Esy: Bring back esy add.

[jordwalke]

esy add was removed in the lastest esy releases (not intentionally). We should bring it back.
Good first task.

[andreypopp]

Actually it’s not that simple to do that properly — we want to add package
but preserve installed versions as much as possible.
On Thu, 2 Aug 2018 at 06:28, Jordan W [e-mail] wrote:

esy add was removed in the lastest esy releases (not intentionally). We
should bring it back.
Good first task.

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[andreypopp]

The first iteration could be simpler though — resolve the most recent version and it with caret ^ to package.json.

[zploskey]

It looks like the add command was removed in https://github.com/esy/esy/commit/114e77ed4c313fd2d68996e01ce709a2e0dd6483. Is the intention to re-implement the command in OCaml or to continue to use makeCommandDelegatingToJsImpl? Happy to give it a go either way.

[andreypopp]

@zploskey Yes! We should implement it in native code (esy-install.js is going away really soon). Ping me on Discord if you have any questions!