Dynamic Wallpaper

Change your wallpaper depending on the time of day and the position of the sun.

Requirements

• feh
• cargo, preferably through rustup
• Images that are numbered sequentially, for example
  • ~/.wallpaper/mojave-wallpaper/mojave_dynamic_{1..16}.jpeg

How to use it

Given your coordinates and some settings for the images, it will print out which image to use depending on the position of the sun.

Configuration

Place this in ~/.config/dynamic_wallpaper/config.toml:

# useful for debugging; defaults to now. Needs to be in RFC3339 format.
#now = "2018-08-31T01:45:00.123456789-05:00"
lat = 12.3456
lon = -65.4321

# these are the defaults
[wallpaper]
# Number of images to use during the day time.
day_images = 13
# Number of images to use at night. These follow the day time images.
night_images = 3

Here's my setup for how I use this. It uses feh(1) and a systemd timer.

Create a file called ~/.fehbg, and make it executable (chmod +x ~/.fehbg). Put this in it:

#!/bin/sh
feh --bg-fill --no-fehbg "$HOME/.wallpaper/mojave-wallpaper/mojave_dynamic_$(~/.cargo/bin/dynamic_wallpaper).jpeg"

~/.config/systemd/user/feh-wallpaper.service:

[Unit]
Description=Dynamic wallpaper with feh

[Service]
Type=oneshot
ExecStart=%h/.fehbg

~/.config/systemd/user/feh-wallpaper.timer:

[Unit]
Description=Dynamic wallpaper with feh

[Timer]
OnBootSec=1min
OnUnitActiveSec=10min
Unit=feh-wallpaper.service

[Install]
WantedBy=default.target

Running

Test it by running ~/.fehbg. If everything works, start and enable the systemd timer.

systemctl --user daemon-reload && systemctl --user enable --now feh-wallpaper.timer

Inspired by the Dynamic Desktop feature in macOS Mojave.