#!/bin/bash
# This script is intended to be run via cron.

# It creates a folder structure in home for the current date in the following format:
# $HOME/<Tag>/<Year>/<Month>/<Day>

# It also sets up a symlink for the tagged folder.
# This symlink will always point to the folder for the current date.

# Finally, it removes any folders without data, to prevent clutter.

LD_INTERNAL=1
. $(dirname $(realpath $0))/daisy.source

if [[ $1 == '' ]]; then
  echo "Usage: $LD_BIN <folder>"
  echo "Creates a folder within '.daisy' in the current directory containing"
  echo "a tree of dates associated with the folder name given by argument."
  echo "A symlink is (re-)created at the same time with the same folder name."
  echo "For example, if given the folder 'notes', this utility will:"
  echo "- Create a folder '/.daisy/notes/<year>/<month>/<day>'."
  echo "- Create a symlink named 'notes' that points to it."
  echo "It is recommended to run this via cron."
  exit 1
fi

root_dir=$(dirname $1)/.daisy/$(basename $1)
today_sym=$1

# Present day
today=$(date -I)
year=$(echo $today | awk -F"-" '{print $1}')
month=$(echo $today | awk -F"-" '{print $2}')
day=$(echo $today | awk -F"-" '{print $3}')

set -e

function errorFn()
{
  error=$?
  if [[ $error -gt 0 ]];
  then
    echo "$LD_BIN error ($error): "
    perl -E 'say $!=shift' $error
  fi
  exit $error
}

# Error handling
trap errorFn ERR

# First we clear out empty folders, and remove the symlink if it exists
test -e "$root_dir" &&	find "$root_dir" -maxdepth 3 -type d -empty -print | xargs rm -rf
test -L "$today_sym" && rm -rf "$today_sym"

# Now we can set up today's directory
mkdir -p "$root_dir/$year/$month/$day"
ln -s "$root_dir/$year/$month/$day" "$today_sym"
exitcode=@?