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console_widget.py
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/ IPython / frontend / qt / console / console_widget.py
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""" An abstract base class for console-type widgets.
"""
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
# Standard library imports
import os
from os.path import commonprefix
import re
import sys
from textwrap import dedent
from unicodedata import category
# System library imports
from IPython.external.qt import QtCore, QtGui
# Local imports
from IPython.config.configurable import LoggingConfigurable
from IPython.frontend.qt.rich_text import HtmlExporter
from IPython.frontend.qt.util import MetaQObjectHasTraits, get_font
from IPython.utils.text import columnize
from IPython.utils.traitlets import Bool, Enum, Int, Unicode
from ansi_code_processor import QtAnsiCodeProcessor
from completion_widget import CompletionWidget
from kill_ring import QtKillRing
#-----------------------------------------------------------------------------
# Functions
#-----------------------------------------------------------------------------
def is_letter_or_number(char):
""" Returns whether the specified unicode character is a letter or a number.
"""
cat = category(char)
return cat.startswith('L') or cat.startswith('N')
#-----------------------------------------------------------------------------
# Classes
#-----------------------------------------------------------------------------
class ConsoleWidget(LoggingConfigurable, QtGui.QWidget):
""" An abstract base class for console-type widgets. This class has
functionality for:
* Maintaining a prompt and editing region
* Providing the traditional Unix-style console keyboard shortcuts
* Performing tab completion
* Paging text
* Handling ANSI escape codes
ConsoleWidget also provides a number of utility methods that will be
convenient to implementors of a console-style widget.
"""
__metaclass__ = MetaQObjectHasTraits
#------ Configuration ------------------------------------------------------
ansi_codes = Bool(True, config=True,
help="Whether to process ANSI escape codes."
)
buffer_size = Int(500, config=True,
help="""
The maximum number of lines of text before truncation. Specifying a
non-positive number disables text truncation (not recommended).
"""
)
gui_completion = Bool(False, config=True,
help="""
Use a list widget instead of plain text output for tab completion.
"""
)
# NOTE: this value can only be specified during initialization.
kind = Enum(['plain', 'rich'], default_value='plain', config=True,
help="""
The type of underlying text widget to use. Valid values are 'plain',
which specifies a QPlainTextEdit, and 'rich', which specifies a
QTextEdit.
"""
)
# NOTE: this value can only be specified during initialization.
paging = Enum(['inside', 'hsplit', 'vsplit', 'custom', 'none'],
default_value='inside', config=True,
help="""
The type of paging to use. Valid values are:
'inside' : The widget pages like a traditional terminal.
'hsplit' : When paging is requested, the widget is split
horizontally. The top pane contains the console, and the
bottom pane contains the paged text.
'vsplit' : Similar to 'hsplit', except that a vertical splitter
used.
'custom' : No action is taken by the widget beyond emitting a
'custom_page_requested(str)' signal.
'none' : The text is written directly to the console.
""")
font_family = Unicode(config=True,
help="""The font family to use for the console.
On OSX this defaults to Monaco, on Windows the default is
Consolas with fallback of Courier, and on other platforms
the default is Monospace.
""")
def _font_family_default(self):
if sys.platform == 'win32':
# Consolas ships with Vista/Win7, fallback to Courier if needed
return 'Consolas'
elif sys.platform == 'darwin':
# OSX always has Monaco, no need for a fallback
return 'Monaco'
else:
# Monospace should always exist, no need for a fallback
return 'Monospace'
font_size = Int(config=True,
help="""The font size. If unconfigured, Qt will be entrusted
with the size of the font.
