Gradle Shanty Plugin

gradle_plugin.rb

require 'english'

require 'shanty/plugin'

module Shanty
  # Public: Gradle plugin for building and testing Gradle projects.
  module GradleMultiProjectPlugin
    extend Plugin

    INCLUDE_REGEX = /include\s+((?:(?:,[\s\n\\]+)?['"][^'"]+["'])+)/
    QUOTED_ITEM_REGEX = /['"]([^'"]+)["']/
    PROJECT_COMPILE_REGEX = /compile\sproject\(['"]([^'"]+)['"]\)/

    adds_tags :gradle, :multiproject
    subscribe :build, :on_build
    subscribe :test, :on_test
    wants_projects_matching { gradle_projects }

    def self.gradle_projects
      Dir["#{root}/**/settings.gradle"].flat_map do |path|
        gradle_project_root = File.absolute_path(File.dirname(path))
        project_paths(path, gradle_project_root).map do |project_path|
          parents = dependencies(project_path, gradle_project_root)
          Project.new(File.absolute_path(project_path)).tap do |project|
            parents.each { |parent| project.parent(parent) }
          end
        end
      end
    end

    def self.project_paths(settings_path, root)
      File.read(settings_path)
        .scan(INCLUDE_REGEX)
        .flatten
        .map { |l| l.scan(QUOTED_ITEM_REGEX) } # Get the things being included, dropping the surrounding quotes.
        .flatten
        .map { |l| name_to_path(l, root) }
    end

    def self.dependencies(project_path, root)
      build_gradle_file_path = File.join(project_path, 'build.gradle')

      return [] unless File.exist?(build_gradle_file_path)
      File.read(build_gradle_file_path)
        .scan(PROJECT_COMPILE_REGEX)
        .flatten
        .map { |l| name_to_path(l, root) }
    end

    # Takes a Gradle name of the format :foo:bar:lux, and returns an absolute path to that project.
    def self.name_to_path(name, root)
      name = name[1..-1] if name[0] == ':'
      File.join(root, name.gsub(':', '/'))
    end

    def on_build
      within_project_dir do
        puts "Running `gradle assemble` for #{name}..."
        execute('gradle --info assemble 2>&1')
      end
    end

    def on_test
      within_project_dir do
        puts "Running `gradle assemble` for #{name}..."
        execute('gradle --info test 2>&1')
      end
    end

    private

    def execute(cmd)
      output = `#{cmd}`
      success = $CHILD_STATUS.exitstatus.zero?
      $stderr.puts output unless success
      success
    end
  end
end