The version that returns Merge<_> will be used in diff functions. The added
helper functions will also be used in order to apply word-level merging.
Since we cannot express FnOnce(impl IntoIterator<..>) where the argument type is
controlled by callee, this patch adds helper trait to bridge collect_*()
functions.
The CI seems to correctly use rustc 1.84.1 (and not 1.84.0) with this.
For reference, we last updated the MSRV to 1.76 in 5b517b5. According to
https://releases.rs/docs/1.76.0/, this was when it barely became stable.
`flake.nix` seems to be using a nightly toolchain now, so it seems there
is no need to update the version there.
The more precise clippy command used was:
cargo clippy --workspace --all-targets --fix
Not all callers need this information, but I assumed it's relatively cheap to
look up the source path in the target tree compared to diffing.
This could be represented as Regular(_)|Copied(_, _)|Renamed(_, _), but it's
a bit weird if Copied and Renamed were separate variants. Instead, I decided
to wrap copy metadata in Option.
This patch adds accessor methods as I'm going to change the underlying data
types. Since entry values are consumed separately, these methods are implemented
on CopiesTreeDiffEntryPath, not on *TreeDiffEntry.
I plan to provide a richer version of `TreeDiffEntry` with copy info
(and to make `TreeDiffEntry` itself "poorer"). Most callers want to
know about copies/renames, but at least working copy implementations
probably don't. This patch adds separate `diff_stream()` and
`diff_stream_with_copies()` so we can provide the simpler interface
for callers that don't need copy info.
The support for copy tracing is already simply added to the stream
just before yielding the item, so we can easily implement it as a
stream adapter. That ensures that we use the same logic for the
iterator- and stream-based versions. More importantly, it enables
further cleanups and a simpler interface.
MergedTreeVal was roughly equivalent to Merge<Option<Cow<_>>. As we've dropped
support for the legacy trees, it can be simplified to Merge<Option<&_>>.
- force each diff command to explicitly enable copy tracking
- enable copy tracking in diff_summary
- post-process for diff iterator
- post-process for diff stream
- update changelog
I considered making `MergedTree` just a newtype (1-tuple) but I went
with a struct instead because we may want to add copy information in a
separate field in the future.
As we discovered in the `jj fix` tests,
`MergedTreeBuilder::write_tree()` doesn't try to resolve conflicts,
not even trivial ones. This patch fixes that.
I think this is a variant of the problem fixed by 7fda80fc2221 "tree: simplify
conflict before resolving at hunk level." We need to simplify() the conflict
before and after extracting file ids because the source conflict values may
contain trees to be cancelled out, and the file values may differ only in exec
bits. Since the legacy tree passes a simplified conflict in to this function,
I made the merged tree do the same.
Fixes#2654
Otherwise an empty subtree would be added to the parent tree.
If the stored tree contained an empty subtree, simplify() wouldn't work
against new "absent" subtree representation. I don't know if there's a
such code path, but I believe it's very rare to encounter the problem.
#2654
This enables cheap str-to-RepoPath cast, which is useful when sorting and
filtering a large Vec<(String, _)> list by using matcher for example. It
will also eliminate temporary allocation by repo_path.parent().
This is a step towards introducing a borrowed RepoPath type. The current
RepoPath type is inefficient as each component String is usually short. We
could apply short-string optimization, but still each inlined component would
consume 24 bytes just for e.g. "src", and increase the chance of random memory
access. If the owned RepoPath type is backed by String, we can implement cheap
cast from &str to borrowed &RepoPath type.
