[meld] Make Git 'update' command (pull) path-less (bgo#698564)

[Kai Willadsen <kaiw src gnome org>]

commit 03012e4d3843ff1c855747f6e1347ed23e6be8de
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Sat Apr 27 14:27:32 2013 +1000

    Make Git 'update' command (pull) path-less (bgo#698564)
    
    Since it's not actually possible to do this under the existing VC
    interaction model, this commit includes the start of a new interface
    to the VC modules. In this interface, the command is called by the
    VC module, which is passed a 'runner' - essentially just a method
    that takes a command list and a files list and runs the result.
    
    The runner interface will probably have to change to require a
    subprocess-style list of all arguments, but the current way is much
    easier to hook in to existing code.

 meld/vc/git.py |    6 ++++++
 meld/vcview.py |    5 ++++-
 2 files changed, 10 insertions(+), 1 deletions(-)
---
diff --git a/meld/vc/git.py b/meld/vc/git.py
index 382c761..c8a1cf6 100644
--- a/meld/vc/git.py
+++ b/meld/vc/git.py
@@ -90,6 +90,12 @@ class Vc(_vc.CachedVc):
     def revert_command(self):
         return [self.CMD,"checkout"]
 
+    # Prototyping VC interface version 2
+
+    def update(self, runner, files):
+        command = [self.CMD, 'pull']
+        runner(command, [], refresh=True, working_dir=self.root)
+
     def get_path_for_conflict(self, path, conflict):
         if not path.startswith(self.root + os.path.sep):
             raise _vc.InvalidVCPath(self, path, "Path not in repository")
diff --git a/meld/vcview.py b/meld/vcview.py
index 83e4e99..0a30cd8 100644
--- a/meld/vcview.py
+++ b/meld/vcview.py
@@ -682,7 +682,10 @@ class VcView(melddoc.MeldDoc, gnomeglade.Component):
             self._command(command, files, refresh)
 
     def on_button_update_clicked(self, obj):
-        self._command_on_selected(self.vc.update_command())
+        try:
+            self.vc.update(self._command, self._get_selected_files())
+        except AttributeError:
+            self._command_on_selected(self.vc.update_command())
 
     def on_button_commit_clicked(self, obj):
         CommitDialog(self).run()