added --colors flag to ipythonqt

IPython/frontend/qt/console/ipython_widget.py

@@ -1,456 +1,460 b''
 """ A FrontendWidget that emulates the interface of the console IPython and
     supports the additional functionality provided by the IPython kernel.
 
     TODO: Add support for retrieving the system default editor. Requires code
           paths for Windows (use the registry), Mac OS (use LaunchServices), and
           Linux (use the xdg system).
 """
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 # Standard library imports
 from collections import namedtuple
 import re
 from subprocess import Popen
 from textwrap import dedent
 
 # System library imports
 from PyQt4 import QtCore, QtGui
 
 # Local imports
 from IPython.core.inputsplitter import IPythonInputSplitter, \
     transform_ipy_prompt
 from IPython.core.usage import default_gui_banner
 from IPython.utils.traitlets import Bool, Str
 from frontend_widget import FrontendWidget
-from styles import (default_light_style_sheet,  default_dark_style_sheet,
-                    default_light_syntax_style, default_dark_syntax_style)
+from styles import (default_light_style_sheet,  default_light_syntax_style,
+                    default_dark_style_sheet, default_dark_syntax_style,
+                    default_bw_style_sheet, default_bw_syntax_style)
 
 #-----------------------------------------------------------------------------
 # Constants
 #-----------------------------------------------------------------------------
 
 # Default strings to build and display input and output prompts (and separators
 # in between)
 default_in_prompt = 'In [<span class="in-prompt-number">%i</span>]: '
 default_out_prompt = 'Out[<span class="out-prompt-number">%i</span>]: '
 default_input_sep = '\n'
 default_output_sep = ''
 default_output_sep2 = ''
 
 # Base path for most payload sources.
 zmq_shell_source = 'IPython.zmq.zmqshell.ZMQInteractiveShell'
 
 #-----------------------------------------------------------------------------
 # IPythonWidget class
 #-----------------------------------------------------------------------------
 
 class IPythonWidget(FrontendWidget):
     """ A FrontendWidget for an IPython kernel.
     """
 
     # If set, the 'custom_edit_requested(str, int)' signal will be emitted when
     # an editor is needed for a file. This overrides 'editor' and 'editor_line'
     # settings.
     custom_edit = Bool(False)
     custom_edit_requested = QtCore.pyqtSignal(object, object)
 
     # A command for invoking a system text editor. If the string contains a
     # {filename} format specifier, it will be used. Otherwise, the filename will
     # be appended to the end the command.
     editor = Str('default', config=True)
 
     # The editor command to use when a specific line number is requested. The
     # string should contain two format specifiers: {line} and {filename}. If
     # this parameter is not specified, the line number option to the %edit magic
     # will be ignored.
     editor_line = Str(config=True)
 
     # A CSS stylesheet. The stylesheet can contain classes for:
     #     1. Qt: QPlainTextEdit, QFrame, QWidget, etc
     #     2. Pygments: .c, .k, .o, etc (see PygmentsHighlighter)
     #     3. IPython: .error, .in-prompt, .out-prompt, etc
     style_sheet = Str(config=True)
     
     # If not empty, use this Pygments style for syntax highlighting. Otherwise,
     # the style sheet is queried for Pygments style information.
     syntax_style = Str(config=True)
 
     # Prompts.
     in_prompt = Str(default_in_prompt, config=True)
     out_prompt = Str(default_out_prompt, config=True)
     input_sep = Str(default_input_sep, config=True)
     output_sep = Str(default_output_sep, config=True)
     output_sep2 = Str(default_output_sep2, config=True)
 
     # FrontendWidget protected class variables.
     _input_splitter_class = IPythonInputSplitter
 
     # IPythonWidget protected class variables.
     _PromptBlock = namedtuple('_PromptBlock', ['block', 'length', 'number'])
     _payload_source_edit = zmq_shell_source + '.edit_magic'
     _payload_source_exit = zmq_shell_source + '.ask_exit'
     _payload_source_loadpy = zmq_shell_source + '.magic_loadpy'
     _payload_source_page = 'IPython.zmq.page.page'
 
