Show hook aliases in run output

[j178]

Summary

• show configured hook aliases after hook IDs in verbose and failure details

Closes #2496

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 93.61%. Comparing base (4f32a05) to head (00e6a07).

Files with missing lines	Patch %	Lines
crates/prek/src/cli/run/run.rs	83.33%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2497   +/-   ##
=======================================
  Coverage   93.61%   93.61%           
=======================================
  Files         131      131           
  Lines       28359    28365    +6     
=======================================
+ Hits        26548    26554    +6     
  Misses       1811     1811           

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[Copilot]

Pull request overview

This PR improves prek run result readability by printing a hook’s configured alias alongside its id in verbose/failure details, which helps disambiguate repeated hook IDs that are configured multiple times with different aliases.

Changes:

• Print - hook alias: … after - hook id: … in detailed run output when an alias is present.
• Add a regression test covering repeated hook IDs with distinct aliases.
• Refactor progress-bar label handling in the run reporter (String vs Cow<str>).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
crates/prek/src/cli/run/run.rs	Adds alias output line in verbose/failure details.
crates/prek/tests/run.rs	Adds test asserting aliases are displayed for repeated hook IDs.
crates/prek/src/cli/run/reporter.rs	Adjusts progress bar label construction using Cow<str>.

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[prek-ci-bot]

📦 Cargo Bloat Comparison

Binary size change: +0.00% (29.6 MiB → 29.6 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_43_0_aes_gcm_encrypt_avx512
 1.1%   2.3% 332.0KiB        aws_lc_sys aws_lc_0_43_0_aes_gcm_decrypt_avx512
 0.2%   0.5%  71.1KiB              prek <prek::cli::Command as clap_builder::derive::Subcommand>::augment_subcommands
 0.2%   0.4%  58.0KiB              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%   0.4%  57.5KiB              prek prek::run::{closure#0}
 0.2%   0.3%  49.4KiB annotate_snippets annotate_snippets::renderer::render::render
 0.1%   0.3%  38.6KiB              prek prek::cli::run::run::run::{closure#0}
 0.1%   0.2%  33.9KiB              prek <prek::cli::RunOptions as clap_builder::derive::Args>::augment_args
 0.1%   0.2%  32.9KiB              prek <prek::languages::ruby::installer::RubyInstaller>::install::{closure#0}
 0.1%   0.2%  32.6KiB              prek <prek::languages::bun::installer::BunInstaller>::install::{closure#0}
 0.1%   0.2%  30.1KiB     granit_parser <granit_parser::scanner::Scanner<granit_parser::input::str::StrInput>>::fetch_more_tokens
 0.1%   0.2%  29.3KiB              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%  28.9KiB    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%  28.0KiB        aws_lc_sys aws_lc_0_43_0_edwards25519_scalarmuldouble_alt
 0.1%   0.2%  27.5KiB        aws_lc_sys aws_lc_0_43_0_edwards25519_scalarmuldouble
 0.1%   0.2%  27.0KiB              prek <prek::languages::deno::installer::DenoInstaller>::download::{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%  25.4KiB              prek prek::cli::try_repo::try_repo::{closure#0}
 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%  25.0KiB              prek <prek::languages::node::installer::NodeInstaller>::install::{closure#0}
42.2%  88.1%  12.5MiB                   And 26331 smaller methods. Use -n N to show more.
47.9% 100.0%  14.2MiB                   .text section size, the file size is 29.6MiB

Base Branch Results

 File  .text     Size             Crate Name
 1.1%   2.3% 332.0KiB        aws_lc_sys aws_lc_0_43_0_aes_gcm_encrypt_avx512
 1.1%   2.3% 332.0KiB        aws_lc_sys aws_lc_0_43_0_aes_gcm_decrypt_avx512
 0.2%   0.5%  71.1KiB              prek <prek::cli::Command as clap_builder::derive::Subcommand>::augment_subcommands
 0.2%   0.4%  57.5KiB              prek prek::run::{closure#0}
 0.2%   0.4%  56.1KiB              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
 0.2%   0.3%  45.8KiB              prek <prek::languages::ruby::installer::RubyInstaller>::install::{closure#0}
 0.1%   0.3%  38.7KiB              prek <prek::languages::node::installer::NodeInstaller>::install::{closure#0}
 0.1%   0.3%  38.6KiB              prek prek::cli::run::run::run::{closure#0}
 0.1%   0.2%  34.4KiB              prek <prek::cli::RunOptions as clap_builder::derive::Args>::augment_args
 0.1%   0.2%  32.9KiB              prek <prek::languages::golang::installer::GoInstaller>::install::{closure#0}
 0.1%   0.2%  31.4KiB              prek <prek::languages::bun::installer::BunInstaller>::install::{closure#0}
 0.1%   0.2%  30.1KiB     granit_parser <granit_parser::scanner::Scanner<granit_parser::input::str::StrInput>>::fetch_more_tokens
 0.1%   0.2%  28.9KiB    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%  28.4KiB              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_43_0_edwards25519_scalarmuldouble_alt
 0.1%   0.2%  27.5KiB        aws_lc_sys aws_lc_0_43_0_edwards25519_scalarmuldouble
 0.1%   0.2%  26.7KiB              prek <prek::languages::deno::installer::DenoInstaller>::download::{closure#0}
 0.1%   0.2%  25.2KiB              prek prek::cli::try_repo::try_repo::{closure#0}
 0.1%   0.2%  25.2KiB              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>
42.1%  87.9%  12.5MiB                   And 26378 smaller methods. Use -n N to show more.
47.9% 100.0%  14.2MiB                   .text section size, the file size is 29.6MiB

