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# Standard library imports
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from os.path import commonprefix
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import re
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import sys
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from textwrap import dedent
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# System library imports
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from PyQt4 import QtCore, QtGui
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# Local imports
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from IPython.config.configurable import Configurable
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from IPython.frontend.qt.util import MetaQObjectHasTraits
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from IPython.utils.traitlets import Bool, Enum, Int
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from ansi_code_processor import QtAnsiCodeProcessor
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from completion_widget import CompletionWidget
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class ConsoleWidget(Configurable, QtGui.QWidget):
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""" An abstract base class for console-type widgets. This class has
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functionality for:
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* Maintaining a prompt and editing region
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* Providing the traditional Unix-style console keyboard shortcuts
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* Performing tab completion
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* Paging text
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* Handling ANSI escape codes
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ConsoleWidget also provides a number of utility methods that will be
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convenient to implementors of a console-style widget.
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"""
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__metaclass__ = MetaQObjectHasTraits
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# Whether to process ANSI escape codes.
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ansi_codes = Bool(True, config=True)
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# The maximum number of lines of text before truncation. Specifying a
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# non-positive number disables text truncation (not recommended).
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buffer_size = Int(500, config=True)
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# Whether to use a list widget or plain text output for tab completion.
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gui_completion = Bool(False, config=True)
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# The type of underlying text widget to use. Valid values are 'plain', which
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# specifies a QPlainTextEdit, and 'rich', which specifies a QTextEdit.
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# NOTE: this value can only be specified during initialization.
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kind = Enum(['plain', 'rich'], default_value='plain', config=True)
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# The type of paging to use. Valid values are:
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# 'inside' : The widget pages like a traditional terminal pager.
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# 'hsplit' : When paging is requested, the widget is split
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# horizontally. The top pane contains the console, and the
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# bottom pane contains the paged text.
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# 'vsplit' : Similar to 'hsplit', except that a vertical splitter used.
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# 'custom' : No action is taken by the widget beyond emitting a
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# 'custom_page_requested(str)' signal.
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# 'none' : The text is written directly to the console.
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# NOTE: this value can only be specified during initialization.
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paging = Enum(['inside', 'hsplit', 'vsplit', 'custom', 'none'],
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default_value='inside', config=True)
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# Whether to override ShortcutEvents for the keybindings defined by this
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# widget (Ctrl+n, Ctrl+a, etc). Enable this if you want this widget to take
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# priority (when it has focus) over, e.g., window-level menu shortcuts.
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override_shortcuts = Bool(False)
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# Signals that indicate ConsoleWidget state.
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copy_available = QtCore.pyqtSignal(bool)
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redo_available = QtCore.pyqtSignal(bool)
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undo_available = QtCore.pyqtSignal(bool)
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# Signal emitted when paging is needed and the paging style has been
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# specified as 'custom'.
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custom_page_requested = QtCore.pyqtSignal(object)
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# Protected class variables.
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_ctrl_down_remap = { QtCore.Qt.Key_B : QtCore.Qt.Key_Left,
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QtCore.Qt.Key_F : QtCore.Qt.Key_Right,
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QtCore.Qt.Key_A : QtCore.Qt.Key_Home,
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QtCore.Qt.Key_E : QtCore.Qt.Key_End,
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QtCore.Qt.Key_P : QtCore.Qt.Key_Up,
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QtCore.Qt.Key_N : QtCore.Qt.Key_Down,
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QtCore.Qt.Key_D : QtCore.Qt.Key_Delete, }
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_shortcuts = set(_ctrl_down_remap.keys() +
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[ QtCore.Qt.Key_C, QtCore.Qt.Key_G, QtCore.Qt.Key_O,
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QtCore.Qt.Key_V ])
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#---------------------------------------------------------------------------
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# 'QObject' interface
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#---------------------------------------------------------------------------
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def __init__(self, parent=None, **kw):
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""" Create a ConsoleWidget.
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Parameters:
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-----------
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parent : QWidget, optional [default None]
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The parent for this widget.
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"""
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QtGui.QWidget.__init__(self, parent)
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Configurable.__init__(self, **kw)
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# Create the layout and underlying text widget.
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layout = QtGui.QStackedLayout(self)
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layout.setContentsMargins(0, 0, 0, 0)
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self._control = self._create_control()
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self._page_control = None
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self._splitter = None
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if self.paging in ('hsplit', 'vsplit'):
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self._splitter = QtGui.QSplitter()
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if self.paging == 'hsplit':
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self._splitter.setOrientation(QtCore.Qt.Horizontal)
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else:
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self._splitter.setOrientation(QtCore.Qt.Vertical)
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self._splitter.addWidget(self._control)
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layout.addWidget(self._splitter)
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else:
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layout.addWidget(self._control)
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# Create the paging widget, if necessary.
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if self.paging in ('inside', 'hsplit', 'vsplit'):
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self._page_control = self._create_page_control()
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if self._splitter:
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self._page_control.hide()
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self._splitter.addWidget(self._page_control)
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else:
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layout.addWidget(self._page_control)
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# Initialize protected variables. Some variables contain useful state
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# information for subclasses; they should be considered read-only.
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self._ansi_processor = QtAnsiCodeProcessor()
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self._completion_widget = CompletionWidget(self._control)
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self._continuation_prompt = '> '
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self._continuation_prompt_html = None
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self._executing = False
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self._prompt = ''
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self._prompt_html = None
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self._prompt_pos = 0
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self._prompt_sep = ''
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self._reading = False
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self._reading_callback = None
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self._tab_width = 8
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self._text_completing_pos = 0
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# Set a monospaced font.
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self.reset_font()
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def eventFilter(self, obj, event):
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""" Reimplemented to ensure a console-like behavior in the underlying
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text widgets.
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"""
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etype = event.type()
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if etype == QtCore.QEvent.KeyPress:
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# Re-map keys for all filtered widgets.
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key = event.key()
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if self._control_key_down(event.modifiers()) and \
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key in self._ctrl_down_remap:
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new_event = QtGui.QKeyEvent(QtCore.QEvent.KeyPress,
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self._ctrl_down_remap[key],
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QtCore.Qt.NoModifier)
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QtGui.qApp.sendEvent(obj, new_event)
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return True
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elif obj == self._control:
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return self._event_filter_console_keypress(event)
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elif obj == self._page_control:
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return self._event_filter_page_keypress(event)
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# Make middle-click paste safe.
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elif etype == QtCore.QEvent.MouseButtonRelease and \
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event.button() == QtCore.Qt.MidButton and \
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obj == self._control.viewport():
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cursor = self._control.cursorForPosition(event.pos())
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self._control.setTextCursor(cursor)
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self.paste(QtGui.QClipboard.Selection)
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return True
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# Override shortcuts for all filtered widgets.
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elif etype == QtCore.QEvent.ShortcutOverride and \
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self.override_shortcuts and \
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self._control_key_down(event.modifiers()) and \
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event.key() in self._shortcuts:
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event.accept()
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return False
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# Prevent text from being moved by drag and drop.
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elif etype in (QtCore.QEvent.DragEnter, QtCore.QEvent.DragLeave,
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QtCore.QEvent.DragMove, QtCore.QEvent.Drop):
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return True
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return super(ConsoleWidget, self).eventFilter(obj, event)
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#---------------------------------------------------------------------------
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# 'QWidget' interface
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#---------------------------------------------------------------------------
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def sizeHint(self):
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""" Reimplemented to suggest a size that is 80 characters wide and
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25 lines high.
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"""
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font_metrics = QtGui.QFontMetrics(self.font)
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margin = (self._control.frameWidth() +
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self._control.document().documentMargin()) * 2
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style = self.style()
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splitwidth = style.pixelMetric(QtGui.QStyle.PM_SplitterWidth)
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# Note 1: Despite my best efforts to take the various margins into
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# account, the width is still coming out a bit too small, so we include
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# a fudge factor of one character here.
