# url-blocker `url-blocker` blocks the URLs that you want to block when you want it to block them. Let's say that you don't want to visit Twitter during the work week. Create the file `~/.config/url-blocker/rules.json` with the following contents and `url-blocker` will take care of the rest. ```json # ~/.config/url-blocker/rules.json [ { "urls": [ "twitter.com", "www.twitter.com", ], "allowed": [ { "day": "Saturday", "timeslots": [ "00:00-11:59" ] }, { "day": "Sunday", "timeslots": [ "00:00-11:59" ] } ] } ] ``` ## Installation ```shell $ nix-env -iA 'briefcase.tools.url-blocker' ``` ## How does it work? `systemd` is intended to run `url-blocker` once every minute. `url-blocker` will read `/etc/hosts` and map the URLs defined in `rules.json` to `127.0.0.1` when you want them blocked. Because `systemd` run once every minute, `/etc/hosts` should be current to the minute as well.