added syntax checker management command

dbtemplates/admin.py

@@ -119,16 +119,16 @@ class TemplateAdmin(TemplateModelAdmin):
     def validate_syntax(self, request, queryset):
         errors = []
         for template in queryset:
-            ok = check_template_syntax(template)
-            if not ok:
-                errors.append(template.name)
+            result = check_template_syntax(template)
+            if not result[0]:
+                errors.append('%s: %s' % (template.name, result[1]))
         if errors:
             message = ungettext(
                 "Template syntax check FAILED for %(names)s.",
                 "Template syntax check FAILED for %(count)d templates: %(names)s.",
                 len(errors))
             self.message_user(request, message % {'count': len(errors),
-                'names': ', '.join(errors)})
+                'names': '; '.join(errors)})
         else:
             message = ungettext(
                 "Template syntax OK.",

dbtemplates/management/commands/check_template_syntax.py

@@ -0,0 +1,20 @@
+from django.core.management.base import CommandError, NoArgsCommand
+
+from dbtemplates.models import Template
+from dbtemplates.utils.template import check_template_syntax as check
+
+class Command(NoArgsCommand):
+    help = "Ensures templates don't have syntax errors."
+
+    def handle_noargs(self, **options):
+        errors = []
+        for template in Template.objects.all():
+            result = check(template)
+            if not result[0]:
+                errors.append('%s: %s' % (template.name, result[1]))
+        if errors:
+            raise CommandError(
+                'Some templates contained errors\n%s' % '\n'.join(errors))
+        # NOTE: printing instead of using self.stdout.write to maintain 
+        # Django 1.2 compatibility
+        print('OK')

dbtemplates/utils/template.py

@@ -52,7 +52,7 @@ def get_template_source(name):
 def check_template_syntax(template):
     try:
         t =  Template(template.content)
-    except TemplateSyntaxError:
-        return False
-    return True
+    except TemplateSyntaxError, e:
+        return (False, e)
+    return (True, None)