slightly improve tab support (as well as adding an *Exception* buffer for app exception)

--HG--
branch : pmacs2

application.py

@@ -319,6 +319,7 @@ class Application(object):
         data = '\n'.join(lines)
 
         b = self.data_buffer("*Completions*", data, switch_to=False)
+
         b._completion = s
         b._opened     = opened
         b._previous   = previous

method/__init__.py

@@ -490,6 +490,11 @@ class InsertTab(Method):
 
         # if no lvl, insert a literal tab
         if lvl is None:
+            #w.insert_string_at_cursor(' ' * w.mode.tabwidth)
+            if w.buffer.usetabs:
+                # see HACK in buffer
+                w.insert_string_at_cursor('\t  \t')
+            else:
                 w.insert_string_at_cursor(' ' * w.mode.tabwidth)
             return
 
@@ -497,7 +502,13 @@ class InsertTab(Method):
         ws = w.buffer.count_leading_whitespace(y)
         if lvl != ws:
             w.delete(Point(0, y), Point(ws, y))
-            w.insert_string(Point(0, y), ' ' * lvl)
+            if w.buffer.usetabs:
+                nt = lvl // w.mode.tabwidth
+                ns = lvl % w.mode.tabwidth
+                s = ('\t  \t' * nt) + (' ' * ns)
+            else:
+                s = ' ' * lvl
+            w.insert_string(Point(0, y), s)
         x2 = max(x, lvl)
         if w.logical_cursor().x < x2:
             w.goto(Point(x2, y))

mode/__init__.py

@@ -1,5 +1,9 @@
+import math
+import os
+import string
+import sys
+import traceback
 from util import defaultdict
-import math, os, string
 import color, method
 from lex import Lexer
 from point import Point
@@ -458,7 +462,10 @@ class Fundamental(Handler):
         except Exception, e:
             if DEBUG:
                 raise
-            else:
+            exc_type, exc_value, exc_traceback = sys.exc_info()
+            data = ''.join(traceback.format_tb(exc_traceback))
+            self.window.application.data_buffer("*Exception*", data,
+                                                switch_to=False)
             self.window.set_error(str(e))
 
     def region_added(self, p, newlines):

mode/c.py

@@ -20,6 +20,7 @@ class ErrorGrammar(Grammar):
 chr1   = '[a-zA-Z_]'
 chr2   = '[a-zA-Z0-9_]'
 word   = chr1 + chr2 + '*'
+spaces = r'[\t ]+'
 
 class MacroGrammar(Grammar):
     rules = [
@@ -36,7 +37,7 @@ class MacroGrammar(Grammar):
 
 class CGrammar(Grammar):
     rules = [
-        PatternRule('spaces', r' +'),
+        PatternRule('spaces', spaces),
 
         PatternMatchRule('x', r'(\()( *)(' + word + r')(\**)( *)(\))( *)(?=[a-zA-Z0-9_\(])',
                          'delimiter', 'spaces', 'c.type', 'c.operator',