write-one-line

#!/usr/bin/env bash

set -euo pipefail

book="pan-tadeusz-adam-mickiewicz.md"

source ./_pointer

if [ "$pointer" -eq 0 ]; then
  exit 1
fi

line=$(sed -n "${pointer}p" src.md)
commit_message=$(echo -n "$line" | tr -d "\n" | tr -d "\r")
line=$(echo -n "$commit_message" | sed -E "s/^    /\ \ \ \ /")

if [[ ${line:0:1} == "#" ]] || [[ ${line:0:1} == ">" ]]; then
  # if it's a heading, or blokquote, do not append "enter"
  echo -e "$line\n$(cat "$book")" > "$book"
elif [[ $line == "" ]]; then
  # if the line is empty, do not append the "enter"
  echo -e "\n$(cat "$book")" > "$book"
else
  next=$((pointer + 1))
  next_line=$(sed -n "${next}p" src.md)
  next_line=$(echo -n "$next_line" | tr -d "\n" | tr -d "\r")
  if [[ $next_line == "" ]]; then
    # if the next line was empty, do not append "enter"
    echo -e "$line\n$(cat "$book")" > "$book"
  else
    echo -e "$line\\\\\n$(cat "$book")" > "$book"
  fi
fi

[ "$commit_message" == "" ] && commit_message="_"

pointer=$((pointer - 1))
echo "pointer=$pointer" > _pointer
git add "$book"
git commit -m "$commit_message"
#git push origin main