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| 1 | + | #!/bin/bash | |
| 2 | + | # rustfmt gate: blocks a commit whose staged Rust files are not formatted. | |
| 3 | + | # | |
| 4 | + | # Activate in a fresh clone (one-time): | |
| 5 | + | # git config core.hooksPath scripts/githooks | |
| 6 | + | # | |
| 7 | + | # Bypass for a work-in-progress commit: git commit --no-verify | |
| 8 | + | # | |
| 9 | + | # Only crates with staged .rs changes are checked, so the hook stays fast on a | |
| 10 | + | # large repo. Each file maps to the nearest enclosing Cargo.toml, and the check | |
| 11 | + | # runs as `cargo fmt` there, which picks up that crate's edition and any | |
| 12 | + | # rustfmt.toml rather than guessing. | |
| 13 | + | set -euo pipefail | |
| 14 | + | ||
| 15 | + | ROOT="$(git rev-parse --show-toplevel)" | |
| 16 | + | cd "$ROOT" | |
| 17 | + | ||
| 18 | + | # Paths the gate ignores (extended regex, matched against repo-relative paths). | |
| 19 | + | # Empty means check everything. | |
| 20 | + | SKIP_PATHS="${SKIP_PATHS:-}" | |
| 21 | + | ||
| 22 | + | staged="$(git diff --cached --name-only --diff-filter=ACMR -- '*.rs')" | |
| 23 | + | if [ -n "$SKIP_PATHS" ]; then | |
| 24 | + | staged="$(printf '%s\n' "$staged" | grep -Ev "$SKIP_PATHS" || true)" | |
| 25 | + | fi | |
| 26 | + | [ -n "$staged" ] || exit 0 | |
| 27 | + | ||
| 28 | + | # Map each staged file to the directory of its nearest Cargo.toml. | |
| 29 | + | crates="" | |
| 30 | + | while IFS= read -r f; do | |
| 31 | + | [ -n "$f" ] || continue | |
| 32 | + | d="$(dirname "$f")" | |
| 33 | + | while [ "$d" != "." ] && [ ! -f "$d/Cargo.toml" ]; do | |
| 34 | + | d="$(dirname "$d")" | |
| 35 | + | done | |
| 36 | + | [ -f "$d/Cargo.toml" ] || continue | |
| 37 | + | crates="$crates$d"$'\n' | |
| 38 | + | done <<< "$staged" | |
| 39 | + | ||
| 40 | + | crates="$(printf '%s' "$crates" | sort -u)" | |
| 41 | + | [ -n "$crates" ] || exit 0 | |
| 42 | + | ||
| 43 | + | failed=0 | |
| 44 | + | while IFS= read -r c; do | |
| 45 | + | [ -n "$c" ] || continue | |
| 46 | + | if ! (cd "$c" && cargo fmt --check >/dev/null 2>&1); then | |
| 47 | + | echo "pre-commit: rustfmt gate failed in $c" | |
| 48 | + | failed=1 | |
| 49 | + | fi | |
| 50 | + | done <<< "$crates" | |
| 51 | + | ||
| 52 | + | if [ "$failed" -ne 0 ]; then | |
| 53 | + | echo "pre-commit: run 'cargo fmt' in the crates above, then restage." | |
| 54 | + | echo "pre-commit: commit aborted (use --no-verify to bypass)." | |
| 55 | + | exit 1 | |
| 56 | + | fi | |
| 57 | + | ||
| 58 | + | echo "pre-commit: rustfmt gate clean." |