Build shortcut to submit screenshot to carbon.now.sh, see https://gist.github.com/pirate/22438209f9ce5a7ece1813dac9014228 for submit-carbon-sh.js

carbon.sh.sublime-project.json

{
    ...,
    "build_systems":
    [
        {
            ...,
            "variants":
            [
                ...,
                {
                    "cmd":
                    [
                        "open $(~/proj/submit-carbon-sh.js < \"$file\")"
                    ],
                    "name": "Tweet carbon.now.sh screenshot",
                    "shell": true
                },
            ]
        }
    ]
}