zf

zf is a fuzzy finder that excels at filtering filepaths:

• because filenames are usually unique, matches on filenames are prioritized
• when the query resembles a file path, zf uses heuristics for a more accurate match

While it also functions as a general-purpose fuzzy finder, the goal of zf is to be more accurate than other fuzzy finders when filtering filepaths. If you find something that could be improved, please let me know.

zf is also available as an allocation-free library for fuzzy filtering.

Try it online!

Demo

https://user-images.githubusercontent.com/7967463/225198950-a6ab568f-644f-40a1-b202-c12a35aeaed8.mp4

Features

• designed for fuzzy matching file paths (but also works as a general purpose fuzzy finder)
• refine search results with whitespace separated query terms
• case insensitive unless the query contains uppercase letters (smartcase)
• multiselect to output multiple selected lines
• Zig and C libraries for the zf ranking algorithm

zf aims to be simple:

• no full-window interface
• minimal config and options
• sensible defaults

Docs

• Usage Documentation
• Library Documentation

Why use zf?

zf was designed knowing that a frequent use case for fuzzy finders is filtering filepaths. It also works great for any arbitrary string, but it is especially good at filtering filepaths with precision.

Specifically,

• Matches on filenames are prioritized over filepath matches
• Matches on the beginning of a word are prioritized over matches in the middle of a word
• Non-sequential character matches are penalized
• Strict path matching offers even more precision

Here are some concrete examples.

Filename priority

The query is matched first on the filename and then on the path if the filename doesn't match. This example comes from Blender's source code, and was my original inspiration for designing zf.

> make
./GNUmakefile
./source/blender/makesdna/DNA_genfile.h
./source/blender/makesdna/intern/dna_genfile.c
./source/blender/makesrna/intern/rna_cachefile.c
./source/blender/makesdna/DNA_curveprofile_types.h

Fzf and fzy both rank source/blender/makesdna/DNA_genfile.h first in the results, with GNUmakefile 10 items down the list.

Space-separated tokens

But not every filename is unique. Sometimes there are codebases where there are many files with the same or similar names, like an __init__.py in Python, or .c and .h file pairs in C. In zf each space separated query term is used to narrow down the results. Imagine searching for an __init__.py file in a Python project.

> init
./__init__.py
./ui/__init__.py
./data/__init__.py
./config/__init__.py

At this point you can either move the selection down with Down or c-n to find ./config/__init__.py, or you can add a new token to the query string.

> init c
./config/__init__.py

Treating the query string as a sequence of tokens makes filtering more efficient.

Strict path matching

This feature is a "do what I mean" feature, more easily used than explained. When the query looks like a path (contains at least one path separator) strict path matching is enabled.

Path segments are the portions of a path delimited by path separators. foo/bar has segments foo and bar. With strict path matching the path segments of the query token must not span across path segments in the candidate. As an example, the query foo/ would match foo/bar/ but not fo/obar/ because the characters "foo" must appear in a single path segment.

This is useful for narrowing down results when you know the exact path structure of your files. With the following paths

./app/models/foo/bar/baz.rb
./app/models/foo/bar-baz.rb
./app/models/foo-bar-baz.rb
./app/monsters/dungeon/foo/bar/baz.rb

Strict path matching ensures that the intended path structure is found.

> a/m/f/b/baz
./app/models/foo/bar/baz.rb

In other fuzzy finders the string app/monsters/dungeon/foo/bar/baz.rb is also included in the results. Strict path matching prevents this because there is a slash between onsters/dungeon and nothing in the query matches the dungeon segment.

To end strict path matching, just add a space to start a new query token.

Installation

Arch Linux

An AUR package is available.

macOS

Install with Homebrew

brew install zf

Nix

nix-env --install zf

Binaries

Each release has binaries attached for macOS and Linux.

Building from source

For compatibility with system package managers, zf targets the latest stable release of Zig. The unstable branch is kept up to date with Zig master.

git clone https://github.com/natecraddock/zf
cd zf
zig build -Doptimize=ReleaseSafe --summary all

The executable will be created in ./zig-out/bin/zf. For debug builds omit -Doptimize=ReleaseSafe.

Integrations

Would you like to use zf in an editor? Try one of the following plugins

• zf.vim: zf integrated with vim for fuzzy file finding. Similar to fzf.vim.
• telescope-zf-native.nvim a neovim telescope extension to override the default Lua sorter with zf.

Contributing

I am open to contributions of all kinds, but be aware that I want to keep zf small and easy to maintain.