#!/usr/bin/env bash

set -o nounset
set -o errexit

readonly SOURCE=README.md
readonly OUTPUT=docs/documentation.md
readonly SECTIONS=(
  'Usage'
  'How do I get an `apiKey` and `indexName`?'
  'How does it work?'
)

function escape_regex {
  echo "$@" | sed -e 's/[]\/$*.^|[]/\\&/g'
}

function extract {
  local section=${1}

  echo
  sed -n "/^#\s*$(escape_regex $section)\s*$/,/^#[^#]/p" \
    | head -n -1
}

function main {
  rm -rf $OUTPUT && touch $OUTPUT

  echo "---" >> $OUTPUT
  echo "layout: page" >> $OUTPUT
  echo "title: Documentation" >> $OUTPUT
  echo "permalink: /documentation/" >> $OUTPUT
  echo "---" >> $OUTPUT

  for section in "${SECTIONS[@]}"; do
    cat $SOURCE | extract "$section" >> $OUTPUT
  done
}

main