Use dialog instead of main window. Set console stylesheet based on pygments style. Don't block if there is a lot of output

src/calibre/utils/pyconsole/__init__.py

@@ -8,6 +8,15 @@ __docformat__ = 'restructuredtext en'
 import sys
 
 from calibre import prints as prints_
+from calibre.utils.config import Config, StringConfig
+
+
+def console_config(defaults=None):
+    desc=_('Settings to control the calibre content server')
+    c = Config('console', desc) if defaults is None else StringConfig(defaults, desc)
+
+    c.add_opt('--theme', default='default', help='The color theme')
+
 
 def prints(*args, **kwargs):
     kwargs['file'] = sys.__stdout__

src/calibre/utils/pyconsole/console.py

@@ -5,9 +5,10 @@ __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
 __docformat__ = 'restructuredtext en'
 
-import sys, textwrap
+import sys, textwrap, traceback, StringIO
 
-from PyQt4.Qt import QTextEdit, Qt, QTextFrameFormat
+from PyQt4.Qt import QTextEdit, Qt, QTextFrameFormat, pyqtSignal, \
+    QCoreApplication
 
 from pygments.lexers import PythonLexer, PythonTracebackLexer
 
@@ -15,6 +16,7 @@ from calibre.constants import __appname__, __version__
 from calibre.utils.pyconsole.formatter import Formatter
 from calibre.utils.pyconsole.repl import Interpreter, DummyFile
 from calibre.utils.pyconsole import prints
+from calibre.gui2 import error_dialog
 
 class EditBlock(object): # {{{
 
@@ -29,8 +31,27 @@ class EditBlock(object): # {{{
         self.cursor.endEditBlock()
 # }}}
 
+class Prepender(object): # {{{
+    'Helper class to insert output before the current prompt'
+    def __init__(self, console):
+        self.console = console
+
+    def __enter__(self):
+        c = self.console
+        self.opos = c.cursor_pos
+        cur = c.prompt_frame.firstCursorPosition()
+        cur.movePosition(cur.PreviousCharacter)
+        c.setTextCursor(cur)
+
+    def __exit__(self, *args):
+        self.console.cursor_pos = self.opos
+# }}}
+
 class Console(QTextEdit):
 
+    running = pyqtSignal()
+    running_done = pyqtSignal()
+
     @property
     def doc(self):
         return self.document()
@@ -43,6 +64,23 @@ class Console(QTextEdit):
     def root_frame(self):
         return self.doc.rootFrame()
 
+    def unhandled_exception(self, type, value, tb):
+        if type == KeyboardInterrupt:
+            return
+        try:
+            sio = StringIO.StringIO()
+            traceback.print_exception(type, value, tb, file=sio)
+            fe = sio.getvalue()
+            prints(fe)
+            try:
+                val = unicode(value)
+            except:
+                val = repr(value)
+            msg = '<b>%s</b>:'%type.__name__ + val
+            error_dialog(self, _('ERROR: Unhandled exception'), msg,
+                    det_msg=fe, show=True)
+        except BaseException:
+            pass
 
     def __init__(self,
             prompt='>>> ',
@@ -60,7 +98,17 @@ class Console(QTextEdit):
         self.doc.setMaximumBlockCount(10000)
         self.lexer = PythonLexer(ensurenl=False)
         self.tb_lexer = PythonTracebackLexer()
-        self.formatter = Formatter(prompt, continuation)
+        self.formatter = Formatter(prompt, continuation, style='default')
+        self.setStyleSheet(self.formatter.stylesheet)
+
+        self.key_dispatcher = { # {{{
+                Qt.Key_Enter : self.enter_pressed,
+                Qt.Key_Return : self.enter_pressed,
+                Qt.Key_Home : self.home_pressed,
+                Qt.Key_End : self.end_pressed,
+                Qt.Key_Left : self.left_pressed,
+                Qt.Key_Right : self.right_pressed,
+        } # }}}
 
         motd = textwrap.dedent('''\
         # Python {0}
@@ -76,6 +124,8 @@ class Console(QTextEdit):
         self.interpreter = Interpreter(parent=self)
         self.interpreter.show_error.connect(self.show_error)
 
+        sys.excepthook = self.unhandled_exception
+
 
     # Prompt management {{{
 
@@ -162,6 +212,8 @@ class Console(QTextEdit):
         if row > -1 and restore_cursor:
             self.cursor_pos = (row, col)
 
