Support `Julia` language by fllesser · Pull Request #1519 · j178/prek

fllesser · 2026-02-01T04:24:25Z

resolve #1446

codecov · 2026-02-01T04:26:43Z

Codecov Report

❌ Patch coverage is 98.21429% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.02%. Comparing base (1808e0f) to head (6192892).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
crates/prek/src/languages/julia.rs	98.13%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1519      +/-   ##
==========================================
+ Coverage   91.98%   92.02%   +0.03%     
==========================================
  Files          88       89       +1     
  Lines       18374    18500     +126     
==========================================
+ Hits        16901    17024     +123     
- Misses       1473     1476       +3

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update docs and ci tweak tweak Addd lang-julia profile order

prek-ci-bot · 2026-02-01T04:48:13Z

📦 Cargo Bloat Comparison

Binary size change: +0.00% (22.6 MiB → 22.6 MiB)

Expand for cargo-bloat output

Head Branch Results

 File  .text    Size           Crate Name
 0.3%   0.8% 77.0KiB           prek? <prek::cli::Command as clap_builder::derive::Subcommand>::augment_subcommands
 0.3%   0.8% 70.3KiB            prek prek::languages::<impl prek::config::Language>::run::{{closure}}::{{closure}}
 0.3%   0.7% 65.1KiB            prek prek::languages::<impl prek::config::Language>::run::{{closure}}::{{closure}}
 0.2%   0.5% 50.8KiB            prek prek::languages::<impl prek::config::Language>::install::{{closure}}
 0.2%   0.5% 43.9KiB            prek prek::run::{{closure}}
 0.2%   0.5% 43.4KiB            prek prek::identify::by_extension::{{closure}}
 0.2%   0.4% 41.5KiB            prek prek::cli::run::run::run::{{closure}}
 0.1%   0.3% 32.0KiB           prek? <prek::cli::RunArgs as clap_builder::derive::Args>::augment_args
 0.1%   0.2% 22.1KiB            prek prek::hooks::meta_hooks::MetaHooks::run::{{closure}}
 0.1%   0.2% 22.1KiB            prek prek::hooks::meta_hooks::MetaHooks::run::{{closure}}
 0.1%   0.2% 21.2KiB    clap_builder clap_builder::parser::parser::Parser::get_matches_with
 0.1%   0.2% 20.0KiB cargo_metadata? <cargo_metadata::_::<impl serde_core::de::Deserialize for cargo_metadata::Package>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map
 0.1%   0.2% 19.6KiB            prek prek::archive::unzip::{{closure}}
 0.1%   0.2% 19.5KiB            prek prek::cli::run::filter::collect_files_from_args::{{closure}}
 0.1%   0.2% 19.3KiB             std core::ptr::drop_in_place<prek::languages::<impl prek::config::Language>::install::{{closure}}>
 0.1%   0.2% 19.3KiB            prek <prek::languages::ruby::ruby::Ruby as prek::languages::LanguageImpl>::install::{{closure}}
 0.1%   0.2% 19.1KiB            prek prek::cli::run::filter::collect_files_from_args::{{closure}}
 0.1%   0.2% 18.6KiB            ring ring_core_0_17_14__x25519_ge_frombytes_vartime
 0.1%   0.2% 18.1KiB       [Unknown] fe_loose_invert
 0.1%   0.2% 18.1KiB      hyper_util hyper_util::client::legacy::client::Client<C,B>::send_request::{{closure}}
36.8%  91.3%  8.3MiB                 And 20083 smaller methods. Use -n N to show more.
40.3% 100.0%  9.1MiB                 .text section size, the file size is 22.6MiB

