Add conda language support by j178 · Pull Request #2203 · j178/prek

j178 · 2026-06-11T07:33:18Z

Closes #52, pixi support not included, we might add specific language: pixi support later.

codecov · 2026-06-11T07:35:08Z

Codecov Report

❌ Patch coverage is 87.16216% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.56%. Comparing base (bb1131b) to head (5ca4c19).

Files with missing lines	Patch %	Lines
crates/prek/src/languages/conda.rs	93.44%	8 Missing ⚠️
crates/prek/src/languages/coursier.rs	65.00%	7 Missing ⚠️
crates/prek/src/languages/mod.rs	33.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2203      +/-   ##
==========================================
- Coverage   92.57%   92.56%   -0.01%     
==========================================
  Files         124      125       +1     
  Lines       26461    26587     +126     
==========================================
+ Hits        24495    24609     +114     
- Misses       1966     1978      +12

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Copilot

Pull request overview

This PR adds first-class Conda language support to prek, wiring it into the language dispatcher, documenting expected behavior, adding integration tests, and updating CI to provision Micromamba for the new language test group.

Changes:

Add a new conda language backend (install + run) and mark Conda as supported/shell-capable.
Add end-to-end language tests for conda (local + remote repo + language_version rejection).
Update docs and CI matrix/workflow to include Conda and install Micromamba when needed.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
scripts/generate-ci-matrix.py	Adds `conda` test grouping and adjusts language weights used for CI matrix balancing.
docs/reference/configuration.md	Updates the “shell unsupported languages” table to reflect Conda support.
docs/proposals/hook-shell.md	Updates proposal doc to reflect Conda no longer being unimplemented.
docs/languages.md	Documents Conda behavior, env selection (`conda`/`mamba`/`micromamba`), and `language_version` rejection.
crates/prek/tests/languages/main.rs	Registers the new `conda` language test module.
crates/prek/tests/languages/conda.rs	Adds integration tests covering Conda local/remote installs and `language_version` rejection.
crates/prek/src/languages/mod.rs	Wires `conda` into the language enum dispatch and shell support/supported checks.
crates/prek/src/languages/conda.rs	Implements Conda environment creation, dependency installation, and hook execution via PATH adjustment.
crates/prek-consts/src/env_vars.rs	Adds Conda-related environment variable constants.
.github/workflows/ci.yml	Fixes matrix generation script path and installs Micromamba + sets `PRE_COMMIT_USE_MICROMAMBA` for language tests.

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prek-ci-bot · 2026-06-11T07:41:26Z

📦 Cargo Bloat Comparison

Binary size change: +0.38% (26.5 MiB → 26.6 MiB)

