Example of Class-less new task-type definition

I always feld weird with this syntax: PackageTask.new(...) It's a new instance, but it's bound to nothing. Often it's not clear what you are defining and some times you can't have multiple of them.
zimbatm · Sep 21, 2011 · 9c2d097 · 9c2d097
1 parent 47c6d8a
commit 9c2d097
Showing 1 changed file with 88 additions and 0 deletions.
diff --git a/lib/rake/remote_package.rb b/lib/rake/remote_package.rb
@@ -0,0 +1,88 @@
+module Rake
+  CACHE_DIR = File.expand_path ".cache" unless defined? CACHE_DIR
+  # TODO: add checksum support
+  class RemotePackage < Rake::Task
+    include Rake::DSL if defined? Rake::DSL
+
+    # Support for special github tarballs
+    GITHUB_MATCH = %r[^https?://github\.com/([^/]+)/([^/]+)/(zip|tar)ball/(.*)]
+
+    def needed?
+      ! File.exists?(local_path)
+    end
+
+    def local_path
+      File.join(CACHE_DIR, "pkg", basename)
+    end
+
+    def basename
+      if name =~ GITHUB_MATCH
+        "#{$1}-#{$2}-#{$4}#{$3 == "zip" ? ".zip" : ".tar.gz"}"
+      else
+        File.basename(name.sub(/\?.*/,''))
+      end
+    end
+
+    def execute(args=nil)
+      FileUtils.mkdir_p File.dirname(local_path)
+      sh "curl -L -o \"#{local_path}.tmp\" \"#{name}\""
+      mv "#{local_path}.tmp", local_path
+      super
+    end
+
+    # Utility
+    def unpack_to(dir)
+      abs_local_path = File.expand_path(local_path)
+      Dir.chdir(dir) do
+        case abs_local_path
+        when /\.tar\.gz$/, /\.tgz$/
+          sh "tar xzvf \"#{abs_local_path}\""
+        when /\.tar\.bz2$/
+          sh "tar xjvf \"#{abs_local_path}\""
+        when /\.tar$/
+          sh "tar xvf \"#{abs_local_path}\""
+        else
+          raise "Unsupported file extensions of #{basename}"
+        end
+      end
+    end
+
+    # Time stamp for file task.
+    def timestamp
+      if File.exist?(local_path)
+        File.mtime(local_path.to_s)
+      else
+        Rake::EARLY
+      end
+    end
+
+    class << self
+      # Apply the scope to the task name according to the rules for this kind
+      # of task.  File based tasks ignore the scope when creating the name.
+      def scope_name(scope, task_name)
+        task_name
+      end
+    end
+  end
+end
+
+# FIXME: where do I put that ?
+#
+# Usage example:
+#     ref = remote_package("http://downloads.sf.net/...")
+#
+#     build_dir = directory "build/dir"
+#
+#     task :build => [ref, build_dir] do
+#       ref.unpack_to(build_dir)
+#     end
+#
+def remote_package(*args, &block)
+  t = Rake::RemotePackage.define_task(*args, &block)
+  Rake::Task["remote_packages"].prerequisites.push(t.name).uniq!
+  t
+end
+
+# FIXME: and that ?
+desc "Downloads all remote packages"
+task :remote_packages