'stages: []' selects no stages

[adzenith]

Make stages: [] select no stages instead of all stages.

Implements #1785.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.66%. Comparing base (91a82cb) to head (afc05fa).
⚠️ Report is 28 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1787      +/-   ##
==========================================
- Coverage   91.66%   91.66%   -0.01%     
==========================================
  Files          98       98              
  Lines       19878    19886       +8     
==========================================
+ Hits        18222    18229       +7     
- Misses       1656     1657       +1     

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[prek-ci-bot]

📦 Cargo Bloat Comparison

Binary size change: +0.00% (24.7 MiB → 24.7 MiB)

Expand for cargo-bloat output

Head Branch Results

 File  .text     Size             Crate Name
 1.3%   2.7% 332.0KiB        aws_lc_sys aws_lc_0_38_0_aes_gcm_encrypt_avx512
 1.3%   2.7% 332.0KiB        aws_lc_sys aws_lc_0_38_0_aes_gcm_decrypt_avx512
 0.3%   0.6%  77.6KiB              prek prek::languages::<impl prek::config::Language>::run::{{closure}}::{{closure}}
 0.3%   0.6%  69.8KiB              prek prek::languages::<impl prek::config::Language>::run::{{closure}}::{{closure}}
 0.3%   0.6%  68.0KiB             prek? <prek::cli::Command as clap_builder::derive::Subcommand>::augment_subcommands
 0.2%   0.4%  51.0KiB annotate_snippets annotate_snippets::renderer::render::render
 0.2%   0.4%  50.6KiB              prek prek::languages::<impl prek::config::Language>::install::{{closure}}
 0.2%   0.4%  46.8KiB              prek prek::run::{{closure}}
 0.2%   0.3%  41.8KiB              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%  28.0KiB        aws_lc_sys aws_lc_0_38_0_edwards25519_scalarmuldouble_alt
 0.1%   0.2%  27.8KiB      serde_saphyr saphyr_parser_bw::scanner::Scanner<T>::fetch_more_tokens
 0.1%   0.2%  27.5KiB        aws_lc_sys aws_lc_0_38_0_edwards25519_scalarmuldouble
 0.1%   0.2%  25.8KiB              prek prek::cli::try_repo::try_repo::{{closure}}
 0.1%   0.2%  25.0KiB             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%  23.2KiB              prek prek::hooks::meta_hooks::MetaHooks::run::{{closure}}
 0.1%   0.2%  22.4KiB      serde_saphyr saphyr_parser_bw::scanner::Scanner<T>::fetch_more_tokens
 0.1%   0.2%  22.3KiB         [Unknown] Lp384_montjscalarmul_alt_p384_montjadd
 0.1%   0.2%  22.0KiB               std core::ptr::drop_in_place<prek::languages::<impl prek::config::Language>::install::{{closure}}>
 0.1%   0.2%  21.6KiB              prek prek::workspace::Project::init_hooks::{{closure}}
41.1%  85.9%  10.2MiB                   And 23268 smaller methods. Use -n N to show more.
47.8% 100.0%  11.8MiB                   .text section size, the file size is 24.7MiB

Base Branch Results

 File  .text     Size             Crate Name
 1.3%   2.7% 332.0KiB        aws_lc_sys aws_lc_0_38_0_aes_gcm_encrypt_avx512
 1.3%   2.7% 332.0KiB        aws_lc_sys aws_lc_0_38_0_aes_gcm_decrypt_avx512
 0.3%   0.6%  77.0KiB              prek prek::languages::<impl prek::config::Language>::run::{{closure}}::{{closure}}
 0.3%   0.6%  69.8KiB              prek prek::languages::<impl prek::config::Language>::run::{{closure}}::{{closure}}
 0.3%   0.6%  68.0KiB             prek? <prek::cli::Command as clap_builder::derive::Subcommand>::augment_subcommands
 0.2%   0.4%  51.0KiB annotate_snippets annotate_snippets::renderer::render::render
 0.2%   0.4%  50.6KiB              prek prek::languages::<impl prek::config::Language>::install::{{closure}}
 0.2%   0.4%  46.8KiB              prek prek::run::{{closure}}
 0.2%   0.3%  41.8KiB              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%  28.0KiB        aws_lc_sys aws_lc_0_38_0_edwards25519_scalarmuldouble_alt
 0.1%   0.2%  27.8KiB      serde_saphyr saphyr_parser_bw::scanner::Scanner<T>::fetch_more_tokens
 0.1%   0.2%  27.5KiB        aws_lc_sys aws_lc_0_38_0_edwards25519_scalarmuldouble
 0.1%   0.2%  25.8KiB              prek prek::cli::try_repo::try_repo::{{closure}}
 0.1%   0.2%  24.9KiB             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%  23.0KiB              prek prek::hooks::meta_hooks::MetaHooks::run::{{closure}}
 0.1%   0.2%  22.4KiB      serde_saphyr saphyr_parser_bw::scanner::Scanner<T>::fetch_more_tokens
 0.1%   0.2%  22.3KiB         [Unknown] Lp384_montjscalarmul_alt_p384_montjadd
 0.1%   0.2%  22.0KiB               std core::ptr::drop_in_place<prek::languages::<impl prek::config::Language>::install::{{closure}}>
 0.1%   0.2%  21.6KiB              prek prek::workspace::Project::init_hooks::{{closure}}
41.1%  86.0%  10.2MiB                   And 23261 smaller methods. Use -n N to show more.
47.8% 100.0%  11.8MiB                   .text section size, the file size is 24.7MiB