Expand for cargo-bloat output

Head Branch Results

 File  .text     Size             Crate Name
 1.2%   2.5% 332.0KiB        aws_lc_sys aws_lc_0_41_0_aes_gcm_encrypt_avx512
 1.2%   2.5% 332.0KiB        aws_lc_sys aws_lc_0_41_0_aes_gcm_decrypt_avx512
 0.4%   0.7%  95.4KiB              prek prek::languages::<impl prek::config::Language>::run::{{closure}}::{{closure}}
 0.3%   0.7%  90.7KiB              prek prek::languages::<impl prek::config::Language>::run::{{closure}}::{{closure}}
 0.3%   0.6%  85.1KiB              prek prek::languages::<impl prek::config::Language>::install::{{closure}}
 0.3%   0.6%  79.4KiB             prek? <prek::cli::Command as clap_builder::derive::Subcommand>::augment_subcommands
 0.2%   0.4%  49.7KiB              prek prek::run::{{closure}}
 0.2%   0.4%  49.4KiB annotate_snippets annotate_snippets::renderer::render::render
 0.2%   0.3%  44.6KiB              prek prek::cli::run::run::run::{{closure}}
 0.2%   0.3%  43.9KiB             prek? <prek::config::_::<impl serde_core::de::Deserialize for prek::config::Config>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map
 0.1%   0.2%  32.0KiB               std core::ptr::drop_in_place<prek::languages::<impl prek::config::Language>::install::{{closure}}>
 0.1%   0.2%  31.8KiB             prek? <prek::cli::RunOptions as clap_builder::derive::Args>::augment_args
 0.1%   0.2%  29.4KiB     granit_parser granit_parser::scanner::Scanner<T>::fetch_more_tokens
 0.1%   0.2%  28.3KiB             prek? <prek::config::_::<impl serde_core::de::Deserialize for prek::config::RemoteHook>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map
 0.1%   0.2%  28.0KiB        aws_lc_sys aws_lc_0_41_0_edwards25519_scalarmuldouble_alt
 0.1%   0.2%  27.5KiB        aws_lc_sys aws_lc_0_41_0_edwards25519_scalarmuldouble
 0.1%   0.2%  26.2KiB              prek prek::cli::try_repo::try_repo::{{closure}}
 0.1%   0.2%  24.8KiB             prek? <prek::config::_::<impl serde_core::de::Deserialize for prek::config::LocalHook>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map
 0.1%   0.2%  22.9KiB     granit_parser granit_parser::scanner::Scanner<T>::fetch_more_tokens
 0.1%   0.2%  22.3KiB         [Unknown] Lp384_montjscalarmul_alt_p384_montjadd
41.8%  86.0%  11.1MiB                   And 24265 smaller methods. Use -n N to show more.
48.6% 100.0%  12.9MiB                   .text section size, the file size is 26.6MiB

Base Branch Results

 File  .text     Size             Crate Name
 1.2%   2.5% 332.0KiB        aws_lc_sys aws_lc_0_41_0_aes_gcm_encrypt_avx512
 1.2%   2.5% 332.0KiB        aws_lc_sys aws_lc_0_41_0_aes_gcm_decrypt_avx512
 0.3%   0.7%  92.2KiB              prek prek::languages::<impl prek::config::Language>::run::{{closure}}::{{closure}}
 0.3%   0.7%  87.4KiB              prek prek::languages::<impl prek::config::Language>::run::{{closure}}::{{closure}}
 0.3%   0.6%  80.7KiB              prek prek::languages::<impl prek::config::Language>::install::{{closure}}
 0.2%   0.5%  64.9KiB             prek? <prek::cli::Command as clap_builder::derive::Subcommand>::augment_subcommands
 0.2%   0.4%  49.5KiB              prek prek::run::{{closure}}
 0.2%   0.4%  49.4KiB annotate_snippets annotate_snippets::renderer::render::render
 0.2%   0.3%  44.6KiB             prek? <prek::config::_::<impl serde_core::de::Deserialize for prek::config::Config>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map
 0.2%   0.3%  44.6KiB              prek prek::cli::run::run::run::{{closure}}
 0.1%   0.2%  31.8KiB             prek? <prek::cli::RunOptions as clap_builder::derive::Args>::augment_args
 0.1%   0.2%  31.6KiB               std core::ptr::drop_in_place<prek::languages::<impl prek::config::Language>::install::{{closure}}>
 0.1%   0.2%  29.4KiB     granit_parser granit_parser::scanner::Scanner<T>::fetch_more_tokens
 0.1%   0.2%  28.3KiB             prek? <prek::config::_::<impl serde_core::de::Deserialize for prek::config::RemoteHook>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map
 0.1%   0.2%  28.0KiB        aws_lc_sys aws_lc_0_41_0_edwards25519_scalarmuldouble_alt
 0.1%   0.2%  27.5KiB        aws_lc_sys aws_lc_0_41_0_edwards25519_scalarmuldouble
 0.1%   0.2%  26.1KiB              prek prek::cli::try_repo::try_repo::{{closure}}
 0.1%   0.2%  24.8KiB             prek? <prek::config::_::<impl serde_core::de::Deserialize for prek::config::LocalHook>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map
 0.1%   0.2%  22.9KiB     granit_parser granit_parser::scanner::Scanner<T>::fetch_more_tokens
 0.1%   0.2%  22.3KiB         [Unknown] Lp384_montjscalarmul_alt_p384_montjadd
41.8%  86.2%  11.1MiB                   And 24243 smaller methods. Use -n N to show more.
48.5% 100.0%  12.9MiB                   .text section size, the file size is 26.5MiB

prek-ci-bot · 2026-06-11T07:41:27Z

⚡️ Hyperfine Benchmarks

Summary: 0 regressions, 0 improvements above the 10% threshold.

