Change wallpeper from CLI

wallpaper.sh

#!/bin/sh

# resolve $PATH
export PATH=$HOME/.nvm/versions/node/v8.9.2/bin/:$PATH
export PATH=$HOME/bin/:$PATH
export PATH=/usr/local/bin/:$PATH

# Fetch current song picture from spotify.
spotify share | sed -e '2d' -e 's/^SpotifyURI://' | xargs -ISONG_URL curl -X GET https://open.spotify.com/oembed\?url\=SONG_URL | jq '.thumbnail_url' | xargs -IIMAGE_URL wget IMAGE_URL -O ~/Pictures/spotify-wallpaper.jpg

# デスクトップピクチャは同一ファイル名への変更ができないので、一度別のものに変える
osascript<<END
tell application "System Events"
    tell current desktop
        set picture to "~/Pictures/placeholder.png"
    end tell
end tell
END

# Sleepなしで実行すると、どちらかのピクチャ変更処理がキャンセルされる
sleep 1

osascript<<END
tell application "System Events"
    tell current desktop
        set picture to "~/Pictures/spotify-wallpaper.jpg"
    end tell
end tell
END