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# System library imports
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from IPython.external.qt import QtGui
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# Local imports
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from IPython.utils.traitlets import Bool
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from console_widget import ConsoleWidget
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class HistoryConsoleWidget(ConsoleWidget):
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""" A ConsoleWidget that keeps a history of the commands that have been
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executed and provides a readline-esque interface to this history.
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"""
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#------ Configuration ------------------------------------------------------
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# If enabled, the input buffer will become "locked" to history movement when
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# an edit is made to a multi-line input buffer. To override the lock, use
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# Shift in conjunction with the standard history cycling keys.
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history_lock = Bool(False, config=True)
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#---------------------------------------------------------------------------
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# 'object' interface
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#---------------------------------------------------------------------------
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def __init__(self, *args, **kw):
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super(HistoryConsoleWidget, self).__init__(*args, **kw)
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# HistoryConsoleWidget protected variables.
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self._history = []
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self._history_edits = {}
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self._history_index = 0
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self._history_prefix = ''
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#---------------------------------------------------------------------------
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# 'ConsoleWidget' public interface
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#---------------------------------------------------------------------------
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def execute(self, source=None, hidden=False, interactive=False):
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""" Reimplemented to the store history.
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"""
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if not hidden:
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history = self.input_buffer if source is None else source
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executed = super(HistoryConsoleWidget, self).execute(
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source, hidden, interactive)
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if executed and not hidden:
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# Save the command unless it was an empty string or was identical
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# to the previous command.
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history = history.rstrip()
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if history and (not self._history or self._history[-1] != history):
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self._history.append(history)
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# Emulate readline: reset all history edits.
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self._history_edits = {}
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# Move the history index to the most recent item.
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self._history_index = len(self._history)
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return executed
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#---------------------------------------------------------------------------
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# 'ConsoleWidget' abstract interface
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#---------------------------------------------------------------------------
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def _up_pressed(self, shift_modifier):
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""" Called when the up key is pressed. Returns whether to continue
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processing the event.
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"""
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prompt_cursor = self._get_prompt_cursor()
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if self._get_cursor().blockNumber() == prompt_cursor.blockNumber():
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# Bail out if we're locked.
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if self._history_locked() and not shift_modifier:
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return False
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# Set a search prefix based on the cursor position.
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col = self._get_input_buffer_cursor_column()
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input_buffer = self.input_buffer
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# use the *shortest* of the cursor column and the history prefix
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# to determine if the prefix has changed
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n = min(col, len(self._history_prefix))
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# prefix changed, restart search from the beginning
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if (self._history_prefix[:n] != input_buffer[:n]):
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self._history_index = len(self._history)
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# the only time we shouldn't set the history prefix
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# to the line up to the cursor is if we are already
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# in a simple scroll (no prefix),
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# and the cursor is at the end of the first line
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first_line = input_buffer.split('\n', 1)[0]
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if self._history_index == len(self._history) or \
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not (self._history_prefix == '' and col == len(first_line)) or \
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not (self._get_edited_history(self._history_index)[:col] == input_buffer[:col]):
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self._history_prefix = input_buffer[:col]
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# Perform the search.
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self.history_previous(self._history_prefix,
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as_prefix=not shift_modifier)
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# Go to the first line of the prompt for seemless history scrolling.
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# Emulate readline: keep the cursor position fixed for a prefix
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# search.
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cursor = self._get_prompt_cursor()
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if self._history_prefix:
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cursor.movePosition(QtGui.QTextCursor.Right,
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n=len(self._history_prefix))
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else:
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cursor.movePosition(QtGui.QTextCursor.EndOfLine)
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self._set_cursor(cursor)
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return False
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return True
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def _down_pressed(self, shift_modifier):
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""" Called when the down key is pressed. Returns whether to continue
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processing the event.
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"""
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end_cursor = self._get_end_cursor()
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if self._get_cursor().blockNumber() == end_cursor.blockNumber():
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# Bail out if we're locked.
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if self._history_locked() and not shift_modifier:
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return False
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# Perform the search.
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replaced = self.history_next(self._history_prefix,
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as_prefix=not shift_modifier)
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# Emulate readline: keep the cursor position fixed for a prefix
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# search. (We don't need to move the cursor to the end of the buffer
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# in the other case because this happens automatically when the
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# input buffer is set.)
