Cosmic Weather Applet

A weather applet for the COSMIC desktop environment that displays current conditions in the panel and a full forecast in a popup. Weather data is provided by wttr.in using IP-based geolocation.

Building

Requires a Rust toolchain and the following system dependencies:

# Debian/Ubuntu
sudo apt-get install pkg-config libxkbcommon-dev libwayland-dev

Install Rust via rustup if needed, then:

cargo build --release

Testing

For development, cargo run launches the applet in a standalone window in the center of the display. It behaves the same as when embedded in the panel.

cargo run

Deploying

To deploy to your local user session, build a release binary, replace the running instance, and restart the panel so it picks up the new binary:

cargo build --release
cp target/release/cosmic-weather-applet ~/.local/bin/
# Restart the applet and panel
killall cosmic-weather-applet
killall cosmic-panel

The panel will relaunch automatically and load the updated applet.

Configuration

Temperature and wind units

By default, the applet lets wttr.in pick units based on your IP-based location (so users in the US get Fahrenheit, everyone else gets Celsius).

At startup the applet additionally inspects your measurement locale (LC_MEASUREMENT, then LC_ALL, then LANG). Locales in the US, Liberia, the Bahamas, Belize, the Cayman Islands, and Palau are requested as Fahrenheit / USCS; all other locales fall through to the wttr.in default.

To override the choice explicitly, set COSMIC_WEATHER_UNITS:

Value	Meaning
u	Fahrenheit, mph (USCS)
m	Celsius, km/h (metric)
M	Celsius, m/s
auto	(or unset) Use locale / geolocation

Because the applet is launched by cosmic-panel, a persistent override is easiest to set on that service, e.g.:

systemctl --user edit cosmic-panel
# In the override file:
# [Service]
# Environment=COSMIC_WEATHER_UNITS=u

systemctl --user restart cosmic-panel

Changes take effect after the applet is restarted.

Localization

Fluent is used for localization. Translation files are in the i18n directory. To add a new language, copy the English (en) localization, rename the directory to the target ISO 639-1 language code, and translate the message values.