "React-jsi", version
   s.dependency "ReactCommon/turbomodule/core", version
+
+  s.script_phase = { :name => 'Generate Native Modules Code', :output_files => ['FBReactNativeSpec/FBReactNativeSpec.h', 'FBReactNativeSpec/FBReactNativeSpec-generated.mm'], :script => 'ruby "$(scripts_path)/codegen-native-modules.rb"', :execution_position => :before_compile}
 end

scripts/codegen-native-modules.rb

@@ -0,0 +1,8 @@
+# Copyright (c) Facebook, Inc. and its affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+require_relative 'react_native_pods'
+
+codegen_core_modules()

scripts/react_native_pods.rb

@@ -3,6 +3,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+require 'tmpdir'
+
 def use_react_native! (options={})
   # The prefix to the react-native
   prefix = options[:path] ||= "../node_modules/react-native"
@@ -111,18 +113,26 @@ def flipper_post_install(installer)
 
 # Pre Install processing for Native Modules
 def codegen_pre_install(installer, options={})
-  # Path to React Native
-  prefix = options[:path] ||= "../node_modules/react-native"
+  codegen_core_modules(options)
+end
+
+# Handle Core Modules
+def codegen_core_modules(options={})
+  prefix = options[:path] ||= "../../node_modules/react-native"
+  codegen_path = options[:codegen_path] ||= "#{prefix}/../react-native-codegen"
+  library_name = options[:library_name] ||= "FBReactNativeSpec"
+  output_dir = options[:output_dir] ||= "#{prefix}/Libraries/#{library_name}/#{library_name}"
+  srcs_dir = "#{prefix}/Libraries"
+
+  codegen(prefix, srcs_dir, library_name, output_dir, options)
+end
 
-  # Path to react-native-codegen
+def codegen(prefix, srcs_dir, library_name, output_dir, options)
   codegen_path = options[:codegen_path] ||= "#{prefix}/../react-native-codegen"
 
-  # Handle Core Modules
   Dir.mktmpdir do |dir|
-    native_module_spec_name = "FBReactNativeSpec"
-    schema_file = dir + "/schema-#{native_module_spec_name}.json"
-    srcs_dir = "#{prefix}/Libraries"
+    schema_file = dir + "/schema-#{library_name}.json"
     schema_generated = system("node #{codegen_path}/lib/cli/combine/combine-js-to-schema-cli.js #{schema_file} #{srcs_dir}") or raise "Could not generate Native Module schema"
-    specs_generated = system("node #{prefix}/scripts/generate-native-modules-specs-cli.js ios #{schema_file} #{srcs_dir}/#{native_module_spec_name}/#{native_module_spec_name}") or raise "Could not generate code for #{native_module_spec_name}"
+    specs_generated = system("node #{prefix}/scripts/generate-native-modules-specs-cli.js ios #{schema_file} #{output_dir} #{library_name}") or raise "Could not generate code for #{library_name}"
   end
 end