Base Branch Results

 File  .text    Size           Crate Name
 0.3%   0.8% 72.1KiB           prek? <prek::cli::Command as clap_builder::derive::Subcommand>::augment_subcommands
 0.3%   0.7% 66.3KiB            prek prek::languages::<impl prek::config::Language>::run::{{closure}}::{{closure}}
 0.3%   0.7% 61.2KiB            prek prek::languages::<impl prek::config::Language>::run::{{closure}}::{{closure}}
 0.2%   0.5% 46.0KiB            prek prek::languages::<impl prek::config::Language>::install::{{closure}}
 0.2%   0.5% 43.4KiB            prek prek::identify::by_extension::{{closure}}
 0.2%   0.5% 43.2KiB            prek prek::run::{{closure}}
 0.2%   0.4% 41.7KiB            prek prek::cli::run::run::run::{{closure}}
 0.1%   0.3% 31.8KiB           prek? <prek::cli::RunArgs as clap_builder::derive::Args>::augment_args
 0.1%   0.2% 22.1KiB            prek prek::hooks::meta_hooks::MetaHooks::run::{{closure}}
 0.1%   0.2% 22.1KiB            prek prek::hooks::meta_hooks::MetaHooks::run::{{closure}}
 0.1%   0.2% 21.2KiB    clap_builder clap_builder::parser::parser::Parser::get_matches_with
 0.1%   0.2% 20.6KiB            prek prek::archive::unzip::{{closure}}
 0.1%   0.2% 20.0KiB cargo_metadata? <cargo_metadata::_::<impl serde_core::de::Deserialize for cargo_metadata::Package>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map
 0.1%   0.2% 19.5KiB            prek prek::cli::run::filter::collect_files_from_args::{{closure}}
 0.1%   0.2% 19.3KiB            prek <prek::languages::ruby::ruby::Ruby as prek::languages::LanguageImpl>::install::{{closure}}
 0.1%   0.2% 19.1KiB            prek prek::cli::run::filter::collect_files_from_args::{{closure}}
 0.1%   0.2% 19.0KiB             std core::ptr::drop_in_place<prek::languages::<impl prek::config::Language>::install::{{closure}}>
 0.1%   0.2% 18.6KiB            ring ring_core_0_17_14__x25519_ge_frombytes_vartime
 0.1%   0.2% 18.1KiB       [Unknown] fe_loose_invert
 0.1%   0.2% 18.1KiB      hyper_util hyper_util::client::legacy::client::Client<C,B>::send_request::{{closure}}
36.8%  91.4%  8.3MiB                 And 20038 smaller methods. Use -n N to show more.
40.3% 100.0%  9.1MiB                 .text section size, the file size is 22.6MiB

fllesser · 2026-02-01T05:26:08Z

I haven't added the remote hook test yet. Once you've forked the repository (https://github.com/fllesser/julia-hooks), I will push the test cases @j178

j178 · 2026-02-01T05:58:16Z

Forked https://github.com/prek-test-repos/julia-hooks! Also invited you as a member to prek-test-repos.

Co-authored-by: Jo <10510431+j178@users.noreply.github.com>

Copilot

Pull request overview

This PR adds support for the Julia language to prek, implementing a new language handler that allows hooks written in Julia to be installed and executed. The implementation follows established patterns from other language implementations like Haskell and Lua.

Changes:

Added Julia language support with isolated environment management using Julia's Pkg package manager
Integrated Julia throughout the codebase including schema, configuration, documentation, tests, and CI/CD
Fixed alphabetical ordering of language enums (moved Pygrep before Swift)

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
`prek.schema.json`	Added Julia to language schema and default_language_version in alphabetical order
`docs/languages.md`	Added Julia documentation describing installation, features, and limitations
`docs/cli.md`	Updated CLI documentation to include Julia in language list
`crates/prek/src/languages/julia.rs`	New Julia language implementation with install, health check, and run methods
`crates/prek/src/languages/mod.rs`	Integrated Julia language handler into the languages module
`crates/prek/src/config.rs`	Added Julia to Language enum with proper alphabetical ordering
`crates/prek/tests/languages/julia.rs`	Comprehensive test suite for Julia hooks covering local, remote, script file, and dependency scenarios
`crates/prek/tests/languages/main.rs`	Added Julia test module
`.github/workflows/ci.yml`	Added Julia installation step and version configuration for CI
`.config/nextest.toml`	Added Julia test profile configuration

j178 · 2026-02-01T08:13:51Z

Thanks!