Environment

OS: Linux 6.17.0-1018-azure
CPU: 4 cores
prek version: prek 0.4.4+45 (b4e1935 2026-06-11)
Rust version: rustc 1.96.0 (ac68faa20 2026-05-25)
Hyperfine version: hyperfine 1.20.0

CLI Commands

Benchmarking basic commands in the main repo:

`prek --version`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base --version`	2.5 ± 0.1	2.3	3.3	1.06 ± 0.07
`prek-head --version`	2.3 ± 0.1	2.2	3.0	1.00

`prek list`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base list`	9.5 ± 0.1	9.2	10.0	1.01 ± 0.02
`prek-head list`	9.4 ± 0.2	9.0	10.3	1.00

`prek validate-config .pre-commit-config.yaml`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base validate-config .pre-commit-config.yaml`	3.4 ± 0.1	3.3	3.8	1.07 ± 0.03
`prek-head validate-config .pre-commit-config.yaml`	3.2 ± 0.1	3.1	3.3	1.00

`prek sample-config`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base sample-config`	2.8 ± 0.0	2.7	2.9	1.07 ± 0.03
`prek-head sample-config`	2.6 ± 0.1	2.5	2.8	1.00

Cold vs Warm Runs

Comparing first run (cold) vs subsequent runs (warm cache):

`prek run --all-files (cold - no cache)`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base run --all-files`	75.9 ± 1.7	73.7	78.8	1.00 ± 0.04
`prek-head run --all-files`	75.6 ± 2.8	71.6	79.6	1.00

`prek run --all-files (warm - with cache)`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base run --all-files`	77.8 ± 5.9	71.5	97.0	1.03 ± 0.09
`prek-head run --all-files`	75.5 ± 3.4	70.3	80.2	1.00

Full Hook Suite

Running the builtin hook suite on the benchmark workspace:

`prek run --all-files (full builtin hook suite)`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base run --all-files`	75.9 ± 4.4	70.0	91.3	1.01 ± 0.07
`prek-head run --all-files`	75.1 ± 3.4	69.7	81.3	1.00

Individual Hook Performance

Benchmarking each hook individually on the test repo:

`prek run trailing-whitespace --all-files`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base run trailing-whitespace --all-files`	20.6 ± 0.5	19.7	21.6	1.01 ± 0.03
`prek-head run trailing-whitespace --all-files`	20.4 ± 0.4	19.6	21.1	1.00

`prek run end-of-file-fixer --all-files`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base run end-of-file-fixer --all-files`	26.9 ± 2.3	23.5	31.3	1.01 ± 0.11
`prek-head run end-of-file-fixer --all-files`	26.5 ± 1.9	24.0	31.1	1.00

`prek run check-json --all-files`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base run check-json --all-files`	8.2 ± 0.2	7.8	8.7	1.00 ± 0.04
`prek-head run check-json --all-files`	8.2 ± 0.3	7.8	8.9	1.00

`prek run check-yaml --all-files`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base run check-yaml --all-files`	8.1 ± 0.1	7.8	8.3	1.03 ± 0.02
`prek-head run check-yaml --all-files`	7.9 ± 0.1	7.6	8.3	1.00

`prek run check-toml --all-files`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base run check-toml --all-files`	8.1 ± 0.2	7.8	8.5	1.02 ± 0.04
`prek-head run check-toml --all-files`	8.0 ± 0.2	7.6	8.5	1.00

