get_38cm_bars_from_wiggle.bash

#!/usr/bin/env bash

set -euo pipefail

CURL="${CURL_COMMAND:-curl -sS}"

main() {
  local bar_url

  check_our_dependencies

  for bar_url in $(handlebar_urls) ; do
    if $CURL "$bar_url" | has_size_38cm ; then
      echo "$bar_url"
    fi
  done
}

check_our_dependencies() {
  for prog in curl cut jq ; do
    if ! command -v "$prog" > /dev/null ; then
      fail "We need $prog installed for this to work"
    fi
  done
}

handlebar_urls() {
  get_all_bars | filter_product_links
}

has_size_38cm() {
  has_size "38cm"
}

has_size() {
  size="${1:?Expected a size to check}"
  grep 'window\.universal_variable\.product = ' \
    | cut -d= -f2- \
    | jq -e "$(printf '.skus[].size | select(. == "%s")' "$size")" > /dev/null
}

get_all_bars() {
  $CURL "https://www.wiggle.co.uk/cycle/drop-handlebars/?ris=1&o=2"
  $CURL "https://www.wiggle.co.uk/cycle/drop-handlebars/?o=2&g=49"
  $CURL "https://www.wiggle.co.uk/cycle/drop-handlebars/?o=2&g=97"
}

filter_product_links() {
  grep "<a class=\"bem-product-thumb__name" \
    | cut -d= -f3 | cut -d\" -f2
}

fail() {
  echo "${@}" >&2
}

main "${@}"