- Add a new ipconfig() public function for manipulating the internal rc

configuration structure.

- Add a new system_header variable to allow customizations of the system
header printed when making system calls.

IPython/Magic.py

@@ -1,7 +1,7 b''
 # -*- coding: utf-8 -*-
 """Magic functions for InteractiveShell.
 
-$Id: Magic.py 1846 2006-10-28 07:51:56Z vivainio $"""
+$Id: Magic.py 1879 2006-11-04 00:34:34Z fptest $"""
 
 #*****************************************************************************
 #       Copyright (C) 2001 Janko Hauser <[e-mail]> and
@@ -502,9 +502,16 b' Currently the magic system has the following functions:\\n"""'
         print "Automatic indentation is:",['OFF','ON'][self.shell.autoindent]
 
     def magic_system_verbose(self, parameter_s = ''):
-        """Toggle verbose printing of system calls on/off."""
+        """Set verbose printing of system calls.
 
-        self.shell.rc_set_toggle('system_verbose')
+        If called without an argument, act as a toggle"""
+
+        if parameter_s:
+            val = bool(eval(parameter_s))
+        else:
+            val = None
+            
+        self.shell.rc_set_toggle('system_verbose',val)
         print "System verbose printing is:",\
               ['OFF','ON'][self.shell.rc.system_verbose]
 
@@ -1005,10 +1012,52 b' Currently the magic system has the following functions:\\n"""'
             del(user_ns[i])
 
     def magic_config(self,parameter_s=''):
-        """Show IPython's internal configuration."""
+        """Handle IPython's internal configuration.
+
+        If called without arguments, it will print IPython's complete internal
+        configuration.
+
+        If called with one argument, it will print the value of that key in
+        the configuration.
+
+        If called with more than one argument, the first is interpreted as a
+        key and the rest as a Python expression which gets eval()'d.
+
+        Examples:
+
+            In [1]: s='A Python string'
+
+            In [2]: !echo $s
+            A Python string
         
-        page('Current configuration structure:\n'+
-             pformat(self.shell.rc.dict()))
+            In [3]: config system_verbose True
+
+            In [4]: !echo $s
+            IPython system call: echo A Python string
+            A Python string
+
+            In [5]: %config system_header 'sys> '
+
+            In [6]: !echo $s
+            sys> echo A Python string
+            A Python string
+
+            # Notice the extra quotes to protect the string after interpolation:
+            In [7]: header = "'sys2> '"
+
+            In [8]: %config system_header $header
+
+            In [9]: !echo $s
+            sys2> echo A Python string
+            A Python string
+        """
+
+        args = parameter_s.split(None,1)
+        key = args[0]
+        if len(args)==1:
+            self.shell.ipconfig(key)
+        else:
+            self.shell.ipconfig(key,eval(args[1]))
 
     def magic_logstart(self,parameter_s=''):
         """Start logging anywhere in a session.

IPython/UserConfig/ipythonrc

@@ -1,5 +1,5 b''
 # -*- Mode: Shell-Script -*-  Not really, but shows comments correctly
-# $Id: ipythonrc 1329 2006-05-26 07:52:45Z fperez $
+# $Id: ipythonrc 1879 2006-11-04 00:34:34Z fptest $
 
 #***************************************************************************
 #
@@ -340,6 +340,15 b' xmode Context'
 
 multi_line_specials 1
 
+
+# System calls: When IPython makes system calls (e.g. via special syntax like
+# !cmd or !!cmd, or magics like %sc or %sx), it can print the command it is
+# executing to standard output, prefixed by a header string.
+
+system_header "IPython system call: "
+
+system_verbose 1
+
 # wxversion: request a specific wxPython version (used for -wthread)
 
 # Set this to the value of wxPython you want to use, but note that this

IPython/iplib.py

@@ -6,7 +6,7 b' Requires Python 2.3 or newer.'
 
 This file contains all the classes and helper functions specific to IPython.
 
