Convert the title calculation into a template tag

Convert the calculate form title template into a template tag.
The result of the template tag is applied as the title property
of the <H3> HTML tag allowing users to view the full title on
mouse hover if the title was truncated.

Signed-off-by: Roberto Rosario <Roberto.Rosario@mayan-edms.com>

HISTORY.rst

@@ -195,6 +195,10 @@
 - Moved the navigation templates from the appearance app to the
   navigation app.
 - Moved the dashboard and dashboard widgets to their own app.
+- Converted the calculate form title template into a template tag.
+  The result of the template tag is applied as the title property
+  of the H3 HTML tag allowing users to view the full title on 
+  mouse hover if it was truncated.
 
 3.1.9 (2018-11-01)
 ==================

mayan/apps/appearance/settings.py

@@ -7,6 +7,7 @@ from mayan.apps.smart_settings import Namespace
 from .literals import DEFAULT_MAXIMUM_TITLE_LENGTH
 
 namespace = Namespace(name='appearance', label=_('Appearance'))
+
 setting_max_title_length = namespace.add_setting(
     default=DEFAULT_MAXIMUM_TITLE_LENGTH,
     global_name='APPEARANCE_MAXIMUM_TITLE_LENGTH', help_text=_(

mayan/apps/appearance/templates/appearance/calculate_form_title.html

@@ -1,42 +1,15 @@
 {% load i18n %}
 
-{% load smart_settings_tags %}
+{% load common_tags %}
 
-{% smart_setting 'APPEARANCE_MAXIMUM_TITLE_LENGTH' as maximum_title_length %}
+{% common_calculate_title as form_title %}
 
 {% if not non_html_title %}
-    <h3>
+    <h3 title='{{ form_title }}'>
 {% endif %}
-
-    {% if title %}
-        {{ title|truncatechars:maximum_title_length }}
-    {% else %}
-        {% if delete_view %}
-            {% trans 'Confirm delete' %}
-        {% else %}
-            {% if form %}
-                {% if object %}
-                    {% blocktrans with object as object %}Edit: {{ object }}{% endblocktrans %}
-                {% else %}
-                    {% trans 'Confirm' %}
-                {% endif %}
-            {% else %}
-                {% if read_only %}
-                    {% blocktrans %}Details for: {{ object }}{% endblocktrans %}
-                {% else %}
-                    {% if object %}
-                        {% blocktrans with object as object %}Edit: {{ object }}{% endblocktrans %}
-                    {% else %}
-                        {% trans 'Create' %}
-                    {% endif %}
-                {% endif %}
-            {% endif %}
-        {% endif %}
-    {% endif %}
-
+    {{ form_title }}
 {% if not non_html_title %}
     </h3>
-
     {% if subtitle %}
         <small>{{ subtitle }}</small>
     {% endif %}

mayan/apps/common/classes.py

@@ -4,7 +4,6 @@ import hashlib
 
 from django.apps import apps
 from django.db import models
-from django.template import loader
 from django.template.response import TemplateResponse
 from django.urls import reverse
 from django.utils.encoding import force_text, python_2_unicode_compatible

mayan/apps/common/templatetags/common_tags.py

@@ -3,10 +3,13 @@ from __future__ import unicode_literals
 from json import dumps
 
 from django.template import Context, Library
+from django.template.defaultfilters import truncatechars
 from django.template.loader import get_template
 from django.utils.encoding import force_text
+from django.utils.translation import ugettext_lazy as _
 
 import mayan
+from mayan.apps.appearance.settings import setting_max_title_length
 
 from ..classes import Collection
 from ..literals import MESSAGE_SQLITE_WARNING
@@ -58,3 +61,28 @@ def render_subtemplate(context, template_name, template_context):
     new_context = Context(context.flatten())
     new_context.update(Context(template_context))
     return get_template(template_name).render(new_context.flatten())
+
+
+@register.simple_tag(takes_context=True)
+def common_calculate_title(context):
+    if context.get('title'):
+        return truncatechars(
+            value=context.get('title'), arg=setting_max_title_length.value
+        )
+    else:
+        if context.get('delete_view'):
+            return _('Confirm delete')
+        else:
+            if context.get('form'):
+                if context.get('object'):
+                    return _('Edit %s') % context.get('object')
+                else:
+                    return _('Confirm')
+            else:
+                if context.get('read_only'):
+                    return _('Details for: %s') % context.get('object')
+                else:
+                    if context.get('object'):
+                        return _('Edit: %s') % context.get('object')
+                    else:
+                        return _('Create')