fixed terminal encoding bug with exec

--HG--
branch : pmacs2

method/shell.py

@@ -30,6 +30,11 @@ class Exec(Method):
         result  = p.wait()
         status  = os.WEXITSTATUS(result)
 
+        try:
+            output2 = output.decode('utf-8')
+        except:
+            output2 = output.decode('latin-1')
+
         if not os.WIFEXITED(result) or status != 0:
             err = True
             msg = "failed to exec %r" % cmdname
@@ -37,9 +42,9 @@ class Exec(Method):
             err = False
             msg = "exec(%r): ok" % (cmdname,)
 
-        if output:
+        if output2:
             switch_to = err or self.show_success
-            w.application.data_buffer(bufname, output, switch_to=switch_to)
+            w.application.data_buffer(bufname, output2, switch_to=switch_to)
         w.set_error(msg)
         
     def _execute(self, w, **vargs):