From db4868207c48882931659c11576000b6124f8235 Mon Sep 17 00:00:00 2001
From: Stein Magnus Jodal <stein.magnus@jodal.no>
Date: Mon, 8 Sep 2014 21:15:14 +0200
Subject: [PATCH] Print friendly error message if gobject isn't found

Fixes #836
---
 docs/changelog.rst |  5 +++++
 mopidy/__main__.py | 18 ++++++++++++++++--
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/docs/changelog.rst b/docs/changelog.rst
index 7a15fb5a..0ff362f8 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -8,6 +8,11 @@ This changelog is used to track all major changes to Mopidy.
 v0.20.0 (UNRELEASED)
 ====================
 
+**Commands**
+
+- Make the ``mopidy`` command print a friendly error message if the
+  :mod:`gobject` Python module cannot be imported. (Fixes: :issue:`836`)
+
 **Local backend**
 
 - Add cover URL to all scanned files with MusicBrainz album IDs. (Fixes:
diff --git a/mopidy/__main__.py b/mopidy/__main__.py
index 9620b936..aa8d6dd9 100644
--- a/mopidy/__main__.py
+++ b/mopidy/__main__.py
@@ -4,9 +4,23 @@ import logging
 import os
 import signal
 import sys
+import textwrap
 
-import gobject
-gobject.threads_init()
+try:
+    import gobject
+    gobject.threads_init()
+except ImportError:
+    print(textwrap.dedent("""
+        ERROR: The gobject Python package was not found.
+
+        Mopidy requires GStreamer (and GObject) to work. These are C libraries
+        with a number of dependencies themselves, and cannot be installed with
+        the regular Python tools like pip.
+
+        Please see http://docs.mopidy.com/en/latest/installation/ for
+        instructions on how to install the required dependencies.
+    """))
+    raise
 
 try:
     # Make GObject's mainloop the event loop for python-dbus