     #---------------------------------------------------------------------------
     # 'object' interface
     #---------------------------------------------------------------------------
     
     def __init__(self, *args, **kw):
         super(IPythonWidget, self).__init__(*args, **kw)
 
         # IPythonWidget protected variables.
         self._code_to_load = None
         self._payload_handlers = { 
             self._payload_source_edit : self._handle_payload_edit,
             self._payload_source_exit : self._handle_payload_exit,
             self._payload_source_page : self._handle_payload_page,
             self._payload_source_loadpy : self._handle_payload_loadpy }
         self._previous_prompt_obj = None
 
         # Initialize widget styling.
         if self.style_sheet:
             self._style_sheet_changed()
             self._syntax_style_changed()
         else:
             self.set_default_style()
 
     #---------------------------------------------------------------------------
     # 'BaseFrontendMixin' abstract interface
     #---------------------------------------------------------------------------
 
     def _handle_complete_reply(self, rep):
         """ Reimplemented to support IPython's improved completion machinery.
         """
         cursor = self._get_cursor()
         info = self._request_info.get('complete')
         if info and info.id == rep['parent_header']['msg_id'] and \
                 info.pos == cursor.position():
             matches = rep['content']['matches']
             text = rep['content']['matched_text']
             offset = len(text)
 
             # Clean up matches with period and path separators if the matched
             # text has not been transformed. This is done by truncating all
             # but the last component and then suitably decreasing the offset
             # between the current cursor position and the start of completion.
             if len(matches) > 1 and matches[0][:offset] == text:
                 parts = re.split(r'[./\\]', text) 
                 sep_count = len(parts) - 1
                 if sep_count:
                     chop_length = sum(map(len, parts[:sep_count])) + sep_count
                     matches = [ match[chop_length:] for match in matches ]
                     offset -= chop_length
 
             # Move the cursor to the start of the match and complete.
             cursor.movePosition(QtGui.QTextCursor.Left, n=offset)
             self._complete_with_items(cursor, matches)
 
     def _handle_execute_reply(self, msg):
         """ Reimplemented to support prompt requests.
         """
         info = self._request_info.get('execute')
         if info and info.id == msg['parent_header']['msg_id']:
             if info.kind == 'prompt':
                 number = msg['content']['execution_count'] + 1
                 self._show_interpreter_prompt(number)
             else:
                 super(IPythonWidget, self)._handle_execute_reply(msg)
 
     def _handle_history_reply(self, msg):
         """ Implemented to handle history replies, which are only supported by
             the IPython kernel.
         """
         history_dict = msg['content']['history']
         items = [ history_dict[key] for key in sorted(history_dict.keys()) ]
         self._set_history(items)
 
     def _handle_pyout(self, msg):
         """ Reimplemented for IPython-style "display hook".
         """
         if not self._hidden and self._is_from_this_session(msg):
             content = msg['content']
             prompt_number = content['execution_count']
             self._append_plain_text(self.output_sep)
             self._append_html(self._make_out_prompt(prompt_number))
             self._append_plain_text(content['data']+self.output_sep2)
 
     def _started_channels(self):
         """ Reimplemented to make a history request.
         """
         super(IPythonWidget, self)._started_channels()
         # FIXME: Disabled until history requests are properly implemented.
         #self.kernel_manager.xreq_channel.history(raw=True, output=False)
 
     #---------------------------------------------------------------------------
     # 'ConsoleWidget' public interface
     #---------------------------------------------------------------------------
 
     def copy(self):
         """ Copy the currently selected text to the clipboard, removing prompts
             if possible.
         """
         text = unicode(self._control.textCursor().selection().toPlainText())
         if text:
             lines = map(transform_ipy_prompt, text.splitlines())
             text = '\n'.join(lines)
             QtGui.QApplication.clipboard().setText(text)
 
     #---------------------------------------------------------------------------
     # 'FrontendWidget' public interface
     #---------------------------------------------------------------------------
 
     def execute_file(self, path, hidden=False):
         """ Reimplemented to use the 'run' magic.
         """
         self.execute('%%run %s' % path, hidden=hidden)
 
     #---------------------------------------------------------------------------
     # 'FrontendWidget' protected interface
     #---------------------------------------------------------------------------
 
     def _complete(self):
         """ Reimplemented to support IPython's improved completion machinery.
         """
         # We let the kernel split the input line, so we *always* send an empty
         # text field. Readline-based frontends do get a real text field which
         # they can use.
         text = ''
         
         # Send the completion request to the kernel
         msg_id = self.kernel_manager.xreq_channel.complete(
             text,                                    # text
             self._get_input_buffer_cursor_line(),    # line
             self._get_input_buffer_cursor_column(),  # cursor_pos
             self.input_buffer)                       # block 
         pos = self._get_cursor().position()
         info = self._CompletionRequest(msg_id, pos)
         self._request_info['complete'] = info
 
     def _get_banner(self):
         """ Reimplemented to return IPython's default banner.
         """
         return default_gui_banner
 
     def _process_execute_error(self, msg):
         """ Reimplemented for IPython-style traceback formatting.
         """
         content = msg['content']
         traceback = '\n'.join(content['traceback']) + '\n'
         if False:
             # FIXME: For now, tracebacks come as plain text, so we can't use
             # the html renderer yet.  Once we refactor ultratb to produce
             # properly styled tracebacks, this branch should be the default
             traceback = traceback.replace(' ', '&nbsp;')
             traceback = traceback.replace('\n', '<br/>')
 
             ename = content['ename']
             ename_styled = '<span class="error">%s</span>' % ename
             traceback = traceback.replace(ename, ename_styled)
 
             self._append_html(traceback)
         else:
             # This is the fallback for now, using plain text with ansi escapes
             self._append_plain_text(traceback)    
 
     def _process_execute_payload(self, item):
         """ Reimplemented to dispatch payloads to handler methods.
         """
         handler = self._payload_handlers.get(item['source'])
         if handler is None:
             # We have no handler for this type of payload, simply ignore it
             return False
         else:
             handler(item)
             return True
         
     def _show_interpreter_prompt(self, number=None):
         """ Reimplemented for IPython-style prompts.
         """
         # If a number was not specified, make a prompt number request.
         if number is None:
             msg_id = self.kernel_manager.xreq_channel.execute('', silent=True)
             info = self._ExecutionRequest(msg_id, 'prompt')
             self._request_info['execute'] = info
             return
 
         # Show a new prompt and save information about it so that it can be
         # updated later if the prompt number turns out to be wrong.
         self._prompt_sep = self.input_sep
         self._show_prompt(self._make_in_prompt(number), html=True)
         block = self._control.document().lastBlock()
         length = len(self._prompt)
         self._previous_prompt_obj = self._PromptBlock(block, length, number)
 
         # Update continuation prompt to reflect (possibly) new prompt length.
         self._set_continuation_prompt(
             self._make_continuation_prompt(self._prompt), html=True)
 
         # Load code from the %loadpy magic, if necessary.
         if self._code_to_load is not None:
             self.input_buffer = dedent(unicode(self._code_to_load).rstrip())
             self._code_to_load = None
 
     def _show_interpreter_prompt_for_reply(self, msg):
         """ Reimplemented for IPython-style prompts.
         """
         # Update the old prompt number if necessary.
         content = msg['content']
         previous_prompt_number = content['execution_count']
         if self._previous_prompt_obj and \
                 self._previous_prompt_obj.number != previous_prompt_number:
             block = self._previous_prompt_obj.block
 
             # Make sure the prompt block has not been erased.
             if block.isValid() and not block.text().isEmpty():
 
                 # Remove the old prompt and insert a new prompt.
                 cursor = QtGui.QTextCursor(block)
                 cursor.movePosition(QtGui.QTextCursor.Right,
                                     QtGui.QTextCursor.KeepAnchor, 
                                     self._previous_prompt_obj.length)
                 prompt = self._make_in_prompt(previous_prompt_number)
                 self._prompt = self._insert_html_fetching_plain_text(
                     cursor, prompt)
 
                 # When the HTML is inserted, Qt blows away the syntax
                 # highlighting for the line, so we need to rehighlight it.
                 self._highlighter.rehighlightBlock(cursor.block())
 
             self._previous_prompt_obj = None
 
         # Show a new prompt with the kernel's estimated prompt number.
         self._show_interpreter_prompt(previous_prompt_number + 1)
 
     #---------------------------------------------------------------------------
     # 'IPythonWidget' interface
     #---------------------------------------------------------------------------
 
-    def set_default_style(self, lightbg=True):
+    def set_default_style(self, colors='light'):
         """ Sets the widget style to the class defaults.
 
         Parameters:
         -----------
-        lightbg : bool, optional (default True)
+        colors : str, optional (default light)
             Whether to use the default IPython light background or dark
-            background style.
+            background or B&W style.
         """
-        if lightbg:
+        if colors=='light':
             self.style_sheet = default_light_style_sheet
             self.syntax_style = default_light_syntax_style
-        else:
+        elif colors=='dark':
             self.style_sheet = default_dark_style_sheet
             self.syntax_style = default_dark_syntax_style
+        elif colors=='bw':
+            self.style_sheet = default_bw_style_sheet
+            self.syntax_style = default_bw_syntax_style
 
     #---------------------------------------------------------------------------
     # 'IPythonWidget' protected interface
     #---------------------------------------------------------------------------
 
     def _edit(self, filename, line=None):
         """ Opens a Python script for editing.
 
         Parameters:
         -----------
         filename : str
             A path to a local system file.
 
         line : int, optional
             A line of interest in the file.
         """
         if self.custom_edit:
             self.custom_edit_requested.emit(filename, line)
         elif self.editor == 'default':
             self._append_plain_text('No default editor available.\n')
         else:
             try:
                 filename = '"%s"' % filename
                 if line and self.editor_line:
                     command = self.editor_line.format(filename=filename,
                                                       line=line)
                 else:
                     try:
                         command = self.editor.format()
                     except KeyError:
                         command = self.editor.format(filename=filename)
                     else:
                         command += ' ' + filename
             except KeyError:
                 self._append_plain_text('Invalid editor command.\n')
             else:
                 try:
                     Popen(command, shell=True)
                 except OSError:
                     msg = 'Opening editor with command "%s" failed.\n'
                     self._append_plain_text(msg % command)
 
     def _make_in_prompt(self, number):
         """ Given a prompt number, returns an HTML In prompt.
         """
         body = self.in_prompt % number
         return '<span class="in-prompt">%s</span>' % body
 
     def _make_continuation_prompt(self, prompt):
         """ Given a plain text version of an In prompt, returns an HTML
             continuation prompt.
         """
         end_chars = '...: '
         space_count = len(prompt.lstrip('\n')) - len(end_chars)
         body = '&nbsp;' * space_count + end_chars
         return '<span class="in-prompt">%s</span>' % body
         
     def _make_out_prompt(self, number):
         """ Given a prompt number, returns an HTML Out prompt.
         """
         body = self.out_prompt % number
         return '<span class="out-prompt">%s</span>' % body
 
     #------ Payload handlers --------------------------------------------------
 
     # Payload handlers with a generic interface: each takes the opaque payload
     # dict, unpacks it and calls the underlying functions with the necessary
     # arguments.
 
     def _handle_payload_edit(self, item):
         self._edit(item['filename'], item['line_number'])
 
     def _handle_payload_exit(self, item):
         self.exit_requested.emit()
 
     def _handle_payload_loadpy(self, item):
         # Simple save the text of the .py file for later. The text is written
         # to the buffer when _prompt_started_hook is called.
         self._code_to_load = item['text']
 
     def _handle_payload_page(self, item):
         # Since the plain text widget supports only a very small subset of HTML
         # and we have no control over the HTML source, we only page HTML
         # payloads in the rich text widget.
         if item['html'] and self.kind == 'rich':
             self._page(item['html'], html=True)
         else:
             self._page(item['text'], html=False)
 
     #------ Trait change handlers ---------------------------------------------
 
     def _style_sheet_changed(self):
         """ Set the style sheets of the underlying widgets.
         """
         self.setStyleSheet(self.style_sheet)
         self._control.document().setDefaultStyleSheet(self.style_sheet)
         if self._page_control:
             self._page_control.document().setDefaultStyleSheet(self.style_sheet)
 
         bg_color = self._control.palette().background().color()
         self._ansi_processor.set_background_color(bg_color)
 
     def _syntax_style_changed(self):
         """ Set the style for the syntax highlighter.
         """
         if self.syntax_style:
             self._highlighter.set_style(self.syntax_style)
         else:
             self._highlighter.set_style_sheet(self.style_sheet)
         

IPython/frontend/qt/console/ipythonqt.py

@@ -1,235 +1,247 b''
 """ A minimal application using the Qt console-style IPython frontend.
 """
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 # Systemm library imports
 from PyQt4 import QtGui
 from pygments.styles import get_all_styles
 # Local imports
 from IPython.external.argparse import ArgumentParser
 from IPython.frontend.qt.console.frontend_widget import FrontendWidget
 from IPython.frontend.qt.console.ipython_widget import IPythonWidget
 from IPython.frontend.qt.console.rich_ipython_widget import RichIPythonWidget
 from IPython.frontend.qt.console import styles
 from IPython.frontend.qt.kernelmanager import QtKernelManager
 
 #-----------------------------------------------------------------------------
 # Network Constants
 #-----------------------------------------------------------------------------
 
 from IPython.utils.localinterfaces import LOCALHOST, LOCAL_IPS
 
 #-----------------------------------------------------------------------------
 # Classes
 #-----------------------------------------------------------------------------
 
 class MainWindow(QtGui.QMainWindow):
 
     #---------------------------------------------------------------------------
     # 'object' interface
     #---------------------------------------------------------------------------
     
     def __init__(self, app, frontend, existing=False, may_close=True):
         """ Create a MainWindow for the specified FrontendWidget.
         
         The app is passed as an argument to allow for different
         closing behavior depending on whether we are the Kernel's parent.
         
         If existing is True, then this Console does not own the Kernel.
         
         If may_close is True, then this Console is permitted to close the kernel
         """
         super(MainWindow, self).__init__()
         self._app = app
         self._frontend = frontend
         self._existing = existing
         if existing:
             self._may_close = may_close
         else:
             self._may_close = True
         self._frontend.exit_requested.connect(self.close)
         self.setCentralWidget(frontend)
     
     #---------------------------------------------------------------------------
     # QWidget interface
     #---------------------------------------------------------------------------
     
     def closeEvent(self, event):
         """ Reimplemented to prompt the user and close the kernel cleanly.
         """
         kernel_manager = self._frontend.kernel_manager
         if kernel_manager and kernel_manager.channels_running:
             title = self.window().windowTitle()
             cancel = QtGui.QMessageBox.Cancel
             okay = QtGui.QMessageBox.Ok
             if self._may_close:
                 msg = "You are closing this Console window."
                 info = "Would you like to quit the Kernel and all attached Consoles as well?"
                 justthis = QtGui.QPushButton("&No, just this Console", self)
                 justthis.setShortcut('N')
                 closeall = QtGui.QPushButton("&Yes, quit everything", self)
                 closeall.setShortcut('Y')
                 box = QtGui.QMessageBox(QtGui.QMessageBox.Question, title, msg)
                 box.setInformativeText(info)
                 box.addButton(cancel)
                 box.addButton(justthis, QtGui.QMessageBox.NoRole)
                 box.addButton(closeall, QtGui.QMessageBox.YesRole)
                 box.setDefaultButton(closeall)
                 box.setEscapeButton(cancel)
                 reply = box.exec_()
                 if reply == 1: # close All
                     kernel_manager.shutdown_kernel()
                     #kernel_manager.stop_channels()
                     event.accept()
                 elif reply == 0: # close Console
                     if not self._existing:
                         # I have the kernel: don't quit, just close the window
                         self._app.setQuitOnLastWindowClosed(False)
                         self.deleteLater()
                     event.accept()
                 else:
                     event.ignore()
             else:
                 reply = QtGui.QMessageBox.question(self, title,
                     "Are you sure you want to close this Console?"+
                     "\nThe Kernel and other Consoles will remain active.",
                     okay|cancel,
                     defaultButton=okay
                     )
                 if reply == okay:
                     event.accept()
                 else:
                     event.ignore()
             
 
 #-----------------------------------------------------------------------------
 # Main entry point
 #-----------------------------------------------------------------------------
 
 def main():
     """ Entry point for application.
     """
     # Parse command line arguments.
     parser = ArgumentParser()
     kgroup = parser.add_argument_group('kernel options')
     kgroup.add_argument('-e', '--existing', action='store_true',
                         help='connect to an existing kernel')
     kgroup.add_argument('--ip', type=str, default=LOCALHOST,
                         help=\
             "set the kernel\'s IP address [default localhost].\
             If the IP address is something other than localhost, then \
             Consoles on other machines will be able to connect\
             to the Kernel, so be careful!")
     kgroup.add_argument('--xreq', type=int, metavar='PORT', default=0,
                         help='set the XREQ channel port [default random]')
     kgroup.add_argument('--sub', type=int, metavar='PORT', default=0,
                         help='set the SUB channel port [default random]')
     kgroup.add_argument('--rep', type=int, metavar='PORT', default=0,
                         help='set the REP channel port [default random]')
     kgroup.add_argument('--hb', type=int, metavar='PORT', default=0,
                         help='set the heartbeat port [default random]')
 
     egroup = kgroup.add_mutually_exclusive_group()
     egroup.add_argument('--pure', action='store_true', help = \
                         'use a pure Python kernel instead of an IPython kernel')
     egroup.add_argument('--pylab', type=str, metavar='GUI', nargs='?', 
                        const='auto', help = \
         "Pre-load matplotlib and numpy for interactive use. If GUI is not \
          given, the GUI backend is matplotlib's, otherwise use one of: \
          ['tk', 'gtk', 'qt', 'wx', 'inline'].")
 
     wgroup = parser.add_argument_group('widget options')
     wgroup.add_argument('--paging', type=str, default='inside',
                         choices = ['inside', 'hsplit', 'vsplit', 'none'],
                         help='set the paging style [default inside]')
     wgroup.add_argument('--rich', action='store_true',
                         help='enable rich text support')
     wgroup.add_argument('--gui-completion', action='store_true',
                         help='use a GUI widget for tab completion')
     wgroup.add_argument('--style', type=str,
-                        help='specify a pygments style by name. \
-                        Valid are: %s'%(list(get_all_styles())))
+                        choices = list(get_all_styles()),
+                        help='specify a pygments style for by name.')
     wgroup.add_argument('--stylesheet', type=str,
                         help="path to a custom CSS stylesheet.")
-    wgroup.add_argument('--dark', action='store_true',
-                        help="use the dark style template instead of lightbg.\
-                        If --style is not specified, the default dark style is used.")
+    wgroup.add_argument('--colors', type=str,
+                        help="Set the color scheme (light, dark, or bw). This is guessed\
+                        based on the pygments style if not set.")
 
     args = parser.parse_args()
 
     # Don't let Qt or ZMQ swallow KeyboardInterupts.
     import signal
     signal.signal(signal.SIGINT, signal.SIG_DFL)
 
     # Create a KernelManager and start a kernel.
     kernel_manager = QtKernelManager(xreq_address=(args.ip, args.xreq),
                                      sub_address=(args.ip, args.sub),
                                      rep_address=(args.ip, args.rep),
                                      hb_address=(args.ip, args.hb))
     if not args.existing:
         # if not args.ip in LOCAL_IPS+ALL_ALIAS:
         #     raise ValueError("Must bind a local ip, such as: %s"%LOCAL_IPS)
         
         kwargs = dict(ip=args.ip)
         if args.pure:
             kwargs['ipython']=False
         elif args.pylab:
             kwargs['pylab']=args.pylab
             
         kernel_manager.start_kernel(**kwargs)
     kernel_manager.start_channels()
 
     local_kernel = (not args.existing) or args.ip in LOCAL_IPS
     # Create the widget.
     app = QtGui.QApplication([])
     if args.pure:
         kind = 'rich' if args.rich else 'plain'
         widget = FrontendWidget(kind=kind, paging=args.paging, local_kernel=local_kernel)
     elif args.rich or args.pylab:
         widget = RichIPythonWidget(paging=args.paging, local_kernel=local_kernel)
     else:
         widget = IPythonWidget(paging=args.paging, local_kernel=local_kernel)
     widget.gui_completion = args.gui_completion
     widget.kernel_manager = kernel_manager
 
     # configure the style:
     if not args.pure: # only IPythonWidget supports styles
+        # parse the colors arg down to current known labels
+        if args.colors:
+            colors=args.colors.lower()
+            if colors in ('lightbg', 'light'):
+                colors='light'
+            elif colors in ('dark', 'linux'):
+                colors='dark'
+            else:
+                colors='nocolor'
+        else:
+            colors=None
+        lightbg = colors != 'linux'
+
         if args.style:
             # guess whether it's a dark style:
-            dark = args.dark or styles.dark_style(args.style)
             widget.syntax_style = args.style
-            widget.style_sheet = styles.sheet_from_template(args.style, not dark)
+            widget.style_sheet = styles.sheet_from_template(args.style, lightbg)
             widget._syntax_style_changed()
             widget._style_sheet_changed()
-        elif args.dark:
-            # use default dark style
-            widget.set_default_style(lightbg=False)
+        elif colors:
+            # use a default style
+            widget.set_default_style(colors=colors)
         else:
             # this is redundant for now, but allows the widget's
             # defaults to change
-            widget.set_default_style(lightbg=True)
+            widget.set_default_style()
 
         if args.stylesheet:
             # we got an expicit stylesheet
             if os.path.isfile(args.stylesheet):
                 with open(args.stylesheet) as f:
                     sheet = f.read()
                 widget.style_sheet = sheet
                 widget._style_sheet_changed()
             else:
                 raise IOError("Stylesheet %r not found."%args.stylesheet)
 
     # Create the main window.
     window = MainWindow(app, widget, args.existing, may_close=local_kernel)
     window.setWindowTitle('Python' if args.pure else 'IPython')
     window.show()
 
     # Start the application main loop.
     app.exec_()
 
 
 if __name__ == '__main__':
     main()

IPython/frontend/qt/console/styles.py

@@ -1,102 +1,119 b''
 """ Style utilities, templates, and defaults for syntax highlighting widgets.
 """
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 from colorsys import rgb_to_hls
 from pygments.styles import get_style_by_name
 from pygments.token import Token
 
 #-----------------------------------------------------------------------------
 # Constants
 #-----------------------------------------------------------------------------
 
 # The default light style sheet: black text on a white background.
 default_light_style_template = '''
     QPlainTextEdit, QTextEdit { background-color: %(bgcolor)s;
             color: %(fgcolor)s ;
             selection-background-color: %(select)s}
     .error { color: red; }
     .in-prompt { color: navy; }
     .in-prompt-number { font-weight: bold; }
     .out-prompt { color: darkred; }
     .out-prompt-number { font-weight: bold; }
 '''
 default_light_style_sheet = default_light_style_template%dict(
                 bgcolor='white', fgcolor='black', select="#ccc")
 default_light_syntax_style = 'default'
 
 # The default dark style sheet: white text on a black background.
 default_dark_style_template = '''
     QPlainTextEdit, QTextEdit { background-color: %(bgcolor)s;
             color: %(fgcolor)s ;
             selection-background-color: %(select)s}
     QFrame { border: 1px solid grey; }
     .error { color: red; }
     .in-prompt { color: lime; }
     .in-prompt-number { color: lime; font-weight: bold; }
     .out-prompt { color: red; }
     .out-prompt-number { color: red; font-weight: bold; }
 '''
 default_dark_style_sheet = default_dark_style_template%dict(
                 bgcolor='black', fgcolor='white', select="#555")
 default_dark_syntax_style = 'monokai'
 
+# The default monochrome
+default_bw_style_sheet = '''
+    QPlainTextEdit, QTextEdit { background-color: white;
+            color: black ;
+            selection-background-color: #cccccc}
+    .in-prompt-number { font-weight: bold; }
+    .out-prompt-number { font-weight: bold; }
+'''
+default_bw_syntax_style = 'bw'
+
+
 def hex_to_rgb(color):
     """Convert a hex color to rgb integer tuple."""
     if color.startswith('#'):
         color = color[1:]
     if len(color) == 3:
         color = ''.join([c*2 for c in color])
     if len(color) != 6:
         return False
     try:
         r = int(color[:2],16)
         g = int(color[:2],16)
         b = int(color[:2],16)
     except ValueError:
         return False
     else:
         return r,g,b
 
 def dark_color(color):
     """Check whether a color is 'dark'.
 
     Currently, this is simply whether the luminance is <50%"""
     rgb = hex_to_rgb(color)
     if rgb:
         return rgb_to_hls(*rgb)[1] < 128
     else: # default to False
         return False
 
 def dark_style(stylename):
     """Guess whether the background of the style with name 'stylename'
     counts as 'dark'."""
     return dark_color(get_style_by_name(stylename).background_color)
 
 def get_colors(stylename):
-    """Construct the keys to be used building the base stylesheet."""
+    """Construct the keys to be used building the base stylesheet
+    from a templatee."""
     style = get_style_by_name(stylename)
     fgcolor = style.style_for_token(Token.Text)['color'] or ''
     if len(fgcolor) in (3,6):
         # could be 'abcdef' or 'ace' hex, which needs '#' prefix
         try:
             int(fgcolor, 16)
         except TypeError:
             pass
         else:
             fgcolor = "#"+fgcolor
 
     return dict(
         bgcolor = style.background_color,
         select = style.highlight_color,
         fgcolor = fgcolor
     )
 
-def sheet_from_template(name, lightbg=True):
+def sheet_from_template(name, colors='light'):
     """Use one of the base templates, and set bg/fg/select colors."""
-    if lightbg:
+    colors = colors.lower()
+    if colors=='light':
         return default_light_style_template%get_colors(name)
+    elif colors=='dark':
+        return default_dark_style_template%get_colors(name)
+    elif colors=='nocolor':
+        return default_bw_style_sheet
     else:
-        return default_dark_style_template%get_colors(name)
  No newline at end of file
+        raise KeyError("No such color scheme: %s"%colors)