feature(picker): score bonus for file extension prefix match

[jdrouhard]

Did you check the docs?

• I have read all the snacks.nvim docs

Is your feature request related to a problem? Please describe.

fzf assigns a score bonus for fully matched prefixes in the file extension, but it doesn't look like snacks.picker does this.

Example:

1. mkdir example && cd example
2. touch Foo.cpp Foo.hpp FooConfig.cpp
3. :lua Snacks.picker.files() vs :FzfLua files
4. type foocp

Compare the match. fzf matcher will select Foo.cpp since the "cp" is an exact prefix match of the extension. snacks selects FooConfig.cpp since the first "c" matches a longer prefix in the file name, but the last "p" is actually the second character of the extension.

Describe the solution you'd like

The behavior of fzf here is desirable. It lets me quickly type part of a file name and part of the extension I want and more than likely get the file I'm looking for. In my example, if I actually wanted the config file, I'd type "fooconfcp" or something, but I'd do it intentionally.

Describe alternatives you've considered

fzf

Additional context

No response

[folke]

fzf doesn't give bonusses for file extensions.
The reason FooConfig gets a higher score is due to the match with camelcase, which gets a bonus.

But I think I should only award a camelcase bonus for patterns starting at a camel-case position.

Will look into it.

[folke]

Found the issue. I didn't account for gaps in calculating the prev character class for transition bonusses.

[jdrouhard]

Thanks, that was fast! Though it doesn't quite work in all cases.

Add FooBar.cpp and FooBarConfig.cpp to the test dir, and then try to match it by typing "foobarcp" in the picker. It'll match "FooBarConfig.cpp" and not "FooBar.cpp" even though typing "foocp" will now correctly match "Foo.cpp".

@folke

[folke]

I made some additional changes to more align with fzf.
Let me know if you'd still see difference.

Snacks does also give bonusses for matches in the file name similar to zf, so that will always be different however.

[jdrouhard]

@folke, you're a true legend. This is now working perfectly!