Redirect the warning stream to the shell during the ScriptBinding check of user code

and format the warning similarly to an exception for both that check and for
warnings raised in the subprocess.

M NEWS.txt
M Pyshell.py
M ScriptBinding.py
M run.py

Lib/idlelib/NEWS.txt

@@ -3,6 +3,10 @@ What's New in IDLE 1.1a0?
 
 *Release date: XX-XXX-2004*
 
+- Redirect the warning stream to the shell during the ScriptBinding check of
+  user code and format the warning similarly to an exception for both that
+  check and for runtime warnings raised in the subprocess.
+
 - CodeContext hint pane visibility state is now persistent across sessions.
   The pane no longer appears in the shell window.  Added capability to limit
   extensions to shell window or editor windows.  Noam Raphael addition

Lib/idlelib/PyShell.py

@@ -44,16 +44,34 @@ try:
 except ImportError:
     SIGTERM = 15
 
-# Change warnings module to write to sys.__stderr__
+# Override warnings module to write to warning_stream.  Initialize to send IDLE
+# internal warnings to the console.  ScriptBinding.check_syntax() will
+# temporarily redirect the stream to the shell window to display warnings when
+# checking user's code.
+global warning_stream
+warning_stream = sys.__stderr__
 try:
     import warnings
 except ImportError:
     pass
 else:
     def idle_showwarning(message, category, filename, lineno):
-        file = sys.__stderr__
+        file = warning_stream
+        try:
             file.write(warnings.formatwarning(message, category, filename, lineno))
+        except IOError:
+            pass  ## file (probably __stderr__) is invalid, warning dropped.
     warnings.showwarning = idle_showwarning
+    def idle_formatwarning(message, category, filename, lineno):
+        """Format warnings the IDLE way"""
+        s = "\nWarning (from warnings module):\n"
+        s += '  File \"%s\", line %s\n' % (filename, lineno)
+        line = linecache.getline(filename, lineno).strip()
+        if line:
+            s += "    %s\n" % line
+        s += "%s: %s\n>>> " % (category.__name__, message)
+        return s
+    warnings.formatwarning = idle_formatwarning
 
 def extended_linecache_checkcache(orig_checkcache=linecache.checkcache):
     """Extend linecache.checkcache to preserve the <pyshell#...> entries
@@ -815,6 +833,13 @@ class PyShell(OutputWindow):
     endoffile = False
     closing = False
 
+    def set_warning_stream(self, stream):
+	global warning_stream
+	warning_stream = stream
+
+    def get_warning_stream(self):
+        return warning_stream
+
     def toggle_debugger(self, event=None):
         if self.executing:
             tkMessageBox.showerror("Don't debug now",

Lib/idlelib/ScriptBinding.py

@@ -82,6 +82,9 @@ class ScriptBinding:
         return True
 
     def checksyntax(self, filename):
+        self.shell = shell = self.flist.open_shell()
+        saved_stream = shell.get_warning_stream()
+        shell.set_warning_stream(shell.stderr)
         f = open(filename, 'r')
         source = f.read()
         f.close()
@@ -91,6 +94,7 @@ class ScriptBinding:
             source = source + '\n'
         text = self.editwin.text
         text.tag_remove("ERROR", "1.0", "end")
+        try:
             try:
                 # If successful, return the compiled code
                 return compile(source, filename, "exec")
@@ -106,6 +110,8 @@ class ScriptBinding:
                 self.errorbox("Syntax error",
                               "There's an error in your program:\n" + msg)
                 return False
+        finally:
+            shell.set_warning_stream(saved_stream)
 
     def colorize_syntax_error(self, msg, lineno, offset):
         text = self.editwin.text
@@ -135,10 +141,7 @@ class ScriptBinding:
         code = self.checksyntax(filename)
         if not code:
             return
-        flist = self.editwin.flist
-        shell = flist.open_shell()
-        if not shell:
-            return  # couldn't open the shell
+        shell = self.shell
         interp = shell.interp
         if PyShell.use_subprocess:
             shell.restart_shell()
@@ -156,6 +159,9 @@ class ScriptBinding:
             del _filename, _sys, _basename, _os
             \n""" % (filename, dirname))
         interp.prepend_syspath(filename)
+        # XXX KBK 03Jul04 When run w/o subprocess, runtime warnings still
+        #         go to __stderr__.  With subprocess, they go to the shell.
+        #         Need to change streams in PyShell.ModifiedInterpreter.
         interp.runcode(code)
 
     def getfilename(self):

Lib/idlelib/run.py

@@ -1,5 +1,6 @@
 import sys
 import os
+import linecache
 import time
 import socket
 import traceback
@@ -17,6 +18,22 @@ import __main__
 
 LOCALHOST = '127.0.0.1'
 
+try:
+    import warnings
+except ImportError:
+    pass
+else:
+    def idle_formatwarning_subproc(message, category, filename, lineno):
+        """Format warnings the IDLE way"""
+        s = "\nWarning (from warnings module):\n"
+        s += '  File \"%s\", line %s\n' % (filename, lineno)
+        line = linecache.getline(filename, lineno).strip()
+        if line:
+            s += "    %s\n" % line
+        s += "%s: %s\n" % (category.__name__, message)
+        return s
+    warnings.formatwarning = idle_formatwarning_subproc
+
 # Thread shared globals: Establish a queue between a subthread (which handles
 # the socket) and the main thread (which runs user code), plus global
 # completion and exit flags: