tests/test-ui-color.py

wireprotov2: send content encoded frames from server

Now that we have support for negotiating encodings and configuring
an encoder, we can start sending content encoded frames from the
server.

This commit teaches the wireprotov2 server code to send content
encoded frames.

On the mozilla-unified repository with zstd enabled peers, this change
reduces the total amount of data transferred from server to client
drastically:

befor: 7,190,995,812 bytes
after: 1,605,508,691 bytes

Differential Revision: https://phab.mercurial-scm.org/D4927

from __future__ import absolute_import, print_function

import os
from mercurial import (
    dispatch,
    ui as uimod,
)
from mercurial.utils import (
    stringutil,
)

# ensure errors aren't buffered
testui = uimod.ui()
testui.pushbuffer()
testui.write((b'buffered\n'))
testui.warn((b'warning\n'))
testui.write_err(b'error\n')
print(stringutil.pprint(testui.popbuffer(), bprefix=True).decode('ascii'))

# test dispatch.dispatch with the same ui object
hgrc = open(os.environ["HGRCPATH"], 'wb')
hgrc.write(b'[extensions]\n')
hgrc.write(b'color=\n')
hgrc.close()

ui_ = uimod.ui.load()
ui_.setconfig(b'ui', b'formatted', b'True')

# we're not interested in the output, so write that to devnull
ui_.fout = open(os.devnull, 'wb')

# call some arbitrary command just so we go through
# color's wrapped _runcommand twice.
def runcmd():
    dispatch.dispatch(dispatch.request([b'version', b'-q'], ui_))

runcmd()
print("colored? %s" % (ui_._colormode is not None))
runcmd()
print("colored? %s" % (ui_._colormode is not None))