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# Note 2: QFontMetrics.maxWidth is not used here or anywhere else due
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# to a Qt bug on certain Mac OS systems where it returns 0.
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width = font_metrics.width(' ') * 81 + margin
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width += style.pixelMetric(QtGui.QStyle.PM_ScrollBarExtent)
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if self.paging == 'hsplit':
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width = width * 2 + splitwidth
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height = font_metrics.height() * 25 + margin
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if self.paging == 'vsplit':
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height = height * 2 + splitwidth
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return QtCore.QSize(width, height)
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#---------------------------------------------------------------------------
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# 'ConsoleWidget' public interface
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#---------------------------------------------------------------------------
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def can_paste(self):
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""" Returns whether text can be pasted from the clipboard.
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"""
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# Only accept text that can be ASCII encoded.
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if self._control.textInteractionFlags() & QtCore.Qt.TextEditable:
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text = QtGui.QApplication.clipboard().text()
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if not text.isEmpty():
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try:
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str(text)
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return True
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except UnicodeEncodeError:
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pass
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return False
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def clear(self, keep_input=True):
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""" Clear the console, then write a new prompt. If 'keep_input' is set,
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restores the old input buffer when the new prompt is written.
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"""
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if keep_input:
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input_buffer = self.input_buffer
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self._control.clear()
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self._show_prompt()
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if keep_input:
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self.input_buffer = input_buffer
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def copy(self):
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""" Copy the currently selected text to the clipboard.
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"""
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self._control.copy()
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def execute(self, source=None, hidden=False, interactive=False):
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""" Executes source or the input buffer, possibly prompting for more
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input.
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Parameters:
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-----------
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source : str, optional
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The source to execute. If not specified, the input buffer will be
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used. If specified and 'hidden' is False, the input buffer will be
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replaced with the source before execution.
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hidden : bool, optional (default False)
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If set, no output will be shown and the prompt will not be modified.
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In other words, it will be completely invisible to the user that
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an execution has occurred.
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interactive : bool, optional (default False)
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Whether the console is to treat the source as having been manually
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entered by the user. The effect of this parameter depends on the
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subclass implementation.
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Raises:
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-------
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RuntimeError
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If incomplete input is given and 'hidden' is True. In this case,
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it is not possible to prompt for more input.
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Returns:
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--------
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A boolean indicating whether the source was executed.
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"""
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# WARNING: The order in which things happen here is very particular, in
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# large part because our syntax highlighting is fragile. If you change
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# something, test carefully!
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# Decide what to execute.
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if source is None:
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source = self.input_buffer
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if not hidden:
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# A newline is appended later, but it should be considered part
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# of the input buffer.
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source += '\n'
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elif not hidden:
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self.input_buffer = source
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# Execute the source or show a continuation prompt if it is incomplete.
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complete = self._is_complete(source, interactive)
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if hidden:
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if complete:
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self._execute(source, hidden)
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else:
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error = 'Incomplete noninteractive input: "%s"'
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raise RuntimeError(error % source)
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else:
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if complete:
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self._append_plain_text('\n')
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self._executing_input_buffer = self.input_buffer
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self._executing = True
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self._prompt_finished()
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# The maximum block count is only in effect during execution.
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# This ensures that _prompt_pos does not become invalid due to
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# text truncation.
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self._control.document().setMaximumBlockCount(self.buffer_size)
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# Setting a positive maximum block count will automatically
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# disable the undo/redo history, but just to be safe:
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self._control.setUndoRedoEnabled(False)
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self._execute(source, hidden)
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else:
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# Do this inside an edit block so continuation prompts are
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# removed seamlessly via undo/redo.
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cursor = self._get_end_cursor()
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cursor.beginEditBlock()
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cursor.insertText('\n')
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self._insert_continuation_prompt(cursor)
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cursor.endEditBlock()
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# Do not do this inside the edit block. It works as expected
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# when using a QPlainTextEdit control, but does not have an
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# effect when using a QTextEdit. I believe this is a Qt bug.
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self._control.moveCursor(QtGui.QTextCursor.End)
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return complete
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def _get_input_buffer(self):
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""" The text that the user has entered entered at the current prompt.
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"""
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# If we're executing, the input buffer may not even exist anymore due to
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# the limit imposed by 'buffer_size'. Therefore, we store it.
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if self._executing:
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return self._executing_input_buffer
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cursor = self._get_end_cursor()
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cursor.setPosition(self._prompt_pos, QtGui.QTextCursor.KeepAnchor)
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input_buffer = str(cursor.selection().toPlainText())
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# Strip out continuation prompts.
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return input_buffer.replace('\n' + self._continuation_prompt, '\n')
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def _set_input_buffer(self, string):
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""" Replaces the text in the input buffer with 'string'.
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"""
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# For now, it is an error to modify the input buffer during execution.
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if self._executing:
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raise RuntimeError("Cannot change input buffer during execution.")
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# Remove old text.
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cursor = self._get_end_cursor()
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cursor.beginEditBlock()
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cursor.setPosition(self._prompt_pos, QtGui.QTextCursor.KeepAnchor)
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cursor.removeSelectedText()
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# Insert new text with continuation prompts.
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lines = string.splitlines(True)
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if lines:
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self._append_plain_text(lines[0])
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for i in xrange(1, len(lines)):
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if self._continuation_prompt_html is None:
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self._append_plain_text(self._continuation_prompt)
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else:
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self._append_html(self._continuation_prompt_html)
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self._append_plain_text(lines[i])
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cursor.endEditBlock()
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self._control.moveCursor(QtGui.QTextCursor.End)
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input_buffer = property(_get_input_buffer, _set_input_buffer)
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def _get_font(self):
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""" The base font being used by the ConsoleWidget.
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"""
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return self._control.document().defaultFont()
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def _set_font(self, font):
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""" Sets the base font for the ConsoleWidget to the specified QFont.
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"""
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font_metrics = QtGui.QFontMetrics(font)
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self._control.setTabStopWidth(self.tab_width * font_metrics.width(' '))
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self._completion_widget.setFont(font)
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self._control.document().setDefaultFont(font)
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if self._page_control:
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self._page_control.document().setDefaultFont(font)
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font = property(_get_font, _set_font)
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def paste(self, mode=QtGui.QClipboard.Clipboard):
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""" Paste the contents of the clipboard into the input region.
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Parameters:
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-----------
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mode : QClipboard::Mode, optional [default QClipboard::Clipboard]
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Controls which part of the system clipboard is used. This can be
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used to access the selection clipboard in X11 and the Find buffer
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in Mac OS. By default, the regular clipboard is used.
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"""
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if self._control.textInteractionFlags() & QtCore.Qt.TextEditable:
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try:
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# Remove any trailing newline, which confuses the GUI and
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# forces the user to backspace.
