Excerpts from Yuya Nishihara's message of 2016-12-20 21:47:23 +0900:
> On Mon, 19 Dec 2016 16:32:16 +0000, Jun Wu wrote:
> > Excerpts from Yuya Nishihara's message of 2016-12-19 23:46:26 +0900:
> > > On Sun, 18 Dec 2016 18:24:45 +0000, Jun Wu wrote:
> > > > The direction is to eventually lose control on "ui" used in runcommand,
> > > > and
> > > > let dispatch construct a "ui" object on its own.
> > >
> > > I got it.
> > >
> > > > And we then use a special
> > > > "uisetup" which calls "wrapui" to modify the ui object created by
> > > > dispatch.
> > >
> > > Who will call this "uisetup"? dispatch or chgserver.runcommand?
> >
> > The plan is to add a "uisetup" argument to dispatch.request:
> >
> > diff --git a/mercurial/dispatch.py b/mercurial/dispatch.py
> > --- a/mercurial/dispatch.py
> > +++ b/mercurial/dispatch.py
> > @@ -49,5 +49,5 @@ from . import (
> > class request(object):
> > def __init__(self, args, ui=None, repo=None, fin=None, fout=None,
> > - ferr=None):
> > + ferr=None, uisetup=None):
> > self.args = args
> > self.ui = ui
> > @@ -59,4 +59,7 @@ class request(object):
> > self.ferr = ferr
> >
> > + # an extra uisetup unrelated to extensions, used by chg
> > + self.uisetup = uisetup
> > +
> > def run():
> > "run the command in sys.argv"
> > @@ -660,4 +663,9 @@ def _dispatch(req):
> > extensions.loadall(lui)
> > exts = [ext for ext in extensions.extensions() if ext[0] not in
> > _loaded]
> > +
> > + # An extra uisetup of the request, currently used by chg
> > + if req.uisetup is not None:
> > + req.uisetup(lui)
> > +
> > # Propagate any changes to lui.__class__ by extensions
> > ui.__class__ = lui.__class__
>
> Ah, that seems okay.
>
> BTW, is there any reason we have to delay the uisetup() call? I think we can
> just set req.ui in place of req.uisetup:
>
> class chgui(uimod.ui):
> ...
> req = dispatch.request(ui=chgui.load())
It's useful if runcommand needs to wrap on top of the side effects of other
extensions (ex. pager). In my WIP patch, chgcmdserver.uisetup looks like:
def _uisetup(self, ui):
_wrapui(ui, self._csystem)
try:
pager = extensions.find('pager')
except KeyError:
pass
else:
if util.safehasattr(pager, '_runpager'):
extensions.wrapfunction(pager, '_runpager', self._runpager)
def _runpager(self, orig, ui, pagercmd):
self._csystem.write(pagercmd, type='pager')
while True:
cmd = self.client.readline()[:-1]
_log('pager subcommand: %s' % cmd)
if cmd == 'attachio':
self.attachio(ui)
elif cmd == '':
break
else:
raise error.Abort(_('unexpected command %s') % cmd)
_runpager is coupled with chgcmdserver.
So uisetup is still necessary to wrap _runpager. The _wrapui change is
unnecessary if we use your proposal. In that case, both Patch 2 and 4 can be
dropped and Patch 1 and 3 are useful.
> > > I'm slightly afraid of modifying ui class in the middle of the server
> > > session
> > > since the ui might be used after runcommand(). That could lead to a
> > > subtle bug.
> >
> > I agree. So patch 4 should be deferred until the uisetup work is done. Since
> > that depends on a lot of other things. Patch 4 should be dropped now.
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