#!/usr/bin/env bash

worklog_dir="worklog"
editor="subl"

show_usage () {
	cat <<-EOF
	Create a diary text file by week in the $worklog_dir subdirectory
	by the year and month. Automagically adds a heading to the file
	and opens the file with $editor to the current* date.

	A date other than now may be specified as the first argument.

	E.g.:
	./log.sh
	./log.sh "last saturday"
	EOF

}

if [[ "$*" == *"help"* || "$*" == *"-h"* ]]; then
	show_usage
	exit
fi


if ! year=$(date --date "${1:-now}" +%Y); then
	# Fail early
	show_usage
	exit
fi

month=$(date --date "${1:-now}" +%m)
day=$(date --date "${1:-now}" +%d)
weeknumber=$((($(date --date "${1:-now}" +%-d)-1)/7+1))
filename="$weeknumber.txt"
dayofweek=$(date --date "${1:-now}" +%A)
iso=$(date -Idate --date "${1:-now}")

# printf "year '$year' month '$month' day '$day' weeknumber '$weeknumber'\n"

mkdir -p "$HOME/$worklog_dir/$year/$month"
pushd "$HOME/$worklog_dir/$year/$month"
touch $filename

# Add a header for the date if it doesn't already exist
if ! grep -q "$iso" "$filename"; then
	echo "" >> $filename
	echo "$iso:" >> $filename
	echo "-$dayofweek" >> $filename
fi

linenumber=$(($(grep -n $iso $filename | cut -f1 -d:)+2))

case "$editor" in
	subl)
		# Hide guake terminal if we are using it
		type guake 2>/dev/null && guake --hide
		subl "$filename:$linenumber"
		;;
	nano)
		nano "+$linenumber" "$filename"
		;;
	vim)
		vim "+$linenumber" "$filename"
		;;
esac

popd