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text = str(QtGui.QApplication.clipboard().text(mode)).rstrip()
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except UnicodeEncodeError:
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pass
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else:
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self._insert_plain_text_into_buffer(dedent(text))
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def print_(self, printer):
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|
|
""" Print the contents of the ConsoleWidget to the specified QPrinter.
|
|
|
"""
|
|
|
self._control.print_(printer)
|
|
|
|
|
|
def redo(self):
|
|
|
""" Redo the last operation. If there is no operation to redo, nothing
|
|
|
happens.
|
|
|
"""
|
|
|
self._control.redo()
|
|
|
|
|
|
def reset_font(self):
|
|
|
""" Sets the font to the default fixed-width font for this platform.
|
|
|
"""
|
|
|
font = QtGui.QFont()
|
|
|
if sys.platform == 'win32':
|
|
|
# Prefer Consolas, but fall back to Courier if necessary.
|
|
|
font.setFamily('Consolas')
|
|
|
if not font.exactMatch():
|
|
|
font.setFamily('Courier')
|
|
|
elif sys.platform == 'darwin':
|
|
|
font.setFamily('Monaco')
|
|
|
else:
|
|
|
font.setFamily('Monospace')
|
|
|
font.setPointSize(QtGui.qApp.font().pointSize())
|
|
|
font.setStyleHint(QtGui.QFont.TypeWriter)
|
|
|
self._set_font(font)
|
|
|
|
|
|
def select_all(self):
|
|
|
""" Selects all the text in the buffer.
|
|
|
"""
|
|
|
self._control.selectAll()
|
|
|
|
|
|
def _get_tab_width(self):
|
|
|
""" The width (in terms of space characters) for tab characters.
|
|
|
"""
|
|
|
return self._tab_width
|
|
|
|
|
|
def _set_tab_width(self, tab_width):
|
|
|
""" Sets the width (in terms of space characters) for tab characters.
|
|
|
"""
|
|
|
font_metrics = QtGui.QFontMetrics(self.font)
|
|
|
self._control.setTabStopWidth(tab_width * font_metrics.width(' '))
|
|
|
|
|
|
self._tab_width = tab_width
|
|
|
|
|
|
tab_width = property(_get_tab_width, _set_tab_width)
|
|
|
|
|
|
def undo(self):
|
|
|
""" Undo the last operation. If there is no operation to undo, nothing
|
|
|
happens.
|
|
|
"""
|
|
|
self._control.undo()
|
|
|
|
|
|
#---------------------------------------------------------------------------
|
|
|
# 'ConsoleWidget' abstract interface
|
|
|
#---------------------------------------------------------------------------
|
|
|
|
|
|
def _is_complete(self, source, interactive):
|
|
|
""" Returns whether 'source' can be executed. When triggered by an
|
|
|
Enter/Return key press, 'interactive' is True; otherwise, it is
|
|
|
False.
|
|
|
"""
|
|
|
raise NotImplementedError
|
|
|
|
|
|
def _execute(self, source, hidden):
|
|
|
""" Execute 'source'. If 'hidden', do not show any output.
|
|
|
"""
|
|
|
raise NotImplementedError
|
|
|
|
|
|
def _prompt_started_hook(self):
|
|
|
""" Called immediately after a new prompt is displayed.
|
|
|
"""
|
|
|
pass
|
|
|
|
|
|
def _prompt_finished_hook(self):
|
|
|
""" Called immediately after a prompt is finished, i.e. when some input
|
|
|
will be processed and a new prompt displayed.
|
|
|
"""
|
|
|
pass
|
|
|
|
|
|
def _up_pressed(self):
|
|
|
""" Called when the up key is pressed. Returns whether to continue
|
|
|
processing the event.
|
|
|
"""
|
|
|
return True
|
|
|
|
|
|
def _down_pressed(self):
|
|
|
""" Called when the down key is pressed. Returns whether to continue
|
|
|
processing the event.
|
|
|
"""
|
|
|
return True
|
|
|
|
|
|
def _tab_pressed(self):
|
|
|
""" Called when the tab key is pressed. Returns whether to continue
|
|
|
processing the event.
|
|
|
"""
|
|
|
return False
|
|
|
|
|
|
#--------------------------------------------------------------------------
|
|
|
# 'ConsoleWidget' protected interface
|
|
|
#--------------------------------------------------------------------------
|
|
|
|
|
|
def _append_html(self, html):
|
|
|
""" Appends html at the end of the console buffer.
|
|
|
"""
|
|
|
cursor = self._get_end_cursor()
|
|
|
self._insert_html(cursor, html)
|
|
|
|
|
|
def _append_html_fetching_plain_text(self, html):
|
|
|
""" Appends 'html', then returns the plain text version of it.
|
|
|
"""
|
|
|
cursor = self._get_end_cursor()
|
|
|
return self._insert_html_fetching_plain_text(cursor, html)
|
|
|
|
|
|
def _append_plain_text(self, text):
|
|
|
""" Appends plain text at the end of the console buffer, processing
|
|
|
ANSI codes if enabled.
|
|
|
"""
|
|
|
cursor = self._get_end_cursor()
|
|
|
self._insert_plain_text(cursor, text)
|
|
|
|
|
|
def _append_plain_text_keeping_prompt(self, text):
|
|
|
""" Writes 'text' after the current prompt, then restores the old prompt
|
|
|
with its old input buffer.
|
|
|
"""
|
|
|
input_buffer = self.input_buffer
|
|
|
self._append_plain_text('\n')
|
|
|
self._prompt_finished()
|
|
|
|
|
|
self._append_plain_text(text)
|
|
|
self._show_prompt()
|
|
|
self.input_buffer = input_buffer
|
|
|
|
|
|
def _cancel_text_completion(self):
|
|
|
""" If text completion is progress, cancel it.
|
|
|
"""
|
|
|
if self._text_completing_pos:
|
|
|
self._clear_temporary_buffer()
|
|
|
self._text_completing_pos = 0
|
|
|
|
|
|
def _clear_temporary_buffer(self):
|
|
|
""" Clears the "temporary text" buffer, i.e. all the text following
|
|
|
the prompt region.
|
|
|
"""
|
|
|
# Select and remove all text below the input buffer.
|
|
|
cursor = self._get_prompt_cursor()
|
|
|
prompt = self._continuation_prompt.lstrip()
|
|
|
while cursor.movePosition(QtGui.QTextCursor.NextBlock):
|
|
|
temp_cursor = QtGui.QTextCursor(cursor)
|
|
|
temp_cursor.select(QtGui.QTextCursor.BlockUnderCursor)
|
|
|
text = str(temp_cursor.selection().toPlainText()).lstrip()
|
|
|
if not text.startswith(prompt):
|
|
|
break
|
|
|
else:
|
|
|
# We've reached the end of the input buffer and no text follows.
|
|
|
return
|
|
|
cursor.movePosition(QtGui.QTextCursor.Left) # Grab the newline.
|
|
|
cursor.movePosition(QtGui.QTextCursor.End,
|
|
|
QtGui.QTextCursor.KeepAnchor)
|
|
|
cursor.removeSelectedText()
|
|
|
|
|
|
# After doing this, we have no choice but to clear the undo/redo
|
|
|
# history. Otherwise, the text is not "temporary" at all, because it
|
|
|
# can be recalled with undo/redo. Unfortunately, Qt does not expose
|
|
|
# fine-grained control to the undo/redo system.
|
|
|
if self._control.isUndoRedoEnabled():
|
|
|
self._control.setUndoRedoEnabled(False)
|
|
|
self._control.setUndoRedoEnabled(True)
|
|
|
|
|
|
def _complete_with_items(self, cursor, items):
|
|
|
""" Performs completion with 'items' at the specified cursor location.