""")
# Whether to override ShortcutEvents for the keybindings defined by this
# widget (Ctrl+n, Ctrl+a, etc). Enable this if you want this widget to take
# priority (when it has focus) over, e.g., window-level menu shortcuts.
override_shortcuts = Bool(False)
#------ Signals ------------------------------------------------------------
# Signals that indicate ConsoleWidget state.
copy_available = QtCore.Signal(bool)
redo_available = QtCore.Signal(bool)
undo_available = QtCore.Signal(bool)
# Signal emitted when paging is needed and the paging style has been
# specified as 'custom'.
custom_page_requested = QtCore.Signal(object)
# Signal emitted when the font is changed.
font_changed = QtCore.Signal(QtGui.QFont)
#------ Protected class variables ------------------------------------------
# When the control key is down, these keys are mapped.
_ctrl_down_remap = { QtCore.Qt.Key_B : QtCore.Qt.Key_Left,
QtCore.Qt.Key_F : QtCore.Qt.Key_Right,
QtCore.Qt.Key_A : QtCore.Qt.Key_Home,
QtCore.Qt.Key_P : QtCore.Qt.Key_Up,
QtCore.Qt.Key_N : QtCore.Qt.Key_Down,
QtCore.Qt.Key_H : QtCore.Qt.Key_Backspace,
QtCore.Qt.Key_D : QtCore.Qt.Key_Delete, }
if not sys.platform == 'darwin':
# On OS X, Ctrl-E already does the right thing, whereas End moves the
# cursor to the bottom of the buffer.
_ctrl_down_remap[QtCore.Qt.Key_E] = QtCore.Qt.Key_End
# The shortcuts defined by this widget. We need to keep track of these to
# support 'override_shortcuts' above.
_shortcuts = set(_ctrl_down_remap.keys() +
[ QtCore.Qt.Key_C, QtCore.Qt.Key_G, QtCore.Qt.Key_O,
QtCore.Qt.Key_V ])
#---------------------------------------------------------------------------
# 'QObject' interface
#---------------------------------------------------------------------------
def __init__(self, parent=None, **kw):
""" Create a ConsoleWidget.
Parameters:
-----------
parent : QWidget, optional [default None]
The parent for this widget.
"""
QtGui.QWidget.__init__(self, parent)
LoggingConfigurable.__init__(self, **kw)
# Create the layout and underlying text widget.
layout = QtGui.QStackedLayout(self)
layout.setContentsMargins(0, 0, 0, 0)
self._control = self._create_control()
self._page_control = None
self._splitter = None
if self.paging in ('hsplit', 'vsplit'):
self._splitter = QtGui.QSplitter()
if self.paging == 'hsplit':
self._splitter.setOrientation(QtCore.Qt.Horizontal)
else:
self._splitter.setOrientation(QtCore.Qt.Vertical)
self._splitter.addWidget(self._control)
layout.addWidget(self._splitter)
else:
layout.addWidget(self._control)
# Create the paging widget, if necessary.
if self.paging in ('inside', 'hsplit', 'vsplit'):
self._page_control = self._create_page_control()
if self._splitter:
self._page_control.hide()
self._splitter.addWidget(self._page_control)
else:
layout.addWidget(self._page_control)
# Initialize protected variables. Some variables contain useful state
# information for subclasses; they should be considered read-only.
self._append_before_prompt_pos = 0
self._ansi_processor = QtAnsiCodeProcessor()
self._completion_widget = CompletionWidget(self._control)
self._continuation_prompt = '> '
self._continuation_prompt_html = None
self._executing = False
self._filter_drag = False
self._filter_resize = False
self._html_exporter = HtmlExporter(self._control)
self._input_buffer_executing = ''
self._input_buffer_pending = ''
self._kill_ring = QtKillRing(self._control)
self._prompt = ''
self._prompt_html = None
self._prompt_pos = 0
self._prompt_sep = ''
self._reading = False
self._reading_callback = None
self._tab_width = 8
self._text_completing_pos = 0
# Set a monospaced font.
self.reset_font()
# Configure actions.
action = QtGui.QAction('Print', None)
action.setEnabled(True)
printkey = QtGui.QKeySequence(QtGui.QKeySequence.Print)
if printkey.matches("Ctrl+P") and sys.platform != 'darwin':
