320 lines
10 KiB
Python
320 lines
10 KiB
Python
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# source: http://stackoverflow.com/questions/2758159/how-to-embed-a-python-interpreter-in-a-pyqt-widget
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import sys, os, re
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import traceback, platform
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from PyQt5 import QtCore
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from PyQt5 import QtGui
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from PyQt5 import QtWidgets
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from electrum_bitcoinprivate import util
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if platform.system() == 'Windows':
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MONOSPACE_FONT = 'Lucida Console'
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elif platform.system() == 'Darwin':
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MONOSPACE_FONT = 'Monaco'
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else:
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MONOSPACE_FONT = 'monospace'
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class Console(QtWidgets.QPlainTextEdit):
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def __init__(self, prompt='>> ', startup_message='', parent=None):
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QtWidgets.QPlainTextEdit.__init__(self, parent)
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self.prompt = prompt
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self.history = []
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self.namespace = {}
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self.construct = []
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self.setGeometry(50, 75, 600, 400)
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self.setWordWrapMode(QtGui.QTextOption.WrapAnywhere)
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self.setUndoRedoEnabled(False)
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self.document().setDefaultFont(QtGui.QFont(MONOSPACE_FONT, 10, QtGui.QFont.Normal))
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self.showMessage(startup_message)
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self.updateNamespace({'run':self.run_script})
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self.set_json(False)
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def set_json(self, b):
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self.is_json = b
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def run_script(self, filename):
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with open(filename) as f:
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script = f.read()
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# eval is generally considered bad practice. use it wisely!
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result = eval(script, self.namespace, self.namespace)
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def updateNamespace(self, namespace):
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self.namespace.update(namespace)
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def showMessage(self, message):
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self.appendPlainText(message)
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self.newPrompt()
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def clear(self):
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self.setPlainText('')
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self.newPrompt()
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def newPrompt(self):
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if self.construct:
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prompt = '.' * len(self.prompt)
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else:
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prompt = self.prompt
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self.completions_pos = self.textCursor().position()
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self.completions_visible = False
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self.appendPlainText(prompt)
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self.moveCursor(QtGui.QTextCursor.End)
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def getCommand(self):
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doc = self.document()
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curr_line = doc.findBlockByLineNumber(doc.lineCount() - 1).text()
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curr_line = curr_line.rstrip()
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curr_line = curr_line[len(self.prompt):]
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return curr_line
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def setCommand(self, command):
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if self.getCommand() == command:
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return
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doc = self.document()
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curr_line = doc.findBlockByLineNumber(doc.lineCount() - 1).text()
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self.moveCursor(QtGui.QTextCursor.End)
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for i in range(len(curr_line) - len(self.prompt)):
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self.moveCursor(QtGui.QTextCursor.Left, QtGui.QTextCursor.KeepAnchor)
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self.textCursor().removeSelectedText()
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self.textCursor().insertText(command)
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self.moveCursor(QtGui.QTextCursor.End)
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def show_completions(self, completions):
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if self.completions_visible:
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self.hide_completions()
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c = self.textCursor()
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c.setPosition(self.completions_pos)
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completions = map(lambda x: x.split('.')[-1], completions)
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t = '\n' + ' '.join(completions)
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if len(t) > 500:
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t = t[:500] + '...'
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c.insertText(t)
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self.completions_end = c.position()
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self.moveCursor(QtGui.QTextCursor.End)
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self.completions_visible = True
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def hide_completions(self):
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if not self.completions_visible:
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return
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c = self.textCursor()
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c.setPosition(self.completions_pos)
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l = self.completions_end - self.completions_pos
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for x in range(l): c.deleteChar()
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self.moveCursor(QtGui.QTextCursor.End)
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self.completions_visible = False
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def getConstruct(self, command):
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if self.construct:
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prev_command = self.construct[-1]
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self.construct.append(command)
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if not prev_command and not command:
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ret_val = '\n'.join(self.construct)
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self.construct = []
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return ret_val
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else:
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return ''
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else:
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if command and command[-1] == (':'):
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self.construct.append(command)
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return ''
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else:
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return command
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def getHistory(self):
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return self.history
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def setHisory(self, history):
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self.history = history
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def addToHistory(self, command):
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if command[0:1] == ' ':
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return
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if command and (not self.history or self.history[-1] != command):
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self.history.append(command)
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self.history_index = len(self.history)
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def getPrevHistoryEntry(self):
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if self.history:
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self.history_index = max(0, self.history_index - 1)
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return self.history[self.history_index]
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return ''
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def getNextHistoryEntry(self):
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if self.history:
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hist_len = len(self.history)
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self.history_index = min(hist_len, self.history_index + 1)
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if self.history_index < hist_len:
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return self.history[self.history_index]
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return ''
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def getCursorPosition(self):
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c = self.textCursor()
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return c.position() - c.block().position() - len(self.prompt)
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def setCursorPosition(self, position):
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self.moveCursor(QtGui.QTextCursor.StartOfLine)
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for i in range(len(self.prompt) + position):
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self.moveCursor(QtGui.QTextCursor.Right)
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def register_command(self, c, func):
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methods = { c: func}
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self.updateNamespace(methods)
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def runCommand(self):
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command = self.getCommand()
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self.addToHistory(command)
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command = self.getConstruct(command)
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if command:
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tmp_stdout = sys.stdout
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class stdoutProxy():
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def __init__(self, write_func):
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self.write_func = write_func
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self.skip = False
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def flush(self):
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pass
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def write(self, text):
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if not self.skip:
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stripped_text = text.rstrip('\n')
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self.write_func(stripped_text)
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QtCore.QCoreApplication.processEvents()
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self.skip = not self.skip
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if type(self.namespace.get(command)) == type(lambda:None):
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self.appendPlainText("'{}' is a function. Type '{}()' to use it in the Python console."