|
|
|
"""
|
|
|
self._cancel_text_completion()
|
|
|
|
|
|
if len(items) == 1:
|
|
|
cursor.setPosition(self._control.textCursor().position(),
|
|
|
QtGui.QTextCursor.KeepAnchor)
|
|
|
cursor.insertText(items[0])
|
|
|
|
|
|
elif len(items) > 1:
|
|
|
current_pos = self._control.textCursor().position()
|
|
|
prefix = commonprefix(items)
|
|
|
if prefix:
|
|
|
cursor.setPosition(current_pos, QtGui.QTextCursor.KeepAnchor)
|
|
|
cursor.insertText(prefix)
|
|
|
current_pos = cursor.position()
|
|
|
|
|
|
if self.gui_completion:
|
|
|
cursor.movePosition(QtGui.QTextCursor.Left, n=len(prefix))
|
|
|
self._completion_widget.show_items(cursor, items)
|
|
|
else:
|
|
|
cursor.beginEditBlock()
|
|
|
self._append_plain_text('\n')
|
|
|
self._page(self._format_as_columns(items))
|
|
|
cursor.endEditBlock()
|
|
|
|
|
|
cursor.setPosition(current_pos)
|
|
|
self._control.moveCursor(QtGui.QTextCursor.End)
|
|
|
self._control.setTextCursor(cursor)
|
|
|
self._text_completing_pos = current_pos
|
|
|
|
|
|
def _control_key_down(self, modifiers, include_command=True):
|
|
|
""" Given a KeyboardModifiers flags object, return whether the Control
|
|
|
key is down.
|
|
|
|
|
|
Parameters:
|
|
|
-----------
|
|
|
include_command : bool, optional (default True)
|
|
|
Whether to treat the Command key as a (mutually exclusive) synonym
|
|
|
for Control when in Mac OS.
|
|
|
"""
|
|
|
# Note that on Mac OS, ControlModifier corresponds to the Command key
|
|
|
# while MetaModifier corresponds to the Control key.
|
|
|
if sys.platform == 'darwin':
|
|
|
down = include_command and (modifiers & QtCore.Qt.ControlModifier)
|
|
|
return bool(down) ^ bool(modifiers & QtCore.Qt.MetaModifier)
|
|
|
else:
|
|
|
return bool(modifiers & QtCore.Qt.ControlModifier)
|
|
|
|
|
|
def _create_control(self):
|
|
|
""" Creates and connects the underlying text widget.
|
|
|
"""
|
|
|
# Create the underlying control.
|
|
|
if self.kind == 'plain':
|
|
|
control = QtGui.QPlainTextEdit()
|
|
|
elif self.kind == 'rich':
|
|
|
control = QtGui.QTextEdit()
|
|
|
control.setAcceptRichText(False)
|
|
|
|
|
|
# Install event filters. The filter on the viewport is needed for
|
|
|
# mouse events and drag events.
|
|
|
control.installEventFilter(self)
|
|
|
control.viewport().installEventFilter(self)
|
|
|
|
|
|
# Connect signals.
|
|
|
control.cursorPositionChanged.connect(self._cursor_position_changed)
|
|
|
control.customContextMenuRequested.connect(self._show_context_menu)
|
|
|
control.copyAvailable.connect(self.copy_available)
|
|
|
control.redoAvailable.connect(self.redo_available)
|
|
|
control.undoAvailable.connect(self.undo_available)
|
|
|
|
|
|
# Configure the control.
|
|
|
control.setContextMenuPolicy(QtCore.Qt.CustomContextMenu)
|
|
|
control.setReadOnly(True)
|
|
|
control.setUndoRedoEnabled(False)
|
|
|
control.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOn)
|
|
|
return control
|
|
|
|
|
|
def _create_page_control(self):
|
|
|
""" Creates and connects the underlying paging widget.
|
|
|
"""
|
|
|
control = QtGui.QPlainTextEdit()
|
|
|
control.installEventFilter(self)
|
|
|
control.setReadOnly(True)
|
|
|
control.setUndoRedoEnabled(False)
|
|
|
control.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOn)
|
|
|
return control
|
|
|
|
|
|
def _event_filter_console_keypress(self, event):
|
|
|
""" Filter key events for the underlying text widget to create a
|
|
|
console-like interface.
|
|
|
"""
|
|
|
intercepted = False
|
|
|
cursor = self._control.textCursor()
|
|
|
position = cursor.position()
|
|
|
key = event.key()
|
|
|
ctrl_down = self._control_key_down(event.modifiers())
|
|
|
alt_down = event.modifiers() & QtCore.Qt.AltModifier
|
|
|
shift_down = event.modifiers() & QtCore.Qt.ShiftModifier
|
|
|
|
|
|
#------ Special sequences ----------------------------------------------
|
|
|
|
|
|
if event.matches(QtGui.QKeySequence.Copy):
|
|
|
self.copy()
|
|
|
intercepted = True
|
|
|
|
|
|
elif event.matches(QtGui.QKeySequence.Paste):
|
|
|
self.paste()
|
|
|
intercepted = True
|
|
|
|
|
|
#------ Special modifier logic -----------------------------------------
|
|
|
|
|
|
elif key in (QtCore.Qt.Key_Return, QtCore.Qt.Key_Enter):
|
|
|
intercepted = True
|
|
|
|
|
|
# Special handling when tab completing in text mode.
|
|
|
self._cancel_text_completion()
|
|
|
|
|
|
if self._in_buffer(position):
|
|
|
if self._reading:
|
|
|
self._append_plain_text('\n')
|
|
|
self._reading = False
|
|
|
if self._reading_callback:
|
|
|
self._reading_callback()
|
|
|
|
|
|
# If there is only whitespace after the cursor, execute.
|
|
|
# Otherwise, split the line with a continuation prompt.
|
|
|
elif not self._executing:
|
|
|
cursor.movePosition(QtGui.QTextCursor.End,
|
|
|
QtGui.QTextCursor.KeepAnchor)
|
|
|
at_end = cursor.selectedText().trimmed().isEmpty()
|
|
|
if (at_end or shift_down) and not ctrl_down:
|
|
|
self.execute(interactive = not shift_down)
|
|
|
else:
|
|
|
# Do this inside an edit block for clean undo/redo.
|
|
|
cursor.beginEditBlock()
|
|
|
cursor.setPosition(position)
|
|
|
cursor.insertText('\n')
|
|
|
self._insert_continuation_prompt(cursor)
|
|
|
cursor.endEditBlock()
|
|
|
|
|
|
# Ensure that the whole input buffer is visible.
|
|
|
# FIXME: This will not be usable if the input buffer is
|
|
|
# taller than the console widget.
|
|
|
self._control.moveCursor(QtGui.QTextCursor.End)
|
|
|
self._control.setTextCursor(cursor)
|
|
|
|
|
|
#------ Control/Cmd modifier -------------------------------------------
|
|
|
|
|
|
elif ctrl_down:
|
|
|
if key == QtCore.Qt.Key_G:
|
|
|
self._keyboard_quit()
|
|
|
intercepted = True
|
|
|
|
|
|
elif key == QtCore.Qt.Key_K:
|
|
|
if self._in_buffer(position):
|
|
|
cursor.movePosition(QtGui.QTextCursor.EndOfLine,
|
|
|
QtGui.QTextCursor.KeepAnchor)
|
|
|
if not cursor.hasSelection():
|
|
|
# Line deletion (remove continuation prompt)
|
|
|
cursor.movePosition(QtGui.QTextCursor.NextBlock,
|
|
|
QtGui.QTextCursor.KeepAnchor)
|
|
|
cursor.movePosition(QtGui.QTextCursor.Right,
|
|
|
QtGui.QTextCursor.KeepAnchor,
|
|
|
len(self._continuation_prompt))
|
|
|
cursor.removeSelectedText()
|
|
|
intercepted = True
|
|
|
|
|
|
elif key == QtCore.Qt.Key_L:
