Reduce hook dispatch await points

[j178]

Box hook implementation futures so BuiltinHooks::run and PreCommitHooks::run each have a single suspension point, reducing their generated state-machine size.

[Copilot]

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[codecov]

Codecov Report

❌ Patch coverage is 70.37037% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.35%. Comparing base (295888e) to head (b158999).

Files with missing lines	Patch %	Lines
crates/prek/src/hooks/pre_commit_hooks/mod.rs	27.27%	16 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2360   +/-   ##
=======================================
  Coverage   93.35%   93.35%           
=======================================
  Files         129      129           
  Lines       27402    27408    +6     
=======================================
+ Hits        25582    25588    +6     
  Misses       1820     1820           

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[prek-ci-bot]

📦 Cargo Bloat Comparison

Binary size change: +0.00% (29.1 MiB → 29.1 MiB)

Expand for cargo-bloat output

Head Branch Results

 File  .text     Size             Crate Name
 1.1%   2.3% 332.0KiB        aws_lc_sys aws_lc_0_42_0_aes_gcm_encrypt_avx512
 1.1%   2.3% 332.0KiB        aws_lc_sys aws_lc_0_42_0_aes_gcm_decrypt_avx512
 0.3%   0.6%  79.3KiB              prek <prek::cli::Command as clap_builder::derive::Subcommand>::augment_subcommands
 0.2%   0.4%  52.4KiB              prek <<prek::config::Config as serde_core::de::Deserialize>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map::<<serde_saphyr::de::deserializer::YamlDeserializer as serde_core::de::Deserializer>::deserialize_map::MA>
 0.2%   0.3%  49.4KiB annotate_snippets annotate_snippets::renderer::render::render
 0.1%   0.3%  41.3KiB              prek prek::cli::run::run::run::{closure#0}
 0.1%   0.3%  39.5KiB              prek prek::run::{closure#0}
 0.1%   0.2%  33.2KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
 0.1%   0.2%  32.1KiB              prek <prek::cli::RunOptions as clap_builder::derive::Args>::augment_args
 0.1%   0.2%  30.1KiB     granit_parser <granit_parser::scanner::Scanner<granit_parser::input::str::StrInput>>::fetch_more_tokens
 0.1%   0.2%  28.6KiB    cargo_metadata <&mut serde_json::de::Deserializer<serde_json::read::StrRead> as serde_core::de::Deserializer>::deserialize_struct::<<cargo_metadata::Package as serde_core::de::Deserialize>::deserialize::__Visitor>
 0.1%   0.2%  28.3KiB              prek <<prek::config::RemoteHook as serde_core::de::Deserialize>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map::<<serde_saphyr::de::deserializer::YamlDeserializer as serde_core::de::Deserializer>::deserialize_map::MA>
 0.1%   0.2%  28.0KiB        aws_lc_sys aws_lc_0_42_0_edwards25519_scalarmuldouble_alt
 0.1%   0.2%  27.5KiB        aws_lc_sys aws_lc_0_42_0_edwards25519_scalarmuldouble
 0.1%   0.2%  26.2KiB              prek prek::cli::try_repo::try_repo::{closure#0}
 0.1%   0.2%  25.6KiB              prek <<prek::config::LocalHook as serde_core::de::Deserialize>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map::<<serde_saphyr::de::deserializer::YamlDeserializer as serde_core::de::Deserializer>::deserialize_map::MA>
 0.1%   0.2%  25.2KiB              prek <<prek::config::UpdateOptions as serde_core::de::Deserialize>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map::<<serde_saphyr::de::deserializer::YamlDeserializer as serde_core::de::Deserializer>::deserialize_map::MA>
 0.1%   0.2%  24.9KiB               xml <xml::reader::parser::PullParser>::dispatch_token
 0.1%   0.2%  24.4KiB              prek <prek::languages::node::installer::NodeInstaller>::install::{closure#0}
 0.1%   0.2%  24.0KiB     granit_parser <granit_parser::scanner::Scanner<serde_saphyr::de::buffered_input::ReaderInput>>::fetch_more_tokens
42.0%  88.1%  12.2MiB                   And 25792 smaller methods. Use -n N to show more.
47.7% 100.0%  13.9MiB                   .text section size, the file size is 29.1MiB