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if self._history_prefix and replaced:
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cursor = self._get_prompt_cursor()
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cursor.movePosition(QtGui.QTextCursor.Right,
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n=len(self._history_prefix))
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self._set_cursor(cursor)
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return False
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return True
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#---------------------------------------------------------------------------
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# 'HistoryConsoleWidget' public interface
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#---------------------------------------------------------------------------
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def history_previous(self, substring='', as_prefix=True):
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""" If possible, set the input buffer to a previous history item.
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Parameters:
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-----------
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substring : str, optional
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If specified, search for an item with this substring.
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as_prefix : bool, optional
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If True, the substring must match at the beginning (default).
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Returns:
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--------
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Whether the input buffer was changed.
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"""
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index = self._history_index
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replace = False
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while index > 0:
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index -= 1
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history = self._get_edited_history(index)
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if (as_prefix and history.startswith(substring)) \
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or (not as_prefix and substring in history):
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replace = True
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break
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if replace:
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self._store_edits()
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self._history_index = index
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self.input_buffer = history
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return replace
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def history_next(self, substring='', as_prefix=True):
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""" If possible, set the input buffer to a subsequent history item.
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Parameters:
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-----------
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substring : str, optional
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If specified, search for an item with this substring.
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as_prefix : bool, optional
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If True, the substring must match at the beginning (default).
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Returns:
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--------
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Whether the input buffer was changed.
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"""
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index = self._history_index
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replace = False
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while index < len(self._history):
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index += 1
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history = self._get_edited_history(index)
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if (as_prefix and history.startswith(substring)) \
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or (not as_prefix and substring in history):
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replace = True
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break
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if replace:
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self._store_edits()
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self._history_index = index
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self.input_buffer = history
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return replace
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def history_tail(self, n=10):
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""" Get the local history list.
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Parameters:
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-----------
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n : int
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The (maximum) number of history items to get.
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"""
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return self._history[-n:]
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def _request_update_session_history_length(self):
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msg_id = self.kernel_manager.shell_channel.execute('',
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silent=True,
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user_expressions={
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'hlen':'len(get_ipython().history_manager.input_hist_raw)',
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}
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)
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self._request_info['execute'][msg_id] = self._ExecutionRequest(msg_id, 'save_magic')
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def _handle_execute_reply(self, msg):
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""" Handles replies for code execution, here only session history length
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"""
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msg_id = msg['parent_header']['msg_id']
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info = self._request_info['execute'].pop(msg_id,None)
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if info and info.kind == 'save_magic' and not self._hidden:
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content = msg['content']
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status = content['status']
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if status == 'ok':
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self._max_session_history=(int(content['user_expressions']['hlen']))
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def save_magic(self):
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# update the session history length
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self._request_update_session_history_length()
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file_name,extFilter = QtGui.QFileDialog.getSaveFileName(self,
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"Enter A filename",
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filter='Python File (*.py);; All files (*.*)'
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)
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# let's the user search/type for a file name, while the history length
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# is fetched
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if file_name:
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hist_range, ok = QtGui.QInputDialog.getText(self,
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'Please enter an interval of command to save',
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'Saving commands:',
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text=str('1-'+str(self._max_session_history))
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)
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if ok:
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self.execute("%save"+" "+file_name+" "+str(hist_range))
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#---------------------------------------------------------------------------
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# 'HistoryConsoleWidget' protected interface
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#---------------------------------------------------------------------------
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def _history_locked(self):
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""" Returns whether history movement is locked.
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"""
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return (self.history_lock and
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(self._get_edited_history(self._history_index) !=
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self.input_buffer) and
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(self._get_prompt_cursor().blockNumber() !=
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self._get_end_cursor().blockNumber()))
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def _get_edited_history(self, index):
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""" Retrieves a history item, possibly with temporary edits.
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"""
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if index in self._history_edits:
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return self._history_edits[index]
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elif index == len(self._history):
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return unicode()
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return self._history[index]
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def _set_history(self, history):
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""" Replace the current history with a sequence of history items.
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"""
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self._history = list(history)
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self._history_edits = {}
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self._history_index = len(self._history)
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def _store_edits(self):
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""" If there are edits to the current input buffer, store them.
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"""
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current = self.input_buffer
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if self._history_index == len(self._history) or \
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self._history[self._history_index] != current:
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self._history_edits[self._history_index] = current
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