Implement priority based parallel execution

[j178]

Closes #1242

[github-actions]

📦 Cargo Bloat Comparison

Binary size change: +0.00% (16.7 MiB → 16.7 MiB)

Expand for cargo-bloat output

Head Branch Results

 File  .text     Size          Crate Name
 0.6%   1.4% 107.3KiB          prek? <prek::cli::Command as clap_builder::derive::Subcommand>::augment_subcommands
 0.6%   1.4% 107.2KiB           prek prek::languages::<impl prek::config::Language>::run::{{closure}}::{{closure}}
 0.3%   0.7%  54.7KiB           prek prek::archive::unpack::{{closure}}
 0.3%   0.7%  52.8KiB             h2 h2::proto::connection::Connection<T,P,B>::poll
 0.2%   0.5%  39.2KiB          prek? <prek::cli::RunArgs as clap_builder::derive::Args>::augment_args
 0.2%   0.5%  38.4KiB           prek prek::run::{{closure}}
 0.2%   0.5%  38.3KiB           prek prek::languages::<impl prek::config::Language>::install::{{closure}}
 0.2%   0.5%  37.3KiB          hyper hyper::proto::h1::dispatch::Dispatcher<D,Bs,I,T>::poll_loop
 0.2%   0.5%  36.9KiB regex_automata regex_automata::meta::strategy::new
 0.2%   0.5%  36.5KiB           prek prek::workspace::Workspace::discover
 0.2%   0.4%  30.8KiB           std? <core::marker::PhantomData<T> as serde_core::de::DeserializeSeed>::deserialize
 0.2%   0.4%  30.7KiB           prek prek::cli::run::run::run::{{closure}}
 0.2%   0.4%  29.8KiB           prek prek::languages::rust::installer::RustInstaller::install::{{closure}}
 0.2%   0.4%  28.4KiB           prek prek::languages::node::installer::NodeInstaller::install::{{closure}}
 0.2%   0.4%  27.9KiB             h2 h2::proto::connection::DynConnection<B>::recv_frame
 0.2%   0.3%  27.6KiB           prek prek::identify::by_extension::{{closure}}
 0.2%   0.3%  25.7KiB           prek prek::cli::run::run::run_hooks::{{closure}}
 0.1%   0.3%  25.3KiB           prek prek::main
 0.1%   0.3%  24.4KiB     hyper_util hyper_util::client::legacy::client::Client<C,B>::send_request::{{closure}}
 0.1%   0.3%  24.3KiB        globset globset::GlobSetBuilder::build
41.2%  88.6%   6.9MiB                And 10633 smaller methods. Use -n N to show more.
46.5% 100.0%   7.7MiB                .text section size, the file size is 16.7MiB

Base Branch Results

 File  .text     Size          Crate Name
 0.6%   1.4% 107.3KiB          prek? <prek::cli::Command as clap_builder::derive::Subcommand>::augment_subcommands
 0.6%   1.3% 100.6KiB           prek prek::languages::<impl prek::config::Language>::run::{{closure}}::{{closure}}
 0.3%   0.7%  54.7KiB           prek prek::archive::unpack::{{closure}}
 0.3%   0.7%  52.8KiB             h2 h2::proto::connection::Connection<T,P,B>::poll
 0.2%   0.5%  39.2KiB          prek? <prek::cli::RunArgs as clap_builder::derive::Args>::augment_args
 0.2%   0.5%  38.4KiB           prek prek::run::{{closure}}
 0.2%   0.5%  38.3KiB           prek prek::languages::<impl prek::config::Language>::install::{{closure}}
 0.2%   0.5%  37.3KiB          hyper hyper::proto::h1::dispatch::Dispatcher<D,Bs,I,T>::poll_loop
 0.2%   0.5%  36.9KiB regex_automata regex_automata::meta::strategy::new
 0.2%   0.5%  36.5KiB           prek prek::workspace::Workspace::discover
 0.2%   0.4%  30.8KiB           std? <core::marker::PhantomData<T> as serde_core::de::DeserializeSeed>::deserialize
 0.2%   0.4%  30.7KiB           prek prek::cli::run::run::run::{{closure}}
 0.2%   0.4%  29.8KiB           prek prek::languages::rust::installer::RustInstaller::install::{{closure}}
 0.2%   0.4%  28.4KiB           prek prek::languages::node::installer::NodeInstaller::install::{{closure}}
 0.2%   0.4%  27.9KiB             h2 h2::proto::connection::DynConnection<B>::recv_frame
 0.2%   0.3%  27.6KiB           prek prek::identify::by_extension::{{closure}}
 0.1%   0.3%  25.4KiB           prek prek::main
 0.1%   0.3%  24.4KiB     hyper_util hyper_util::client::legacy::client::Client<C,B>::send_request::{{closure}}
 0.1%   0.3%  24.3KiB        globset globset::GlobSetBuilder::build
 0.1%   0.3%  24.2KiB     hyper_util hyper_util::client::legacy::client::Client<C,B>::connect_to::{{closure}}::{{closure}}::{{closure}}
41.1%  88.7%   6.9MiB                And 10614 smaller methods. Use -n N to show more.
46.4% 100.0%   7.7MiB                .text section size, the file size is 16.7MiB

[codecov]

Codecov Report

❌ Patch coverage is 96.95431% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.03%. Comparing base (93926c9) to head (e2f1293).
⚠️ Report is 9 commits behind head on master.

Files with missing lines	Patch %	Lines
crates/prek/src/cli/run/run.rs	97.70%	6 Missing ⚠️
crates/prek/src/cli/auto_update.rs	16.66%	5 Missing ⚠️
crates/prek/src/languages/mod.rs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1232      +/-   ##
==========================================
+ Coverage   89.84%   90.03%   +0.18%     
==========================================
  Files          79       80       +1     
  Lines       15264    15627     +363     
==========================================
+ Hits        13714    14069     +355     
- Misses       1550     1558       +8     

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[Copilot]

Pull request overview

This PR implements priority-based parallel execution for hooks, allowing hooks with the same priority value to run concurrently while maintaining sequential execution for hooks with different priorities. When no priority is specified, hooks automatically receive a unique priority based on their index in the configuration file, preserving backward-compatible sequential behavior.

Key changes:

• Added priority field to hook configuration (type u32, defaults to hook index)
• Hooks with same priority run in parallel, subject to global concurrency limits
• New grouped output UI for parallel hooks that modify files
• Enhanced progress reporting during hook execution

Reviewed changes

Copilot reviewed 31 out of 31 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
docs/proposals/concurrency.md	New design proposal documenting priority-based parallel execution model
docs/diff.md	Added documentation about parallel execution by priority
docs/configuration.md	Added priority field documentation with examples
docs/README.md	Added feature note about parallel hook execution
crates/prek/src/config.rs	Added priority field to HookOptions struct
crates/prek/src/hook.rs	Added priority field to Hook struct with auto-assignment logic
crates/prek/src/cli/run/run.rs	Refactored hook execution to support priority groups and parallel execution
crates/prek/src/cli/reporter.rs	Added HookRunReporter for progress tracking during hook execution
crates/prek/src/languages/*.rs	Updated all language implementations to accept reporter parameter
crates/prek/src/run.rs	Simplified result collection using try_collect
crates/prek/tests/run.rs	Added comprehensive tests for priority ordering, fail-fast, and grouped output
Cargo.toml	Moved textwrap to dev-dependencies (no longer used in production)
crates/prek/Cargo.toml	Updated dependency configuration
Various test files	Updated snapshots for new output format

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