+        self.ensureCursorVisible()
+
     # }}}
 
     # Non-prompt Rendering {{{
@@ -185,16 +237,26 @@ class Console(QTextEdit):
                 self.formatter.render(self.tb_lexer.get_tokens(tb), self.cursor)
         except:
             prints(tb, end='')
+        self.ensureCursorVisible()
+        QCoreApplication.processEvents()
 
     def show_output(self, raw):
+        def do_show():
+            try:
+                self.buf.append(raw)
+                self.formatter.render_raw(raw, self.cursor)
+            except:
+                import traceback
+                prints(traceback.format_exc())
+                prints(raw, end='')
+
         if self.prompt_frame is not None:
-            # At a prompt, so redirect output
-            return prints(raw, end='')
-        try:
-            self.buf.append(raw)
-            self.formatter.render_raw(raw, self.cursor)
-        except:
-            prints(raw, end='')
+            with Prepender(self):
+                do_show()
+        else:
+            do_show()
+        self.ensureCursorVisible()
+        QCoreApplication.processEvents()
 
     # }}}
 
@@ -203,16 +265,11 @@ class Console(QTextEdit):
     def keyPressEvent(self, ev):
         text = unicode(ev.text())
         key = ev.key()
-        if key in (Qt.Key_Enter, Qt.Key_Return):
-            self.enter_pressed()
-        elif key == Qt.Key_Home:
-             self.home_pressed()
-        elif key == Qt.Key_End:
-            self.end_pressed()
-        elif key == Qt.Key_Left:
-            self.left_pressed()
-        elif key == Qt.Key_Right:
-            self.right_pressed()
+        action = self.key_dispatcher.get(key, None)
+        if callable(action):
+            action()
+        elif key in (Qt.Key_Escape,):
+            QTextEdit.keyPressEvent(self, ev)
         elif text:
             self.text_typed(text)
         else:
@@ -230,6 +287,7 @@ class Console(QTextEdit):
             c.movePosition(c.Up)
             c.movePosition(c.EndOfLine)
             self.setTextCursor(c)
+        self.ensureCursorVisible()
 
     def right_pressed(self):
         lineno, pos = self.cursor_pos
@@ -242,6 +300,7 @@ class Console(QTextEdit):
         elif lineno < len(cp)-1:
             c.movePosition(c.NextCharacter, n=1+self.prompt_len)
         self.setTextCursor(c)
+        self.ensureCursorVisible()
 
     def home_pressed(self):
         if self.prompt_frame is not None:
@@ -249,12 +308,14 @@ class Console(QTextEdit):
             c.movePosition(c.StartOfLine)
             c.movePosition(c.NextCharacter, n=self.prompt_len)
             self.setTextCursor(c)
+            self.ensureCursorVisible()
 
     def end_pressed(self):
         if self.prompt_frame is not None:
             c = self.cursor
             c.movePosition(c.EndOfLine)
             self.setTextCursor(c)
+            self.ensureCursorVisible()
 
     def enter_pressed(self):
         if self.prompt_frame is None:
@@ -267,7 +328,13 @@ class Console(QTextEdit):
             self.prompt_frame = None
             oldbuf = self.buf
             self.buf = []
-            ret = self.interpreter.runsource('\n'.join(cp))
+            self.running.emit()
+            try:
+                ret = self.interpreter.runsource('\n'.join(cp))
+            except SystemExit:
+                ret = False
+                self.show_output('Raising SystemExit not allowed\n')
+            self.running_done.emit()
             if ret: # Incomplete command
                 self.buf = oldbuf
                 self.prompt_frame = old_pf
@@ -275,7 +342,13 @@ class Console(QTextEdit):
                 c.insertBlock()
                 self.setTextCursor(c)
             else: # Command completed
-                old_pf.setFrameFormat(QTextFrameFormat())
+                try:
+                    old_pf.setFrameFormat(QTextFrameFormat())
+                except RuntimeError:
+                    # Happens if enough lines of output that the old
+                    # frame was deleted
+                    pass
+
             self.render_current_prompt()
 
     def text_typed(self, text):

src/calibre/utils/pyconsole/formatter.py

@@ -8,7 +8,7 @@ __docformat__ = 'restructuredtext en'
 from PyQt4.Qt import QTextCharFormat, QFont, QBrush, QColor
 
 from pygments.formatter import Formatter as PF
-from pygments.token import Token
+from pygments.token import Token, Generic
 
 class Formatter(object):
 
