Carry descriptive info in the input form so that, when a transaction

is undone, the application can note the fact in the undoing
transaction. This is extremely desireable when doing transactional
undo, so that you can keep track of what the undoing transactions
actually (un)did.

lib/python/App/Undo.py

@@ -84,13 +84,14 @@
 ##############################################################################
 __doc__='''short description
 
-$Id: Undo.py,v 1.24 2001/01/11 22:42:42 chrism Exp $'''
-__version__='$Revision: 1.24 $'[11:-2]
+$Id: Undo.py,v 1.25 2001/04/12 18:49:02 jim Exp $'''
+__version__='$Revision: 1.25 $'[11:-2]
 
 import Globals, ExtensionClass
 from DateTime import DateTime
 from string import atof, find, atoi, split, rfind, join
 from AccessControl import getSecurityManager
+import base64
 
 class UndoSupport(ExtensionClass.Base):
 
@@ -164,7 +165,21 @@ class UndoSupport(ExtensionClass.Base):
         r=Globals.UndoManager.undoInfo(
             first_transaction, last_transaction, spec)
 
-        for d in r: d['time']=DateTime(d['time'])
+        encode = base64.encodestring
+        for d in r:
+            d['time']=t=DateTime(d['time'])
+            desc = d['description']
+            tid=d['id']
+            if desc:
+                desc = split(desc)
+                d1=desc[0]
+                desc = join(desc[1:])
+                if len(desc) > 60: desc = desc[:56]+' ...'
+                tid = "%s %s %s %s" % (encode64(tid), t, d1, desc)
+            else:
+                tid = "%s %s" % (encode64(tid), t)
+            d['id']=tid
+
 
         return r
     
@@ -172,8 +187,12 @@ class UndoSupport(ExtensionClass.Base):
         """
         """
         undo=Globals.UndoManager.undo
-        for i in transaction_info: undo(i)
-            
+        for tid in transaction_info:
+            tid=split(tid)
+            if tid:
+                get_transaction().note("Undo %s" % join(tid[1:]))
+                tid=decode64(tid[0])
+                undo(tid)
             
         if REQUEST is None: return
         REQUEST['RESPONSE'].redirect("%s/manage_UndoForm" % REQUEST['URL1'])
@@ -195,3 +214,21 @@ class Prefix:
         return rval
             
 
+
+########################################################################
+# Blech, need this cause binascii.b2a_base64 is too pickly
+
+import binascii
+
+def encode64(s, b2a=binascii.b2a_base64):
+    if len(s) < 58: return b2a(s)
+    r=[]; a=r.append
+    for i in range(0, len(s), 57):
+        a(b2a(s[i:i+57])[:-1])
+    return join(r,'')
+
+def decode64(s, a2b=binascii.a2b_base64):
+    __traceback_info__=len(s), `s`
+    return a2b(s+'\n')
+
+del binascii