Add diagram of typeclass hierarchy continue #822

[kailuowang]

Obviously this is just a start, we can improve it once we have a starting point.

[kailuowang]

diagram result

[codecov-io]

Current coverage is 91.68% (diff: 100%)

Merging #1416 into master will not change coverage

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[ghost]

Just in case it's been forgotten - @non's prior art:

http://plastic-idolatry.com/erik/cats-graph.png

http://plastic-idolatry.com/erik/cats-graph2.png

[kailuowang]

Didn't forget that but I like this one because it's text specified and thus easy to change.

[adelbertc]

👍

[travisbrown]

👍, this looks great. I don't know anything about Gravizo—I don't suppose it's practical to have this rendered locally during the build?

[kailuowang]

@travisbrown the image is generated on Gravizo server and displays in the viewer - in most cases, the browser. Merging with 2 thumbs up.

[travisbrown]

@kailuowang Right—I was just wondering if it would be possible to do without relying on a third-party (commercial) service, since it looks like the service is just running graphviz for you. I'm happy to see this merged as-is, though.

[kailuowang]

I see. Not familiar with it myself (I merely resurrect @rklaehn's PR). Upon some research there are quite a few tools that can render dot locally. For example, https://github.com/drdozer/graphviz-s/tree/102215679c7da01689d3e4aade5f38782dbdb142. It might take some work to integrate it with sbt (this lib is 2.11). I agree it's less optimal to rely on a 3rd party commercial service.