# Only override the default if there is a collision.
# Qt ctrl = cmd on OSX, so the match gets a false positive on OSX.
printkey = "Ctrl+Shift+P"
action.setShortcut(printkey)
action.setShortcutContext(QtCore.Qt.WidgetWithChildrenShortcut)
action.triggered.connect(self.print_)
self.addAction(action)
self._print_action = action
action = QtGui.QAction('Save as HTML/XML', None)
action.setShortcut(QtGui.QKeySequence.Save)
action.setShortcutContext(QtCore.Qt.WidgetWithChildrenShortcut)
action.triggered.connect(self.export_html)
self.addAction(action)
self._export_action = action
action = QtGui.QAction('Select All', None)
action.setEnabled(True)
action.setShortcut(QtGui.QKeySequence.SelectAll)
action.setShortcutContext(QtCore.Qt.WidgetWithChildrenShortcut)
action.triggered.connect(self.select_all)
self.addAction(action)
self._select_all_action = action
def eventFilter(self, obj, event):
""" Reimplemented to ensure a console-like behavior in the underlying
text widgets.
"""
etype = event.type()
if etype == QtCore.QEvent.KeyPress:
# Re-map keys for all filtered widgets.
key = event.key()
if self._control_key_down(event.modifiers()) and \
key in self._ctrl_down_remap:
new_event = QtGui.QKeyEvent(QtCore.QEvent.KeyPress,
self._ctrl_down_remap[key],
QtCore.Qt.NoModifier)
QtGui.qApp.sendEvent(obj, new_event)
return True
elif obj == self._control:
return self._event_filter_console_keypress(event)
elif obj == self._page_control:
return self._event_filter_page_keypress(event)
# Make middle-click paste safe.
elif etype == QtCore.QEvent.MouseButtonRelease and \
event.button() == QtCore.Qt.MidButton and \
obj == self._control.viewport():
cursor = self._control.cursorForPosition(event.pos())
self._control.setTextCursor(cursor)
self.paste(QtGui.QClipboard.Selection)
return True
# Manually adjust the scrollbars *after* a resize event is dispatched.
elif etype == QtCore.QEvent.Resize and not self._filter_resize:
self._filter_resize = True
QtGui.qApp.sendEvent(obj, event)
self._adjust_scrollbars()
self._filter_resize = False
return True
# Override shortcuts for all filtered widgets.
elif etype == QtCore.QEvent.ShortcutOverride and \
self.override_shortcuts and \
self._control_key_down(event.modifiers()) and \
event.key() in self._shortcuts:
event.accept()
# Ensure that drags are safe. The problem is that the drag starting
# logic, which determines whether the drag is a Copy or Move, is locked
# down in QTextControl. If the widget is editable, which it must be if
# we're not executing, the drag will be a Move. The following hack
# prevents QTextControl from deleting the text by clearing the selection
# when a drag leave event originating from this widget is dispatched.
# The fact that we have to clear the user's selection is unfortunate,
# but the alternative--trying to prevent Qt from using its hardwired
# drag logic and writing our own--is worse.
elif etype == QtCore.QEvent.DragEnter and \
obj == self._control.viewport() and \
event.source() == self._control.viewport():
self._filter_drag = True
elif etype == QtCore.QEvent.DragLeave and \
obj == self._control.viewport() and \
self._filter_drag:
cursor = self._control.textCursor()
cursor.clearSelection()
self._control.setTextCursor(cursor)
self._filter_drag = False
# Ensure that drops are safe.
elif etype == QtCore.QEvent.Drop and obj == self._control.viewport():
cursor = self._control.cursorForPosition(event.pos())
if self._in_buffer(cursor.position()):
text = event.mimeData().text()
self._insert_plain_text_into_buffer(cursor, text)
# Qt is expecting to get something here--drag and drop occurs in its
# own event loop. Send a DragLeave event to end it.
QtGui.qApp.sendEvent(obj, QtGui.QDragLeaveEvent())
return True
return super(ConsoleWidget, self).eventFilter(obj, event)
#---------------------------------------------------------------------------
# 'QWidget' interface
#---------------------------------------------------------------------------
def sizeHint(self):
""" Reimplemented to suggest a size that is 80 characters wide and
25 lines high.
