Command parser: allow @bors:

Commands that started with the botname *and then a colon* were being
dropped, because the parser didn't recognize the command and didn't
continue. Fix this by explicitely allowing a colon after the botname.

homu/parse_issue_comment.py

@@ -174,6 +174,9 @@ def parse_issue_comment(username, body, sha, botname, hooks=[]):
         if word == '@' + botname:
             continue
 
+        if word == '@' + botname + ':':
+            continue
+
         if word == 'r+' or word.startswith('r='):
             approved_sha = sha
 

homu/tests/test_parse_issue_comment.py

@@ -21,6 +21,22 @@ def test_r_plus():
     assert command.actor == 'jack'
 
 
+def test_r_plus_with_colon():
+    """
+    @bors: r+
+    """
+
+    author = "jack"
+    body = "@bors: r+"
+    commands = parse_issue_comment(author, body, commit, "bors")
+
+    assert len(commands) == 1
+    command = commands[0]
+    assert command.action == 'approve'
+    assert command.actor == 'jack'
+    assert command.commit == commit
+
+
 def test_r_plus_with_sha():
     """
     @bors r+ {sha}