None of us at Sourcegraph write Haskell, but if you know of anybody who would be interested in helping us add it (on a contract basis), please let me know! sqs at sourcegraph.com
Same deal...we would love to add it but none of us use Clojure. Anyone who's interested in helping us add it (on a contract basis) should email me at sqs at sourcegraph.com. Or follow the issue at https://github.com/sourcegraph/sourcegraph.com/issues/154.
I'd love to see C# support. I suspect you could achieve this via Rosyln [0], but I don't think I'd be able to accomplish this myself. I'd be happy to chat about it, though.