Create GitHub CLI extension for getignore

[tbjers]

So that PR came as a result of me investigating whether or not it would make sense to make a gh extension for auto-generating .gitignore files based on the existing repo. My Go skills aren't there, but maybe you could take a look at integration/implementation and I can contribute?

Just run gh extension create and it'll guide you through setting one up. I am not sure what the best way to integrate what you have in this repo, so maybe you could advise?

For further info, take a look at this extension base for Go:
https://github.com/cli/go-gh

And here's the documentation for creating pre-compiled Go extensions:
https://docs.github.com/en/github-cli/github-cli/creating-github-cli-extensions#creating-a-precompiled-extension-in-go-with-gh-extension-create

Originally posted by @gotgenes in #9 (comment)

[gotgenes]

@tbjers I was unaware there were extensions for gh, a tool I started using last year. I was unaware gh was written in Go, too. Thanks for bringing this idea!

getignore uses the REST API v3. That API actually has a friendly /gitignore endpoint. That's always going to use the github/gitignore repository and always on main branch.

I wanted getignore to have flexibility in case the user wants to retrieve patterns from a different repository, so it does not use the /gitignore endpoint. If you're using gh as a command, I believe it's worth assuming you want the latest patterns from github/gitignore on main, so this flexibility might seem too roundabout since it'd be easier to just use the /gitignore endpoint.

Also, I looked at gh and it seems it uses the GraphQL API v4. I'm having trouble navigating that API to see if it exposes a similar gitignore resource. If it does, it might be more straightforward to take advantage of that.

Curious to hear more of your thoughts!

[tbjers]

@gotgenes I don't think GraphQL has any way to fetch gitignore templates. I think we'd still use the REST API. I like the idea of doing a gh extension though, I think a lot of people would use it if it was available.