interfaces: introduce and use a protocol class for the `charencoding` module
See
f2832de2a46c for details when this was done for the `bdiff` module.
This lets us dump the hack where the `pure` implementation was imported during
the type checking phase to provide signatures for the module methods it
provides. Now the protocol classes are starting to shine, because these methods
are provided by `pure.charencoding` and `cext.parsers`, and references to
`cffi.charencoding` and `cext.charencoding` are forwarded to them as appropriate
by the `policy` module. But none of that matters, as long as the module
returned provides the listed methods.
The interface was copy/pasted from the `pure` module, but `jsonescapeu8fallback`
is omitted because it is accessed from the `pure` module directly when the
escaping fails in the primary module's `jsonescapeu8()`.
$ cat << EOF >> $HGRCPATH
> [extensions]
> rebase=
> [alias]
> tglog = log -G -T "{rev} '{desc}'\n"
> EOF
$ hg init
$ echo a > a; hg add a; hg ci -m a
$ echo b > b; hg add b; hg ci -m b1
$ hg up 0 -q
$ echo b > b; hg add b; hg ci -m b2 -q
$ hg tglog
@ 2 'b2'
|
| o 1 'b1'
|/
o 0 'a'
With rewrite.empty-successor=skip, b2 is skipped because it would become empty.
$ hg rebase -s 2 -d 1 --config rewrite.empty-successor=skip --dry-run
starting dry-run rebase; repository will not be changed
rebasing 2:6e2aad5e0f3c tip "b2"
note: not rebasing 2:6e2aad5e0f3c tip "b2", its destination already has all its changes
dry-run rebase completed successfully; run without -n/--dry-run to perform this rebase
With rewrite.empty-successor=keep, b2 will be recreated although it became empty.
$ hg rebase -s 2 -d 1 --config rewrite.empty-successor=keep
rebasing 2:6e2aad5e0f3c tip "b2"
note: created empty successor for 2:6e2aad5e0f3c tip "b2", its destination already has all its changes
saved backup bundle to $TESTTMP/.hg/strip-backup/6e2aad5e0f3c-7d7c8801-rebase.hg
$ hg tglog
@ 2 'b2'
|
o 1 'b1'
|
o 0 'a'