|
|
|
# It would be better to simply move the prompt block to the top
|
|
|
# of the control viewport. QPlainTextEdit has a private method
|
|
|
# to do this (setTopBlock), but it cannot be duplicated here
|
|
|
# because it requires access to the QTextControl that underlies
|
|
|
# both QPlainTextEdit and QTextEdit. In short, this can only be
|
|
|
# achieved by appending newlines after the prompt, which is a
|
|
|
# gigantic hack and likely to cause other problems.
|
|
|
self.clear()
|
|
|
intercepted = True
|
|
|
|
|
|
elif key == QtCore.Qt.Key_O:
|
|
|
if self._page_control and self._page_control.isVisible():
|
|
|
self._page_control.setFocus()
|
|
|
intercept = True
|
|
|
|
|
|
elif key == QtCore.Qt.Key_X:
|
|
|
# FIXME: Instead of disabling cut completely, only allow it
|
|
|
# when safe.
|
|
|
intercepted = True
|
|
|
|
|
|
elif key == QtCore.Qt.Key_Y:
|
|
|
self.paste()
|
|
|
intercepted = True
|
|
|
|
|
|
elif key in (QtCore.Qt.Key_Backspace, QtCore.Qt.Key_Delete):
|
|
|
intercepted = True
|
|
|
|
|
|
#------ Alt modifier ---------------------------------------------------
|
|
|
|
|
|
elif alt_down:
|
|
|
if key == QtCore.Qt.Key_B:
|
|
|
self._set_cursor(self._get_word_start_cursor(position))
|
|
|
intercepted = True
|
|
|
|
|
|
elif key == QtCore.Qt.Key_F:
|
|
|
self._set_cursor(self._get_word_end_cursor(position))
|
|
|
intercepted = True
|
|
|
|
|
|
elif key == QtCore.Qt.Key_Backspace:
|
|
|
cursor = self._get_word_start_cursor(position)
|
|
|
cursor.setPosition(position, QtGui.QTextCursor.KeepAnchor)
|
|
|
cursor.removeSelectedText()
|
|
|
intercepted = True
|
|
|
|
|
|
elif key == QtCore.Qt.Key_D:
|
|
|
cursor = self._get_word_end_cursor(position)
|
|
|
cursor.setPosition(position, QtGui.QTextCursor.KeepAnchor)
|
|
|
cursor.removeSelectedText()
|
|
|
intercepted = True
|
|
|
|
|
|
elif key == QtCore.Qt.Key_Delete:
|
|
|
intercepted = True
|
|
|
|
|
|
elif key == QtCore.Qt.Key_Greater:
|
|
|
self._control.moveCursor(QtGui.QTextCursor.End)
|
|
|
intercepted = True
|
|
|
|
|
|
elif key == QtCore.Qt.Key_Less:
|
|
|
self._control.setTextCursor(self._get_prompt_cursor())
|
|
|
intercepted = True
|
|
|
|
|
|
#------ No modifiers ---------------------------------------------------
|
|
|
|
|
|
else:
|
|
|
if key == QtCore.Qt.Key_Escape:
|
|
|
self._keyboard_quit()
|
|
|
intercepted = True
|
|
|
|
|
|
elif key == QtCore.Qt.Key_Up:
|
|
|
if self._reading or not self._up_pressed():
|
|
|
intercepted = True
|
|
|
else:
|
|
|
prompt_line = self._get_prompt_cursor().blockNumber()
|
|
|
intercepted = cursor.blockNumber() <= prompt_line
|
|
|
|
|
|
elif key == QtCore.Qt.Key_Down:
|
|
|
if self._reading or not self._down_pressed():
|
|
|
intercepted = True
|
|
|
else:
|
|
|
end_line = self._get_end_cursor().blockNumber()
|
|
|
intercepted = cursor.blockNumber() == end_line
|
|
|
|
|
|
elif key == QtCore.Qt.Key_Tab:
|
|
|
if not self._reading:
|
|
|
intercepted = not self._tab_pressed()
|
|
|
|
|
|
elif key == QtCore.Qt.Key_Left:
|
|
|
intercepted = not self._in_buffer(position - 1)
|
|
|
|
|
|
elif key == QtCore.Qt.Key_Home:
|
|
|
start_line = cursor.blockNumber()
|
|
|
if start_line == self._get_prompt_cursor().blockNumber():
|
|
|
start_pos = self._prompt_pos
|
|
|
else:
|
|
|
cursor.movePosition(QtGui.QTextCursor.StartOfBlock,
|
|
|
QtGui.QTextCursor.KeepAnchor)
|
|
|
start_pos = cursor.position()
|
|
|
start_pos += len(self._continuation_prompt)
|
|
|
cursor.setPosition(position)
|
|
|
if shift_down and self._in_buffer(position):
|
|
|
cursor.setPosition(start_pos, QtGui.QTextCursor.KeepAnchor)
|
|
|
else:
|
|
|
cursor.setPosition(start_pos)
|
|
|
self._set_cursor(cursor)
|
|
|
intercepted = True
|
|
|
|
|
|
elif key == QtCore.Qt.Key_Backspace:
|
|
|
|
|
|
# Line deletion (remove continuation prompt)
|
|
|
line, col = cursor.blockNumber(), cursor.columnNumber()
|
|
|
if not self._reading and \
|
|
|
col == len(self._continuation_prompt) and \
|
|
|
line > self._get_prompt_cursor().blockNumber():
|
|
|
cursor.beginEditBlock()
|
|
|
cursor.movePosition(QtGui.QTextCursor.StartOfBlock,
|
|
|
QtGui.QTextCursor.KeepAnchor)
|
|
|
cursor.removeSelectedText()
|
|
|
cursor.deletePreviousChar()
|
|
|
cursor.endEditBlock()
|
|
|
intercepted = True
|
|
|
|
|
|
# Regular backwards deletion
|
|
|
else:
|
|
|
anchor = cursor.anchor()
|
|
|
if anchor == position:
|
|
|
intercepted = not self._in_buffer(position - 1)
|
|
|
else:
|
|
|
intercepted = not self._in_buffer(min(anchor, position))
|
|
|
|
|
|
elif key == QtCore.Qt.Key_Delete:
|
|
|
|
|
|
# Line deletion (remove continuation prompt)
|
|
|
if not self._reading and self._in_buffer(position) and \
|
|
|
cursor.atBlockEnd() and not cursor.hasSelection():
|
|
|
cursor.movePosition(QtGui.QTextCursor.NextBlock,
|
|
|
QtGui.QTextCursor.KeepAnchor)
|
|
|
cursor.movePosition(QtGui.QTextCursor.Right,
|
|
|
QtGui.QTextCursor.KeepAnchor,
|
|
|
len(self._continuation_prompt))
|
|
|
cursor.removeSelectedText()
|
|
|
intercepted = True
|
|
|
|
|
|
# Regular forwards deletion:
|
|
|
else:
|
|
|
anchor = cursor.anchor()
|
|
|
intercepted = (not self._in_buffer(anchor) or
|
|
|
not self._in_buffer(position))
|
|
|
|
|
|
# Don't move the cursor if control is down to allow copy-paste using
|
|
|
# the keyboard in any part of the buffer.
|
|
|
if not ctrl_down:
|
|
|
self._keep_cursor_in_buffer()
|
|
|
|
|
|
return intercepted
|
|
|
|
|
|
def _event_filter_page_keypress(self, event):
|
|
|
""" Filter key events for the paging widget to create console-like
|
|
|
interface.
