# source: http://stackoverflow.com/questions/2758159/how-to-embed-a-python-interpreter-in-a-pyqt-widget
import sys, os, re
import traceback, platform
from PyQt4 import QtCore
from PyQt4 import QtGui
from electrum import util
if platform.system() == 'Windows':
MONOSPACE_FONT = 'Lucida Console'
elif platform.system() == 'Darwin':
MONOSPACE_FONT = 'Monaco'
else:
MONOSPACE_FONT = 'monospace'
class Console(QtGui.QPlainTextEdit):
def __init__(self, prompt='>> ', startup_message='', parent=None):
QtGui.QPlainTextEdit.__init__(self, parent)
self.prompt = prompt
self.history = []
self.namespace = {}
self.construct = []
self.setGeometry(50, 75, 600, 400)
self.setWordWrapMode(QtGui.QTextOption.WrapAnywhere)
self.setUndoRedoEnabled(False)
self.document().setDefaultFont(QtGui.QFont(MONOSPACE_FONT, 10, QtGui.QFont.Normal))
self.showMessage(startup_message)
self.updateNamespace({'run':self.run_script})
self.set_json(False)
def set_json(self, b):
self.is_json = b
def run_script(self, filename):
with open(filename) as f:
script = f.read()
# eval is generally considered bad practice. use it wisely!
result = eval(script, self.namespace, self.namespace)
def updateNamespace(self, namespace):
self.namespace.update(namespace)
def showMessage(self, message):
self.appendPlainText(message)
self.newPrompt()
def clear(self):
self.setPlainText('')
self.newPrompt()
def newPrompt(self):
if self.construct:
prompt = '.' * len(self.prompt)
else:
prompt = self.prompt
self.completions_pos = self.textCursor().position()
self.completions_visible = False
self.appendPlainText(prompt)
self.moveCursor(QtGui.QTextCursor.End)
def getCommand(self):
doc = self.document()
curr_line = unicode(doc.findBlockByLineNumber(doc.lineCount() - 1).text())
curr_line = curr_line.rstrip()
curr_line = curr_line[len(self.prompt):]
return curr_line
def setCommand(self, command):
if self.getCommand() == command:
return
doc = self.document()
curr_line = unicode(doc.findBlockByLineNumber(doc.lineCount() - 1).text())
self.moveCursor(QtGui.QTextCursor.End)
for i in range(len(curr_line) - len(self.prompt)):
self.moveCursor(QtGui.QTextCursor.Left, QtGui.QTextCursor.KeepAnchor)
self.textCursor().removeSelectedText()
self.textCursor().insertText(command)
self.moveCursor(QtGui.QTextCursor.End)
def show_completions(self, completions):
if self.completions_visible:
self.hide_completions()
c = self.textCursor()
c.setPosition(self.completions_pos)
completions = map(lambda x: x.split('.')[-1], completions)
t = '\n' + ' '.join(completions)
if len(t) > 500:
t = t[:500] + '...'
