#!/usr/bin/env bash
# Lookup a term or usage guidance in the Google Style Guide word-list.md.
# Usage: ./lookup-word.sh <term>

set -euo pipefail

if [[ $# -eq 0 ]]; then
  echo "Usage: $(basename "$0") <term>" >&2
  exit 1
fi

script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
word_list="$script_dir/word-list.md"

if [[ ! -f "$word_list" ]]; then
  echo "Error: word-list.md not found at $word_list" >&2
  exit 1
fi

pattern="$*"

awk -v pat="$pattern" '
  BEGIN { IGNORECASE=1 }
  /^- \*\*/ {
    if (match_entry) { print entry "\n" }
    match_entry = 0
    entry = $0
    if ($0 ~ pat) match_entry = 1
    next
  }
  {
    if (entry != "") entry = entry "\n" $0
    if ($0 ~ pat) match_entry = 1
  }
  END {
    if (match_entry) print entry
  }
' "$word_list"