From b2d0979050cebab19f2d163dec0f9205f170f1c2 Mon Sep 17 00:00:00 2001
From: Tobias Witek <tobi@tobi-wan-kenobi.at>
Date: Thu, 7 Sep 2017 05:10:47 +0200
Subject: [PATCH] [core/input] Ignore errors during callbacks

If a callback command cannot be executed, do not terminate the whole
bar. Furthermore, if such a failure occurs, try to fall back to a
globally (i.e. non widget-specific) command, so that callbacks
registered in the engine itself (such as mouse-wheel scrolling) still
function properly.

fixes #166
---
 bumblebee/input.py | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/bumblebee/input.py b/bumblebee/input.py
index 1678b2e..cac471d 100644
--- a/bumblebee/input.py
+++ b/bumblebee/input.py
@@ -126,9 +126,14 @@ class I3BarInput(object):
 
         if cmd is None:
             return
-        if callable(cmd):
-            cmd(event)
-        else:
-            bumblebee.util.execute(cmd, False)
+        try:
+            if callable(cmd):
+                cmd(event)
+            else:
+                bumblebee.util.execute(cmd, False)
+        except Exception:
+            # fall back to global default
+            if not "__fallback" in event:
+                return self.callback({ "name": None, "instance": None, "__fallback": True, "button": event["button"] })
 
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