comparison mercurial/ui.py @ 36794:fa53a1d1f16e

ui: do not try readline support if fin/fout aren't standard streams

It's unlikely for a non-stdio stream to be a tty. Minimizing readline support
makes it much simpler to work around the unicode input() function of Python 3.

This also works on chg which duplicates client's tty to stdio fds.

36793:eca1051e6c22

            return self._isatty(self.fout)

        return i

    def _readline(self):
        if self._isatty(self.fin):
            try:
                # magically add command line editing support, where
                # available
                import readline
                # force demandimport to really load the module
                readline.read_history_file
                # windows sometimes raises something other than ImportError
            except Exception:
                pass

        # prompt ' ' must exist; otherwise readline may delete entire line
        # - http://bugs.python.org/issue12833
        with self.timeblockedsection('stdio'):
            sin, sout = sys.stdin, sys.stdout

36794:fa53a1d1f16e

            return self._isatty(self.fout)

        return i

    def _readline(self):
        usereadline = (self._isatty(self.fin) and self._isatty(self.fout)
                       and util.isstdin(self.fin) and util.isstdout(self.fout))
        if usereadline:
            try:
                # magically add command line editing support, where
                # available
                import readline
                # force demandimport to really load the module
                readline.read_history_file
                # windows sometimes raises something other than ImportError
            except Exception:
                usereadline = False

        # prompt ' ' must exist; otherwise readline may delete entire line
        # - http://bugs.python.org/issue12833
        with self.timeblockedsection('stdio'):
            sin, sout = sys.stdin, sys.stdout