Added controller action generator for create, new, edit, update, delete

[dangerzone]

Addresses issue #55 since #75 has become stale.

In addition to the changes made by @fergloragain, this PR fixes some errors present in that PR and adds views for edit and new actions. It also makes the action creation error more helpful.

The views aren't terribly pretty though since I'm not one with the CSS.

[CLAassistant]

All committers have signed the CLA.

[matthewmueller]

Thanks so much for for working on #75 @dangerzone!

I pulled it down and tried:

bud new controller posts new show index create delete update edit

But ran into this concurrency error:

fatal error: concurrent map iteration and map write

The problem is the vfs.Memory in the scaffolder isn't concurrency-safe:

bud/internal/scaffold/scaffold.go

Lines 78 to 79 in de066c6

	eg.Go(func() error { return s.Scaffold(fsys) })
	}

I was thinking about swapping that out for https://github.com/psanford/memfs, but it'd also need to implement the RemoveAll function. Maybe a fork? We could also keep it simpler and just wrap the functions in mutexes. Adjusting the internal vfs.Memory API will be necessary.

Feel free to take a stab at fixing this, otherwise I'll get that fixed over the weekend.

[matthewmueller]

Remove fmt

[dangerzone]

If we wrap it in a mutex, that'd defeat the purpose of having it be in a goroutine. For now, I say we run the scaffolding sequentially instead of concurrently. This isn't exactly a performance critical hot-path anyway and there are lower hanging fruit for us to occupy our time with ;)

[dangerzone]

I removed the concurrent calls and it works as expected

[matthewmueller]

Thanks for your effort on this one @dangerzone! I ended up creating a new PR because there were quite a few changes I wanted to make and tests to add.

I based a lot of the initial work on this PR, so I really appreciate your help with that and also giving me the extra oomf to wrap this up!