"""
font_metrics = QtGui.QFontMetrics(self.font)
margin = (self._control.frameWidth() +
self._control.document().documentMargin()) * 2
style = self.style()
splitwidth = style.pixelMetric(QtGui.QStyle.PM_SplitterWidth)
# Note 1: Despite my best efforts to take the various margins into
# account, the width is still coming out a bit too small, so we include
# a fudge factor of one character here.
# Note 2: QFontMetrics.maxWidth is not used here or anywhere else due
# to a Qt bug on certain Mac OS systems where it returns 0.
width = font_metrics.width(' ') * 81 + margin
width += style.pixelMetric(QtGui.QStyle.PM_ScrollBarExtent)
if self.paging == 'hsplit':
width = width * 2 + splitwidth
height = font_metrics.height() * 25 + margin
if self.paging == 'vsplit':
height = height * 2 + splitwidth
return QtCore.QSize(width, height)
#---------------------------------------------------------------------------
# 'ConsoleWidget' public interface
#---------------------------------------------------------------------------
def can_copy(self):
""" Returns whether text can be copied to the clipboard.
"""
return self._control.textCursor().hasSelection()
def can_cut(self):
""" Returns whether text can be cut to the clipboard.
"""
cursor = self._control.textCursor()
return (cursor.hasSelection() and
self._in_buffer(cursor.anchor()) and
self._in_buffer(cursor.position()))
def can_paste(self):
""" Returns whether text can be pasted from the clipboard.
"""
if self._control.textInteractionFlags() & QtCore.Qt.TextEditable:
return bool(QtGui.QApplication.clipboard().text())
return False
def clear(self, keep_input=True):
""" Clear the console.
Parameters:
-----------
keep_input : bool, optional (default True)
If set, restores the old input buffer if a new prompt is written.
"""
if self._executing:
self._control.clear()
else:
if keep_input:
input_buffer = self.input_buffer
self._control.clear()
self._show_prompt()
if keep_input:
self.input_buffer = input_buffer
def copy(self):
""" Copy the currently selected text to the clipboard.
"""
self._control.copy()
def cut(self):
""" Copy the currently selected text to the clipboard and delete it
if it's inside the input buffer.
"""
self.copy()
if self.can_cut():
self._control.textCursor().removeSelectedText()
def execute(self, source=None, hidden=False, interactive=False):
""" Executes source or the input buffer, possibly prompting for more
input.
Parameters:
-----------
source : str, optional
The source to execute. If not specified, the input buffer will be
used. If specified and 'hidden' is False, the input buffer will be
replaced with the source before execution.
hidden : bool, optional (default False)
If set, no output will be shown and the prompt will not be modified.
In other words, it will be completely invisible to the user that
an execution has occurred.
interactive : bool, optional (default False)
Whether the console is to treat the source as having been manually
entered by the user. The effect of this parameter depends on the
subclass implementation.
Raises:
-------
RuntimeError
If incomplete input is given and 'hidden' is True. In this case,
it is not possible to prompt for more input.
Returns:
--------
A boolean indicating whether the source was executed.
"""
# WARNING: The order in which things happen here is very particular, in
# large part because our syntax highlighting is fragile. If you change
# something, test carefully!
# Decide what to execute.
if source is None:
source = self.input_buffer
if not hidden:
# A newline is appended later, but it should be considered part
# of the input buffer.
source += '\n'
elif not hidden:
self.input_buffer = source
# Execute the source or show a continuation prompt if it is incomplete.
complete = self._is_complete(source, interactive)
if hidden:
if complete:
self._execute(source, hidden)
else:
error = 'Incomplete noninteractive input: "%s"'
raise RuntimeError(error % source)
else:
if complete:
self._append_plain_text('\n')
self._input_buffer_executing = self.input_buffer
self._executing = True
self._prompt_finished()
# The maximum block count is only in effect during execution.
# This ensures that _prompt_pos does not become invalid due to
# text truncation.
self._control.document().setMaximumBlockCount(self.buffer_size)
# Setting a positive maximum block count will automatically
# disable the undo/redo history, but just to be safe:
self._control.setUndoRedoEnabled(False)
# Perform actual execution.
self._execute(source, hidden)
else:
# Do this inside an edit block so continuation prompts are
# removed seamlessly via undo/redo.
cursor = self._get_end_cursor()
cursor.beginEditBlock()
cursor.insertText('\n')
self._insert_continuation_prompt(cursor)
cursor.endEditBlock()
# Do not do this inside the edit block. It works as expected
# when using a QPlainTextEdit control, but does not have an
# effect when using a QTextEdit. I believe this is a Qt bug.
self._control.moveCursor(QtGui.QTextCursor.End)
return complete
def export_html(self):
""" Shows a dialog to export HTML/XML in various formats.
