Emerge component support

pisi/cli/emerge.py

@@ -43,6 +43,8 @@ You can also give the name of a component.
 
         group = optparse.OptionGroup(self.parser, _("emerge options"))
         super(Emerge, self).add_options(group)
+        group.add_option("-c", "--component", action="store",
+                               default=None, help=_("Emerge available packages under given component"))
         group.add_option("--ignore-file-conflicts", action="store_true",
                      default=False, help=_("Ignore file conflicts"))
         group.add_option("--ignore-package-conflicts", action="store_true",
@@ -52,15 +54,24 @@ You can also give the name of a component.
         self.parser.add_option_group(group)
 
     def run(self):
-        if not self.args:
+        self.init(database = True)
+
+        component = ctx.get_option('component')
+        if not self.args and not component:
             self.help()
             return
 
-        self.init(database = True)
+        if component:
+            componentdb = pisi.db.componentdb.ComponentDB()
+            sources = componentdb.get_union_sources(component, walk=True)
+        else:
+            sources = self.args
+
         if ctx.get_option('output_dir'):
             ctx.ui.info(_('Output directory: %s') % ctx.config.options.output_dir)
         else:
             ctx.ui.info(_('Outputting binary packages in the package cache.'))
             ctx.config.options.output_dir = ctx.config.cached_packages_dir()
 
-        pisi.api.emerge(self.args)
+        pisi.api.emerge(sources)
+