#!/bin/bash
set -euo pipefail

usage() {
	printf "usage: %s [-c] [-p] [-h] [-x]\n" "$0"
	printf "\n"
	printf "Prompts for a one-line message, and appends to twtxt.txt. Optionally,\n"
	printf "commits and pushes a new post.\n"
	printf "\n"
	printf "Flags:\n"
	printf " -c     Commit\n"
	printf " -p     Push after commit (requires -c)\n"
	printf " -x     Enable trace (set -x)\n"
	printf " -h     Print (this) help message and exit\n"
}

commit=0	# commit or not, use -c to enable
push=0		# push after committing

while getopts cphx name
do
	case "$name" in
		c)
			commit=1
			;;
		p)
			push=1
			;;
		x)
			set -x
			;;
		h)
			usage "$0"
			exit 0
			;;
		?)
			usage "$0"
			exit 1
			;;
	esac
done

if (( $commit == 0 )) && (( $push == 1 )) ; then
	printf "$0: -p (push) required -c (commit)\n"
	exit 1
fi

printf "Type in your message, and finish by pressing Enter:\n"
read msg
printf "%s\t%s\n" "$(date -Im)" "${msg}" >> site/twtxt.txt

if (( $commit == 1 )) ; then
	msgprefix="${msg:0:20}"
	git add site/twtxt.txt
	git commit -m "twtxt: new post (${msgprefix}...)"
fi

(( $push == 1 )) && git push