Show last merge failure on repository status

This gives user better overview what is current state (rather than just
showing there are changes to merge in both directions).

Fixes WeblateOrg#554

Signed-off-by: Michal Čihař <michal@cihar.com>

docs/changes.rst

@@ -15,6 +15,7 @@ Released on ? 2015.
 * Simplified workflow for accepting suggestions.
 * Added project owners who always receive important notifications.
 * Allow to disable editing of monolingual template.
+* More detailed repository status view.
 
 weblate 2.2
 -----------

weblate/html/js/git-status.html

@@ -9,16 +9,24 @@
 <div class="panel-heading"><h4 class="panel-title">{% trans "Repository status" %}</h4></div>
 <div class="panel-body">
 {% if needs_commit %}
-<p>{% trans "There are some not committed changes!" %}</p>
+<div class="alert alert-info" role="alert">{% trans "There are some not committed changes!" %}</div>
 {% endif %}
+{% if changes.0.is_merge_failure %}
+<div class="alert alert-danger" role="alert">
+<p>{% trans "There has been a merge failure on the repository:" %}</p>
+<pre>{{ changes.0.target }}</pre>
+<p><a href="{% documentation "faq" "merge" %}">{% trans "Check our FAQ for information how to resolve this." %}</a></p>
+</div>
+{% else %}
 {% if object.git_needs_merge %}
-<p>{% trans "The remote repository needs to be merged!" %}</p>
+<div class="alert alert-warning" role="alert">{% trans "The remote repository needs to be merged!" %}</div>
 {% endif %}
 {% if object.git_needs_push %}
-<p>{% trans "There are some new commits in the local repository!" %}</p>
+<div class="alert alert-warning" role="alert">{% trans "There are some new commits in the local repository!" %}</div>
 {% endif %}
 {% if not needs_commit and not object.git_needs_merge and not object.git_needs_push %}
-<p>{% trans "The local repository is up to date." %}</p>
+<div class="alert alert-success" role="alert">{% trans "The local repository is up to date." %}</div>
+{% endif %}
 {% endif %}
 
 {% if object.subproject_set %}

weblate/trans/models/changes.py

@@ -216,6 +216,11 @@ class Change(models.Model):
         ACTION_FAILED_REBASE,
     ))
 
+    ACTIONS_MERGE_FAILURE = set((
+        ACTION_FAILED_MERGE,
+        ACTION_FAILED_REBASE,
+    ))
+
     unit = models.ForeignKey('Unit', null=True)
     subproject = models.ForeignKey('SubProject', null=True)
     translation = models.ForeignKey('Translation', null=True)
@@ -243,6 +248,9 @@ def __unicode__(self):
             'user': self.get_user_display(False),
         }
 
+    def is_merge_failure(self):
+        return self.action in self.ACTIONS_MERGE_FAILURE
+
     def get_user_display(self, icon=True):
         return get_user_display(self.user, icon, link=True)