rhg: support "status FILE" This change adds a new [file] argument to rhg status, parses them as patterns, canonicalizes the paths, and constructs a new PatternMatcher to intersect with the existing matcher being passed to the status implementation. We also make filepatterns a public module so we can access the pattern-parsing functionality we need from commands/status.rs.

rust-matchers: add PatternMatcher This should match the behavior of the Python patternmatcher. We need this for status [FILES] support.

rust-status: only visit parts of the tree requested by the matcher This is an optimization that the matcher is designed to support, but we weren't doing it until now. This is primarily relevant for supporting "hg status [FILES]", where this optimization is crucial for getting good performance (without this optimization, that command will still scan the entire tree, and just filter it down after the fact). When this optimization fires we have to return false from traverse_fs_directory_and_dirstate, representing that that part of the tree *might* have new files which we didn't see because we skipped parts of it. This only affects the cached result of the status, and is necessary to make future status operations (which might use a different matcher) work properly.

rust-status: error on non-existent files in file_set file_set here consists of the files that were explicitly specified on the command line. Erroring on them matches the behavior of Python status.

rust-status: explicitly track bad file types Before this, we silently skipped bad file types. Now, we check to see if a path is an exact_match in our matcher, and if so, print an error for it, and only then do we skip it. A path will be an exact match when it's specified as an explicit command line argument, and this error-printing behavior is necessary for compatibility with Python status.

rust: de-hardcode glob_suffix We're adding patternmatcher in a subsequent commit, and this needs needs to be different for includematcher and patternmatcher.

rust: improve the type on DirsMultiset::from_manifest It could only return an HgPathError, but we didn't express this in the type, so we needed some unreachable!()s. Now that is expressed in the type.

rust: don't escape spaces in regex Spaces are not in fact a regex special character, and escaping them is not correct.

rust-filepatterns: also normalize RelPath These patterns should be normalized too; this at least does no harm, and is necessary for proper status support.

rust: simplify pattern file parsing Previously we kept the pattern syntax as a &[u8] until the last possible moment, which meant we had to handle potential errors when parsing that &[u8]. But such errors could never actually occur, given the structure of the code. Now we parse it eagerly (in two places) and pass it around as a PatternSyntax, so we can delete some error handling code. parse_one_pattern is in particular useful for parsing patterns passed on the command line, as we'll support later in this series.

rust-matchers: better support file_set in IntersectionMatcher Previously, if both of the input matchers had non-exact file sets, IntersectionMatcher would simply have an empty fileset. Now, we duplicate Python behavior: we *union* the filesets of the matchers in that case. This makes some sense, because without exact input file sets, we can't do an exact intersection and must over-approximate. Concretely, this is necessary because the file_set is the list of files that were explicitly listed by the user, and we want to provide explicit errors for all such files, from both matchers.

branching: merge stable into default

version: migrate `opts` to native kwargs

verify: migrate `opts` to native kwargs

tags: migrate `opts` to native kwargs

tag: migrate `opts` to native kwargs

summary: migrate `opts` to native kwargs This has the added benefit of unconfusing PyCharm- it thought `opts` in the nested functions were str based for some reason.

revert: migrate `opts` to native kwargs

rename: drop an unnecessary variable declaration at a wider scope

rename: migrate `opts` to native kwargs

remove: migrate `opts` to native kwargs

purge: migrate `opts` to native kwargs

pull: avoid referencing a variable before it is initialized If `urlutil.get_pull_paths()` somehow yields nothing, the reference after the loop appears to be a problem. I noticed this because PyCharm flagged (and still flags) the initialization of this inside the loop as somehow unused. I'm not sure why 1 isn't returned directly where it is set to the result of `postincoming()`, but maybe the code is structured this way in anticipation of future work.

pull: migrate `opts` to native kwargs

paths: migrate `opts` to native kwargs

merge: migrate `opts` to native kwargs

manifest: migrate `opts` to native kwargs

locate: migrate `opts` to native kwargs

import: migrate `opts` to native kwargs

heads: migrate `opts` to native kwargs

forget: migrate `opts` to native kwargs

copy: drop an unused variable