#!/bin/sh
# Pre-commit: the docs pages under apps/docs/content are generated from work/1
# by `bun run sync`, and deploy.yml publishes whatever main holds. Regenerate
# them now and stage what sync changed, so a solution and its page land in the
# same commit and a stale `## Solution` never reaches main.
#
# Sync reads the working tree, not the index, so the pages it writes only
# match this commit when work/1 has nothing unstaged: an untracked or
# half-staged solution would ship a page whose source is not in the commit.
# In that case refuse and say what to stage.
#
# Only paths that became dirty during sync are staged. Anything already dirty
# beforehand (hand-written `## Approach` prose in progress, a new index.mdx)
# stays where the author left it.
#
# Bypass for a deliberate partial commit: git commit --no-verify
set -eu

cd "$(git rev-parse --show-toplevel)"

unstaged=$(git status --porcelain -- work/1 | grep -v '^[MADR] ' || true)
if [ -n "$unstaged" ]; then
  printf 'pre-commit: work/1 has unstaged changes; stage or stash them so the generated pages match this commit:\n%s\n' "$unstaged" >&2
  exit 1
fi

before=$(mktemp)
trap 'rm -f "$before"' EXIT
git status --porcelain -- apps/docs/content | sort > "$before"
report=$(bun run --silent sync)
generated=$(git status --porcelain -- apps/docs/content | sort | comm -13 "$before" - | cut -c4-)
if [ -n "$generated" ]; then
  printf '%s\n' "$report" | grep -v 'skipped (in sync)' >&2
  printf '%s\n' "$generated" | xargs git add --
fi