add papertrail-systems command to list systems

[samuelcolvin]

currently I'm using

papertrail-systems() {
    curl -s -H "X-Papertrail-Token: `cat ~/.papertrail.yml | sed -r 's/token://'`" https://papertrailapp.com/api/v1/systems.json | python -m json.tool | grep '"name":' | sed -r 's/ +"name": "(.*)",/\1/'
}

in my .bashrc file.

But it was a faff to setup, would be greate if there was a simpler way of getting this.

[bobpaul]

I agree it should be added. But here it is using jq to parse json and yj to convert yml to json (so it can be parsed with jq). While less portable, it's a tad more elegant then regex:

papertrail-systems() {                                                                              
    curl -s -H "X-Papertrail-Token: `cat ~/.papertrail.yml | yj | jq --raw-output .token`" https://papertrailapp.com/api/v1/systems.json | jq --raw-output .[].name
}