Avoid running git diff for skipped hooks

[j178]

For #1327

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.05%. Comparing base (c1ec7c8) to head (4cdf2f0).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1335   +/-   ##
=======================================
  Coverage   90.05%   90.05%           
=======================================
  Files          80       80           
  Lines       15910    15915    +5     
=======================================
+ Hits        14328    14333    +5     
  Misses       1582     1582           

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[github-actions]

📦 Cargo Bloat Comparison

Binary size change: -0.60% (16.7 MiB → 16.6 MiB)

Expand for cargo-bloat output

Head Branch Results

 File  .text     Size          Crate Name
 0.7%   1.5% 115.5KiB           prek prek::languages::<impl prek::config::Language>::run::{{closure}}::{{closure}}
 0.6%   1.3% 107.3KiB          prek? <prek::cli::Command as clap_builder::derive::Subcommand>::augment_subcommands
 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%  39.8KiB           prek prek::languages::<impl prek::config::Language>::install::{{closure}}
 0.2%   0.5%  39.2KiB          prek? <prek::cli::RunArgs as clap_builder::derive::Args>::augment_args
 0.2%   0.5%  39.2KiB           prek prek::run::{{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%  30.8KiB           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%  28.4KiB             h2 h2::proto::connection::DynConnection<B>::recv_frame
 0.2%   0.3%  27.6KiB           prek prek::identify::by_extension::{{closure}}
 0.2%   0.3%  27.3KiB           prek prek::cli::run::run::run_hooks::{{closure}}
 0.2%   0.3%  26.2KiB           prek prek::cli::auto_update::update_repo::{{closure}}
 0.1%   0.3%  24.9KiB     hyper_util hyper_util::client::legacy::client::Client<C,B>::connect_to::{{closure}}::{{closure}}::{{closure}}
 0.1%   0.3%  24.7KiB           prek prek::hook::HookBuilder::build::{{closure}}
41.3%  88.5%   6.9MiB                And 10646 smaller methods. Use -n N to show more.
46.7% 100.0%   7.8MiB                .text section size, the file size is 16.6MiB

Base Branch Results

 File  .text     Size          Crate Name
 0.7%   1.5% 115.5KiB           prek prek::languages::<impl prek::config::Language>::run::{{closure}}::{{closure}}
 0.6%   1.3% 107.3KiB          prek? <prek::cli::Command as clap_builder::derive::Subcommand>::augment_subcommands
 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%  39.8KiB           prek prek::languages::<impl prek::config::Language>::install::{{closure}}
 0.2%   0.5%  39.2KiB          prek? <prek::cli::RunArgs as clap_builder::derive::Args>::augment_args
 0.2%   0.5%  39.2KiB           prek prek::run::{{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%  30.8KiB           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%  28.4KiB             h2 h2::proto::connection::DynConnection<B>::recv_frame
 0.2%   0.3%  27.6KiB           prek prek::identify::by_extension::{{closure}}
 0.2%   0.3%  27.3KiB           prek prek::cli::run::run::run_hooks::{{closure}}
 0.2%   0.3%  26.2KiB           prek prek::cli::auto_update::update_repo::{{closure}}
 0.1%   0.3%  24.9KiB     hyper_util hyper_util::client::legacy::client::Client<C,B>::connect_to::{{closure}}::{{closure}}::{{closure}}
 0.1%   0.3%  24.7KiB           prek prek::hook::HookBuilder::build::{{closure}}
41.3%  88.5%   6.9MiB                And 10644 smaller methods. Use -n N to show more.
46.7% 100.0%   7.8MiB                .text section size, the file size is 16.7MiB

[Copilot]

Pull request overview

This PR optimizes the hook execution logic by avoiding unnecessary git diff operations when all hooks in a priority group are skipped. This improves performance by reducing file system operations.

Changes:

• Added logic to skip git diff when all hooks in a group are skipped (DryRun, NoFiles, or Unimplemented status)
• Changed semaphore from Arc to Rc for better performance in single-threaded async context
• Added is_skipped() helper method to RunStatus enum
• Minor optimizations: removed redundant success = false assignment and changed to sort_unstable_by

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