tests: add test for Rust formatting
We enforce formatting for Python and C. It makes sense to do it
for Rust as well.
Since our rustfmt.toml relies on unstable rustfmt features, we
need to use a Nightly rustfmt with --unstable-features in order
for it to work. This is a bit hacky and I would prefer we remove
this requirement. But for now, this commit assumes this is the
way things must be and we go out of our way to detect and use the
rustfmt from the "nightly" toolchain, as installed via rustup.
We had to add some environment variables to the tests to make
the Rust binaries happy. Otherwise when running rustfmt we get
an error about no default toolchain being installed.
Differential Revision: https://phab.mercurial-scm.org/D7579
== New Features ==
* New config `commands.commit.post-status` shows status after successful
commit.
* `hg root` now has templating support, including support for showing
where a repo share's source is. See `hg help -v root` for details.
* New `--force-close-branch` flag for `hg commit` to forcibly close
branch from a non-head changeset.
* The curses-based interface for commands like `hg commit -i` now supports
a range-select mechanism. Select the first line using space like before,
navigate to the last line, and press X (capital x) to set all items in
the range at once. Lowercase x has been added as a synonym for space to
help reinforce the mechanism, and pressing enter/return continues to be a
synonym for "toggle the current line and move down to the next item in
this section."
== New Experimental Features ==
* New config `experimental.log.topo` makes `hg log -G` use
topological sorting. This is especially useful for aliases since it
lets the alias accept an `-r` option while still using topological
sorting with or without the `-r` (unlike if you use the `sort(...,
topo)` revset).
== Bug Fixes ==
* issue4292: "hg log and {files} {file_adds} {file_mods} {file_dels}
in template show wrong files on merged revision". See details in
"Backwards Compatibility Changes".
== Backwards Compatibility Changes ==
* Removed (experimental) support for log graph lines mixing
parent/grandparent styles. Setting
e.g. `experimental.graphstyle.parent = !` and
`experimental.graphstyle.grandparent = 3.` would use `!` for the
first three lines of the graph and then `.`. This is no longer
supported.
* If `ui.origbackuppath` had been (incorrectly) configured to point
to a file, we will now replace that file by a directory and put
backups in that directory. This is similar to how we would
previously replace files *in* the configured directory by
subdirectories.
* Template keyword `{file_mods}`, `{file_adds}`, and `{file_dels}`
have changed behavior on merge commits. They used to be relative to
the first parent, but they now consider both parents. `{file_adds}`
shows files that exists in the commit but did not exist in either
parent. `{file_dels}` shows files that do not exist in the commit
but existed in either parent. `{file_mods}` show the remaining
files from `{files}` that were not in the other two
sets.
== Internal API Changes ==
* Matchers are no longer iterable. Use `match.files()` instead.
* `match.visitdir()` and `match.visitchildrenset()` now expect the
empty string instead of '.' to indicate the root directory.
* `util.dirs()` and `util.finddirs()` now include an entry for the
root directory (empty string).
* shelve is no longer an extension now. it will be turned on by default.
* New API to manage unfinished operations: Earlier there were distinct APIs
which dealt with unfinished states and separate lists maintaining them
that are `cmdutil.afterresolvestates`, `cmdutil.unfinishedstates` and
`cmdutil.STATES`. Now these have been unified to a single
API which handles the various states and their utilities. This API
has been added to `state.py`. Now instead of adding to these 3 lists
independently a state for a new operation can be registered using
`addunfinished()` in `state` module.
* `cmdutil.checkunfinished()` now includes detection for merge too.
* merge abort has been disallowed in case an operation of higher
precedence is in progress to avoid cases of partial abort of
operations.
* We used to automatically attempt to make extensions compatible with
Python 3 (by translating their source code while loading it). We no
longer do that.