A rb script to sync app.json (expo) version into native project files

version_synchronizer.rb

require 'json'

class BaseFileManager
  attr_reader :file_path

  def initialize(file_path)
    @file_path = file_path
  end

  def content
    @content ||= File.open(@file_path, "r").read
  end

  def commit
    file = File.open(@file_path, "w")
    file.write(content)
    file.close
  end
end

class PBXManager < BaseFileManager
  MARKETING_VERSION_RGX = /MARKETING_VERSION = (.*);/

  def set_version_name(version)
    current_version_name = MARKETING_VERSION_RGX.match(content).to_s
    new_version_name = "MARKETING_VERSION = #{version};"

    @content.gsub!(current_version_name, new_version_name)

    { current_version: current_version_name, new_version: new_version_name }
  end
end

class BuildGradleManager < BaseFileManager
  QUOTES_RGX = /(["'])(.*)(["'])/
  NAME_RGX = /versionName ('.*'|".*")/

  def set_version_name(version)
    current_version_name = NAME_RGX.match(content).to_s
    new_version_name = current_version_name.gsub(QUOTES_RGX, "\\1#{version}\\3")

    @content.gsub!(current_version_name, new_version_name)

    { current_version: current_version_name, new_version: new_version_name }
  end
end

class VersionSynchronizer

  def self.on_self_dir
    # Its expected that you put this in a subfolder, usually ./scripts
    new(root_dir: File.expand_path('..', __dir__))
  end

  def initialize(root_dir:)
    @root_dir = root_dir

    @version = JSON.parse(File.read("#{@root_dir}/app.json"))["version"]
    # FIXME: replace PROJECT_NAME with your own project name
    @pbx_manager = PBXManager.new(
      "#{@root_dir}/ios/PROJECT_NAME.xcodeproj/project.pbxproj"
    )
    @build_gradle_manager = BuildGradleManager.new(
      "#{@root_dir}/android/app/build.gradle"
    )
  end

  def sync
    dry_sync
    @pbx_manager.commit
    @build_gradle_manager.commit
  end

  def dry_sync
    pbx_changes = @pbx_manager.set_version_name(@version)
    build_gradle_changes = @build_gradle_manager.set_version_name(@version)

    puts <<~MSG
      Changes for #{@pbx_manager.file_path}:
        #{pbx_changes.values.join(' -> ')}
    MSG
    puts <<~MSG
      Changes for #{@build_gradle_manager.file_path}:
        #{build_gradle_changes.values.join(' -> ')}
    MSG
  end

  def sync_check
    pbx_changes = @pbx_manager.set_version_name(@version)
    build_gradle_changes = @build_gradle_manager.set_version_name(@version)

    if pbx_changes.values.uniq.size > 1  || build_gradle_changes.values.uniq.size > 1
      puts "Version in files not synchronized"
      puts "Please run `yarn version-sync` to sync versions & commit that"

      puts <<~MSG
        #{@pbx_manager.file_path}:
          expected #{pbx_changes[:new_version]}
          got #{pbx_changes[:current_version]}
      MSG
      puts <<~MSG
        #{@build_gradle_manager.file_path}:
          expected #{build_gradle_changes[:new_version]}
          got #{build_gradle_changes[:current_version]}
      MSG

      raise "Version strings mismatch"
    end
  end
end

then just call VersionSynchronizer.on_self_dir.sync to sync or VersionSynchronizer.on_self_dir.sync_check to check