99 lines
2.9 KiB
Plaintext
99 lines
2.9 KiB
Plaintext
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#!/bin/sh
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#
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# Reindent staged C sources to the canonical style before the commit is made.
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# See AGENTS.md -> "Coding Style".
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#
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# Enable with:
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# git config core.hooksPath scripts/hooks
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# Bypass a single commit with `git commit --no-verify`.
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#
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# The hook checks the *staged* content, not the working tree, so what gets
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# committed is what was verified. When a file needs reindenting it is fixed in
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# the working tree and re-staged -- but only when the working tree and the index
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# agree for that file. If they disagree (a partial `git add -p`), re-staging
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# would sweep unstaged work into the commit, so the hook stops and asks you to
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# do it yourself.
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set -eu
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root=$(git rev-parse --show-toplevel)
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reindent="$root/scripts/reindent.sh"
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# Leave conflict resolution alone.
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if [ -e "$root/.git/MERGE_HEAD" ]; then
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exit 0
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fi
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if [ ! -x "$reindent" ]; then
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echo "pre-commit: $reindent missing or not executable; skipping style check" >&2
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exit 0
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fi
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# Without Emacs the canonical style cannot be applied or even checked. Warn
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# rather than block: a hook that fails closed on a missing optional tool just
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# teaches everyone to pass --no-verify.
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if ! command -v emacs >/dev/null 2>&1; then
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echo "pre-commit: emacs not found; skipping reindent (see AGENTS.md)" >&2
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exit 0
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fi
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staged=$(git diff --cached --name-only --diff-filter=ACMR \
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| grep -E '^(src|include|tests|util)/.*\.[ch]$' \
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| grep -v -x -F 'include/akgl/SDL_GameControllerDB.h' || true)
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if [ -z "$staged" ]; then
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exit 0
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fi
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tmp=$(mktemp -d)
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trap 'rm -rf "$tmp"' EXIT INT TERM
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# Reindent a copy of each file's staged content and see whether it moves.
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needs=''
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for f in $staged; do
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copy="$tmp/$(printf '%s' "$f" | tr '/' '_')"
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git show ":$f" >"$copy"
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cp "$copy" "$copy.orig"
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if ! "$reindent" "$copy" >/dev/null 2>&1; then
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echo "pre-commit: reindent failed on $f; commit aborted" >&2
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exit 1
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fi
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if ! cmp -s "$copy" "$copy.orig"; then
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needs="$needs $f"
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fi
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done
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if [ -z "$needs" ]; then
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exit 0
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fi
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# Refuse to touch anything if even one file is partially staged.
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blocked=''
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for f in $needs; do
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if ! git diff --quiet -- "$f"; then
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blocked="$blocked $f"
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fi
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done
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if [ -n "$blocked" ]; then
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echo "pre-commit: these files need reindenting but have unstaged changes," >&2
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echo "so re-staging them would pull unstaged work into the commit:" >&2
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for f in $blocked; do echo " $f" >&2; done
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echo >&2
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echo "Reindent and stage them yourself, then commit again:" >&2
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echo " scripts/reindent.sh$(for f in $blocked; do printf ' %s' "$f"; done)" >&2
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echo " git add$(for f in $blocked; do printf ' %s' "$f"; done)" >&2
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exit 1
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fi
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# Safe: for every file needing work, the index and working tree agree.
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# shellcheck disable=SC2086
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"$reindent" $needs
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# shellcheck disable=SC2086
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git add $needs
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echo "pre-commit: reindented and re-staged:" >&2
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for f in $needs; do echo " $f" >&2; done
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exit 0
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