-$Id: iplib.py 1878 2006-11-03 23:00:22Z fptest $
+$Id: iplib.py 1879 2006-11-04 00:34:34Z fptest $
 """
 
 #*****************************************************************************
@@ -464,16 +464,18 b' class InteractiveShell(object,Magic):'
         # and it allows interpolation of variables in the user's namespace.
         self.system = lambda cmd: \
                       shell(self.var_expand(cmd,depth=2),
-                            header='IPython system call: ',
+                            header=self.rc.system_header,
                             verbose=self.rc.system_verbose)
+
         # These are for getoutput and getoutputerror:
         self.getoutput = lambda cmd: \
                          getoutput(self.var_expand(cmd,depth=2),
-                                   header='IPython system call: ',
+                                   header=self.rc.system_header,
                                    verbose=self.rc.system_verbose)
+
         self.getoutputerror = lambda cmd: \
                               getoutputerror(self.var_expand(cmd,depth=2),
-                                             header='IPython system call: ',
+                                             header=self.rc.system_header,
                                              verbose=self.rc.system_verbose)
  
         # RegExp for splitting line contents into pre-char//first
@@ -726,6 +728,7 b' class InteractiveShell(object,Magic):'
                              ipmagic = self.ipmagic,  
                              ipalias = self.ipalias,  
                              ipsystem = self.ipsystem,
+                             ipconfig = self.ipconfig,
                              _ip = self.api
                              )
         for biname,bival in builtins_new.items():
@@ -961,6 +964,29 b' class InteractiveShell(object,Magic):'
         else:
             error("Alias `%s` not found." % alias_name)
 
+    def ipconfig(self,key=None,value=None):
+        """Manipulate the IPython config.
+
+        This provides a python interface to 
+        If called with no arguments, it prints the internal IPython config
+
+        Optional arguments:
+
+          - key(None): if given, what key of the rc structure to return.
+
+          - value(None): if given, set the key to this value."""
+
+        if key is None:
+            page('Current configuration structure:\n'+
+                 pformat(self.rc.dict()))
+        else:
+            if value is None:
+                print '%s -> %s' % (key,self.rc[key])
+            else:
+                if key not in self.rc:
+                    raise KeyError(str(key))
+                self.rc[key] = value
+
     def ipsystem(self,arg_s):
         """Make a system call, using IPython."""
 

IPython/ipmaker.py

@@ -6,7 +6,7 b' Requires Python 2.1 or better.'
 
 This file contains the main make_IPython() starter function.
 
-$Id: ipmaker.py 1384 2006-06-29 20:04:37Z vivainio $"""
+$Id: ipmaker.py 1879 2006-11-04 00:34:34Z fptest $"""
 
 #*****************************************************************************
 #       Copyright (C) 2001-2006 Fernando Perez. <[e-mail]>
@@ -218,6 +218,7 b" object? -> Details about 'object'. ?object also works, ?? prints more."
                       separate_in = '\n',
                       separate_out = '\n',
                       separate_out2 = '',
+                      system_header = 'IPython system call: ',
                       system_verbose = 0,
                       gthread = 0,
                       qthread = 0,

IPython/irunner.py

@@ -299,7 +299,16 b' def main():'
     runners = dict(ipython=IPythonRunner,
                    python=PythonRunner,
                    sage=SAGERunner)
-    runners[opts.mode]().main(args)
+
+    try:
+        ext = os.path.splitext(args[0])
+    except IndexError:
+        ext = ''
+    modes = {'.ipy':'ipython',
+             '.py':'python',
+             '.sage':'sage'}
+    mode = modes.get(ext,opts.mode)
+    runners[mode]().main(args)
 
 if __name__ == '__main__':
     main()

doc/ChangeLog

@@ -1,3 +1,16 b''
[phone]  Fernando Perez  <[e-mail]>
+
+	* IPython/iplib.py (InteractiveShell.ipconfig): new builtin, also
+	visible in ipapi as ip.config(), to programatically control the
+	internal rc object.  There's an accompanying %config magic for
+	interactive use, which has been enhanced to match the
+	funtionality in ipconfig.
+
+	* IPython/Magic.py (magic_system_verbose): Change %system_verbose
+	so it's not just a toggle, it now takes an argument.  Add support
+	for a customizable header when making system calls, as the new
+	system_header variable in the ipythonrc file.
+
 2006-11-03  Walter Doerwald  <[e-mail]>
 
 	* IPython/Extensions/ipipe.py: xrepr(), xiter() and xattrs() are now