keepsorted

cargo install keepsorted

• Documentation
• Source code
• Issue tracker
• Specs

Overview

keepsorted sorts lists of lines while keeping nearby comments with the lines that follow them. Add a comment like Keep sorted and the tool will reorder the next block. Some file types are sorted automatically.

Usage

keepsorted --check <path>   # verify without changes
keepsorted --diff <path>    # preview changes as a diff
keepsorted --fix <path>     # rewrite files in place (default)

Use --recursive (-r) to process directories. Combine with git ls-files in CI to check only tracked files. Binary files are skipped automatically.

Keywords

• Keep sorted or keepsorted: keep sorted – sort the next block.
• keepsorted: ignore file – skip the whole file.
• keepsorted: ignore block – skip a single block.

Markers work with #, //, or -- comments. Generic files and Bazel require one of these comments. Cargo.toml, .gitignore, and CODEOWNERS are sorted automatically when the matching feature flag is enabled.

Examples

Generic text (Python)

# Keep sorted
# comment B
b
# comment A
a

becomes

# Keep sorted
# comment A
a
# comment B
b

Generic text (C++)

// Keep sorted
// comment two
second
// comment one
first

becomes

// Keep sorted
// comment one
first
// comment two
second

Generic text (SQL/Lua)

-- Keep sorted
-- c comment
c
-- a comment
a

becomes

-- Keep sorted
-- a comment
a
-- c comment
c

Bazel

srcs = [
    # Keep sorted
    "b",
    # note for a
    "a",
]

becomes

srcs = [
    # Keep sorted
    # note for a
    "a",
    "b",
]

Cargo.toml

[dependencies]
b = "2"
a = "1"

# keepsorted: ignore block
[dev-dependencies]
z = "1"
y = "2"

becomes

[dependencies]
a = "1"
b = "2"

# keepsorted: ignore block
[dev-dependencies]
z = "1"
y = "2"

.gitignore

# Build
/b
/a

becomes

# Build
/a
/b

CODEOWNERS

# Team
b
# Lead
a

becomes

# Team
a
# Lead
b

Experimental features

The following features are behind flags because sorting might change behaviour:

• gitignore and codeowners – order matters, so enable with care.
• rust_derive_alphabetical and rust_derive_canonical – temporary helpers to reorder #[derive(...)] attributes. cargo fmt does not yet sort derives (rust-lang/rustfmt#6574). These features are hidden behind flags and only perform alphabetical or canonical ordering. Users have been requesting derive sorting since 2017, so keepsorted fills the gap for now. Consider upvoting the issue if you want built-in support.

Enable features with --features:

keepsorted file --features gitignore,rust_derive_canonical

Limitations

keepsorted intentionally does not:

• Handle advanced directory traversal or ignore rules automatically.
• Act as a full-fledged parser for every file type.
• Handle ignore files or exclude paths automatically.
• Automatically detect project structure or configuration files.
• Replace formatting tools like rustfmt or prettier.