* SNCF Bot

** Usage

Get an access to the [[https://www.digital.sncf.com/startup/api][SNCF API]]. By creating an account, you should
receive an email with your authentication key.

The program reads the authentication key from the =SNCF_AUTH_KEY=
environment variable.

#+begin_src sh
$ export SNCF_AUTH_KEY=<sncf-key>
$ sncf
┌────────────┬────────────────────────────────┬───────────────┐
│ Réseau     │ Direction                      │ Heure         │
├────────────┼────────────────────────────────┼───────────────┤
│ TRANSILIEN │ Paris Saint-Lazare (Paris)     │ 08:41         │
│ TER        │ Paris Saint-Lazare (Paris)     │ 08:54         │
│ TER        │ Rouen Rive Droite (Rouen)      │ 09:07         │
│ TRANSILIEN │ Paris Saint-Lazare (Paris)     │ 09:41         │
│ TER        │ Paris Saint-Lazare (Paris)     │ 09:55         │
│ TER        │ Paris Saint-Lazare (Paris)     │ 10:58         │
│ TER        │ Rouen Rive Droite (Rouen)      │ 11:05         │
│ TRANSILIEN │ Paris Saint-Lazare (Paris)     │ 11:37         │
│ TER        │ Paris Saint-Lazare (Paris)     │ 12:56         │
│ TER        │ Rouen Rive Droite (Rouen)      │ 13:06         │
└────────────┴────────────────────────────────┴───────────────┘
#+end_src

If you want to publish to [[https://mattermost.com/][Mattermost]], create an [[https://developers.mattermost.com/integrate/webhooks/incoming/][incoming webhook]] by
going to *Product menu* (top left) → *Integrations* → *Incoming
webhooks*.

Use the ~--mattermost-url~ option to set the webhook URL and post to
Mattermost. Optionally, you can override the default channel of the
webhook with ~--channel~.

** Building instructions

The build script will use Docker to build a fully static executable.
The Dockerfile is based on the [[https://hub.docker.com/r/gerbil/alpine][gerbil/alpine]] image.

#+begin_src sh
$ ./build.sh
#+end_src