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.format(command, command))
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self.newPrompt()
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return
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sys.stdout = stdoutProxy(self.appendPlainText)
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try:
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try:
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# eval is generally considered bad practice. use it wisely!
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result = eval(command, self.namespace, self.namespace)
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if result != None:
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if self.is_json:
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util.print_msg(util.json_encode(result))
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else:
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self.appendPlainText(repr(result))
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except SyntaxError:
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# exec is generally considered bad practice. use it wisely!
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exec(command, self.namespace, self.namespace)
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except SystemExit:
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self.close()
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except BaseException:
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traceback_lines = traceback.format_exc().split('\n')
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# Remove traceback mentioning this file, and a linebreak
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for i in (3,2,1,-1):
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traceback_lines.pop(i)
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self.appendPlainText('\n'.join(traceback_lines))
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sys.stdout = tmp_stdout
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self.newPrompt()
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self.set_json(False)
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def keyPressEvent(self, event):
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if event.key() == QtCore.Qt.Key_Tab:
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self.completions()
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return
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self.hide_completions()
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if event.key() in (QtCore.Qt.Key_Enter, QtCore.Qt.Key_Return):
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self.runCommand()
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return
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if event.key() == QtCore.Qt.Key_Home:
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self.setCursorPosition(0)
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return
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if event.key() == QtCore.Qt.Key_PageUp:
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return
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elif event.key() in (QtCore.Qt.Key_Left, QtCore.Qt.Key_Backspace):
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if self.getCursorPosition() == 0:
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return
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elif event.key() == QtCore.Qt.Key_Up:
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self.setCommand(self.getPrevHistoryEntry())
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return
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elif event.key() == QtCore.Qt.Key_Down:
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self.setCommand(self.getNextHistoryEntry())
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return
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elif event.key() == QtCore.Qt.Key_L and event.modifiers() == QtCore.Qt.ControlModifier:
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self.clear()
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super(Console, self).keyPressEvent(event)
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def completions(self):
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cmd = self.getCommand()
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lastword = re.split(' |\(|\)',cmd)[-1]
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beginning = cmd[0:-len(lastword)]
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path = lastword.split('.')
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ns = self.namespace.keys()
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if len(path) == 1:
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ns = ns
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prefix = ''
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else:
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obj = self.namespace.get(path[0])
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prefix = path[0] + '.'
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ns = dir(obj)
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completions = []
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for x in ns:
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if x[0] == '_':continue
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xx = prefix + x
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if xx.startswith(lastword):
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completions.append(xx)
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completions.sort()
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if not completions:
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self.hide_completions()
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elif len(completions) == 1:
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self.hide_completions()
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self.setCommand(beginning + completions[0])
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else:
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# find common prefix
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p = os.path.commonprefix(completions)
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if len(p)>len(lastword):
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self.hide_completions()
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self.setCommand(beginning + p)
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else:
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self.show_completions(completions)
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welcome_message = '''
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---------------------------------------------------------------
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Welcome to a primitive Python interpreter.
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---------------------------------------------------------------
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'''
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if __name__ == '__main__':
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app = QtWidgets.QApplication(sys.argv)
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console = Console(startup_message=welcome_message)
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console.updateNamespace({'myVar1' : app, 'myVar2' : 1234})
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console.show()
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sys.exit(app.exec_())
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