Script for generate change logs from app/build.gradle.

changelog_generator.rb

#!/usr/bin/env ruby

app_version = ''
file_names = []
changelog_contens_ja = []
changelog_contens_en = []
gradle_path = '../app/build.gradle'

# These files are base change log.
changelog_path_ja = '../change_log_ja.txt'
changelog_path_en = '../change_log_en.txt'

# Change log output paths.
output_path_ja = '../metadata/ja-JP/changelogs/'
output_path_en = '../metadata/en-US/changelogs/'

begin
  # Create file names.
    File.open(gradle_path) do |gradle|
        gradle.each_line do |line|
            if line.include?('versionCode')
                app_version = line.gsub(/[^0-9]/, '').to_s
                file_names.push('1' + app_version, '2' + app_version, '3' + app_version, '4' + app_version, '5' + app_version, '6' + app_version)
                break
            end
        end
        # Read change log from file and push into array.
        File.open(changelog_path_ja) do |file|
            file.each_line do |changelog|
                changelog_contens_ja.push(changelog)
            end
        end
        # Create change log files for each apk version codes.(Because of I use split apk feature.)
        file_names.each do |file_name|
            File.open(output_path_ja + file_name + '.txt', 'w') do |output_file|
                changelog_contens_ja.each { |s| output_file.puts(s) }
            end
        end
        # Do previous sequences for English change log.
        File.open(changelog_path_en) do |file|
            file.each_line do |changelog|
                changelog_contens_en.push(changelog)
            end
        end
        file_names.each do |file_name|
            File.open(output_path_en + file_name + '.txt', 'w') do |output_file|
                changelog_contens_en.each { |s| output_file.puts(s) }
            end
        end
    end
    puts 'done!'
end