This extension is not maintained anymore. New maintainers are welcome!

And, many thanks to @eonpatapon for creating this awesome extension

gnome-shell-extension-caffeine-plus

Fill the cup to inhibit auto suspend and screensaver.

This extension supports gnome-shell 3.4 to 3.32:

* master: 3.2
* gnome-shell-3.10-3.30: 3.10 -> 3.30
* gnome-shell-before-3.10: 3.4 -> 3.8

White: Empty cup = normal auto suspend and screensaver. Filled cup = auto suspend and screensaver off. Green: No empty cup status. Filled cup = auto suspend and screensaver off always.

Installation from e.g.o

seems e.g.o did not approved my version, waiting long long time but pending only. following installation from git as well

https://extensions.gnome.org/extension/517/caffeine/

Installation from git

git clone git://github.com/qunxyz/gnome-shell-extension-caffeine.git
cd gnome-shell-extension-caffeine
./build.sh
cp -r [email protected] ~/.local/share/gnome-shell/extensions

Restart the shell and then enable the extension.

Development

git clone git://github.com/qunxyz/gnome-shell-extension-caffeine.git
cd gnome-shell-extension-caffeine
./build.sh
ln -s [email protected] ~/.local/share/gnome-shell/extensions
 CTRL+F2, and enter r to Restart the shell. then enable the extension.

modified extension.js and execute below shell 
./build.sh

CTRL+F2, and enter r to Restart the shell.