@@ -22,11 +22,16 @@ class Formatter(object):
         pf = PF(**options)
         self.styles = {}
         self.normal = self.base_fmt()
+        self.background_color = pf.style.background_color
+        self.color = 'black'
+
         for ttype, ndef in pf.style:
             fmt = self.base_fmt()
             if ndef['color']:
                 fmt.setForeground(QBrush(QColor('#%s'%ndef['color'])))
                 fmt.setUnderlineColor(QColor('#%s'%ndef['color']))
+                if ttype == Generic.Output:
+                    self.color = '#%s'%ndef['color']
             if ndef['bold']:
                 fmt.setFontWeight(QFont.Bold)
             if ndef['italic']:
@@ -40,6 +45,11 @@ class Formatter(object):
 
             self.styles[ttype] = fmt
 
+        self.stylesheet = '''
+        QTextEdit { color: %s; background-color: %s }
+        '''%(self.color, self.background_color)
+
+
     def base_fmt(self):
         fmt = QTextCharFormat()
         fmt.setFontFamily('monospace')
@@ -74,7 +84,7 @@ class Formatter(object):
 
     def render_prompt(self, is_continuation, cursor):
         pr = self.continuation if is_continuation else self.prompt
-        fmt = self.styles[Token.Generic.Subheading]
+        fmt = self.styles[Generic.Prompt]
         cursor.insertText(pr, fmt)
 
 

src/calibre/utils/pyconsole/main.py

@@ -6,19 +6,31 @@ __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
 __docformat__ = 'restructuredtext en'
 __version__   = '0.1.0'
 
-from PyQt4.Qt import QMainWindow, QToolBar, QStatusBar, QLabel, QFont, Qt, \
-    QApplication
+from functools import partial
+
+from PyQt4.Qt import QDialog, QToolBar, QStatusBar, QLabel, QFont, Qt, \
+    QApplication, QIcon, QVBoxLayout
 
 from calibre.constants import __appname__, __version__
 from calibre.utils.pyconsole.console import Console
 
-class MainWindow(QMainWindow):
+class MainWindow(QDialog):
 
-    def __init__(self, default_status_msg):
+    def __init__(self,
+            default_status_msg=_('Welcome to') + ' ' + __appname__+' console',
+            parent=None):
 
-        QMainWindow.__init__(self)
+        QDialog.__init__(self, parent)
+        self.l = QVBoxLayout()
+        self.setLayout(self.l)
 
-        self.resize(600, 700)
+        self.resize(800, 600)
+
+        # Setup tool bar {{{
+        self.tool_bar = QToolBar(self)
+        self.tool_bar.setToolButtonStyle(Qt.ToolButtonTextOnly)
+        self.l.addWidget(self.tool_bar)
+        # }}}
 
         # Setup status bar {{{
         self.status_bar = QStatusBar(self)
@@ -28,25 +40,23 @@ class MainWindow(QMainWindow):
         self.status_bar._font.setBold(True)
         self.status_bar.defmsg.setFont(self.status_bar._font)
         self.status_bar.addWidget(self.status_bar.defmsg)
-        self.setStatusBar(self.status_bar)
         # }}}
 
-        # Setup tool bar {{{
-        self.tool_bar = QToolBar(self)
-        self.addToolBar(Qt.BottomToolBarArea, self.tool_bar)
-        self.tool_bar.setToolButtonStyle(Qt.ToolButtonTextOnly)
-        # }}}
-
-        self.editor = Console(parent=self)
-        self.setCentralWidget(self.editor)
-
+        self.console = Console(parent=self)
+        self.console.running.connect(partial(self.status_bar.showMessage,
+            _('Code is running')))
+        self.console.running_done.connect(self.status_bar.clearMessage)
+        self.l.addWidget(self.console)
+        self.l.addWidget(self.status_bar)
+        self.setWindowTitle(__appname__ + ' console')
+        self.setWindowIcon(QIcon(I('console.png')))
 
 
 def main():
     QApplication.setApplicationName(__appname__+' console')
     QApplication.setOrganizationName('Kovid Goyal')
     app = QApplication([])
-    m = MainWindow(_('Welcome to') + ' ' + __appname__+' console')
+    m = MainWindow()
     m.show()
     app.exec_()