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siftlode/scripts/lint-changed.sh
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#!/usr/bin/env bash
# The fast lint lanes on the uncommitted files only — ruff (check + format) on Python, eslint +
# prettier on the frontend — for a check after every edit instead of a full gate run. It is a
# convenience, never the gate: scripts/check.sh stays what a merge or a release requires.
#
# bash scripts/lint-changed.sh lint what `git status` shows as changed or new
# bash scripts/lint-changed.sh --hook the same, as a Claude Code Stop hook: silent and exit 0 when
# clean; otherwise the findings on stderr and exit 2, which
# hands them back to the agent before it ends its turn
#
# Measured 2026-10-04: one cold eslint run (type-aware) takes 3.4–4.7 s, so this runs once per turn
# (Stop), not after every edit — a warm daemon (eslint_d) would add a dependency and a stray process.
set -u
cd "$(dirname "$0")/.." || exit 2
hook=0
[ "${1:-}" = --hook ] && hook=1
if [ "$hook" = 1 ]; then
# A Stop hook that blocked once is told so on the next stop; let that one through, or an unfixable
# finding would keep the agent in a loop.
grep -q '"stop_hook_active": *true' && exit 0
fi
mapfile -t changed < <(git status --porcelain --untracked-files=all | sed -E 's/^.. //; s/.* -> //' |
while read -r f; do [ -f "$f" ] && printf '%s\n' "$f"; done)
py=() fe=()
for f in "${changed[@]}"; do
case "$f" in
backend/*.py | scripts/*.py) py+=("$f") ;;
frontend/*.ts | frontend/*.tsx | frontend/*.js | frontend/*.mjs) fe+=("${f#frontend/}") ;;
esac
done
report="$(
if [ ${#py[@]} -gt 0 ]; then
python -m ruff check --quiet --config backend/ruff.toml "${py[@]}" 2>&1
python -m ruff format --check --quiet --config backend/ruff.toml "${py[@]}" 2>&1
fi
if [ ${#fe[@]} -gt 0 ]; then
(cd frontend && npx eslint --max-warnings 0 "${fe[@]}" 2>&1)
(cd frontend && npx prettier --check --log-level warn "${fe[@]}" 2>&1)
fi
)"
if [ -z "$report" ]; then
[ "$hook" = 1 ] || echo "lint-changed: clean (${#py[@]} py, ${#fe[@]} frontend)"
exit 0
fi
if [ "$hook" = 1 ]; then
printf 'lint-changed found problems in the uncommitted files:\n%s\n' "$report" >&2
exit 2
fi
printf '%s\n' "$report"
exit 1