brew/Library/Homebrew/dev-cmd/unpack.rb

# typed: strict
# frozen_string_literal: true

require "abstract_command"
require "fileutils"
require "stringio"
require "formula"

module Homebrew
  module DevCmd
    class Unpack < AbstractCommand
      include FileUtils

      cmd_args do
        description <<~EOS
          Unpack the source files for <formula> into subdirectories of the current
          working directory.
        EOS
        flag   "--destdir=",
               description: "Create subdirectories in the directory named by <path> instead."
        switch "--patch",
               description: "Patches for <formula> will be applied to the unpacked source."
        switch "-g", "--git",
               description: "Initialise a Git repository in the unpacked source. This is useful for creating " \
                            "patches for the software."
        switch "-f", "--force",
               description: "Overwrite the destination directory if it already exists."

        conflicts "--git", "--patch"

        named_args :formula, min: 1
      end

      sig { override.void }
      def run
        formulae = args.named.to_formulae

        if (dir = args.destdir)
          unpack_dir = Pathname.new(dir).expand_path
          unpack_dir.mkpath
        else
          unpack_dir = Pathname.pwd
        end

        odie "Cannot write to #{unpack_dir}" unless unpack_dir.writable?

        formulae.each do |f|
          stage_dir = unpack_dir/"#{f.name}-#{f.version}"

          if stage_dir.exist?
            odie "Destination #{stage_dir} already exists!" unless args.force?

            rm_rf stage_dir
          end

          oh1 "Unpacking #{Formatter.identifier(f.full_name)} to: #{stage_dir}"

          # show messages about tar
          with_env VERBOSE: "1" do
            f.brew do
              f.patch if args.patch?
              cp_r getwd, stage_dir, preserve: true
            end
          end

          next unless args.git?

          ohai "Setting up Git repository"
          cd(stage_dir) do
            system "git", "init", "-q"
            system "git", "add", "-A"
            system "git", "commit", "-q", "-m", "brew-unpack"
          end
        end
      end
    end
  end
end