match: add `filepath:` pattern to match an exact filepath relative to the root
It's useful in certain automated workflows to make sure we recurse in
directories whose name conflicts with files in other revisions.
In addition it makes it possible to avoid building a potentially costly regex,
improving performance when the set of files to match explicitly is large.
The benchmark below are run in the following configuration :
# data-env-vars.name = mozilla-central-2018-08-01-zstd-sparse-revlog
# benchmark.name = files
# benchmark.variants.rev = tip
# benchmark.variants.files = all-list-filepath-sorted
# bin-env-vars.hg.flavor = no-rust
It also includes timings using the re2 engine (through the `google-re2` module)
to show how much can be saved by just using a better regexp engine.
Pattern time (seconds) time using re2
-----------------------------------------------------------
just "." 0.4 0.4
list of "filepath:…" 1.3 1.3
list of "path:…" 25.7 3.9
list of patterns 29.7 10.4
As you can see, Without re2, using "filepath:" instead of "path:" is a huge
win. With re2, it is still about three times faster to not have to build the
regex.
edition = "2018"
max_width = 79
wrap_comments = true
error_on_line_overflow = true