"""
self._html_exporter.export()
def _get_input_buffer(self, force=False):
""" The text that the user has entered entered at the current prompt.
If the console is currently executing, the text that is executing will
always be returned.
"""
# If we're executing, the input buffer may not even exist anymore due to
# the limit imposed by 'buffer_size'. Therefore, we store it.
if self._executing and not force:
return self._input_buffer_executing
cursor = self._get_end_cursor()
cursor.setPosition(self._prompt_pos, QtGui.QTextCursor.KeepAnchor)
input_buffer = cursor.selection().toPlainText()
# Strip out continuation prompts.
return input_buffer.replace('\n' + self._continuation_prompt, '\n')
def _set_input_buffer(self, string):
""" Sets the text in the input buffer.
If the console is currently executing, this call has no *immediate*
effect. When the execution is finished, the input buffer will be updated
appropriately.
"""
# If we're executing, store the text for later.
if self._executing:
self._input_buffer_pending = string
return
# Remove old text.
cursor = self._get_end_cursor()
cursor.beginEditBlock()
cursor.setPosition(self._prompt_pos, QtGui.QTextCursor.KeepAnchor)
cursor.removeSelectedText()
# Insert new text with continuation prompts.
self._insert_plain_text_into_buffer(self._get_prompt_cursor(), string)
cursor.endEditBlock()
self._control.moveCursor(QtGui.QTextCursor.End)
input_buffer = property(_get_input_buffer, _set_input_buffer)
def _get_font(self):
""" The base font being used by the ConsoleWidget.
"""
return self._control.document().defaultFont()
def _set_font(self, font):
""" Sets the base font for the ConsoleWidget to the specified QFont.
"""
font_metrics = QtGui.QFontMetrics(font)
self._control.setTabStopWidth(self.tab_width * font_metrics.width(' '))
self._completion_widget.setFont(font)
self._control.document().setDefaultFont(font)
if self._page_control:
self._page_control.document().setDefaultFont(font)
self.font_changed.emit(font)
font = property(_get_font, _set_font)
def paste(self, mode=QtGui.QClipboard.Clipboard):
""" Paste the contents of the clipboard into the input region.
Parameters:
-----------
mode : QClipboard::Mode, optional [default QClipboard::Clipboard]
Controls which part of the system clipboard is used. This can be
used to access the selection clipboard in X11 and the Find buffer
in Mac OS. By default, the regular clipboard is used.
"""
if self._control.textInteractionFlags() & QtCore.Qt.TextEditable:
# Make sure the paste is safe.
self._keep_cursor_in_buffer()
cursor = self._control.textCursor()
# Remove any trailing newline, which confuses the GUI and forces the
# user to backspace.
text = QtGui.QApplication.clipboard().text(mode).rstrip()
self._insert_plain_text_into_buffer(cursor, dedent(text))
def print_(self, printer = None):
""" Print the contents of the ConsoleWidget to the specified QPrinter.
"""
if (not printer):
printer = QtGui.QPrinter()
if(QtGui.QPrintDialog(printer).exec_() != QtGui.QDialog.Accepted):
return
self._control.print_(printer)
def prompt_to_top(self):
""" Moves the prompt to the top of the viewport.
"""
if not self._executing:
prompt_cursor = self._get_prompt_cursor()
if self._get_cursor().blockNumber() < prompt_cursor.blockNumber():
self._set_cursor(prompt_cursor)
self._set_top_cursor(prompt_cursor)
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.
"""
if sys.platform == 'win32':
# Consolas ships with Vista/Win7, fallback to Courier if needed
fallback = 'Courier'
elif sys.platform == 'darwin':
# OSX always has Monaco
fallback = 'Monaco'
else:
# Monospace should always exist
fallback = 'Monospace'
font = get_font(self.font_family, fallback)
if self.font_size:
font.setPointSize(self.font_size)
else:
font.setPointSize(QtGui.qApp.font().pointSize())
font.setStyleHint(QtGui.QFont.TypeWriter)
self._set_font(font)
def change_font_size(self, delta):
"""Change the font size by the specified amount (in points).
