max / makeover

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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."
59