Implement displaying of whiteboard messages

Issue #159
Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/html/index.html

@@ -16,9 +16,7 @@
 </p>
 {% endif %}
 
-{% for msg in whiteboard_messages %}
-{% show_message 'info whiteboard' msg.message %}
-{% endfor %}
+{% whiteboard_messages %}
 
 <ul class="nav nav-pills">
 {% if user.is_authenticated %}

weblate/html/language.html

@@ -9,6 +9,8 @@
 
 {% block content %}
 
+{% whiteboard_messages language=object %}
+
 <ul class="nav nav-pills">
   <li class="active"><a href="#overview" data-toggle="tab">{% trans "Overview" %}</a></li>
   <li><a href="#history" data-toggle="tab">{% trans "History" %}</a></li>

weblate/html/project.html

@@ -14,6 +14,8 @@
 
 {% block content %}
 
+{% whiteboard_messages project=object %}
+
 {% can_see_repository_status user object as user_can_see_repository_status %}
 {% can_commit_translation user object as user_can_commit_translation %}
 {% can_manage_acl user object as user_can_manage_acl %}

weblate/html/subproject.html

 {% extends "base.html" %}
 {% load i18n %}
 {% load permissions %}
+{% load translations %}
 {% load crispy_forms_tags %}
 
 {% block breadcrumbs %}
@@ -13,6 +14,9 @@
 {% endblock %}
 
 {% block content %}
+
+{% whiteboard_messages subproject=object %}
+
 {% can_see_repository_status user object.project as user_can_see_repository_status %}
 {% can_commit_translation user object.project as user_can_commit_translation %}
 {% can_manage_acl user object.project as user_can_manage_acl %}

weblate/html/translation.html

@@ -14,6 +14,9 @@
 {% endblock %}
 
 {% block content %}
+
+{% whiteboard_messages subproject=object.subproject language=object.language %}
+
 {% can_see_repository_status user object.subproject.project as user_can_see_repository_status %}
 {% can_commit_translation user object.subproject.project as user_can_commit_translation %}
 

weblate/trans/models/whiteboard.py

@@ -21,11 +21,45 @@
 """Whiteboard model."""
 
 from django.db import models
+from django.db.models import Q
 from django.utils.translation import ugettext_lazy, ugettext as _
 from django.core.exceptions import ValidationError
 from weblate.lang.models import Language
 
 
+class WhiteboardManager(models.Manager):
+    def context_filter(self, project=None, subproject=None, language=None):
+        """Filters whiteboard messages by context."""
+        base = self.all()
+
+        if language is None and project is None and subproject is None:
+            return base.filter(
+                project=None, subproject=None, language=None
+            )
+
+        if language and project is None and subproject is None:
+            return base.filter(
+                project=None, subproject=None, language=language
+            )
+
+        if project:
+            return base.filter(project=project)
+
+        if subproject:
+            if language:
+                return base.filter(
+                    Q(language=language) |
+                    Q(subproject=subproject) |
+                    Q(project=subproject.project)
+                )
+
+            return base.filter(
+                Q(subproject=subproject) | Q(project=subproject.project)
+            )
+
+        return base
+
+
 class WhiteboardMessage(models.Model):
     message = models.TextField(
         verbose_name=ugettext_lazy('Message'),
@@ -35,6 +69,8 @@ class WhiteboardMessage(models.Model):
     subproject = models.ForeignKey('SubProject', null=True, blank=True)
     language = models.ForeignKey(Language, null=True, blank=True)
 
+    objects = WhiteboardManager()
+
     class Meta(object):
         app_label = 'trans'
         verbose_name = ugettext_lazy('Whiteboard message')

weblate/trans/templatetags/translations.py

@@ -20,6 +20,7 @@
 
 from django.utils.html import escape
 from django.contrib.admin.templatetags.admin_static import static
+from django.template.loader import render_to_string
 from django.utils.safestring import mark_safe
 from django.utils.encoding import force_unicode
 from django.utils.translation import ugettext as _, ungettext, ugettext_lazy
@@ -36,7 +37,9 @@ import weblate
 from weblate.trans.simplediff import html_diff
 from weblate.trans.util import split_plural
 from weblate.lang.models import Language
-from weblate.trans.models import Project, SubProject, Dictionary, Advertisement
+from weblate.trans.models import (
+    Project, SubProject, Dictionary, Advertisement, WhiteboardMessage
+)
 from weblate.trans.checks import CHECKS
 
 register = template.Library()
@@ -544,3 +547,26 @@ def get_location_links(unit):
         else:
             ret.append('<a href="%s">%s</a>' % (link, location))
     return mark_safe('\n'.join(ret))
+
+
+@register.simple_tag
+def whiteboard_messages(project=None, subproject=None, language=None):
+    """Displays whiteboard messages for given context"""
+    ret = []
+
+    whiteboards = WhiteboardMessage.objects.context_filter(
+        project, subproject, language
+    )
+
+    for whiteboard in whiteboards:
+        ret.append(
+            render_to_string(
+                'message.html',
+                {
+                    'tags': 'info whiteboard',
+                    'message': whiteboard.message
+                }
+            )
+        )
+
+    return mark_safe('\n'.join(ret))