#!/usr/bin/env 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

dir=$(realpath -s "$1")
parent_dir=$(dirname "$dir")
name=$(basename "$dir")
root_dir="$parent_dir/.daisy/$name"
today_sym="$dir"

# Present day
read year month day < <(date "+%Y %m %d")
today="$root_dir/$year/$month/$day"

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 -delete

# Now we can set up today's directory
mkdir -p "$today"
ln -snf "$today" "$today_sym"
ln -snf "$root_dir" "$dir/.tree"
exitcode=$?