Add new TimeFieldRenderer, make it default for Time fields

Uses a jQuery UI widget similar to datepicker:

https://fgelinas.com/code/timepicker/

tailbone/forms/renderers/__init__.py

@@ -30,7 +30,7 @@ from .core import CustomFieldRenderer, DateFieldRenderer
 
 from .common import (AutocompleteFieldRenderer,
                      DecimalFieldRenderer, CurrencyFieldRenderer,
-                     DateTimeFieldRenderer, DateTimePrettyFieldRenderer,
+                     DateTimeFieldRenderer, DateTimePrettyFieldRenderer, TimeFieldRenderer,
                      EnumFieldRenderer, YesNoFieldRenderer)
 
 from .people import (PersonFieldRenderer, PersonFieldLinkRenderer,

tailbone/forms/renderers/common.py

@@ -26,7 +26,14 @@ Common Field Renderers
 
 from __future__ import unicode_literals, absolute_import
 
+import datetime
+
+import pytz
+
+from rattail.time import localtime
+
 import formalchemy
+from formalchemy import helpers
 from formalchemy.fields import FieldRenderer, SelectFieldRenderer, CheckBoxFieldRenderer
 from pyramid.renderers import render
 
@@ -102,6 +109,51 @@ class DateTimePrettyFieldRenderer(formalchemy.DateTimeFieldRenderer):
         return pretty_datetime(self.request.rattail_config, value)
 
 
+class TimeFieldRenderer(formalchemy.TimeFieldRenderer):
+    """
+    Custom renderer for time fields.  In edit mode, renders a simple text
+    input, which is expected to become a 'timepicker' widget in the UI.
+    However the particular magic required for that lives in 'tailbone.js'.
+    """
+    format = '%I:%M %p'
+
+    def render(self, **kwargs):
+        kwargs.setdefault('class_', 'timepicker')
+        return helpers.text_field(self.name, value=self.value, **kwargs)
+
+    def render_readonly(self, **kwargs):
+        return self.render_value(self.raw_value)
+
+    def render_value(self, value):
+        value = self.convert_value(value)
+        if isinstance(value, datetime.time):
+            return value.strftime(self.format)
+        return ''
+
+    def convert_value(self, value):
+        if isinstance(value, datetime.datetime):
+            if not value.tzinfo:
+                value = pytz.utc.localize(value)
+            return localtime(self.request.rattail_config, value).time()
+        return value
+
+    def stringify_value(self, value, as_html=False):
+        if not as_html:
+            return self.render_value(value)
+        return super(TimeFieldRenderer, self).stringify_value(value, as_html=as_html)
+
+    def _serialized_value(self):
+        return self.params.getone(self.name)
+
+    def deserialize(self):
+        value = self._serialized_value()
+        if value:
+            try:
+                return datetime.datetime.strptime(value, self.format).time()
+            except ValueError:
+                pass
+
+
 class EnumFieldRenderer(SelectFieldRenderer):
     """
     Renderer for simple enumeration fields.