Add support for go coverage tool

[m0sth8]

Go 1.2 has new "go tool cover" program.

http://golang.org/doc/go1.2#cover

[dlsniper]

Yeap, I know about it. Right now you can run the tests with '-cover' argument and it should produce the output but I don't know how to make it so that we have more idea-like coverage display :(

[m0sth8]

I'll try to figure out how to implement this at the weekend.

[dlsniper]

From what I've seen in my usage so far, it can only be done by parsing the resulting html, which should be fun :D
I wonder if it would make sense to make a contribution to the go tools to have this outputing something more machine-readable, maybe a json or something.

[m0sth8]

go test -coverprofile=c.out output is like:

mode: set
skimmer/api.go:18.39,29.66 6 0
skimmer/api.go:39.2,39.65 1 0
skimmer/api.go:47.2,47.92 1 0
skimmer/api.go:55.2,55.64 1 0
skimmer/api.go:64.2,64.12 1 0
skimmer/api.go:29.66,31.49 2 0
skimmer/api.go:31.49,34.5 2 0

format is described here: https://code.google.com/p/go/source/browse/cover/profile.go?repo=tools#54

[dlsniper]

Ah, cool, didn't knew about that. Have fun then ;)

[m0sth8]

Could you recommend smth to read about Idea coverage implementation?

[dlsniper]

You could try to see how it's implemented here: https://github.com/JetBrains/intellij-plugins/tree/master/js-karma/src/com/intellij/javascript/karma/coverage

And I guess ask some questions here: http://devnet.jetbrains.com/community/idea/open_api_and_plugin_development They are usually fast to address questions and are very nice.

[m0sth8]

Thank you.

[dlsniper]

Also maybe this one: https://github.com/JetBrains/intellij-plugins/tree/master/JsTestDriver/src/com/google/jstestdriver/idea/coverage

I'm not sure if other plugins have this implemented or not, for some of the things I've changed / implemented I was looking at the Haskell and Dart but I haven't checked if they support coverage for tests.