[prek-ci-bot]

⚡️ Hyperfine Benchmarks

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

Environment

• OS: Linux 6.14.0-1017-azure
• CPU: 4 cores
• prek version: prek 0.3.5+15 (aa17364 2026-03-13)
• Rust version: rustc 1.94.0 (4a4ef493e 2026-03-02)
• 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	2.4 ± 0.1	2.3	2.9	1.00
prek-head --version	2.5 ± 0.1	2.3	2.7	1.01 ± 0.06

prek list

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base list	9.3 ± 0.7	8.9	15.5	1.00
prek-head list	9.3 ± 0.2	8.9	10.3	1.00 ± 0.07

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 ± 1.0	3.1	10.3	1.06 ± 0.32
prek-head validate-config .pre-commit-config.yaml	3.2 ± 0.1	3.0	3.4	1.00

prek sample-config

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base sample-config	2.6 ± 0.0	2.5	2.7	1.00
prek-head sample-config	2.7 ± 0.0	2.6	2.8	1.01 ± 0.02

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	153.5 ± 2.7	149.8	158.9	1.00
prek-head run --all-files	154.7 ± 2.8	150.7	160.5	1.01 ± 0.03

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

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --all-files	153.8 ± 2.5	149.9	158.5	1.00
prek-head run --all-files	155.0 ± 3.3	150.1	162.9	1.01 ± 0.03

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	153.7 ± 2.0	150.8	158.1	1.00
prek-head run --all-files	157.3 ± 24.4	150.1	325.9	1.02 ± 0.16

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	23.3 ± 0.4	22.4	23.9	1.02 ± 0.03
prek-head run trailing-whitespace --all-files	22.9 ± 0.6	22.0	24.5	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	29.8 ± 2.1	27.2	35.1	1.00
prek-head run end-of-file-fixer --all-files	30.5 ± 2.3	26.5	35.5	1.02 ± 0.11

prek run check-json --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-json --all-files	13.5 ± 0.5	12.3	14.6	1.05 ± 0.05
prek-head run check-json --all-files	12.8 ± 0.4	12.3	13.7	1.00

prek run check-yaml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-yaml --all-files	12.5 ± 0.3	12.0	13.4	1.00 ± 0.03
prek-head run check-yaml --all-files	12.5 ± 0.3	12.0	13.1	1.00

prek run check-toml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-toml --all-files	12.8 ± 0.3	12.1	13.5	1.00 ± 0.04
prek-head run check-toml --all-files	12.8 ± 0.4	12.2	13.7	1.00

prek run check-xml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-xml --all-files	12.8 ± 0.4	12.1	13.7	1.00
prek-head run check-xml --all-files	12.9 ± 0.4	12.2	13.7	1.01 ± 0.05

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	5.1 ± 0.1	4.9	5.3	1.00 ± 0.04
prek-head install-hooks	5.1 ± 0.2	4.9	5.3	1.00

prek install-hooks (warm - with cache)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base install-hooks	5.0 ± 0.2	4.8	5.2	1.00
prek-head install-hooks	5.1 ± 0.1	5.0	5.3	1.02 ± 0.05

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	19.5 ± 0.3	19.1	20.2	1.01 ± 0.02
prek-head run	19.2 ± 0.2	18.9	19.8	1.00

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

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --files '*.json'	7.9 ± 0.3	7.6	9.0	1.03 ± 0.04
prek-head run --files '*.json'	7.6 ± 0.1	7.4	7.9	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	12.9 ± 0.3	12.6	14.1	1.00
prek-head run --dry-run --all-files	12.9 ± 0.3	12.4	13.8	1.00 ± 0.04

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	14.6 ± 0.2	14.3	15.1	1.00
prek-head run check-hooks-apply --all-files	14.7 ± 0.2	14.4	15.3	1.01 ± 0.02

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

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-useless-excludes --all-files	13.7 ± 0.9	12.6	14.7	1.06 ± 0.07
prek-head run check-useless-excludes --all-files	12.9 ± 0.3	12.7	13.6	1.00

prek run identity --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run identity --all-files	11.3 ± 0.1	11.1	11.5	1.00
prek-head run identity --all-files	11.6 ± 0.1	11.4	11.9	1.03 ± 0.02