chore: Add synth scripts for client generation (#912)

script/generate

@@ -4,10 +4,4 @@
 
 DIR=$(dirname $( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd ))
 
-URLS=(https://content.googleapis.com/discovery/v1/apis/appsmarket/v2/rest \
-      https://content.googleapis.com/discovery/v1/apis/youtubePartner/v1/rest \
-      https://content.googleapis.com/discovery/v1/apis/compute/beta/rest \
-      https://monitoring.googleapis.com/\$discovery/rest?version=v3
-)
-
-echo 'a' | bundle exec bin/generate-api gen generated --from-discovery --no-preferred-only --names-out=$DIR/api_names_out.yaml --url=${URLS[*]}
+echo 'a' | bundle exec bin/generate-api gen generated --from-discovery --no-preferred-only --names-out=$DIR/api_names_out.yaml

script/synth.rb

@@ -0,0 +1,23 @@
+#!/usr/bin/env ruby
+
+require "fileutils"
+
+DIR = File.dirname __dir__
+
+def execute cmd
+  puts cmd
+  abort unless system cmd
+end
+
+execute "bundle install"
+
+if ARGV.empty?
+  execute "echo a | bundle exec bin/generate-api gen generated --from-discovery --no-preferred-only --names-out=#{DIR}/api_names_out.yaml"
+elsif ARGV == ["--clean"]
+  execute "bundle exec bin/generate-api gen generated --clean"
+elsif ARGV.size == 2
+  api, version = ARGV
+  execute "echo a | bundle exec bin/generate-api gen generated --api=#{api}.#{version} --names-out=#{DIR}/api_names_out.yaml"
+else
+  abort "Bad arguments: #{ARGV}"
+end