Backup Daily Windows Lockscreen Wallpaper (for Cygwin)

backup-daily-windows-lockscreen-wallpaper.sh

#!/usr/bin/env bash
# Requires: Cygwin
#
# SPDX-License-Identifier: MPL-2.0
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at https://mozilla.org/MPL/2.0/.
#
# (C) 2025, Pandu POLUAN


##### EDITABLE SECTION #####


DST_w="${USERPROFILE//\\/\\\\}"'\Pictures\Wallpapers'


##### DO NOT EDIT BELOW THIS LINE #####

DST="$(cygpath "${DST_w//\\/\\\\}")"

SRC_w="${USERPROFILE//\\/\\\\}"'\AppData\Local\Packages\Microsoft.Windows.ContentDeliveryManager_cw5n1h2txyewy\LocalState\Assets'
SRC="$(cygpath "$SRC_w")"

# Regex to extract the dimensions of the pic from the output of the `file` command
_RE_RES=", ([0-9]+)x([0-9]+)"

echo "Source: $SRC"
echo "Dest  : $DST"
mkdir -p "$DST"

cd "$SRC"
for f in *; do
    FMETA="$(file -b "$f")"
    # If not JPEG, skip
    if [[ ${FMETA:0:4} != "JPEG" ]]; then
        echo -n "."
        continue
    fi
    # If already exists, skip
    TARG="$DST"/"$f".jpeg
    if [[ -e "$TARG" ]]; then
        echo -n "!"
        continue
    fi
    # Only copy landscape format
    # WARNING: DO NOT enclose the vars here with quotes!!
    if [[ $FMETA =~ $_RE_RES ]]; then
        _w=${BASH_REMATCH[1]}
        _h=${BASH_REMATCH[2]}
        if (( _w > _h )); then
            cp "$f" "$TARG"
            echo -n "+"
        else
            echo -n "-"
        fi
    else
        echo -n "?"
    fi
done
echo