exthelper: simplify the ability to register revsets
I think this is what Yuya and Boris agreed on.[1] This happens *after* the
extsetup phase now (and after the _aftercallback notifications). But this is
trivial, mergeable between exthelper instances, and doesn't need to have the
extension name supplied when registering.
[1] https://www.mercurial-scm.org/pipermail/mercurial-devel/2018-December/125888.html
all: tutorials/tutorial.rst tutorials/topic-tutorial.rst static/logo-evolve.ico
sphinx-build . ../html/
tutorials/tutorial.rst: tutorials/tutorial.t test2rst.py
python test2rst.py tutorials/
tutorials/topic-tutorial.rst: tutorials/topic-tutorial.t test2rst.py
python test2rst.py tutorials/
static/logo-evolve.ico: static/logo-evolve.svg
convert -resize 36x36 static/logo-evolve.svg static/logo-evolve.ico