|
|
|
"""
|
|
|
key = event.key()
|
|
|
ctrl_down = self._control_key_down(event.modifiers())
|
|
|
alt_down = event.modifiers() & QtCore.Qt.AltModifier
|
|
|
|
|
|
if ctrl_down:
|
|
|
if key == QtCore.Qt.Key_O:
|
|
|
self._control.setFocus()
|
|
|
intercept = True
|
|
|
|
|
|
elif alt_down:
|
|
|
if key == QtCore.Qt.Key_Greater:
|
|
|
self._page_control.moveCursor(QtGui.QTextCursor.End)
|
|
|
intercepted = True
|
|
|
|
|
|
elif key == QtCore.Qt.Key_Less:
|
|
|
self._page_control.moveCursor(QtGui.QTextCursor.Start)
|
|
|
intercepted = True
|
|
|
|
|
|
elif key in (QtCore.Qt.Key_Q, QtCore.Qt.Key_Escape):
|
|
|
if self._splitter:
|
|
|
self._page_control.hide()
|
|
|
else:
|
|
|
self.layout().setCurrentWidget(self._control)
|
|
|
return True
|
|
|
|
|
|
elif key in (QtCore.Qt.Key_Enter, QtCore.Qt.Key_Return):
|
|
|
new_event = QtGui.QKeyEvent(QtCore.QEvent.KeyPress,
|
|
|
QtCore.Qt.Key_PageDown,
|
|
|
QtCore.Qt.NoModifier)
|
|
|
QtGui.qApp.sendEvent(self._page_control, new_event)
|
|
|
return True
|
|
|
|
|
|
elif key == QtCore.Qt.Key_Backspace:
|
|
|
new_event = QtGui.QKeyEvent(QtCore.QEvent.KeyPress,
|
|
|
QtCore.Qt.Key_PageUp,
|
|
|
QtCore.Qt.NoModifier)
|
|
|
QtGui.qApp.sendEvent(self._page_control, new_event)
|
|
|
return True
|
|
|
|
|
|
return False
|
|
|
|
|
|
def _format_as_columns(self, items, separator=' '):
|
|
|
""" Transform a list of strings into a single string with columns.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
items : sequence of strings
|
|
|
The strings to process.
|
|
|
|
|
|
separator : str, optional [default is two spaces]
|
|
|
The string that separates columns.
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
The formatted string.
|
|
|
"""
|
|
|
# Note: this code is adapted from columnize 0.3.2.
|
|
|
# See http://code.google.com/p/pycolumnize/
|
|
|
|
|
|
# Calculate the number of characters available.
|
|
|
width = self._control.viewport().width()
|
|
|
char_width = QtGui.QFontMetrics(self.font).width(' ')
|
|
|
displaywidth = max(10, (width / char_width) - 1)
|
|
|
|
|
|
# Some degenerate cases.
|
|
|
size = len(items)
|
|
|
if size == 0:
|
|
|
return '\n'
|
|
|
elif size == 1:
|
|
|
return '%s\n' % str(items[0])
|
|
|
|
|
|
# Try every row count from 1 upwards
|
|
|
array_index = lambda nrows, row, col: nrows*col + row
|
|
|
for nrows in range(1, size):
|
|
|
ncols = (size + nrows - 1) // nrows
|
|
|
colwidths = []
|
|
|
totwidth = -len(separator)
|
|
|
for col in range(ncols):
|
|
|
# Get max column width for this column
|
|
|
colwidth = 0
|
|
|
for row in range(nrows):
|
|
|
i = array_index(nrows, row, col)
|
|
|
if i >= size: break
|
|
|
x = items[i]
|
|
|
colwidth = max(colwidth, len(x))
|
|
|
colwidths.append(colwidth)
|
|
|
totwidth += colwidth + len(separator)
|
|
|
if totwidth > displaywidth:
|
|
|
break
|
|
|
if totwidth <= displaywidth:
|
|
|
break
|
|
|
|
|
|
# The smallest number of rows computed and the max widths for each
|
|
|
# column has been obtained. Now we just have to format each of the rows.
|
|
|
string = ''
|
|
|
for row in range(nrows):
|
|
|
texts = []
|
|
|
for col in range(ncols):
|
|
|
i = row + nrows*col
|
|
|
if i >= size:
|
|
|
texts.append('')
|
|
|
else:
|
|
|
texts.append(items[i])
|
|
|
while texts and not texts[-1]:
|
|
|
del texts[-1]
|
|
|
for col in range(len(texts)):
|
|
|
texts[col] = texts[col].ljust(colwidths[col])
|
|
|
string += '%s\n' % str(separator.join(texts))
|
|
|
return string
|
|
|
|
|
|
def _get_block_plain_text(self, block):
|
|
|
""" Given a QTextBlock, return its unformatted text.
|
|
|
"""
|
|
|
cursor = QtGui.QTextCursor(block)
|
|
|
cursor.movePosition(QtGui.QTextCursor.StartOfBlock)
|
|
|
cursor.movePosition(QtGui.QTextCursor.EndOfBlock,
|
|
|
QtGui.QTextCursor.KeepAnchor)
|
|
|
return str(cursor.selection().toPlainText())
|
|
|
|
|
|
def _get_cursor(self):
|
|
|
""" Convenience method that returns a cursor for the current position.
|
|
|
"""
|
|
|
return self._control.textCursor()
|
|
|
|
|
|
def _get_end_cursor(self):
|
|
|
""" Convenience method that returns a cursor for the last character.
|
|
|
"""
|
|
|
cursor = self._control.textCursor()
|
|
|
cursor.movePosition(QtGui.QTextCursor.End)
|
|
|
return cursor
|
|
|
|
|
|
def _get_input_buffer_cursor_column(self):
|
|
|
""" Returns the column of the cursor in the input buffer, excluding the
|
|
|
contribution by the prompt, or -1 if there is no such column.
|
|
|
"""
|
|
|
prompt = self._get_input_buffer_cursor_prompt()
|
|
|
if prompt is None:
|
|
|
return -1
|
|
|
else:
|
|
|
cursor = self._control.textCursor()
|
|
|
return cursor.columnNumber() - len(prompt)
|
|
|
|
|
|
def _get_input_buffer_cursor_line(self):
|
|
|
""" Returns line of the input buffer that contains the cursor, or None
|
|
|
if there is no such line.
|
|
|
"""
|
|
|
prompt = self._get_input_buffer_cursor_prompt()
|
|
|
if prompt is None:
|
|
|
return None
|
|
|
else:
|
|
|
cursor = self._control.textCursor()
|
|
|
text = self._get_block_plain_text(cursor.block())
|
|
|
return text[len(prompt):]
|
|
|
|
|
|
def _get_input_buffer_cursor_prompt(self):
|
|
|
""" Returns the (plain text) prompt for line of the input buffer that
|
|
|
contains the cursor, or None if there is no such line.
|
|
|
"""
|
|
|
if self._executing:
|
|
|
return None
|
|
|
cursor = self._control.textCursor()
|
|
|
if cursor.position() >= self._prompt_pos:
|
|
|
if cursor.blockNumber() == self._get_prompt_cursor().blockNumber():
|
|
|
return self._prompt
|
|
|
else:
|
|
|
return self._continuation_prompt
|
|
|
else:
|
|
|
return None
|
|
|
|
|
|
def _get_prompt_cursor(self):
|
|
|
""" Convenience method that returns a cursor for the prompt position.
|
|
|
"""
|
|
|
cursor = self._control.textCursor()
|
|
|
cursor.setPosition(self._prompt_pos)
|
|
|
return cursor
|
|
|
|
|
|
def _get_selection_cursor(self, start, end):
|
|
|
""" Convenience method that returns a cursor with text selected between
|
|
|
the positions 'start' and 'end'.
|
|
|
"""
|
|
|
cursor = self._control.textCursor()
|
|
|
cursor.setPosition(start)
|
|
|
cursor.setPosition(end, QtGui.QTextCursor.KeepAnchor)
|
|
|
return cursor
|
|
|
|
|
|
def _get_word_start_cursor(self, position):
|
|
|
""" Find the start of the word to the left the given position. If a
|
|
|
sequence of non-word characters precedes the first word, skip over
|
|
|
them. (This emulates the behavior of bash, emacs, etc.)
