diary

#!/usr/bin/env bash

# global tnutil variables
tags_dir=${TNU_TAG_DIR:-$HOME/tags}
store_dir=${TNU_STORE_DIR:-$HOME/store}
date=$(date -I)
today=$store_dir/$date

err() {
	printf 'an error occured: %s' "$1"
	exit 1
}

parseargs() {
	while [ $# -gt 0 ]
	do
		arg=$1
		case $arg in
			# handle options
			-s|--store-dir)
				store_dir=$2
				test -d "$store_dir" ||
					err "$arg must specify a valid directory"
				shift
				;;
			-t|--tags-dir)
				tags_dir=$2
				test -d "$tags_dir" ||
					err "$arg must specify a valid directory"
				shift
			  ;;
			# treat all other flags as basic switches and set a new variable
			# with the same name as the switch to the value of "true"
			# do this for both short and long options
			-?)
				opt="${arg:1}";
				printf -v "$opt" '%s' "true" 2> /dev/null ||
					err "Invalid switch: $arg" # printf will likely only fail if
																		 # $opt is an invalid variable name
				;;
			--*)
				opt="${arg:2}"
				printf -v "$opt" '%s' "true" 2> /dev/null ||
					err "Invalid switch: $arg"
				;;
			@*) tags+=("${arg:1}") ;;
			*) err "Invalid arg: $arg" ;;
		esac
		shift
	done
}

# Script-specific variables
diary_file="$today/today.md"
tags=("diary")

# Flags
v=

parseargs "$@"

[ "$v" ] && printf 'args passed: %s\n' "$*"

[ -d "$today" ] || mkdir -p "$today"
if [ -f "$diary_file" ]; then
	$VISUAL "$diary_file"
else
	touch "$diary_file"
	[ -d "$tags_dir/diary" ] || mkdir -p "$tags_dir/diary"
	$VISUAL "$diary_file"
fi

for tag in "${tags[@]}"
do
	[ -d "$tags_dir/$tag" ] || (
		mkdir -p "$tags_dir/$tag" &&
		[ "$v" ] &&
		printf 'tag "%s" does not exist\n Creating tag directory: %s\n' "$tag" "$tags_dir/$tag"
	)
	link="$tags_dir/$tag/$date.md"
	[ -h "$link" ] || (
		ln -sr "$diary_file" "$link" &&
		[ "$v" ] &&
		printf 'Creating symlink for tag: %s\n' "$tag"
	)
done