#!/usr/bin/env bash
# Rebuild objects/_index.md from card frontmatter.
#
# The index is generated, never hand-edited: a hand-curated index drifts, a derived one
# cannot. Run after adding, moving, or re-verifying any object card.

set -euo pipefail

map_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
objects_dir="${map_dir}/objects"
out="${objects_dir}/_index.md"

field() { awk -v k="^$2:" '$0 ~ k { sub(/^[^:]*: */, ""); print; exit }' "$1"; }

{
  echo "# Object index"
  echo
  echo "One line per noun. Open the card, not the folder."
  echo
  echo "_Generated by \`_meta/build-index.sh\` from card frontmatter. Do not hand-edit._"
  echo
  echo "| Noun | Cluster | Universe | Status | Owning file |"
  echo "|---|---|---|---|---|"

  find "$objects_dir" -name '*.md' ! -name '_index.md' ! -name 'CONTEXT.md' \
    | sort | while read -r f; do
      rel="${f#"${objects_dir}"/}"
      name=$(awk '/^# /{ sub(/^# /, ""); print; exit }' "$f")
      printf '| [%s](%s) | %s | %s | %s | `%s` |\n' \
        "$name" "$rel" "$(field "$f" cluster)" "$(field "$f" universe)" \
        "$(field "$f" status)" "$(field "$f" entity)"
    done
} > "$out"

echo "wrote $out ($(grep -c '^| \[' "$out") cards)"