[callhierarchy] added call hierarchy for Go

[JanKoehnlein]

Signed-off-by: Jan Koehnlein jan.koehnlein@typefox.io

[JanKoehnlein]

Available in the context menu over a function or function call.
Please test whether it makes sense this way.

[simark]

If I understand correctly, the call hierarchy UI is not really decided by this extension, it's done by some other Theia extension or the core? So what this extension does is simply state that the Go language supports call hierarchies?

I used this code for testing: https://github.com/simark/ls-interact/tree/master/go-test

When I try on the plus and plusPlus functions, it works. When I try on the Times function (which is defined in other.go), I get:

Error running guru: Command failed: /home/emaisin/gopath/bin/guru -modified referrers /home/emaisin/src/ls-interact/go-test/other.go:#19
guru: query object not found during reloading

in an error popup.

And when trying on Println:

Command failed: /home/emaisin/gopath/bin/godef -t -i -f /home/emaisin/src/ls-interact/go-test/test.go -o 830
godef: no declaration found for fmt.Println

[JanKoehnlein]

@simark Yes, the callhierarchy is implemented in @theia/callhierarchy. We just state here that we support it.

The problem you describe comes from a missconfigured GOPATH variable. The command line tools the go LS delegates to needs GOPATH to be defined correctly to find references across files. By default, it assumes GOPATH=~/go. So this is not a callhierarchy issue, but a general one.

I've created #12 to discuss this.

A workaround here is to put

{
    "inferGopath": true
}

in the go.json in the root of your workspace.

[simark]

2018?

[simark]

There is some indentation issue here.