1 files changed, 74 insertions, 0 deletions
diff --git a/Library/Homebrew/cmd/unpack.rb b/Library/Homebrew/cmd/unpack.rb
new file mode 100644
index 000000000..ec9b0a126
--- /dev/null
+++ b/Library/Homebrew/cmd/unpack.rb
@@ -0,0 +1,74 @@
+require "stringio"
+require "formula"
+
+module Homebrew
+  extend self
+
+  module DATALoader
+    # Original code from http://stackoverflow.com/a/2157556/371237
+    def self.load(path)
+      data = StringIO.new
+      path.open("r") do |f|
+        begin
+          line = f.gets
+        end until line.nil? || /^__END__$/ === line
+        data << line while line = f.gets
+      end
+      data.rewind
+      data
+    end
+  end
+
+  module UnpackPatch
+    def patch
+      return unless ARGV.flag? "--patch"
+
+      begin
+        old_verbose, $VERBOSE = $VERBOSE, nil
+        Object.const_set "DATA", DATALoader.load(path)
+      ensure
+        $VERBOSE = old_verbose
+      end
+
+      super
+    end
+  end
+
+  def unpack
+    formulae = ARGV.formulae
+    raise FormulaUnspecifiedError if formulae.empty?
+
+    if dir = ARGV.value("destdir")
+      unpack_dir = Pathname.new(dir)
+      unpack_dir.mkpath
+    else
+      unpack_dir = Pathname.pwd
+    end
+
+    raise "Cannot write to #{unpack_dir}" unless unpack_dir.writable_real?
+
+    formulae.each do |f|
+      f.extend(UnpackPatch)
+      stage_dir = unpack_dir.join("#{f.name}-#{f.version}")
+
+      if stage_dir.exist?
+        raise "Destination #{stage_dir} already exists!" unless ARGV.force?
+        rm_rf stage_dir
+      end
+
+      oh1 "Unpacking #{f.name} to: #{stage_dir}"
+
+      ENV['VERBOSE'] = '1' # show messages about tar
+      f.brew { cp_r getwd, stage_dir }
+      ENV['VERBOSE'] = nil
+
+      if ARGV.flag? "--git"
+        ohai "Setting up git repository"
+        cd stage_dir
+        system "git", "init", "-q"
+        system "git", "add", "-A"
+        system "git", "commit", "-q", "-m", "brew-unpack"
+      end
+    end
+  end
+end