This MR contains the following updates: | Package | Update | Change | |---|---|---| | [prek](https://github.com/j178/prek) | patch | `0.3.1` → `0.3.13` | MR created with the help of [el-capitano/tools/renovate-bot](https://gitlab.com/el-capitano/tools/renovate-bot). **Proposed changes to behavior should be submitted there as MRs.** --- ### Release Notes <details> <summary>j178/prek (prek)</summary> ### [`v0.3.13`](https://github.com/j178/prek/blob/HEAD/CHANGELOG.md#0313) [Compare Source](j178/prek@v0.3.12...v0.3.13) Released on 2026-05-06. ##### Bug fixes - Respect hook filters for message files ([#2049](j178/prek#2049)) ##### Documentation - Add Godot Engine to users in README ([#2047](j178/prek#2047)) ##### Contributors - [@j178](https://github.com/j178) - [@Calinou](https://github.com/Calinou) ### [`v0.3.12`](https://github.com/j178/prek/blob/HEAD/CHANGELOG.md#0312) [Compare Source](j178/prek@v0.3.11...v0.3.12) Released on 2026-05-05. ##### Highlights `auto_update.cooldown_days` is now available in both the user-level global config (`~/.config/prek/prek.toml` on Linux and macOS, or `$XDG_CONFIG_HOME/prek/prek.toml` when set; `%APPDATA%\prek\prek.toml` on Windows) and project config. Set a user default for `prek auto-update`, then override it per project when a repository needs a different update cadence. ```toml [auto_update] cooldown_days = 7 ``` ##### Enhancements - Add global auto-update cooldown config ([#2041](j178/prek#2041)) - Add project auto-update cooldown config ([#2044](j178/prek#2044)) - Support `language: dart` ([#1146](j178/prek#1146)) ##### Bug fixes - Pass commit message file to workspace hooks ([#2043](j178/prek#2043)) - Preserve non-UTF8 filenames from git ([#2023](j178/prek#2023)) - ruby: put resolved Ruby's bin dir on `$PATH` for `gem` invocations ([#2021](j178/prek#2021)) ##### Documentation - Update docs with the new logo and icon ([#2025](j178/prek#2025)) - Point schema docs to SchemaStore ([#2039](j178/prek#2039)) ##### Contributors - [@j178](https://github.com/j178) - [@xiaoyanli-lyft](https://github.com/xiaoyanli-lyft) - [@Lutra-Fs](https://github.com/Lutra-Fs) ### [`v0.3.11`](https://github.com/j178/prek/blob/HEAD/CHANGELOG.md#0311) [Compare Source](j178/prek@v0.3.10...v0.3.11) Released on 2026-04-27. ##### Highlights Hook entries now have an explicit `shell` option for shell snippets. Set `shell: sh`, `bash`, `pwsh`, `powershell`, or `cmd` when an entry should be evaluated by that shell; leaving it unset keeps prek's direct argv execution. `prek auto-update` can now filter tag candidates before choosing an update. Both options take glob patterns: use `--include-tag` to only consider matching tag names, and `--exclude-tag` to skip matching tags such as moving tags or prereleases. ##### Enhancements - Add `auto-update --exclude-repo <repo>` to skip repos ([#1983](j178/prek#1983)) - Add `auto-update --exit-code` to exit with non-zero on updates ([#2002](j178/prek#2002)) - Add `auto-update --include-tag <pattern>`/`--exclude-tag <pattern>` to filter tags ([#1984](j178/prek#1984)) - Adds an explicit `shell` hook option for entries that should run as shell source ([#2004](j178/prek#2004)) - Make `--hook-dir` optional for hook-impl ([#1989](j178/prek#1989)) - Skip shim warning when `--script-version` is missing ([#1990](j178/prek#1990)) ##### Bug fixes - Install Ruby executable in gem bin ([#2017](j178/prek#2017)) - Use dedicated Android npm package ([#1982](j178/prek#1982)) - Use stable repo keys without breaking cached clones ([#1995](j178/prek#1995)) ##### Documentation - Explain prek name ([#1980](j178/prek#1980)) - Clarify `pass_filenames` concurrency docs ([#1999](j178/prek#1999)) - Reorganize documentation references ([#2005](j178/prek#2005)) - Clarify hook author manifest env docs ([#1991](j178/prek#1991)) - docs: add Sentry to users list ([#1981](j178/prek#1981)) ##### Contributors - [@j178](https://github.com/j178) ### [`v0.3.10`](https://github.com/j178/prek/blob/HEAD/CHANGELOG.md#0310) [Compare Source](j178/prek@v0.3.9...v0.3.10) Released on 2026-04-21. ##### Enhancements - Disallow rev for non-remote repos in schema ([#1964](j178/prek#1964)) - Hide up-to-date output in non-verbose mode ([#1942](j178/prek#1942)) - Improve merge conflict marker detection ([#1937](j178/prek#1937)) - Keep finished hooks visible ([#1967](j178/prek#1967)) - Preserve frozen comment spacing in auto-update ([#1945](j178/prek#1945)) - Reimplement `@j178/prek` npm package ([#1973](j178/prek#1973)) ##### Bug fixes - Prefer stable Rust toolchains ([#1974](j178/prek#1974)) ##### Documentation - Add `SKILL.md` for prek ([#1950](j178/prek#1950)) - Document `gh skill install j178/prek prek` to install prek skill for agents ([#1951](j178/prek#1951)) - Improve compatibility and migration docs ([#1940](j178/prek#1940)) ##### Other changes - Sync latest identify tags ([#1947](j178/prek#1947)) ##### Contributors - [@github-actions](https://github.com/github-actions) - [@renovate](https://github.com/renovate) - [@j178](https://github.com/j178) ### [`v0.3.9`](https://github.com/j178/prek/blob/HEAD/CHANGELOG.md#039) [Compare Source](j178/prek@v0.3.8...v0.3.9) Released on 2026-04-13. ##### Highlight `prek auto-update` is now stricter about pinned revisions and more useful in CI. It now keeps `rev` and `# frozen:` comments in sync, can detect [impostor commits](https://docs.zizmor.sh/audits/#impostor-commit) when validating pinned SHAs, and lets you use `prek auto-update --check` to fail on both available updates and frozen-ref mismatches without rewriting the config. Examples: ```console $ prek auto-update # updates revs and repairs stale `# frozen:` comments $ prek auto-update --freeze # writes frozen SHAs with matching `# frozen: <tag>` comments $ prek auto-update --check # exits non-zero when updates are available, a `# frozen:` comment is stale, # or a pinned SHA does not belong to the fetched upstream refs ``` ##### Enhancements - Check and sync frozen comments during auto-update ([#1896](j178/prek#1896)) - Handle impostor commits in auto-update ([#1919](j178/prek#1919)) - Add experimental `language: dotnet` support ([#1871](j178/prek#1871)) - Honor repo and worktree `core.hooksPath` ([#1892](j178/prek#1892)) - Add `prek run --no-fail-fast` to override config file ([#1859](j178/prek#1859)) - Add `forbid-new-submodules` as builtin hook ([#1853](j178/prek#1853)) - Clean stale patch files in `cache gc` ([#1877](j178/prek#1877)) - Display auto-update results by config entry ([#1922](j178/prek#1922)) - Restrict patch directory permissions ([#1876](j178/prek#1876)) - Show tag names in `auto-update --freeze` output ([#1916](j178/prek#1916)) - Use a bitset for hook stages ([#1860](j178/prek#1860)) ##### Bug fixes - Canonicalize CWD and GIT\_ROOT paths ([#1878](j178/prek#1878)) - Ensure quotes are added for non-string revisions in `auto-update` ([#1936](j178/prek#1936)) ##### Documentation - Update docs for case of hooks modifying files with a non-zero exit code ([#1879](j178/prek#1879)) ##### Contributors - [@RicardoVercetti](https://github.com/RicardoVercetti) - [@nathanjmcdougall](https://github.com/nathanjmcdougall) - [@renovate](https://github.com/renovate) - [@sadjow](https://github.com/sadjow) - [@j178](https://github.com/j178) ### [`v0.3.8`](https://github.com/j178/prek/blob/HEAD/CHANGELOG.md#038) [Compare Source](j178/prek@v0.3.6...v0.3.8) Released on 2026-03-23. ##### Enhancements - Add experimental `language: deno` support ([#1516](j178/prek#1516)) - Add `pretty-format-json` as builtin hook ([#915](j178/prek#915)) - Add `check-vcs-permalinks` as builtin hook ([#1842](j178/prek#1842)) - Add `check-illegal-windows-names` as builtin hook ([#1841](j178/prek#1841)) - Add `check-shebang-scripts-are-executable` builtin hook ([#1847](j178/prek#1847)) - Add `destroyed-symlinks` builtin hook ([#1851](j178/prek#1851)) - Add `file-contents-sorter` as builtin hook ([#1846](j178/prek#1846)) - Add `--all` flag to `prek uninstall` ([#1817](j178/prek#1817)) - Improve file pattern parse errors ([#1829](j178/prek#1829)) - Validate `uv` binary after download ([#1825](j178/prek#1825)) ##### Bug fixes - Fix workspace-relative added file paths ([#1852](j178/prek#1852)) - Relax alias-anchor ratio check for check-yaml ([#1839](j178/prek#1839)) ##### Contributors - [@j178](https://github.com/j178) - [@shaanmajid](https://github.com/shaanmajid) - [@mvanhorn](https://github.com/mvanhorn) - [@feliblo](https://github.com/feliblo) - [@Tiryoh](https://github.com/Tiryoh) ### [`v0.3.6`](https://github.com/j178/prek/blob/HEAD/CHANGELOG.md#036) [Compare Source](j178/prek@v0.3.5...v0.3.6) Released on 2026-03-16. ##### Enhancements - Allow selectors for hook ids containing colons ([#1782](j178/prek#1782)) - Rename `prek install-hooks` to `prek prepare-hooks` and `prek install --install-hooks` to `prek install --prepare-hooks` ([#1766](j178/prek#1766)) - Retry auth-failed repo clones with terminal prompts enabled ([#1761](j178/prek#1761)) ##### Performance - Optimize `detect_private_key` by chunked reading and using aho-corasick ([#1791](j178/prek#1791)) - Optimize `fix_byte_order_marker` by shifting file contents in place ([#1790](j178/prek#1790)) ##### Bug fixes - Align stage defaulting behavior with pre-commit ([#1788](j178/prek#1788)) - Make sure child output is drained in the PTY subprocess ([#1768](j178/prek#1768)) - fix(golang): use `GOTOOLCHAIN=local` when probing system go ([#1797](j178/prek#1797)) ##### Documentation - Disambiguate “hook” terminology by renaming "Git hooks" to "Git shims" ([#1776](j178/prek#1776)) - Document compatibility with pre-commit ([#1767](j178/prek#1767)) - Update configuration.md with TOML 1.1 notes ([#1764](j178/prek#1764)) ##### Other changes - Sync latest identify tags ([#1798](j178/prek#1798)) ##### Contributors - [@github-actions](https://github.com/github-actions) - [@j178](https://github.com/j178) - [@pcastellazzi](https://github.com/pcastellazzi) - [@deadnews](https://github.com/deadnews) - [@copilot-swe-agent](https://github.com/copilot-swe-agent) ### [`v0.3.5`](https://github.com/j178/prek/blob/HEAD/CHANGELOG.md#035) [Compare Source](j178/prek@v0.3.4...v0.3.5) Released on 2026-03-09. ##### Enhancements - Add automatic Ruby download support using rv binaries ([#1668](j178/prek#1668)) - Adjust open file limit on process startup ([#1705](j178/prek#1705)) - Allow parallel gem retry ([#1732](j178/prek#1732)) - Enable system-proxy feature on reqwest ([#1738](j178/prek#1738)) - Expose `--git-dir` to force hook installation target ([#1723](j178/prek#1723)) - Pass `--quiet`, `--verbose`, and `--no-progress` through `prek install` into generated hook scripts ([#1753](j178/prek#1753)) - Respect `core.sharedRepository` for hook permissions ([#1755](j178/prek#1755)) - Support legacy mode hook script ([#1706](j178/prek#1706)) - rust: support `cli:` git dependency 4th segment package disambiguation ([#1747](j178/prek#1747)) ##### Bug fixes - Fix Python `__main__.py` entry ([#1741](j178/prek#1741)) - python: strip `UV_SYSTEM_PYTHON` from `uv venv` and `pip install` commands ([#1756](j178/prek#1756)) ##### Other changes - Sync latest identify tags ([#1733](j178/prek#1733)) ##### Contributors - [@Dev-iL](https://github.com/Dev-iL) - [@tennox](https://github.com/tennox) - [@shaanmajid](https://github.com/shaanmajid) - [@is-alnilam](https://github.com/is-alnilam) - [@github-actions](https://github.com/github-actions) - [@j178](https://github.com/j178) ### [`v0.3.4`](https://github.com/j178/prek/blob/HEAD/CHANGELOG.md#034) [Compare Source](j178/prek@v0.3.3...v0.3.4) Released on 2026-02-28. ##### Enhancements - Allow `pass_filenames` to accept a positive integer ([#1698](j178/prek#1698)) - Install and compile gems in parallel ([#1674](j178/prek#1674)) - Sync identify file-type mappings with pre-commit identify ([#1660](j178/prek#1660)) - Use `--locked` for Rust `cargo install` commands ([#1661](j178/prek#1661)) - Add `PREK_MAX_CONCURRENCY` environment variable for configuring maximum concurrency ([#1697](j178/prek#1697)) - Add `PREK_LOG_TRUNCATE_LIMIT` environment variable for configuring log truncation ([#1679](j178/prek#1679)) - Add support for `python -m prek` ([#1686](j178/prek#1686)) ##### Bug fixes - Skip invalid Rust toolchains instead of failing ([#1699](j178/prek#1699)) ##### Performance - Bitset-based TagSet refactor: precompute tag masks and speed up hook type filtering ([#1665](j178/prek#1665)) ##### Documentation - Document `winget install j178.Prek` ([#1670](j178/prek#1670)) ##### Contributors - [@uplsh580](https://github.com/uplsh580) - [@Svecco](https://github.com/Svecco) - [@dbast](https://github.com/dbast) - [@drichardson](https://github.com/drichardson) - [@JP-Ellis](https://github.com/JP-Ellis) - [@j178](https://github.com/j178) - [@is-alnilam](https://github.com/is-alnilam) - [@copilot-swe-agent](https://github.com/copilot-swe-agent) ### [`v0.3.3`](https://github.com/j178/prek/blob/HEAD/CHANGELOG.md#033) [Compare Source](j178/prek@v0.3.2...v0.3.3) Released on 2026-02-15. ##### Enhancements - Read Python version specifier from hook repo `pyproject.toml` ([#1596](j178/prek#1596)) - Add `#:schema` directives to generated prek.toml ([#1597](j178/prek#1597)) - Add `prek util list-builtins` command ([#1600](j178/prek#1600)) - Expand install source detection to `mise`, `uv tool`, `pipx`, and `asdf` ([#1605](j178/prek#1605), [#1607](j178/prek#1607)) - Add progress bar to `cache clean` and show removal summary ([#1616](j178/prek#1616)) - Make `yaml-to-toml` CONFIG argument optional ([#1593](j178/prek#1593)) - `prek uninstall` removes legacy scripts too ([#1622](j178/prek#1622)) ##### Bug fixes - Fix underflow when formatting summary output ([#1626](j178/prek#1626)) - Match `files/exclude` filter against relative path of nested project ([#1624](j178/prek#1624)) - Select `musllinux` wheel tag for uv on musl-based distros ([#1628](j178/prek#1628)) ##### Documentation - Clarify `prek list` description ([#1604](j178/prek#1604)) ##### Contributors - [@ichoosetoaccept](https://github.com/ichoosetoaccept) - [@shaanmajid](https://github.com/shaanmajid) - [@soraxas](https://github.com/soraxas) - [@9999years](https://github.com/9999years) - [@j178](https://github.com/j178) ### [`v0.3.2`](https://github.com/j178/prek/blob/HEAD/CHANGELOG.md#032) [Compare Source](j178/prek@v0.3.1...v0.3.2) Released on 2026-02-06. ##### Highlights - **`prek.toml` is here!** You can now use `prek.toml` as an alternative to `.pre-commit-config.yaml` for configuring prek. `prek.toml` mirrors the structure of `.pre-commit-config.yaml`, but TOML is less error-prone. Your existing `.pre-commit-config.yaml` will continue to work, but for new users and new projects, `prek.toml` may make more sense. If you want to switch, run `prek util yaml-to-toml` to convert YAML configs to `prek.toml`. See [configuration docs](configuration.md) for details. For example, this config: ```yaml repos: - repo: https://github.com/pre-commit/pre-commit-hooks rev: v6.0.0 hooks: - id: check-yaml ``` Can be written as `prek.toml` like this: ```toml [[repos]] repo = "https://github.com/pre-commit/pre-commit-hooks" rev = "v6.0.0" hooks = [ { id = "check-yaml" } ] ``` - **`serde-yaml` has been replaced with `serde-saphyr`** We replaced the long-deprecated `serde-yaml` crate with [`serde-saphyr`](https://crates.io/crates/serde-saphyr) for YAML parsing. It is written in safe Rust and has better error messages, performance, and security. This lets us provide precise location information for configuration parsing errors, which should make it easier to fix config issues. For example, this invalid config: ```yaml repos: - repo: https://github.com/crate-ci/typos hooks: - id: typos ``` Before: ```console $ prek run error: Failed to parse `.pre-commit-config.yaml` caused by: Invalid remote repo: missing field `rev` ``` Now: ```console $ prek run error: Failed to parse `.pre-commit-config.yaml` caused by: error: line 2 column 5: missing field `rev` at line 2, column 5 --> <input>:2:5 | 1 | repos: 2 | - repo: https://github.com/crate-ci/typos | ^ missing field `rev` at line 2, column 5 3 | hooks: 4 | - id: typos | ``` - **`prek util` subcommands** We added a new `prek util` top-level command for miscellaneous utilities that don't fit into other categories. The first two utilities are: - `prek util identify`: shows the identification tags of files that prek uses for file filtering, which can be useful for debugging and writing `types/types_or/exclude_types` filters. - `prek util yaml-to-toml`: converts `.pre-commit-config.yaml` to `prek.toml`. We also moved `prek init-template-dir` under `prek util` for better organization. The old `prek init-template-dir` command is still available (hidden) as an alias for backward compatibility. ##### Enhancements - Add `prek util identify` subcommand ([#1554](j178/prek#1554)) - Add `prek util yaml-to-toml` to convert `.pre-commit-config.yaml` to `prek.toml` ([#1584](j178/prek#1584)) - Detect install source for actionable upgrade hints ([#1540](j178/prek#1540)) - Detect prek installed by the standalone installer ([#1545](j178/prek#1545)) - Implement `serialize_yaml_scalar` using `serde-saphyr` ([#1534](j178/prek#1534)) - Improve max cli arguments length calculation ([#1518](j178/prek#1518)) - Move `identify` and `init-template-dir` under the `prek util` top-level command ([#1574](j178/prek#1574)) - Replace serde-yaml with serde-saphyr (again) ([#1520](j178/prek#1520)) - Show precise location for config parsing error ([#1530](j178/prek#1530)) - Support `Julia` language ([#1519](j178/prek#1519)) - Support `prek.toml` ([#1271](j178/prek#1271)) - Added `PREK_QUIET` environment variable support ([#1513](j178/prek#1513)) - Remove upper bound constraint of uv version ([#1588](j178/prek#1588)) ##### Bug fixes - Do not make the child a session leader ([#1586](j178/prek#1586)) - Fix FilePattern schema to accept plain strings ([#1564](j178/prek#1564)) - Use semver fallback sort when tag timestamps are equal ([#1579](j178/prek#1579)) ##### Documentation - Add `OpenClaw` to the list of users ([#1517](j178/prek#1517)) - Add `cachix/devenv`, `apache/lucene`, `copper-project/copper-rs` as projects using prek ([#1531](j178/prek#1531), [#1514](j178/prek#1514), [#1569](j178/prek#1569)) - Add document about authoring remote hooks ([#1571](j178/prek#1571)) - Add `llms.txt` generation for LLM-friendly documentation ([#1553](j178/prek#1553)) - Document using `--refresh` to pick up `.prekignore` changes ([#1575](j178/prek#1575)) - Fix PowerShell completion instruction syntax ([#1568](j178/prek#1568)) - Update quick start to use `prek.toml` ([#1576](j178/prek#1576)) ##### Other changes - Include `prek.toml` in run hint for config filename ([#1578](j178/prek#1578)) ##### Contributors - [@fatelei](https://github.com/fatelei) - [@domenkozar](https://github.com/domenkozar) - [@makeecat](https://github.com/makeecat) - [@fllesser](https://github.com/fllesser) - [@j178](https://github.com/j178) - [@copilot-swe-agent](https://github.com/copilot-swe-agent) - [@oopscompiled](https://github.com/oopscompiled) - [@rmuir](https://github.com/rmuir) - [@shaanmajid](https://github.com/shaanmajid) </details> --- ### Configuration 📅 **Schedule**: (UTC) - Branch creation - At any time (no schedule defined) - Automerge - At any time (no schedule defined) 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this MR and you won't be reminded about this update again. --- - [ ] If you want to rebase/retry this MR, check this box --- This MR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate).