`prek run check-xml --all-files`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base run check-xml --all-files`	8.3 ± 0.3	7.8	8.8	1.04 ± 0.04
`prek-head run check-xml --all-files`	8.0 ± 0.2	7.6	8.5	1.00

`prek run detect-private-key --all-files`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base run detect-private-key --all-files`	14.1 ± 1.4	12.4	19.5	1.04 ± 0.12
`prek-head run detect-private-key --all-files`	13.7 ± 0.8	12.5	15.8	1.00

`prek run fix-byte-order-marker --all-files`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base run fix-byte-order-marker --all-files`	18.9 ± 0.8	17.6	20.1	1.00
`prek-head run fix-byte-order-marker --all-files`	18.9 ± 0.7	17.8	20.4	1.00 ± 0.06

Installation Performance

Benchmarking hook installation (fast path hooks skip Python setup):

`prek install-hooks (cold - no cache)`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base install-hooks`	5.0 ± 0.1	4.9	5.1	1.04 ± 0.02
`prek-head install-hooks`	4.8 ± 0.1	4.7	4.9	1.00

`prek install-hooks (warm - with cache)`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base install-hooks`	4.9 ± 0.0	4.9	5.0	1.04 ± 0.02
`prek-head install-hooks`	4.7 ± 0.1	4.6	4.8	1.00

File Filtering/Scoping Performance

Testing different file selection modes:

`prek run (staged files only)`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base run`	39.4 ± 0.9	38.2	41.0	1.00
`prek-head run`	39.7 ± 0.9	38.3	41.8	1.01 ± 0.03

`prek run --files '*.json' (specific file type)`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base run --files '*.json'`	8.8 ± 0.3	8.6	9.7	1.04 ± 0.04
`prek-head run --files '*.json'`	8.5 ± 0.1	8.4	8.7	1.00

Workspace Discovery & Initialization

Benchmarking hook discovery and initialization overhead:

`prek run --dry-run --all-files (measures init overhead)`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base run --dry-run --all-files`	7.5 ± 0.1	7.4	7.7	1.03 ± 0.02
`prek-head run --dry-run --all-files`	7.3 ± 0.1	7.2	7.5	1.00

Meta Hooks Performance

Benchmarking meta hooks separately:

`prek run check-hooks-apply --all-files`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base run check-hooks-apply --all-files`	12.4 ± 1.3	11.4	14.7	1.10 ± 0.12
`prek-head run check-hooks-apply --all-files`	11.3 ± 0.1	11.1	11.5	1.00

`prek run check-useless-excludes --all-files`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base run check-useless-excludes --all-files`	11.5 ± 0.1	11.3	11.8	1.02 ± 0.01
`prek-head run check-useless-excludes --all-files`	11.3 ± 0.1	11.0	11.5	1.00

`prek run identity --all-files`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base run identity --all-files`	10.8 ± 0.1	10.6	11.0	1.03 ± 0.01
`prek-head run identity --all-files`	10.5 ± 0.1	10.4	10.6	1.00

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baszalmstra · 2026-06-11T09:22:13Z

Instead of using conda directly, I recommend you look at rattler its a rust native implementation (which is what pixi is using). That has the advantage that you don't need any external tools!

I can also guarantee that it will be much faster.

