upstream/ipython Files · IPython/external/qt.py

use Popen instead of getstatusoutput to check for libedit....

use Popen instead of getstatusoutput to check for libedit. getstatusoutput uses os.popen, and is vulnerable to EINTR weirdness in environments such as gdb or PyQt. Exponential falloff is also used, to prevent waiting forever or firing requests too fast, though I haven't had it fire more than once after moving to Popen. closes gh-473

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      """ A Qt API selector that can be used to switch between PyQt and PySide.

      """

      import os

      # Available APIs.

      QT_API_PYQT = 'pyqt'

      QT_API_PYSIDE = 'pyside'

      # Use PyQt by default until PySide is stable.

      QT_API = os.environ.get('QT_API', QT_API_PYQT)

      if QT_API == QT_API_PYQT:

          # For PySide compatibility, use the new-style string API that automatically

          # converts QStrings to Unicode Python strings. Also, automatically unpack

          # QVariants to their underlying objects.

          import sip

          sip.setapi('QString', 2)

          sip.setapi('QVariant', 2)

          from PyQt4 import QtCore, QtGui, QtSvg

          # Alias PyQt-specific functions for PySide compatibility.

          QtCore.Signal = QtCore.pyqtSignal

          QtCore.Slot = QtCore.pyqtSlot

      elif QT_API == QT_API_PYSIDE:

          from PySide import QtCore, QtGui, QtSvg

      else:

          raise RuntimeError('Invalid Qt API %r, valid values are: %r or %r' % 

                             (QT_API, QT_API_PYQT, QT_API_PYSIDE))

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				""" A Qt API selector that can be used to switch between PyQt and PySide.
				"""

				import os

				# Available APIs.
				QT_API_PYQT = 'pyqt'
				QT_API_PYSIDE = 'pyside'

				# Use PyQt by default until PySide is stable.
				QT_API = os.environ.get('QT_API', QT_API_PYQT)

				if QT_API == QT_API_PYQT:
				# For PySide compatibility, use the new-style string API that automatically
				# converts QStrings to Unicode Python strings. Also, automatically unpack
				# QVariants to their underlying objects.
				import sip
				sip.setapi('QString', 2)
				sip.setapi('QVariant', 2)

				from PyQt4 import QtCore, QtGui, QtSvg

				# Alias PyQt-specific functions for PySide compatibility.
				QtCore.Signal = QtCore.pyqtSignal
				QtCore.Slot = QtCore.pyqtSlot

				elif QT_API == QT_API_PYSIDE:
				from PySide import QtCore, QtGui, QtSvg

				else:
				raise RuntimeError('Invalid Qt API %r, valid values are: %r or %r' %
				(QT_API, QT_API_PYQT, QT_API_PYSIDE))