|
|
|
"""
|
|
|
document = self._control.document()
|
|
|
position -= 1
|
|
|
while position >= self._prompt_pos and \
|
|
|
not document.characterAt(position).isLetterOrNumber():
|
|
|
position -= 1
|
|
|
while position >= self._prompt_pos and \
|
|
|
document.characterAt(position).isLetterOrNumber():
|
|
|
position -= 1
|
|
|
cursor = self._control.textCursor()
|
|
|
cursor.setPosition(position + 1)
|
|
|
return cursor
|
|
|
|
|
|
def _get_word_end_cursor(self, position):
|
|
|
""" Find the end of the word to the right the given position. If a
|
|
|
sequence of non-word characters precedes the first word, skip over
|
|
|
them. (This emulates the behavior of bash, emacs, etc.)
|
|
|
"""
|
|
|
document = self._control.document()
|
|
|
end = self._get_end_cursor().position()
|
|
|
while position < end and \
|
|
|
not document.characterAt(position).isLetterOrNumber():
|
|
|
position += 1
|
|
|
while position < end and \
|
|
|
document.characterAt(position).isLetterOrNumber():
|
|
|
position += 1
|
|
|
cursor = self._control.textCursor()
|
|
|
cursor.setPosition(position)
|
|
|
return cursor
|
|
|
|
|
|
def _insert_continuation_prompt(self, cursor):
|
|
|
""" Inserts new continuation prompt using the specified cursor.
|
|
|
"""
|
|
|
if self._continuation_prompt_html is None:
|
|
|
self._insert_plain_text(cursor, self._continuation_prompt)
|
|
|
else:
|
|
|
self._continuation_prompt = self._insert_html_fetching_plain_text(
|
|
|
cursor, self._continuation_prompt_html)
|
|
|
|
|
|
def _insert_html(self, cursor, html):
|
|
|
""" Inserts HTML using the specified cursor in such a way that future
|
|
|
formatting is unaffected.
|
|
|
"""
|
|
|
cursor.beginEditBlock()
|
|
|
cursor.insertHtml(html)
|
|
|
|
|
|
# After inserting HTML, the text document "remembers" it's in "html
|
|
|
# mode", which means that subsequent calls adding plain text will result
|
|
|
# in unwanted formatting, lost tab characters, etc. The following code
|
|
|
# hacks around this behavior, which I consider to be a bug in Qt, by
|
|
|
# (crudely) resetting the document's style state.
|
|
|
cursor.movePosition(QtGui.QTextCursor.Left,
|
|
|
QtGui.QTextCursor.KeepAnchor)
|
|
|
if cursor.selection().toPlainText() == ' ':
|
|
|
cursor.removeSelectedText()
|
|
|
else:
|
|
|
cursor.movePosition(QtGui.QTextCursor.Right)
|
|
|
cursor.insertText(' ', QtGui.QTextCharFormat())
|
|
|
cursor.endEditBlock()
|
|
|
|
|
|
def _insert_html_fetching_plain_text(self, cursor, html):
|
|
|
""" Inserts HTML using the specified cursor, then returns its plain text
|
|
|
version.
|
|
|
"""
|
|
|
cursor.beginEditBlock()
|
|
|
cursor.removeSelectedText()
|
|
|
|
|
|
start = cursor.position()
|
|
|
self._insert_html(cursor, html)
|
|
|
end = cursor.position()
|
|
|
cursor.setPosition(start, QtGui.QTextCursor.KeepAnchor)
|
|
|
text = str(cursor.selection().toPlainText())
|
|
|
|
|
|
cursor.setPosition(end)
|
|
|
cursor.endEditBlock()
|
|
|
return text
|
|
|
|
|
|
def _insert_plain_text(self, cursor, text):
|
|
|
""" Inserts plain text using the specified cursor, processing ANSI codes
|
|
|
if enabled.
|
|
|
"""
|
|
|
cursor.beginEditBlock()
|
|
|
if self.ansi_codes:
|
|
|
for substring in self._ansi_processor.split_string(text):
|
|
|
for action in self._ansi_processor.actions:
|
|
|
if action.kind == 'erase' and action.area == 'screen':
|
|
|
cursor.select(QtGui.QTextCursor.Document)
|
|
|
cursor.removeSelectedText()
|
|
|
format = self._ansi_processor.get_format()
|
|
|
cursor.insertText(substring, format)
|
|
|
else:
|
|
|
cursor.insertText(text)
|
|
|
cursor.endEditBlock()
|
|
|
|
|
|
def _insert_plain_text_into_buffer(self, text):
|
|
|
""" Inserts text into the input buffer at the current cursor position,
|
|
|
ensuring that continuation prompts are inserted as necessary.
|
|
|
"""
|
|
|
lines = str(text).splitlines(True)
|
|
|
if lines:
|
|
|
self._keep_cursor_in_buffer()
|
|
|
cursor = self._control.textCursor()
|
|
|
cursor.beginEditBlock()
|
|
|
cursor.insertText(lines[0])
|
|
|
for line in lines[1:]:
|
|
|
if self._continuation_prompt_html is None:
|
|
|
cursor.insertText(self._continuation_prompt)
|
|
|
else:
|
|
|
self._continuation_prompt = \
|
|
|
self._insert_html_fetching_plain_text(
|
|
|
cursor, self._continuation_prompt_html)
|
|
|
cursor.insertText(line)
|
|
|
cursor.endEditBlock()
|
|
|
self._control.setTextCursor(cursor)
|
|
|
|
|
|
def _in_buffer(self, position=None):
|
|
|
""" Returns whether the current cursor (or, if specified, a position) is
|
|
|
inside the editing region.
|
|
|
"""
|
|
|
cursor = self._control.textCursor()
|
|
|
if position is None:
|
|
|
position = cursor.position()
|
|
|
else:
|
|
|
cursor.setPosition(position)
|
|
|
line = cursor.blockNumber()
|
|
|
prompt_line = self._get_prompt_cursor().blockNumber()
|
|
|
if line == prompt_line:
|
|
|
return position >= self._prompt_pos
|
|
|
elif line > prompt_line:
|
|
|
cursor.movePosition(QtGui.QTextCursor.StartOfBlock)
|
|
|
prompt_pos = cursor.position() + len(self._continuation_prompt)
|
|
|
return position >= prompt_pos
|
|
|
return False
|
|
|
|
|
|
def _keep_cursor_in_buffer(self):
|
|
|
""" Ensures that the cursor is inside the editing region. Returns
|
|
|
whether the cursor was moved.
|
|
|
"""
|
|
|
moved = not self._in_buffer()
|
|
|
if moved:
|
|
|
cursor = self._control.textCursor()
|
|
|
cursor.movePosition(QtGui.QTextCursor.End)
|
|
|
self._control.setTextCursor(cursor)
|
|
|
return moved
|
|
|
|
|
|
def _keyboard_quit(self):
|
|
|
""" Cancels the current editing task ala Ctrl-G in Emacs.
|
|
|
"""
|
|
|
if self._text_completing_pos:
|
|
|
self._cancel_text_completion()
|
|
|
else:
|
|
|
self.input_buffer = ''
|
|
|
|
|
|
def _page(self, text):
|
|
|
""" Displays text using the pager if it exceeds the height of the
|
|
|
visible area.