c.insertText(t)
self.completions_end = c.position()
self.moveCursor(QtGui.QTextCursor.End)
self.completions_visible = True
def hide_completions(self):
if not self.completions_visible:
return
c = self.textCursor()
c.setPosition(self.completions_pos)
l = self.completions_end - self.completions_pos
for x in range(l): c.deleteChar()
self.moveCursor(QtGui.QTextCursor.End)
self.completions_visible = False
def getConstruct(self, command):
if self.construct:
prev_command = self.construct[-1]
self.construct.append(command)
if not prev_command and not command:
ret_val = '\n'.join(self.construct)
self.construct = []
return ret_val
else:
return ''
else:
if command and command[-1] == (':'):
self.construct.append(command)
return ''
else:
return command
def getHistory(self):
return self.history
def setHisory(self, history):
self.history = history
def addToHistory(self, command):
if command[0:1] == ' ':
return
if command and (not self.history or self.history[-1] != command):
self.history.append(command)
self.history_index = len(self.history)
def getPrevHistoryEntry(self):
if self.history:
self.history_index = max(0, self.history_index - 1)
return self.history[self.history_index]
return ''
def getNextHistoryEntry(self):
if self.history:
hist_len = len(self.history)
self.history_index = min(hist_len, self.history_index + 1)
if self.history_index < hist_len:
return self.history[self.history_index]
return ''
def getCursorPosition(self):
c = self.textCursor()
return c.position() - c.block().position() - len(self.prompt)
def setCursorPosition(self, position):
self.moveCursor(QtGui.QTextCursor.StartOfLine)
for i in range(len(self.prompt) + position):
self.moveCursor(QtGui.QTextCursor.Right)
def register_command(self, c, func):
methods = { c: func}
self.updateNamespace(methods)
def runCommand(self):
command = self.getCommand()
self.addToHistory(command)
command = self.getConstruct(command)
if command:
tmp_stdout = sys.stdout
class stdoutProxy():
def __init__(self, write_func):
self.write_func = write_func
self.skip = False
def flush(self):
pass
def write(self, text):
if not self.skip:
stripped_text = text.rstrip('\n')
self.write_func(stripped_text)
QtCore.QCoreApplication.processEvents()
self.skip = not self.skip
if type(self.namespace.get(command)) == type(lambda:None):
self.appendPlainText("'%s' is a function. Type '%s()' to use it in the Python console."%(command, command))
self.newPrompt()
return
sys.stdout = stdoutProxy(self.appendPlainText)
try:
try:
# eval is generally considered bad practice. use it wisely!
result = eval(command, self.namespace, self.namespace)
if result != None:
if self.is_json:
util.print_msg(util.json_encode(result))
else:
self.appendPlainText(repr(result))
except SyntaxError:
# exec is generally considered bad practice. use it wisely!
exec command in self.namespace
except SystemExit:
self.close()
except Exception:
traceback_lines = traceback.format_exc().split('\n')
# Remove traceback mentioning this file, and a linebreak
for i in (3,2,1,-1):
traceback_lines.pop(i)
self.appendPlainText('\n'.join(traceback_lines))
sys.stdout = tmp_stdout
self.newPrompt()
self.set_json(False)
def keyPressEvent(self, event):
if event.key() == QtCore.Qt.Key_Tab:
self.completions()
return
self.hide_completions()
if event.key() in (QtCore.Qt.Key_Enter, QtCore.Qt.Key_Return):
self.runCommand()
return
if event.key() == QtCore.Qt.Key_Home:
self.setCursorPosition(0)
return
if event.key() == QtCore.Qt.Key_PageUp:
return
elif event.key() in (QtCore.Qt.Key_Left, QtCore.Qt.Key_Backspace):
if self.getCursorPosition() == 0:
return
elif event.key() == QtCore.Qt.Key_Up:
self.setCommand(self.getPrevHistoryEntry())
return
elif event.key() == QtCore.Qt.Key_Down:
self.setCommand(self.getNextHistoryEntry())
return
elif event.key() == QtCore.Qt.Key_L and event.modifiers() == QtCore.Qt.ControlModifier:
self.clear()
super(Console, self).keyPressEvent(event)
def completions(self):
cmd = self.getCommand()
lastword = re.split(' |\(|\)',cmd)[-1]
beginning = cmd[0:-len(lastword)]
path = lastword.split('.')
ns = self.namespace.keys()
if len(path) == 1:
ns = ns
prefix = ''
else:
obj = self.namespace.get(path[0])
prefix = path[0] + '.'
ns = dir(obj)
completions = []
for x in ns:
if x[0] == '_':continue
xx = prefix + x
if xx.startswith(lastword):
completions.append(xx)
completions.sort()
if not completions:
self.hide_completions()
elif len(completions) == 1:
self.hide_completions()
self.setCommand(beginning + completions[0])
else:
# find common prefix
p = os.path.commonprefix(completions)
if len(p)>len(lastword):
self.hide_completions()
self.setCommand(beginning + p)
else:
self.show_completions(completions)
welcome_message = '''
---------------------------------------------------------------
Welcome to a primitive Python interpreter.
---------------------------------------------------------------
'''
if __name__ == '__main__':
app = QtGui.QApplication(sys.argv)
console = Console(startup_message=welcome_message)
console.updateNamespace({'myVar1' : app, 'myVar2' : 1234})
console.show();
sys.exit(app.exec_())