retrieve-bing-wallpapers.bash

#!/bin/bash

### Usage:
### $ env RESOLUTION=UHD NDAYSAGO=1 COUNT=10 MARKET=ja-JP SAVETO=$HOME/Bing sh download_bing_wallpaper.sh

set -euo pipefail

RESOLUTION=${RESOLUTION:-1920x1080} # Possible values: 1920x1080, 1366x768, UHD

NDAYSAGO=${NDAYSAGO:-0}

COUNT=${COUNT:-1}

MARKET=${MARKET:-ja-JP}

SAVETO=${SAVETO:-"${HOME}""/Pictures/Bing"}

API_URL="http://www.bing.com/HPImageArchive.aspx"

mkdir -p "${SAVETO}"

curl -sSLG -d 'format=js' -d "resolution=${RESOLUTION}" -d "mkt=${MARKET}" -d "idx=${NDAYSAGO}" -d "n=${COUNT}" "${API_URL}" |
jq -c '.images[] | {urlbase, copyright, title}' |
while read -r entry ; do
    urlbase=$(printf '%s' "${entry}" | jq -r '.urlbase')
    basename="${urlbase#/th?id=}"
    imgfile="${basename}_${RESOLUTION}.jpg"
    descfile="${basename}.txt"

    [ -f "${SAVETO}/${descfile}" ] || (printf '%s' "${entry}" | jq -r '.copyright, .title' | tee "${SAVETO}/${descfile}")
    [ -f "${SAVETO}/${imgfile}" ] || curl -sSLo "${SAVETO}/${imgfile}" "https://www.bing.com/th?id=${imgfile}"
done