subtree(users/wpcarro): docking briefcase at '24f5a642' r/3226

git-subtree-dir: users/wpcarro
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git-subtree-split: 24f5a642af3aa1627bbff977f0a101907a02c69f
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+# 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.