Better error handling

files/.i3/py3status/microphone.py

@@ -19,45 +19,65 @@ Colors:
 import subprocess
 
 
+class NoMicrophone(Exception):
+    pass
+
+
+class Error(Exception):
+    pass
+
+
 class Py3status:
     format_muted = '\uf131'  # FontAwesome
     format_unmuted = '\uf130'  # FontAwesome
 
-    class Error(Exception):
-        pass
-
     def microphone(self):
-        isMute = self.__getMuteStatus__()
-        color = self.py3.COLOR_MUTE if isMute else self.py3.COLOR_UNMUTE
-        text = self.format_muted if isMute else self.format_unmuted
-        return {
-            'full_text': text,
-            'color': color,
-        }
+        try:
+            isMute = self.__getMuteStatus__()
+            color = self.py3.COLOR_MUTE if isMute else self.py3.COLOR_UNMUTE
+            text = self.format_muted if isMute else self.format_unmuted
+            return {
+                'full_text': text,
+                'color': color,
+            }
+        except NoMicrophone:
+            return {
+                'full_text': '',
+            }
+        except Error:
+            return {
+                'full_text': '...',
+            }
 
     def __getPaList__(self):
         try:
             paOutput = subprocess.check_output(["pacmd", "list-sources"])
-        except CalledProcessError:
+        except subprocess.CalledProcessError:
             raise Error()
 
         return paOutput.decode()
 
     def __getMuteStatus__(self):
-        paList = self.__getPaList__()
-        fromCurrent = paList[paList.find('* index:'):]
-        MUTED_STR = 'muted: '
-        fromMutestat = fromCurrent[fromCurrent.find(MUTED_STR)
-                                   + len(MUTED_STR):]
-        return fromMutestat[:3] == 'yes'
+        try:
+            paList = self.__getPaList__()
+            fromCurrent = paList[paList.index('* index:'):]
+            MUTED_STR = 'muted: '
+            fromMutestat = fromCurrent[fromCurrent.index(MUTED_STR)
+                                       + len(MUTED_STR):]
+            return fromMutestat[:3] == 'yes'
+        except ValueError:
+            raise NoMicrophone()
 
     def __toggleMuteStatus__(self):
-        isMuted = self.__getMuteStatus__()
-        paList = self.__getPaList__()
-        fromCurrent = paList[paList.find('* index: ')+len('* index: '):]
-        sourceId = int(fromCurrent[:fromCurrent.find('\n')])
-        subprocess.call(['pacmd', 'set-source-mute', str(sourceId),
-                         str(int(not isMuted))])
+        try:
+            isMuted = self.__getMuteStatus__()
+            paList = self.__getPaList__()
+            fromCurrent = paList[paList.index('* index: ')+len('* index: '):]
+            sourceId = int(fromCurrent[:fromCurrent.index('\n')])
+            subprocess.call(['pacmd', 'set-source-mute', str(sourceId),
+                             str(int(not isMuted))])
+        except ValueError:
+            raise NoMicrophone()
 
     def on_click(self, event):
         self.__toggleMuteStatus__()