"""
font = self.font
size = max(font.pointSize() + delta, 1) # minimum 1 point
font.setPointSize(size)
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, shift_modifier):
""" Called when the up key is pressed. Returns whether to continue
processing the event.
"""
return True
def _down_pressed(self, shift_modifier):
""" 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_custom(self, insert, input, before_prompt=False):
""" A low-level method for appending content to the end of the buffer.
If 'before_prompt' is enabled, the content will be inserted before the
current prompt, if there is one.
"""
# Determine where to insert the content.
cursor = self._control.textCursor()
if before_prompt and not self._executing:
cursor.setPosition(self._append_before_prompt_pos)
else:
cursor.movePosition(QtGui.QTextCursor.End)
start_pos = cursor.position()
# Perform the insertion.
result = insert(cursor, input)
# Adjust the prompt position if we have inserted before it. This is safe
# because buffer truncation is disabled when not executing.
if before_prompt and not self._executing:
diff = cursor.position() - start_pos
self._append_before_prompt_pos += diff
self._prompt_pos += diff
return result
def _append_html(self, html, before_prompt=False):
""" Appends HTML at the end of the console buffer.
"""
self._append_custom(self._insert_html, html, before_prompt)
def _append_html_fetching_plain_text(self, html, before_prompt=False):
""" Appends HTML, then returns the plain text version of it.
"""
return self._append_custom(self._insert_html_fetching_plain_text,
html, before_prompt)
def _append_plain_text(self, text, before_prompt=False):
""" Appends plain text, processing ANSI codes if enabled.
"""
self._append_custom(self._insert_plain_text, text, before_prompt)
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 = 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 _context_menu_make(self, pos):
""" Creates a context menu for the given QPoint (in widget coordinates).
"""
menu = QtGui.QMenu(self)
cut_action = menu.addAction('Cut', self.cut)
cut_action.setEnabled(self.can_cut())
cut_action.setShortcut(QtGui.QKeySequence.Cut)
copy_action = menu.addAction('Copy', self.copy)
copy_action.setEnabled(self.can_copy())
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(self._select_all_action)
menu.addSeparator()
menu.addAction(self._export_action)
menu.addAction(self._print_action)
return menu
def _control_key_down(self, modifiers, include_command=False):
""" 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._custom_context_menu_requested)
control.copyAvailable.connect(self.copy_available)
control.redoAvailable.connect(self.redo_available)
control.undoAvailable.connect(self.undo_available)
# Hijack the document size change signal to prevent Qt from adjusting
# the viewport's scrollbar. We are relying on an implementation detail
# of Q(Plain)TextEdit here, which is potentially dangerous, but without
# this functionality we cannot create a nice terminal interface.
layout = control.document().documentLayout()
layout.documentSizeChanged.disconnect()
layout.documentSizeChanged.connect(self._adjust_scrollbars)
# Configure the control.
control.setAttribute(QtCore.Qt.WA_InputMethodEnabled, True)
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.
"""
if self.kind == 'plain':
control = QtGui.QPlainTextEdit()
elif self.kind == 'rich':
control = QtGui.QTextEdit()
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.Cut):
self.cut()
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):
