limit indent size to 8

[Konfekt]

addresses #4

[timakro]

I think the intent was to fall back to user preferences or file-type defaults in the case of a unrealistically large indentation?

For example, given a file like this

curl https://example.com/ -H "Content-Type: application/json" \
                          -H "Accept: application/json"

you wouldn't want to set shiftwidth and and softtabstop to 8, right?

You probably had something more like de2fd6c in mind.

[Konfekt]

Yes, such an example. User preferences are fine as well. I was not sure whether you preferred a max value instead.
While at it, I noticed that some computation are only needed in special cases and moved them inside if clauses

[timakro]

I don't mean to make the maximum indentation value configurable, sorry for the confusion. I think 8 is good. I was trying to say that your PR would change shiftwidth and softtabstop given my example file while the intent as I understand it is to not change those settings in this scenario.

[Konfekt]

Yes, counting only up to 8 is a better solution, thank you.
I adapted this PR accordingly, if there's still interest.

Edit: indent is computed relative to the last indent