Base Branch Results

 File  .text     Size             Crate Name
 1.1%   2.3% 332.0KiB        aws_lc_sys aws_lc_0_42_0_aes_gcm_encrypt_avx512
 1.1%   2.3% 332.0KiB        aws_lc_sys aws_lc_0_42_0_aes_gcm_decrypt_avx512
 0.3%   0.6%  79.3KiB              prek <prek::cli::Command as clap_builder::derive::Subcommand>::augment_subcommands
 0.2%   0.4%  52.4KiB              prek <<prek::config::Config as serde_core::de::Deserialize>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map::<<serde_saphyr::de::deserializer::YamlDeserializer as serde_core::de::Deserializer>::deserialize_map::MA>
 0.2%   0.3%  49.4KiB annotate_snippets annotate_snippets::renderer::render::render
 0.1%   0.3%  41.3KiB              prek prek::cli::run::run::run::{closure#0}
 0.1%   0.3%  39.5KiB              prek prek::run::{closure#0}
 0.1%   0.2%  33.4KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
 0.1%   0.2%  32.1KiB              prek <prek::cli::RunOptions as clap_builder::derive::Args>::augment_args
 0.1%   0.2%  30.1KiB     granit_parser <granit_parser::scanner::Scanner<granit_parser::input::str::StrInput>>::fetch_more_tokens
 0.1%   0.2%  28.6KiB    cargo_metadata <&mut serde_json::de::Deserializer<serde_json::read::StrRead> as serde_core::de::Deserializer>::deserialize_struct::<<cargo_metadata::Package as serde_core::de::Deserialize>::deserialize::__Visitor>
 0.1%   0.2%  28.3KiB              prek <<prek::config::RemoteHook as serde_core::de::Deserialize>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map::<<serde_saphyr::de::deserializer::YamlDeserializer as serde_core::de::Deserializer>::deserialize_map::MA>
 0.1%   0.2%  28.0KiB        aws_lc_sys aws_lc_0_42_0_edwards25519_scalarmuldouble_alt
 0.1%   0.2%  27.5KiB        aws_lc_sys aws_lc_0_42_0_edwards25519_scalarmuldouble
 0.1%   0.2%  26.2KiB              prek prek::cli::try_repo::try_repo::{closure#0}
 0.1%   0.2%  25.6KiB              prek <<prek::config::LocalHook as serde_core::de::Deserialize>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map::<<serde_saphyr::de::deserializer::YamlDeserializer as serde_core::de::Deserializer>::deserialize_map::MA>
 0.1%   0.2%  25.2KiB              prek <<prek::config::UpdateOptions as serde_core::de::Deserialize>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map::<<serde_saphyr::de::deserializer::YamlDeserializer as serde_core::de::Deserializer>::deserialize_map::MA>
 0.1%   0.2%  24.9KiB               xml <xml::reader::parser::PullParser>::dispatch_token
 0.1%   0.2%  24.3KiB              prek <prek::languages::node::installer::NodeInstaller>::install::{closure#0}
 0.1%   0.2%  24.0KiB     granit_parser <granit_parser::scanner::Scanner<serde_saphyr::de::buffered_input::ReaderInput>>::fetch_more_tokens
42.0%  88.1%  12.2MiB                   And 25816 smaller methods. Use -n N to show more.
47.7% 100.0%  13.9MiB                   .text section size, the file size is 29.1MiB

[prek-ci-bot]

⚡️ Hyperfine Benchmarks

Summary: 1 regressions, 0 improvements above the 10% threshold.

Environment

• OS: Linux 6.17.0-1020-azure
• CPU: 4 cores
• prek version: prek 0.4.10+3 (267aa84 2026-07-18)
• Rust version: rustc 1.97.1 (8bab26f4f 2026-07-14)
• 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	2.2 ± 0.1	2.1	2.4	1.00 ± 0.06
prek-head --version	2.2 ± 0.1	2.0	2.6	1.00

prek list

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base list	9.2 ± 0.1	9.0	9.4	1.00
prek-head list	9.3 ± 0.1	9.1	10.2	1.00 ± 0.02

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

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base validate-config .pre-commit-config.yaml	3.1 ± 0.1	3.0	3.3	1.00
prek-head validate-config .pre-commit-config.yaml	3.1 ± 0.0	3.0	3.2	1.01 ± 0.02

prek sample-config

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base sample-config	2.4 ± 0.0	2.3	2.5	1.00
prek-head sample-config	2.4 ± 0.0	2.3	2.5	1.02 ± 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	75.4 ± 1.8	72.9	77.8	1.00
prek-head run --all-files	75.7 ± 2.1	73.3	79.6	1.00 ± 0.04

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

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --all-files	75.2 ± 2.6	71.0	80.1	1.00
prek-head run --all-files	76.4 ± 2.4	72.6	81.1	1.02 ± 0.05

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	75.6 ± 2.4	71.2	80.2	1.00
prek-head run --all-files	76.2 ± 2.8	71.5	86.4	1.01 ± 0.05

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	20.0 ± 0.3	19.5	21.1	1.01 ± 0.02
prek-head run trailing-whitespace --all-files	19.7 ± 0.3	19.4	20.7	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	26.6 ± 2.1	23.6	30.3	1.04 ± 0.11
prek-head run end-of-file-fixer --all-files	25.4 ± 1.8	23.6	30.3	1.00

prek run check-json --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-json --all-files	7.6 ± 0.3	7.2	8.2	1.00 ± 0.05
prek-head run check-json --all-files	7.6 ± 0.3	7.0	8.4	1.00

prek run check-yaml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-yaml --all-files	7.4 ± 0.1	7.3	7.7	1.00 ± 0.02
prek-head run check-yaml --all-files	7.4 ± 0.1	7.1	7.9	1.00

prek run check-toml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-toml --all-files	7.6 ± 0.3	7.2	8.4	1.00 ± 0.06
prek-head run check-toml --all-files	7.6 ± 0.3	7.1	8.1	1.00

prek run check-xml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-xml --all-files	7.3 ± 0.2	7.0	7.9	1.00
prek-head run check-xml --all-files	7.3 ± 0.4	6.8	8.4	1.01 ± 0.06

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

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run detect-private-key --all-files	13.1 ± 1.1	11.7	15.6	1.00
prek-head run detect-private-key --all-files	13.9 ± 1.3	12.2	16.8	1.07 ± 0.13

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	17.9 ± 0.9	16.7	20.2	1.00
prek-head run fix-byte-order-marker --all-files	18.2 ± 0.8	17.0	20.0	1.02 ± 0.07

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	4.4 ± 0.1	4.3	4.5	1.00
prek-head install-hooks	4.4 ± 0.0	4.4	4.4	1.00 ± 0.01

prek install-hooks (warm - with cache)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base install-hooks	4.4 ± 0.0	4.3	4.4	1.00
prek-head install-hooks	4.4 ± 0.1	4.3	4.6	1.01 ± 0.02

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	37.0 ± 1.0	35.7	39.2	1.00
prek-head run	46.5 ± 27.9	35.4	135.3	1.26 ± 0.75

⚠️ Warning: Performance regression for prek run (staged files only): 25.7200% slower

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

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --files '*.json'	7.9 ± 0.1	7.7	8.1	1.00
prek-head run --files '*.json'	7.9 ± 0.1	7.7	8.1	1.00 ± 0.02

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	6.8 ± 0.1	6.7	6.9	1.00
prek-head run --dry-run --all-files	6.9 ± 0.1	6.8	7.0	1.01 ± 0.02

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	11.2 ± 0.8	10.3	12.1	1.03 ± 0.11
prek-head run check-hooks-apply --all-files	10.8 ± 0.8	10.3	12.9	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	10.6 ± 0.5	10.3	12.4	1.01 ± 0.05
prek-head run check-useless-excludes --all-files	10.5 ± 0.1	10.4	10.6	1.00

prek run identity --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run identity --all-files	9.7 ± 0.1	9.6	9.9	1.00
prek-head run identity --all-files	9.8 ± 0.1	9.6	10.2	1.01 ± 0.02