#!/bin/sh
set -eu

uuid() {
	# Taken from:
	# https://serverfault.com/a/799198
	od -xN20 /dev/urandom | \
		head -1 | \
		awk '{OFS="-"; print $2$3,$4,$5,$6,$7$8$9}'
}

insert_at_line() {
  N="$1"
  F="$2"
	TMP="$(mktemp)"
  printf '%s\n\n%s\n\n%s\n' \
    "$(head "-n$N" "$F")" \
    "$(cat -)" \
    "$(tail "-n+$((N+1))" "$F")" \
    > "$TMP"
	mv "$TMP" "$F"
}

SHORT=
while getopts 'c' flag; do
	case "$flag" in
		c)
			SHORT=1
			;;
		*)
			;;
	esac
done

TITLE="${1:-FIXME}"
ID="#task-$(uuid)"
TITLE_LINE="$(printf '## TODO %s {%s}\n- TODO in %s\n' "$TITLE" "$ID" "$(date -I)")"

if [ "$SHORT" = '1' ] && [ "$TITLE" != 'FIXME' ]; then
  echo "$TITLE_LINE" | insert_at_line 2 TODOs.md
else
  printf '%s\n\n---\n\nFIXME\n' "$TITLE_LINE" | vipe | insert_at_line 2 TODOs.md
fi

git reset .
git add TODOs.md
git commit -m "TODOs.md: Add $ID"