|
|
|
"""
|
|
|
if self.paging == 'none':
|
|
|
self._append_plain_text(text)
|
|
|
else:
|
|
|
line_height = QtGui.QFontMetrics(self.font).height()
|
|
|
minlines = self._control.viewport().height() / line_height
|
|
|
if re.match("(?:[^\n]*\n){%i}" % minlines, text):
|
|
|
if self.paging == 'custom':
|
|
|
self.custom_page_requested.emit(text)
|
|
|
else:
|
|
|
self._page_control.clear()
|
|
|
cursor = self._page_control.textCursor()
|
|
|
self._insert_plain_text(cursor, text)
|
|
|
self._page_control.moveCursor(QtGui.QTextCursor.Start)
|
|
|
|
|
|
self._page_control.viewport().resize(self._control.size())
|
|
|
if self._splitter:
|
|
|
self._page_control.show()
|
|
|
self._page_control.setFocus()
|
|
|
else:
|
|
|
self.layout().setCurrentWidget(self._page_control)
|
|
|
else:
|
|
|
self._append_plain_text(text)
|
|
|
|
|
|
def _prompt_started(self):
|
|
|
""" Called immediately after a new prompt is displayed.
|
|
|
"""
|
|
|
# Temporarily disable the maximum block count to permit undo/redo and
|
|
|
# to ensure that the prompt position does not change due to truncation.
|
|
|
# Because setting this property clears the undo/redo history, we only
|
|
|
# set it if we have to.
|
|
|
if self._control.document().maximumBlockCount() > 0:
|
|
|
self._control.document().setMaximumBlockCount(0)
|
|
|
self._control.setUndoRedoEnabled(True)
|
|
|
|
|
|
self._control.setReadOnly(False)
|
|
|
self._control.moveCursor(QtGui.QTextCursor.End)
|
|
|
|
|
|
self._executing = False
|
|
|
self._prompt_started_hook()
|
|
|
|
|
|
def _prompt_finished(self):
|
|
|
""" Called immediately after a prompt is finished, i.e. when some input
|
|
|
will be processed and a new prompt displayed.
|
|
|
"""
|
|
|
self._control.setReadOnly(True)
|
|
|
self._prompt_finished_hook()
|
|
|
|
|
|
def _readline(self, prompt='', callback=None):
|
|
|
""" Reads one line of input from the user.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
prompt : str, optional
|
|
|
The prompt to print before reading the line.
|
|
|
|
|
|
callback : callable, optional
|
|
|
A callback to execute with the read line. If not specified, input is
|
|
|
read *synchronously* and this method does not return until it has
|
|
|
been read.
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
If a callback is specified, returns nothing. Otherwise, returns the
|
|
|
input string with the trailing newline stripped.
|
|
|
"""
|
|
|
if self._reading:
|
|
|
raise RuntimeError('Cannot read a line. Widget is already reading.')
|
|
|
|
|
|
if not callback and not self.isVisible():
|
|
|
# If the user cannot see the widget, this function cannot return.
|
|
|
raise RuntimeError('Cannot synchronously read a line if the widget '
|
|
|
'is not visible!')
|
|
|
|
|
|
self._reading = True
|
|
|
self._show_prompt(prompt, newline=False)
|
|
|
|
|
|
if callback is None:
|
|
|
self._reading_callback = None
|
|
|
while self._reading:
|
|
|
QtCore.QCoreApplication.processEvents()
|
|
|
return self.input_buffer.rstrip('\n')
|
|
|
|
|
|
else:
|
|
|
self._reading_callback = lambda: \
|
|
|
callback(self.input_buffer.rstrip('\n'))
|
|
|
|
|
|
def _set_continuation_prompt(self, prompt, html=False):
|
|
|
""" Sets the continuation prompt.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
prompt : str
|
|
|
The prompt to show when more input is needed.
|
|
|
|
|
|
html : bool, optional (default False)
|
|
|
If set, the prompt will be inserted as formatted HTML. Otherwise,
|
|
|
the prompt will be treated as plain text, though ANSI color codes
|
|
|
will be handled.
|
|
|
"""
|
|
|
if html:
|
|
|
self._continuation_prompt_html = prompt
|
|
|
else:
|
|
|
self._continuation_prompt = prompt
|
|
|
self._continuation_prompt_html = None
|
|
|
|
|
|
def _set_cursor(self, cursor):
|
|
|
""" Convenience method to set the current cursor.
|
|
|
"""
|
|
|
self._control.setTextCursor(cursor)
|
|
|
|
|
|
def _show_context_menu(self, pos):
|
|
|
""" Shows a context menu at the given QPoint (in widget coordinates).
|
|
|
"""
|
|
|
menu = QtGui.QMenu()
|
|
|
|
|
|
copy_action = menu.addAction('Copy', self.copy)
|
|
|
copy_action.setEnabled(self._get_cursor().hasSelection())
|
|
|
copy_action.setShortcut(QtGui.QKeySequence.Copy)
|
|
|
|
|
|
paste_action = menu.addAction('Paste', self.paste)
|
|
|
paste_action.setEnabled(self.can_paste())
|
|
|
paste_action.setShortcut(QtGui.QKeySequence.Paste)
|
|
|
|
|
|
menu.addSeparator()
|
|
|
menu.addAction('Select All', self.select_all)
|
|
|
|
|
|
menu.exec_(self._control.mapToGlobal(pos))
|
|
|
|
|
|
def _show_prompt(self, prompt=None, html=False, newline=True):
|
|
|
""" Writes a new prompt at the end of the buffer.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
prompt : str, optional
|
|
|
The prompt to show. If not specified, the previous prompt is used.
|
|
|
|
|
|
html : bool, optional (default False)
|
|
|
Only relevant when a prompt is specified. If set, the prompt will
|
|
|
be inserted as formatted HTML. Otherwise, the prompt will be treated
|
|
|
as plain text, though ANSI color codes will be handled.
|
|
|
|
|
|
newline : bool, optional (default True)
|
|
|
If set, a new line will be written before showing the prompt if
|
|
|
there is not already a newline at the end of the buffer.
|
|
|
"""
|
|
|
# Insert a preliminary newline, if necessary.
|
|
|
if newline:
|
|
|
cursor = self._get_end_cursor()
|
|
|
if cursor.position() > 0:
|
|
|
cursor.movePosition(QtGui.QTextCursor.Left,
|
|
|
QtGui.QTextCursor.KeepAnchor)
|
|
|
if str(cursor.selection().toPlainText()) != '\n':
|
|
|
self._append_plain_text('\n')
|
|
|
|
|
|
# Write the prompt.
|
|
|
self._append_plain_text(self._prompt_sep)
|
|
|
if prompt is None:
|
|
|
if self._prompt_html is None:
|
|
|
self._append_plain_text(self._prompt)
|
|
|
else:
|
|
|
self._append_html(self._prompt_html)
|
|
|
else:
|
|
|
if html:
|
|
|
self._prompt = self._append_html_fetching_plain_text(prompt)
|
|
|
self._prompt_html = prompt
|
|
|
else:
|
|
|
self._append_plain_text(prompt)
|
|
|
self._prompt = prompt
|
|
|
self._prompt_html = None
|
|
|
|
|
|
self._prompt_pos = self._get_end_cursor().position()
|
|
|
self._prompt_started()
|
|
|
|
|
|
#------ Signal handlers ----------------------------------------------------
|
|
|
|
|
|
def _cursor_position_changed(self):
|
|
|
""" Clears the temporary buffer based on the cursor position.
|
|
|
"""
|
|
|
if self._text_completing_pos:
|
|
|
document = self._control.document()
|
|
|
if self._text_completing_pos < document.characterCount():
|
|
|
cursor = self._control.textCursor()
|
|
|
pos = cursor.position()
|
|
|
text_cursor = self._control.textCursor()
|
|
|
text_cursor.setPosition(self._text_completing_pos)
|
|
|
if pos < self._text_completing_pos or \
|
|
|
cursor.blockNumber() > text_cursor.blockNumber():
|
|
|
self._clear_temporary_buffer()
|
|
|
self._text_completing_pos = 0
|
|
|
else:
|
|
|
self._clear_temporary_buffer()
|
|
|
self._text_completing_pos = 0
|
|
|
|
