#! /bin/bash

main() (
   set -ueo pipefail

   if [ ! -f ./raw.md.gz ]; then
      wget -q -O - https://raw.githubusercontent.com/ZachGoldberg/Startup-CTO-Handbook/main/StartupCTOHandbook.md \
      | gzip \
      > ./raw.md.gz
   fi

   rm -f ./src/* || true
   mkdir -p ./src

   printf "# Summary\n\n" > ./src/SUMMARY.md


   cat ./raw.md.gz \
   | gzip -d \
   | (
      n=0
      n_f() {
         printf %03d.txt $n
      }
      while read -r line; do
         local depth=$(
            echo "$line" \
            | grep -o -E '^[^a-z]*#+ ' \
            | grep -o '#' \
            | wc -l \
            | awk '{print $1}'
         )
         case "$depth" in
            1|2 )
               n=$((n+1))
               printf "%s- [%s](%s)\n" \
                  "$(
                     i=0
                     while ((i<depth-1)); do
                        printf "  "
                        i=$((i+1))
                     done
                  )" \
                  "${line#* }" \
                  "$(n_f)" \
               | tee -a ./src/SUMMARY.md >&2
            ;;
         esac
         echo "$line" | tee -a "./src/$(n_f)" &> /dev/null
      done
   )


   mdbook build

)

log() {
   echo "| $*" >&2
}

if [ "$0" == "$BASH_SOURCE" ]; then
   main "$@"
   ret=$?
   echo ret=$? >&2
   exit $ret
fi