A Twitter to Mastodon copy bot written in Rust

It:
* copies the content (text) of the original Tweet
* dereferences the links
* gets every attach media (photo, video or gif)

If any of the last steps failed, the Toot gets published with the exact same text as the Tweet.

# Usage

First up, create a configuration file (default path is `/usr/local/etc/scootaloo.toml`). It will look like this:

```
[scootaloo]

last_tweet_path="/usr/local/etc/last_tweet" ## file containing the last tweet id received, must be writable
cache_path="/tmp/scootaloo" ## a dir where the temporary files will be download, must be writeable

[twitter]
username="NintendojoFR" ## User Timeline to copy

## Consumer/Access key for Twitter (can be generated at https://developer.twitter.com/en/apps)
consumer_key="MYCONSUMERKEY"
consumer_secret="MYCONSUMERSECRET"
access_key="MYACCESSKEY"
access_secret="MYACCESSSECRET"
```

Then run the command with the `register` subcommand:
```
scootaloo register --host https://m.nintendojo.fr
```

This will give you the end of the TOML file. It will look like this:

```
[mastodon]
base = "https://m.nintendojo.fr"
client_id = "MYCLIENTID"
client_secret = "MYCLIENTSECRET"
redirect = "urn:ietf:wg:oauth:2.0:oob"
token = "MYTOKEN"
```

You can then run the application via `cron` for example. Here is the generic usage:

```
USAGE:
    scootaloo [OPTIONS] [SUBCOMMAND]

FLAGS:
    -h, --help       Prints help information
    -V, --version    Prints version information

OPTIONS:
    -c, --config <CONFIG_FILE>    TOML config file for scootaloo (default /usr/local/etc/scootaloo.toml)

SUBCOMMANDS:
    help        Prints this message or the help of the given subcommand(s)
    register    Command to register to a Mastodon Instance
```

# Quirks

Scootaloo does not respect the spam limits imposed by Mastodon: it will make a 429 error if too much Tweets are converted to Toots in a short amount of time (and it will not recover from it). By default, it gets the last 200 tweets from the user timeline (which is a lot!). It is recommended to put a Tweet number into the `last_tweet` file before copying an old account.

Oh and everything is sync (and not async) so this does not run at a blazing speed…