Include syntax highlighting in vscode extension about nickel HOT 5 CLOSED

Thanks @szlend, we're going to take a look, maybe re-use what you did as a base. I dream that one day we will only write one grammar specification, and derive a parser, various highlighters and plugins for editors, whatever is needed for a formatter, etc. but that day hasn't come yet 😞

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I'm not a VSCode user, so I don't know much about extension development, but that would be great if we could just piggy-back on tree-sitter, as we maintain a fairly up-to-date grammar already. It's hard to keep the number down (Vim, the Nickel parser, Prism.js for highlighting on the website, etc.), but the less grammars we have to maintain, the better 🙂

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There's no vscode tree-sitter support yet, but they're discussing it. Until then I quickly hacked together a more complete and up to date vscode package:

https://marketplace.visualstudio.com/items?itemName=szlend.unofficial-vscode-nickel

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Done in PR #1405

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Syntax highlighting has been added and the extension is now available on the VSCode Market Place: https://marketplace.visualstudio.com/items?itemName=Tweag.vscode-nickel

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