#!/bin/bash

# Copyright (c) 2006, 2009, 2014, 2016 Peter Palfrader <peter@palfrader.org>
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

set -e
set -u

BASE="$HOME"
TGTDIR="$HOME/.litter"
WHITELIST="$HOME/.litter-whitelist"
RECENT="$HOME/recent" # make sure it's in the whitelist

YESTERDAY="$(date -d '1 day ago' '+%F')"
TGT="$TGTDIR/$YESTERDAY"

cd "$BASE"

if ! [ -e "$WHITELIST" ] ; then
  echo >&2 "You need to set up a whitelist of files to keep in $WHITELIST."
  exit 1
fi

mkdir -p "$TGT"

find -mindepth 1 -maxdepth 1 ! -name '.*' -printf '%f\0' |
  while read -d $'\0' fn; do
  if grep -q -F -x "$fn" "$WHITELIST"; then
    continue
  fi
  mv "$fn" "$TGT"
done
rmdir --ignore-fail-on-non-empty "$TGT"
if [ -e "$TGT" ] ; then
  ln -s --relative --no-dereference -f "$TGT" "$RECENT"
fi