jbrechtel
f74c431588
Installs a pre-commit hook that checks all staged .hs files are formatted by fourmolu before allowing a commit. Configured via core.hooksPath = .githooks. Run: ./hs fourmolu -i <files> to format
23 lines
954 B
Bash
Executable File
23 lines
954 B
Bash
Executable File
#!/usr/bin/env bash
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# Pre-commit hook: format Haskell sources with fourmolu before each commit.
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# Aborts the commit if formatting changes are needed.
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#
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# To install: make sure .githooks is CONFIGURED as the hooks directory
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# in git config (or copy this to .git/hooks/pre-commit).
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set -euo pipefail
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# Only run if fourmolu is available (skips on systems without the hs wrapper)
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if command -v ./hs &>/dev/null && ./hs fourmolu --version &>/dev/null 2>&1; then
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# Check which .hs files are staged for commit
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STAGED_FILES=$(git diff --cached --name-only --diff-filter=ACM | grep '\.hs$' || true)
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if [ -n "$STAGED_FILES" ]; then
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# shellcheck disable=SC2086
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if ! ./hs fourmolu -m check $STAGED_FILES >/dev/null 2>&1; then
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echo "❌ Formatting check failed. Run the following to fix:"
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echo " ./hs fourmolu -i $STAGED_FILES"
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echo " git add $STAGED_FILES"
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exit 1
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fi
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fi
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fi
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