comparison mercurial/ui.py @ 40589:054d0fcba2c4

commandserver: add experimental option to use separate message channel

This is loosely based on the idea of the TortoiseHg's pipeui extension,
which attaches ui.label to message text so the command-server client can
capture prompt text, for example.

https://bitbucket.org/tortoisehg/thg/src/4.7.2/tortoisehg/util/pipeui.py

I was thinking that this functionality could be generalized to templating,
but changed mind as doing template stuff would be unnecessarily complex.
It's merely a status message, a simple serialization option should suffice.

Since this slightly changes the command-server protocol, it's gated by a
config knob. If the config is enabled, and if it's supported by the server,
"message-encoding: <name>" is advertised so the client can stop parsing
'o'/'e' channel data and read encoded messages from the 'm' channel. As we
might add new message encodings in future releases, client can specify a list
of encoding names in preferred order.

This patch includes 'cbor' encoding as example. Perhaps, 'json' should be
supported as well.

40588:9683dfb6f13a

        # opencode timeblockedsection because this is a critical path
        starttime = util.timer()
        try:
            if dest is self._ferr and not getattr(self._fout, 'closed', False):
                self._fout.flush()
            if self._colormode == 'win32':
                # windows color printing is its own can of crab, defer to
                # the color module and that is it.
                color.win32print(self, dest.write, msg, **opts)
            else:
                if self._colormode is not None:

def haveprogbar():
    return _progresssingleton is not None

def _selectmsgdests(ui):
    name = ui.config(b'ui', b'message-output')
    if name == b'stdio':
        return ui.fout, ui.ferr
    if name == b'stderr':
        return ui.ferr, ui.ferr
    raise error.Abort(b'invalid ui.message-output destination: %s' % name)

40589:054d0fcba2c4

        # opencode timeblockedsection because this is a critical path
        starttime = util.timer()
        try:
            if dest is self._ferr and not getattr(self._fout, 'closed', False):
                self._fout.flush()
            if getattr(dest, 'structured', False):
                # channel for machine-readable output with metadata, where
                # no extra colorization is necessary.
                dest.write(msg, **opts)
            elif self._colormode == 'win32':
                # windows color printing is its own can of crab, defer to
                # the color module and that is it.
                color.win32print(self, dest.write, msg, **opts)
            else:
                if self._colormode is not None:

def haveprogbar():
    return _progresssingleton is not None

def _selectmsgdests(ui):
    name = ui.config(b'ui', b'message-output')
    if name == b'channel':
        if ui.fmsg:
            return ui.fmsg, ui.fmsg
        else:
            # fall back to ferr if channel isn't ready so that status/error
            # messages can be printed
            return ui.ferr, ui.ferr
    if name == b'stdio':
        return ui.fout, ui.ferr
    if name == b'stderr':
        return ui.ferr, ui.ferr
    raise error.Abort(b'invalid ui.message-output destination: %s' % name)