diff --git a/mercurial/dispatch.py b/mercurial/dispatch.py --- a/mercurial/dispatch.py +++ b/mercurial/dispatch.py @@ -149,92 +149,76 @@ sys.exit(status & 255) -if pycompat.ispy3: - - def initstdio(): - # stdio streams on Python 3 are io.TextIOWrapper instances proxying another - # buffer. These streams will normalize \n to \r\n by default. Mercurial's - # preferred mechanism for writing output (ui.write()) uses io.BufferedWriter - # instances, which write to the underlying stdio file descriptor in binary - # mode. ui.write() uses \n for line endings and no line ending normalization - # is attempted through this interface. This "just works," even if the system - # preferred line ending is not \n. - # - # But some parts of Mercurial (e.g. hooks) can still send data to sys.stdout - # and sys.stderr. They will inherit the line ending normalization settings, - # potentially causing e.g. \r\n to be emitted. Since emitting \n should - # "just work," here we change the sys.* streams to disable line ending - # normalization, ensuring compatibility with our ui type. +def initstdio(): + # stdio streams on Python 3 are io.TextIOWrapper instances proxying another + # buffer. These streams will normalize \n to \r\n by default. Mercurial's + # preferred mechanism for writing output (ui.write()) uses io.BufferedWriter + # instances, which write to the underlying stdio file descriptor in binary + # mode. ui.write() uses \n for line endings and no line ending normalization + # is attempted through this interface. This "just works," even if the system + # preferred line ending is not \n. + # + # But some parts of Mercurial (e.g. hooks) can still send data to sys.stdout + # and sys.stderr. They will inherit the line ending normalization settings, + # potentially causing e.g. \r\n to be emitted. Since emitting \n should + # "just work," here we change the sys.* streams to disable line ending + # normalization, ensuring compatibility with our ui type. - if sys.stdout is not None: - # write_through is new in Python 3.7. - kwargs = { - "newline": "\n", - "line_buffering": sys.stdout.line_buffering, - } - if util.safehasattr(sys.stdout, "write_through"): - # pytype: disable=attribute-error - kwargs["write_through"] = sys.stdout.write_through - # pytype: enable=attribute-error - sys.stdout = io.TextIOWrapper( - sys.stdout.buffer, - sys.stdout.encoding, - sys.stdout.errors, - **kwargs - ) + if sys.stdout is not None: + # write_through is new in Python 3.7. + kwargs = { + "newline": "\n", + "line_buffering": sys.stdout.line_buffering, + } + if util.safehasattr(sys.stdout, "write_through"): + # pytype: disable=attribute-error + kwargs["write_through"] = sys.stdout.write_through + # pytype: enable=attribute-error + sys.stdout = io.TextIOWrapper( + sys.stdout.buffer, sys.stdout.encoding, sys.stdout.errors, **kwargs + ) - if sys.stderr is not None: - kwargs = { - "newline": "\n", - "line_buffering": sys.stderr.line_buffering, - } - if util.safehasattr(sys.stderr, "write_through"): - # pytype: disable=attribute-error - kwargs["write_through"] = sys.stderr.write_through - # pytype: enable=attribute-error - sys.stderr = io.TextIOWrapper( - sys.stderr.buffer, - sys.stderr.encoding, - sys.stderr.errors, - **kwargs - ) + if sys.stderr is not None: + kwargs = { + "newline": "\n", + "line_buffering": sys.stderr.line_buffering, + } + if util.safehasattr(sys.stderr, "write_through"): + # pytype: disable=attribute-error + kwargs["write_through"] = sys.stderr.write_through + # pytype: enable=attribute-error + sys.stderr = io.TextIOWrapper( + sys.stderr.buffer, sys.stderr.encoding, sys.stderr.errors, **kwargs + ) - if sys.stdin is not None: - # No write_through on read-only stream. - sys.stdin = io.TextIOWrapper( - sys.stdin.buffer, - sys.stdin.encoding, - sys.stdin.errors, - # None is universal newlines mode. - newline=None, - line_buffering=sys.stdin.line_buffering, - ) + if sys.stdin is not None: + # No write_through on read-only stream. + sys.stdin = io.TextIOWrapper( + sys.stdin.buffer, + sys.stdin.encoding, + sys.stdin.errors, + # None is universal newlines mode. + newline=None, + line_buffering=sys.stdin.line_buffering, + ) + - def _silencestdio(): - for fp in (sys.stdout, sys.stderr): - if fp is None: - continue - # Check if the file is okay - try: - fp.flush() - continue - except IOError: - pass - # Otherwise mark it as closed to silence "Exception ignored in" - # message emitted by the interpreter finalizer. - try: - fp.close() - except IOError: - pass - -else: - - def initstdio(): - for fp in (sys.stdin, sys.stdout, sys.stderr): - procutil.setbinary(fp) - - def _silencestdio(): - pass +def _silencestdio(): + for fp in (sys.stdout, sys.stderr): + if fp is None: + continue + # Check if the file is okay + try: + fp.flush() + continue + except IOError: + pass + # Otherwise mark it as closed to silence "Exception ignored in" + # message emitted by the interpreter finalizer. + try: + fp.close() + except IOError: + pass def _formatargs(args):