Add: allow filtering for which branch push notifications work (#9)

Pyup for example creates a branch in the repository.
Pushes to these branches don't have to be announced.

dorpsgek_github/modules/watcher/issue.py

@@ -27,8 +27,8 @@ async def _notify(github_api, ref, *,
     raw_yml = await get_dorpsgek_yml(github_api, repository_name, ref)
     if raw_yml:
         yml = yaml.load(raw_yml)
-        services = yml["notifications"].get("issue", {})
 
+        services = yml["notifications"].get("issue", {})
         for protocol, userdata in services.items():
             payload["userdata"] = userdata
             await watcher.send_to_watchers(protocol, "notify.issue", payload)

dorpsgek_github/modules/watcher/pull_request.py

@@ -27,8 +27,8 @@ async def _notify(github_api, ref, *,
     raw_yml = await get_dorpsgek_yml(github_api, repository_name, ref)
     if raw_yml:
         yml = yaml.load(raw_yml)
-        services = yml["notifications"].get("pull-request", {})
 
+        services = yml["notifications"].get("pull-request", {})
         for protocol, userdata in services.items():
             payload["userdata"] = userdata
             await watcher.send_to_watchers(protocol, "notify.pull_request", payload)

dorpsgek_github/modules/watcher/push.py

@@ -1,3 +1,4 @@
+import re
 import yaml
 
 from dorpsgek_github import config
@@ -46,9 +47,28 @@ async def push(event, github_api):
     raw_yml = await get_dorpsgek_yml(github_api, repository_name, ref)
     if raw_yml:
         yml = yaml.load(raw_yml)
-        services = yml["notifications"].get("push", {})
 
+        # Check if there was a filter in place for branches
+        filter_only = yml["notifications"].get("push", {}).get("only", [])
+        for filter in filter_only:
+            if re.match(filter, branch):
+                break
+        else:
+            # No match found, so we didn't match the 'only'; ignore this notification
+            return
+
+        filter_except = yml["notifications"].get("push", {}).get("except", [])
+        for filter in filter_except:
+            if re.match(filter, branch):
+                # We match the except; ignore this notification
+                return
+
+        services = yml["notifications"].get("push", {})
         for protocol, userdata in services.items():
+            # "only" and "except" are not protocols, but filters; ignore them
+            if protocol in ["only", "except"]:
+                continue
+
             payload["userdata"] = userdata
             await watcher.send_to_watchers(protocol, "notify.push", payload)