j178 · 2026-06-11T09:49:11Z

That may be next step, see #2204

This MR contains the following updates: | Package | Update | Change | |---|---|---| | [prek](https://github.com/j178/prek) | patch | `0.4.4` → `0.4.5` | 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> ### [`v0.4.5`](https://github.com/j178/prek/blob/HEAD/CHANGELOG.md#045) [Compare Source](j178/prek@v0.4.4...v0.4.5) Released on 2026-06-15. ##### ✨Highlights 0.4.5 completes `prek`'s pre-commit language coverage. With R, Conda, Perl, and coursier now supported, `prek` supports every language available in pre-commit, plus `prek`-only modern languages such as Bun and Deno. This is full feature parity with pre-commit. The last major compatibility gap is closed, and `prek` is now on the path to 1.0. ##### 💚 Sponsorship If `prek` saves time for you or your team, please consider sponsoring the project on [GitHub Sponsors](https://github.com/sponsors/j178). It helps keep new features, performance work, and maintenance moving. ##### Enhancements - Add `Perl` language support ([#2201](j178/prek#2201)) - Add `R` language support ([#2206](j178/prek#2206)) - Add `Conda` language support ([#2203](j178/prek#2203)) - Add `coursier` language support ([#2194](j178/prek#2194)) - Add group filters to list ([#2152](j178/prek#2152)) - Remove legacy repo path support ([#2150](j178/prek#2150)) - Skip cloning fully filtered remote repos ([#2151](j178/prek#2151)) ##### Performance - Avoid building JSON trees in syntax hooks ([#2156](j178/prek#2156)) - Scan mixed line endings without line vector ([#2160](j178/prek#2160)) - Skip file scan for always-run no-filename hooks ([#2155](j178/prek#2155)) - Use fixed buffer for EOF scan ([#2163](j178/prek#2163)) - Use fixed buffer for private key scan ([#2164](j178/prek#2164)) ##### Bug fixes - Fix pretty-format-json CRLF handling ([#2210](j178/prek#2210)) - Handle missing blobs in diff snapshots ([#2211](j178/prek#2211)) - Ignore coursier channel from working repo ([#2202](j178/prek#2202)) ##### Contributors - [@j178](https://github.com/j178) </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).

Add conda language support

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Copilot AI review requested due to automatic review settings June 11, 2026 07:33

j178 added the enhancement New feature or request label Jun 11, 2026

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j178 merged commit 6166275 into master Jun 11, 2026
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j178 deleted the conda branch June 11, 2026 09:13

j178 mentioned this pull request Jun 11, 2026

Support pixi for Conda language #2204

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BrewTestBot mentioned this pull request Jun 15, 2026

prek 0.4.5 Homebrew/homebrew-core#288054

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📦 Cargo Bloat Comparison

Head Branch Results

Base Branch Results

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⚡️ Hyperfine Benchmarks

prek --version

prek list

prek validate-config .pre-commit-config.yaml

prek sample-config

prek run --all-files (cold - no cache)

prek run --all-files (warm - with cache)

prek run --all-files (full builtin hook suite)

prek run trailing-whitespace --all-files

prek run end-of-file-fixer --all-files

prek run check-json --all-files

prek run check-yaml --all-files

prek run check-toml --all-files

prek run check-xml --all-files

prek run detect-private-key --all-files

prek run fix-byte-order-marker --all-files

prek install-hooks (cold - no cache)

prek install-hooks (warm - with cache)

prek run (staged files only)

prek run --files '*.json' (specific file type)

prek run --dry-run --all-files (measures init overhead)

prek run check-hooks-apply --all-files

prek run check-useless-excludes --all-files

prek run identity --all-files

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prek-ci-bot Bot commented Jun 11, 2026 •

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`prek --version`

`prek list`

`prek validate-config .pre-commit-config.yaml`

`prek sample-config`

`prek run --all-files (cold - no cache)`

`prek run --all-files (warm - with cache)`

`prek run --all-files (full builtin hook suite)`

`prek run trailing-whitespace --all-files`

`prek run end-of-file-fixer --all-files`

`prek run check-json --all-files`

`prek run check-yaml --all-files`

`prek run check-toml --all-files`

`prek run check-xml --all-files`

`prek run detect-private-key --all-files`

`prek run fix-byte-order-marker --all-files`

`prek install-hooks (cold - no cache)`

`prek install-hooks (warm - with cache)`

`prek run (staged files only)`

`prek run --files '*.json' (specific file type)`

`prek run --dry-run --all-files (measures init overhead)`

`prek run check-hooks-apply --all-files`

`prek run check-useless-excludes --all-files`

`prek run identity --all-files`

j178 commented Jun 11, 2026 •

edited

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