Refactor some generic stuff out of darcs into packagesource

1 files changed, 28 insertions, 0 deletions

diff --git a/modules/packagesource.py b/modules/packagesource.py
index d556ef5..b0b87b8 100644
--- a/modules/packagesource.py
+++ b/modules/packagesource.py
@@ -74,6 +74,34 @@ class PackageSource(Directory):
         '''
         return join(self.dir, self.source)
 
+    @contextmanager
+    def src_dir(self, *args):
+        '''executes a code block inside a specific branch and or checkout
+        '''
+        with src(*args):
+            with pwd(self.source_dir):
+                yield
+
+    @contextmanager
+    def src(self, *args):
+        '''executes a code block with a particular branch or checkout
+
+        if there are no args, this block is executed in the raw
+        '''
+        if args:
+            old_src = self.cfg['source']
+            self.set_cur_to(*args)
+        yield
+        if args:
+            self.cfg['source'] = old_src
+            self.set_current_src()
+
+    def set_current_src(self):
+        raise NotImplementedError
+
+    def set_cur_to(self, *args):
+        raise NotImplementedError
+
     def branch(self, *args):
         raise NotImplementedError