Enable Metadata's default option, using user definable functions

apps/documents/conf/settings.py

@@ -0,0 +1,9 @@
+import datetime
+
+from django.conf import settings
+
+default_available_functions = {
+    'current_date':datetime.datetime.now().date,
+}
+
+AVAILABLE_FUNCTIONS = getattr(settings, 'DOCUMENTS_METADATA_AVAILABLE_FUNCTIONS', default_available_functions)

apps/documents/forms.py

@@ -10,6 +10,8 @@ from common.utils import urlquote
 from models import Document, DocumentType, DocumentTypeMetadataType
 
 
+from documents.conf.settings import AVAILABLE_FUNCTIONS
+
 class DocumentForm(forms.ModelForm):
     class Meta:
         model = Document
@@ -29,8 +31,14 @@ class MetadataForm(forms.Form):
             required=False, widget=forms.TextInput(attrs={'readonly':'readonly'}))
         self.fields['value'] = forms.CharField(label=_(u'Value'))
         if hasattr(self, 'metadata_type'):
-             self.fields['name'].initial=self.metadata_type.name
-             self.fields['id'].initial=self.metadata_type.id
+            self.fields['name'].initial=self.metadata_type.name
+            self.fields['id'].initial=self.metadata_type.id
+            if self.metadata_type.default:
+                try:
+                    self.fields['value'].initial = eval(self.metadata_type.default, AVAILABLE_FUNCTIONS)
+                except Exception, err:
+                    self.fields['value'].initial = err
+            
 
 
 class DocumentCreateWizard(BoundFormWizard):

apps/documents/models.py

@@ -6,6 +6,8 @@ from datetime import datetime
 from django.db import models
 from django.utils.translation import ugettext_lazy as _
 
+from documents.conf.settings import AVAILABLE_FUNCTIONS
+
 
 def get_filename_from_uuid(instance, filename, directory='documents'):
     populate_file_extension_and_mimetype(instance, filename)
@@ -46,9 +48,12 @@ class Document(models.Model):
         return self.uuid
 
 
+available_functions_string = (_(u' Available functions: %s') % ','.join(['%s()' % name for name, function in AVAILABLE_FUNCTIONS.items()])) if AVAILABLE_FUNCTIONS else ''
+
 class MetadataType(models.Model):
     name = models.CharField(max_length=32, verbose_name=_(u'name'))
-    default = models.CharField(max_length=64, blank=True, null=True, verbose_name=_(u'default'))
+    default = models.CharField(max_length=64, blank=True, null=True,
+        verbose_name=_(u'default'), help_text=_(u'Enter a string to be evaluated.%s') % available_functions_string)
     lookup = models.CharField(max_length=64, blank=True, null=True, verbose_name=_(u'lookup'))
     #datatype = models.