[prek-ci-bot]

⚡️ Hyperfine Benchmarks

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

Environment

• OS: Linux 6.17.0-1020-azure
• CPU: 4 cores
• prek version: prek 0.4.12+13 (3f65489 2026-08-07)
• 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	2.3 ± 0.2	2.1	3.2	1.03 ± 0.09
prek-head --version	2.3 ± 0.1	2.1	3.1	1.00

prek list

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base list	9.7 ± 0.3	9.2	10.4	1.00
prek-head list	9.8 ± 1.1	9.2	20.1	1.01 ± 0.11

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 ± 1.3	3.1	12.3	1.06 ± 0.40
prek-head validate-config .pre-commit-config.yaml	3.2 ± 0.0	3.1	3.3	1.00

prek sample-config

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base sample-config	2.5 ± 0.1	2.4	2.7	1.02 ± 0.06
prek-head sample-config	2.5 ± 0.1	2.4	3.3	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	40.2 ± 2.2	36.6	43.5	1.02 ± 0.06
prek-head run --all-files	39.3 ± 0.7	38.2	40.4	1.00

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

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --all-files	39.4 ± 1.4	36.3	41.9	1.00
prek-head run --all-files	41.1 ± 1.3	38.4	43.4	1.04 ± 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	40.1 ± 1.3	37.9	43.8	1.02 ± 0.05
prek-head run --all-files	39.5 ± 1.3	36.4	42.2	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	13.1 ± 0.5	12.3	14.3	1.01 ± 0.05
prek-head run trailing-whitespace --all-files	13.0 ± 0.3	12.3	13.8	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	11.1 ± 0.5	10.3	12.3	1.00
prek-head run end-of-file-fixer --all-files	11.3 ± 0.7	10.5	13.6	1.02 ± 0.08

prek run check-json --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-json --all-files	8.3 ± 1.3	7.4	15.0	1.02 ± 0.17
prek-head run check-json --all-files	8.1 ± 0.4	7.5	9.2	1.00

prek run check-yaml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-yaml --all-files	7.8 ± 0.2	7.5	8.2	1.00
prek-head run check-yaml --all-files	7.9 ± 0.2	7.5	8.6	1.00 ± 0.04

prek run check-toml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-toml --all-files	7.9 ± 0.2	7.5	8.4	1.00
prek-head run check-toml --all-files	8.2 ± 0.3	7.7	8.8	1.04 ± 0.05

prek run check-xml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-xml --all-files	8.2 ± 0.5	7.5	9.6	1.00
prek-head run check-xml --all-files	8.3 ± 0.4	7.9	9.6	1.01 ± 0.08

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

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run detect-private-key --all-files	11.9 ± 0.5	10.8	12.7	1.02 ± 0.06
prek-head run detect-private-key --all-files	11.7 ± 0.6	10.7	13.0	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	13.6 ± 0.8	12.1	15.5	1.00
prek-head run fix-byte-order-marker --all-files	14.0 ± 0.8	12.9	15.7	1.02 ± 0.09

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	4.9 ± 0.3	4.7	5.5	1.00 ± 0.07
prek-head install-hooks	4.9 ± 0.2	4.7	5.2	1.00

prek install-hooks (warm - with cache)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base install-hooks	5.0 ± 0.3	4.8	5.4	1.06 ± 0.06
prek-head install-hooks	4.7 ± 0.1	4.7	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	25.3 ± 1.0	24.3	27.1	1.04 ± 0.05
prek-head run	24.4 ± 0.6	23.8	25.7	1.00

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

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --files '*.json'	5.2 ± 0.1	5.1	5.5	1.00 ± 0.03
prek-head run --files '*.json'	5.2 ± 0.1	5.0	5.4	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	6.9 ± 0.1	6.8	7.2	1.00
prek-head run --dry-run --all-files	6.9 ± 0.1	6.8	7.3	1.00 ± 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	8.5 ± 0.3	8.1	9.0	1.00
prek-head run check-hooks-apply --all-files	8.6 ± 0.4	8.2	9.4	1.02 ± 0.05

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

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-useless-excludes --all-files	8.4 ± 0.1	8.2	8.7	1.01 ± 0.02
prek-head run check-useless-excludes --all-files	8.4 ± 0.1	8.2	8.7	1.00

prek run identity --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run identity --all-files	7.4 ± 0.4	7.0	8.1	1.01 ± 0.06
prek-head run identity --all-files	7.3 ± 0.1	7.2	7.4	1.00