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"""MagicHelper - dockable widget showing magic commands for the MainWindow
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"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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# stdlib imports
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import json
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import re
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import sys
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# System library imports
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from IPython.external.qt import QtGui,QtCore
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from IPython.core.magic import magic_escapes
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class MagicHelper(QtGui.QDockWidget):
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"""MagicHelper - dockable widget for convenient search and running of
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magic command for IPython QtConsole.
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"""
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#---------------------------------------------------------------------------
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# signals
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#---------------------------------------------------------------------------
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pasteRequested = QtCore.Signal(str, name = 'pasteRequested')
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"""This signal is emitted when user wants to paste selected magic
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command into the command line.
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"""
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runRequested = QtCore.Signal(str, name = 'runRequested')
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"""This signal is emitted when user wants to execute selected magic command
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"""
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readyForUpdate = QtCore.Signal(name = 'readyForUpdate')
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"""This signal is emitted when MagicHelper is ready to be populated.
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Since kernel querying mechanisms are out of scope of this class,
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it expects its owner to invoke MagicHelper.populate_magic_helper()
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as a reaction on this event.
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"""
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#---------------------------------------------------------------------------
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# constructor
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#---------------------------------------------------------------------------
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def __init__(self, name, parent):
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super(MagicHelper, self).__init__(name, parent)
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self.data = None
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class MinListWidget(QtGui.QListWidget):
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"""Temp class to overide the default QListWidget size hint
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in order to make MagicHelper narrow
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"""
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def sizeHint(self):
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s = QtCore.QSize()
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s.setHeight(super(MinListWidget,self).sizeHint().height())
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s.setWidth(self.sizeHintForColumn(0))
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return s
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# construct content
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self.frame = QtGui.QFrame()
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self.search_label = QtGui.QLabel("Search:")
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self.search_line = QtGui.QLineEdit()
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self.search_class = QtGui.QComboBox()
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self.search_list = MinListWidget()
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self.paste_button = QtGui.QPushButton("Paste")
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self.run_button = QtGui.QPushButton("Run")
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# layout all the widgets
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main_layout = QtGui.QVBoxLayout()
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search_layout = QtGui.QHBoxLayout()
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search_layout.addWidget(self.search_label)
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search_layout.addWidget(self.search_line, 10)
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main_layout.addLayout(search_layout)
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main_layout.addWidget(self.search_class)
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main_layout.addWidget(self.search_list, 10)
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action_layout = QtGui.QHBoxLayout()
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action_layout.addWidget(self.paste_button)
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action_layout.addWidget(self.run_button)
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main_layout.addLayout(action_layout)
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self.frame.setLayout(main_layout)
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self.setWidget(self.frame)
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# connect all the relevant signals to handlers
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self.visibilityChanged[bool].connect( self._update_magic_helper )
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self.search_class.activated[int].connect(
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self.class_selected
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)
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self.search_line.textChanged[str].connect(
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self.search_changed
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)
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self.search_list.itemDoubleClicked[QtGui.QListWidgetItem].connect(
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self.paste_requested
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)
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self.paste_button.clicked[bool].connect(
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self.paste_requested
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)
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self.run_button.clicked[bool].connect(
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self.run_requested
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)
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#---------------------------------------------------------------------------
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# implementation
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#---------------------------------------------------------------------------
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def _update_magic_helper(self, visible):
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"""Start update sequence.
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This method is called when MagicHelper becomes visible. It clears
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the content and emits readyForUpdate signal. The owner of the
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instance is expected to invoke populate_magic_helper() when magic
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info is available.
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"""
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if not visible or self.data is not None:
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return
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self.data = {}
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self.search_class.clear()
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self.search_class.addItem("Populating...")
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self.search_list.clear()
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self.readyForUpdate.emit()
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def populate_magic_helper(self, data):
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"""Expects data returned by lsmagics query from kernel.
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Populates the search_class and search_list with relevant items.
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"""
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self.search_class.clear()
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self.search_list.clear()
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self.data = json.loads(
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data['data'].get('application/json', {})
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)
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self.search_class.addItem('All Magics', 'any')
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classes = set()
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for mtype in sorted(self.data):
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subdict = self.data[mtype]
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for name in sorted(subdict):
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classes.add(subdict[name])
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for cls in sorted(classes):
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label = re.sub("([a-zA-Z]+)([A-Z][a-z])","\g<1> \g<2>", cls)
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self.search_class.addItem(label, cls)
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self.filter_magic_helper('.', 'any')
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def class_selected(self, index):
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"""Handle search_class selection changes
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"""
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item = self.search_class.itemData(index)
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regex = self.search_line.text()
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self.filter_magic_helper(regex = regex, cls = item)
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def search_changed(self, search_string):
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"""Handle search_line text changes.
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The text is interpreted as a regular expression
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"""
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item = self.search_class.itemData(
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self.search_class.currentIndex()
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)
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self.filter_magic_helper(regex = search_string, cls = item)
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def _get_current_search_item(self, item = None):
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"""Retrieve magic command currently selected in the search_list
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"""
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text = None
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if not isinstance(item, QtGui.QListWidgetItem):
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item = self.search_list.currentItem()
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text = item.text()
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return text
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def paste_requested(self, item = None):
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"""Emit pasteRequested signal with currently selected item text
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"""
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text = self._get_current_search_item(item)
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if text is not None:
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self.pasteRequested.emit(text)
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def run_requested(self, item = None):
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"""Emit runRequested signal with currently selected item text
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"""
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text = self._get_current_search_item(item)
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if text is not None:
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self.runRequested.emit(text)
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def filter_magic_helper(self, regex, cls):
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"""Update search_list with magic commands whose text match
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regex and class match cls.
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If cls equals 'any' - any class matches.
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"""
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if regex == "" or regex is None:
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regex = '.'
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if cls is None:
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cls = 'any'
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self.search_list.clear()
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for mtype in sorted(self.data):
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subdict = self.data[mtype]
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prefix = magic_escapes[mtype]
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for name in sorted(subdict):
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mclass = subdict[name]
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pmagic = prefix + name
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if (re.match(regex, name) or re.match(regex, pmagic)) and \
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(cls == 'any' or cls == mclass):
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self.search_list.addItem(pmagic)
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