# Special handling when a reading a line of raw input.
if self._reading:
self._append_plain_text('\n')
self._reading = False
if self._reading_callback:
self._reading_callback()
# If the input buffer is a single line or 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 = len(cursor.selectedText().strip()) == 0
single_line = (self._get_end_cursor().blockNumber() ==
self._get_prompt_cursor().blockNumber())
if (at_end or shift_down or single_line) 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))
self._kill_ring.kill_cursor(cursor)
intercepted = True
elif key == QtCore.Qt.Key_L:
self.prompt_to_top()
intercepted = True
elif key == QtCore.Qt.Key_O:
if self._page_control and self._page_control.isVisible():
self._page_control.setFocus()
intercepted = True
elif key == QtCore.Qt.Key_U:
if self._in_buffer(position):
start_line = cursor.blockNumber()
if start_line == self._get_prompt_cursor().blockNumber():
offset = len(self._prompt)
else:
offset = len(self._continuation_prompt)
cursor.movePosition(QtGui.QTextCursor.StartOfBlock,
QtGui.QTextCursor.KeepAnchor)
cursor.movePosition(QtGui.QTextCursor.Right,
QtGui.QTextCursor.KeepAnchor, offset)
self._kill_ring.kill_cursor(cursor)
intercepted = True
elif key == QtCore.Qt.Key_Y:
self._keep_cursor_in_buffer()
self._kill_ring.yank()
intercepted = True
elif key in (QtCore.Qt.Key_Backspace, QtCore.Qt.Key_Delete):
if key == QtCore.Qt.Key_Backspace:
cursor = self._get_word_start_cursor(position)
else: # key == QtCore.Qt.Key_Delete
cursor = self._get_word_end_cursor(position)
cursor.setPosition(position, QtGui.QTextCursor.KeepAnchor)
self._kill_ring.kill_cursor(cursor)
intercepted = True
elif key in (QtCore.Qt.Key_Plus, QtCore.Qt.Key_Equal):
self.change_font_size(1)
intercepted = True
elif key == QtCore.Qt.Key_Minus:
self.change_font_size(-1)
intercepted = True
elif key == QtCore.Qt.Key_0:
self.reset_font()
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_Y:
self._kill_ring.rotate()
intercepted = True
elif key == QtCore.Qt.Key_Backspace:
cursor = self._get_word_start_cursor(position)
cursor.setPosition(position, QtGui.QTextCursor.KeepAnchor)
self._kill_ring.kill_cursor(cursor)
intercepted = True
elif key == QtCore.Qt.Key_D:
cursor = self._get_word_end_cursor(position)
cursor.setPosition(position, QtGui.QTextCursor.KeepAnchor)
self._kill_ring.kill_cursor(cursor)
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 shift_down:
anchormode = QtGui.QTextCursor.KeepAnchor
else:
anchormode = QtGui.QTextCursor.MoveAnchor
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(shift_down):
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(shift_down):
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:
# Move to the previous line
line, col = cursor.blockNumber(), cursor.columnNumber()
if line > self._get_prompt_cursor().blockNumber() and \
col == len(self._continuation_prompt):
self._control.moveCursor(QtGui.QTextCursor.PreviousBlock,
mode=anchormode)
self._control.moveCursor(QtGui.QTextCursor.EndOfBlock,
mode=anchormode)
intercepted = True
# Regular left movement
else:
intercepted = not self._in_buffer(position - 1)
elif key == QtCore.Qt.Key_Right:
original_block_number = cursor.blockNumber()
cursor.movePosition(QtGui.QTextCursor.Right,
mode=anchormode)
if cursor.blockNumber() != original_block_number:
cursor.movePosition(QtGui.QTextCursor.Right,
n=len(self._continuation_prompt),
mode=anchormode)
self._set_cursor(cursor)
intercepted = True
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/Cmd is pressed to allow copy-paste
# using the keyboard in any part of the buffer. Also, permit scrolling
# with Page Up/Down keys. Finally, if we're executing, don't move the
# cursor (if even this made sense, we can't guarantee that the prompt
# position is still valid due to text truncation).
if not (self._control_key_down(event.modifiers(), include_command=True)
or key in (QtCore.Qt.Key_PageUp, QtCore.Qt.Key_PageDown)
or (self._executing and not self._reading)):
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.
