Add support for substitution variables to workflows.

- This allows variables to be used in exported models (#465)
- This allows access to the previous status in emails (#447)
- This allows a workflow field to reference a form field (#248)
- This allows a workflow field to reference a user field (#249)

wcs/workflows.py

@@ -288,6 +288,17 @@ class WorkflowStatusItem:
             if widget:
                 setattr(self, f, widget.parse())
 
+    def compute(self, var):
+        if not isinstance(var, basestring):
+            return var
+        if not var.startswith('='):
+            return var
+        vars = get_publisher().substitutions.get_context_variables()
+        try:
+            return eval(var[1:], vars)
+        except:
+            return var
+
     def __getstate__(self):
         odict = self.__dict__.copy()
         if odict.has_key('parent'):
@@ -501,13 +512,13 @@ class SendmailWorkflowStatusItem(WorkflowStatusItem):
 
         url = formdata.get_url()
         try:
-            mail_body = template_on_formdata(formdata, self.body)
+            mail_body = template_on_formdata(formdata, self.compute(self.body))
         except ezt.EZTException:
             get_logger().error('error in template for email body [%s], mail could not be generated' % url)
             return
 
         try:
-            mail_subject = template_on_formdata(formdata, self.subject)
+            mail_subject = template_on_formdata(formdata, self.compute(self.subject))
         except ezt.EZTException:
             get_logger().error('error in template for email subject [%s], mail could not be generated' % url)
             return
@@ -522,6 +533,8 @@ class SendmailWorkflowStatusItem(WorkflowStatusItem):
 
         addresses = []
         for dest in self.to:
+            dest = self.compute(dest)
+
             if '@' in str(dest):
                 addresses.append(dest)
                 continue
@@ -575,6 +588,7 @@ register_item_class(SendmailWorkflowStatusItem)
 
 def template_on_formdata(formdata, template, process=None):
     dict = {}
+    dict.update(get_publisher().substitutions.get_context_variables())
     dict['url'] = formdata.get_url()
     dict['url_status'] = '%sstatus' % formdata.get_url()
     dict['details'] = formdata.formdef.get_detailed_email_form(formdata, dict['url'])
@@ -630,7 +644,7 @@ class SendSMSWorkflowStatusItem(WorkflowStatusItem):
             return
 
         try:
-            sms_body = template_on_formdata(formdata, self.body)
+            sms_body = template_on_formdata(formdata, self.compute(self.body))
         except ezt.EZTException:
             url = formdata.get_url()
             get_logger().error('error in template for sms [%s], sms could not be generated' % url)
@@ -641,7 +655,7 @@ class SendSMSWorkflowStatusItem(WorkflowStatusItem):
         sms_cfg = get_cfg('sms', {})
         sender = sms_cfg.get('sender', 'AuQuotidien')[:11]
         try:
-            SMS().send(self.to, sms_body[:160], sender)
+            SMS().send([self.compute(x) for x in self.to], sms_body[:160], sender)
         except errors.SMSError, e:
             get_logger().error(e)
 
@@ -661,6 +675,7 @@ class DisplayMessageWorkflowStatusItem(WorkflowStatusItem):
         tmpl.parse(self.message)
 
         dict = {}
+        dict.update(get_publisher().substitutions.get_context_variables())
         dict['date'] = misc.localstrftime(filled.receipt_time)
         dict['number'] = filled.id
         if filled.formdef.receiver and filled.formdef.receiver.details: