added --colors flag to ipythonqt

IPython/frontend/qt/console/ipython_widget.py

@@ -25,8 +25,9 b' from IPython.core.inputsplitter import IPythonInputSplitter, \\'
 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
@@ -329,21 +330,24 b' class IPythonWidget(FrontendWidget):'
     # '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

IPython/frontend/qt/console/ipythonqt.py

@@ -150,13 +150,13 b' def main():'
     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()
 
@@ -197,20 +197,32 b' def main():'
 
     # 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

IPython/frontend/qt/console/styles.py

@@ -43,6 +43,17 b' 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('#'):
@@ -76,7 +87,8 b' def dark_style(stylename):'
     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):
@@ -94,9 +106,14 b' def get_colors(stylename):'
         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)