feat(linux): support additional browser binaries (Chromium) instead o…

…f only `google-chrome-stable`, close #7; add nicer error message if no browser binaries found

multibrowse.py

@@ -49,4 +49,7 @@
             print('Error: No display number {}'.format(index + 1), file=sys.stderr)
             continue
         print('Opening {} on monitor {}'.format(url, index + 1))
-        platform.open_browser(url, display, flags)
+        try:
+            platform.open_browser(url, display, flags)
+        except FileNotFoundError as e:
+            print("Error: {}".format(e))

systems/linux.py

@@ -1,16 +1,26 @@
 from functools import lru_cache
 import re
-from subprocess import call, check_output, DEVNULL
+from subprocess import call, check_output, DEVNULL, CalledProcessError
 
 from . import BaseSystem
 
+BINARIES = [
+    'chromium-browser',     # ubuntu/debian
+    'chromium',             # arch
+    'google-chrome-stable', # arch
+]
 
 class System(BaseSystem):
 
     @property
     @lru_cache()
     def browser_path(self):
-        return check_output(['which', 'google-chrome-stable'])[:-1].decode('utf8')
+        for binary in BINARIES:
+            try:
+                return check_output(['which', binary], stderr=DEVNULL)[:-1].decode('utf8')
+            except CalledProcessError:
+                pass
+        raise FileNotFoundError("No supported browsers found!")
 
     def close_existing_browsers(self):
         return call(['killall', '-9', 'chrome'], stdout=DEVNULL, stderr=DEVNULL)