command.py

from PyQt4 import QtGui
from PyQt4 import QtCore
#from PyQt4 import *
import subprocess
import sys

class CommandTextView(QtGui.QWidget):
    ''' Nice TextView that reads the output of a command syncronously '''
    def __init__(self, command):
        '''command : the shell command to spawn'''
        QtGui.QWidget.__init__(self) #, parent=None)
        self._layout = QtGui.QVBoxLayout(self)
        self._layout.setContentsMargins(3, 3, 3, 3)

        self.output_text = QtGui.QTextEdit(self)
        self.output_text.setAcceptDrops(False)
        self.output_text.setTabChangesFocus(True)
        self.output_text.setUndoRedoEnabled(False)
        self.output_text.setReadOnly(True)
        self.output_text.setAcceptRichText(False)
        self._layout.addWidget(self.output_text)
        self.command = command

    def run(self):
        ''' Runs the process '''
        #proc = subprocess.Popen(self.command, stdout = subprocess.PIPE) # Spawning
        self.proc = QtCore.QProcess(self)
        QtCore.QObject.connect(self.proc, SIGNAL("readyReadStdout()"), self.write_to_buffer())
        self.proc.start(command)

    def write_to_buffer(self):
        strOut = self.proc.readAllStandardOutput()
        cursor = self.output_text.textCursor()
        cursor.movePosition(cursor.End)
        text = self.output_text
        cursor.insertText(strOut) # When running don't touch the TextView!!
        cursor.movePosition(cursor.End)
        text.setTextCursor(cursor)