Add feature to do a temporary stash

[KShivendu]

Description

A lot of times we have extra local files that either:

• We want to only commit/push some changes at at time to organize into multiple small commits/PRs
• We don't want to commit ever - local experiments

But then hooks (clippy/fmt) are executed on the whole code locally and but only on those "partial changes" in CI. The CI might fail because we missed pushing/commiting some other files.

Value

Shipping smaller and cleaner commit/PRs with confidence. Fewer CI failures.

Workaround:

I currently do this with bash but it would be great if rusty-hook does it internally with just a flag. Would more people discover this approach/trick:

#!/bin/bash

COMMAND="$1"
shift  # Remove first argument, rest are passed to the command

# Check if there are unstaged changes
STASHED=0
if ! git diff --quiet; then
    echo "🗃️  Stashing unstaged changes..."
    git stash push -m "rusty-hook temporary stash" --keep-index --include-untracked
    STASHED=1
fi

# Function to restore stash on exit
restore_stash() {
    if [ "$STASHED" = "1" ]; then
        echo "📦 Restoring stashed changes..."
        if git stash list | grep -q "rusty-hook temporary stash"; then
            git stash pop
        else
            echo "⚠️  Warning: Could not find stash to restore"
        fi
    fi
}

# Set trap to restore stash on exit (success or failure)
trap restore_stash EXIT

# Run the actual command and capture its exit status
set -e  # Exit on error
echo "🚀 Running: $COMMAND $*"
eval "$COMMAND $*"

# Trigger directly with rusty-hook run --hook <pre-commit|pre-push>

[hooks]
pre-commit = "./tools/git-hook.sh 'cargo +nightly fmt --all -- --check'"
pre-push = "./tools/git-hook.sh 'cargo clippy --all-targets --all-features -- -D warnings'"

[logging]
verbose = true