fllesser marked this pull request as draft February 1, 2026 04:24

fllesser force-pushed the julia branch from 7a9cafe to 454b79d Compare February 1, 2026 04:31

Support Julia language

6320521

update docs and ci tweak tweak Addd lang-julia profile order

fllesser force-pushed the julia branch from 454b79d to 6320521 Compare February 1, 2026 04:32

generate schema and cli reference

149a82f

Tweaks

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j178 force-pushed the julia branch from 3d0feab to 0197e1b Compare February 1, 2026 05:28

Add remote hook test

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Update docs/languages.md

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Co-authored-by: Jo <10510431+j178@users.noreply.github.com>

fllesser marked this pull request as ready for review February 1, 2026 06:13

j178 requested a review from Copilot February 1, 2026 06:15

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j178 added the enhancement New feature or request label Feb 1, 2026

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Comment thread docs/languages.md

j178 merged commit 0a4be22 into j178:master Feb 1, 2026
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fllesser deleted the julia branch February 1, 2026 09:13

BrewTestBot mentioned this pull request Feb 6, 2026

prek 0.3.2 Homebrew/homebrew-core#266179

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langestefan mentioned this pull request Feb 10, 2026

Replace pre-commit with prek JuliaBesties/BestieTemplate.jl#592

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Support `Julia` language#1519

Support `Julia` language#1519
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