"""
# 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)
return columnize(items, separator, displaywidth)
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 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 the text of the 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 is_letter_or_number(document.characterAt(position)):
position -= 1
while position >= self._prompt_pos and \
is_letter_or_number(document.characterAt(position)):
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 is_letter_or_number(document.characterAt(position)):
position += 1
while position < end and \
is_letter_or_number(document.characterAt(position)):
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 = 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 act in self._ansi_processor.actions:
# Unlike real terminal emulators, we don't distinguish
# between the screen and the scrollback buffer. A screen
# erase request clears everything.
if act.action == 'erase' and act.area == 'screen':
cursor.select(QtGui.QTextCursor.Document)
cursor.removeSelectedText()
# Simulate a form feed by scrolling just past the last line.
elif act.action == 'scroll' and act.unit == 'page':
cursor.insertText('\n')
cursor.endEditBlock()
self._set_top_cursor(cursor)
cursor.joinPreviousEditBlock()
cursor.deletePreviousChar()
format = self._ansi_processor.get_format()
cursor.insertText(substring, format)
else:
cursor.insertText(text)
cursor.endEditBlock()
def _insert_plain_text_into_buffer(self, cursor, text):
""" Inserts text into the input buffer using the specified cursor (which
must be in the input buffer), ensuring that continuation prompts are
inserted as necessary.
"""
lines = text.splitlines(True)
if lines:
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()
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, html=False):
""" Displays text using the pager if it exceeds the height of the
viewport.
Parameters:
-----------
html : bool, optional (default False)
If set, the text will be interpreted as HTML instead of plain text.
"""
line_height = QtGui.QFontMetrics(self.font).height()
minlines = self._control.viewport().height() / line_height
if self.paging != 'none' and \
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()
if html:
self._insert_html(cursor, text)
else:
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)
elif html:
self._append_plain_html(text)
else:
self._append_plain_text(text)
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 _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.
self._control.document().setMaximumBlockCount(0)
self._control.setUndoRedoEnabled(True)
# Work around bug in QPlainTextEdit: input method is not re-enabled
# when read-only is disabled.
self._control.setReadOnly(False)
self._control.setAttribute(QtCore.Qt.WA_InputMethodEnabled, True)
if not self._reading:
self._executing = False
self._prompt_started_hook()
# If the input buffer has changed while executing, load it.
if self._input_buffer_pending:
self.input_buffer = self._input_buffer_pending
self._input_buffer_pending = ''
self._control.moveCursor(QtGui.QTextCursor.End)
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._get_input_buffer(force=True).rstrip('\n')
else:
self._reading_callback = lambda: \
callback(self._get_input_buffer(force=True).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 _set_top_cursor(self, cursor):
""" Scrolls the viewport so that the specified cursor is at the top.
"""
scrollbar = self._control.verticalScrollBar()
scrollbar.setValue(scrollbar.maximum())
original_cursor = self._control.textCursor()
self._control.setTextCursor(cursor)
self._control.ensureCursorVisible()
self._control.setTextCursor(original_cursor)
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.
"""
# Save the current end position to support _append*(before_prompt=True).
cursor = self._get_end_cursor()
self._append_before_prompt_pos = cursor.position()
# Insert a preliminary newline, if necessary.
if newline and cursor.position() > 0:
cursor.movePosition(QtGui.QTextCursor.Left,
QtGui.QTextCursor.KeepAnchor)
if 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 _adjust_scrollbars(self):
""" Expands the vertical scrollbar beyond the range set by Qt.
"""
# This code is adapted from _q_adjustScrollbars in qplaintextedit.cpp
# and qtextedit.cpp.
document = self._control.document()
scrollbar = self._control.verticalScrollBar()
viewport_height = self._control.viewport().height()
if isinstance(self._control, QtGui.QPlainTextEdit):
maximum = max(0, document.lineCount() - 1)
step = viewport_height / self._control.fontMetrics().lineSpacing()
else:
# QTextEdit does not do line-based layout and blocks will not in
# general have the same height. Therefore it does not make sense to
# attempt to scroll in line height increments.
maximum = document.size().height()
step = viewport_height
diff = maximum - scrollbar.maximum()
scrollbar.setRange(0, maximum)
scrollbar.setPageStep(step)
# Compensate for undesirable scrolling that occurs automatically due to
# maximumBlockCount() text truncation.
if diff < 0 and document.blockCount() == document.maximumBlockCount():
scrollbar.setValue(scrollbar.value() + diff)
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
def _custom_context_menu_requested(self, pos):
""" Shows a context menu at the given QPoint (in widget coordinates).
"""
menu = self._context_menu_make(pos)
menu.exec_(self._control.mapToGlobal(pos))