#!/usr/bin/env bash
#
# Run this script in the top of a terraform folder to amend
# the README.md with terraform input/output tables.
#
# Usage: ./terraform-docs-update [target_dir]
#
set -euo pipefail

BANNER_START="<!-- terraform-docs-start -->"
BANNER_END="<!-- terraform-docs-end -->"
doc=README.md


cd "${1:-$PWD}"

if grep "$BANNER_START" "$doc" >/dev/null ; then
  if [[ -f "$doc.bak" ]]; then
    echo "$doc.bak file detected, aborting" >&2
    exit 1
  fi

  mv "$doc" "$doc.bak"
  {
    sed "/$BANNER_START/q" "$doc.bak"
    terraform-docs md .
    sed -n -e "/$BANNER_END/,\$p" "$doc.bak"
  } > "$doc"

  rm "$doc.bak"
else
  {
    echo "$BANNER_START"
    terraform-docs md .
    echo "$BANNER_END"
  } >> "$doc"
fi