Goto Definition, Hover, Signature Help does not work for net package

[Aukstkalnis]

Windows 7 x86
VSCode 1.4.0
Go 0.6.43

When mouse is crossed on function than I should see function preview like this:

However, when I do this to net library functions I do see Loading.. for a blink of an eye and no preview is shown.

Also, ATL+F12 does not work on this library.

[lukehoban]

Could you provide a more complete example of the problem?

[Aukstkalnis]

Example Program:
package main

import "net"

func main() {
net.Listen("tcp","192.168.8.119:7000");
}

And when I write net.Listen(
I should see parameters that I should see like:

But with net library there is no list and when I cross with mouse on Listen word I see loading and it disappears in less then a second and I can not see definition of that function.

[jameshartig]

VSCode 1.6.1
Go 0.6.47

I'm having the same issue. It shows "Loading..." when hovering over net functions and won't let me Go To Definition on net functions. I turned on the developer console and don't see any errors or related messages in there.

[ramya-rao-a]

This is an issue with godef itself.

rogpeppe/godef#48

#599

[leaxoy]

May be we can use gogetdoc instead both godef and godoc.
Use gogetdoc -json option we have five properties of name, import, decl, doc, pos.
For example:
{"name":"Now","import":"time","decl":"func Now() Time","doc":"Now returns the current local time.\n","pos":"/usr/local/opt/go/libexec/src/time/time.go:777:6"}
Which give us pos for godef's work, and doc and decl for godoc's work.
So in some way, godef tool is useless.

[leaxoy]

export function definitionLocation(document: vscode.TextDocument, position: vscode.Position, includeDocs = true): Promise<GoDefinitionInformtation> {
    return new Promise<GoDefinitionInformtation>((resolve, reject) => {
        let wordAtPosition = document.getWordRangeAtPosition(position);
        let offset = byteOffsetAt(document, position);
        let gogetdoc = getBinPath('gogetdoc');
        let p = cp.execFile(gogetdoc, ['-json', '-pos=' + document.fileName + ':#' + offset.toString()], {}, (err, stdout, stderr) => {
            try {
                if (err && (<any>err).code === 'ENOENT') {
                    promptForMissingTool('gogetdoc');
                }
                if (err) return resolve(null);
                let goDocInfomation: GoDocInfomation = JSON.parse(stdout.toString());
                if (goDocInfomation.doc === 'A concurrent prime sieve\n') {
                    return resolve({
                        file: null,
                        line: 0,
                        column: 0,
                        signature: ['builtin keyword'],
                        doc: goDocInfomation.doc
                    });
                }
                let match = /(.*):(\d+):(\d+)/.exec(goDocInfomation.pos);
                if (!match) {
                    return resolve({
                        file: null,
                        line: 0,
                        column: 0,
                        signature: goDocInfomation.decl.split('\n'),
                        doc: goDocInfomation.doc
                    });
                }
                let [_, file, line, col] = match;
                return resolve({
                    file: file,
                    line: +line - 1,
                    column: +col - 1,
                    signature: goDocInfomation.decl.split('\n'),
                    doc: goDocInfomation.doc
                });
            } catch (e) {
                reject(e);
            }
        });
        p.stdin.end(document.getText());
    });
}

interface

interface GoDocInfomation {
    name: string;
    import: string;
    decl: string;
    doc: string;
    pos: string;
}

[ramya-rao-a]

In the latest update of the Go extension (0.6.50), we now support the use of gogetdoc for Goto/Peek Definition, Hover info and Signature Help features. Add "go.docsTool": "gogetdoc" to your setting to enable the use of gogetdoc, reload/restart VS Code and that should fix this issue.

[zgiber]

@ramya-rao-a Thank you for the fix, however simply performing the steps described in the comment does not solve the problem in my case. It makes all the Goto/Peek Definition, Hover info and Signature Help functions stop working. Perhaps there is something I've missed? Go Extension 0.6.50, VSCode Version 1.7.2 (1.7.2).

[ramya-rao-a]

@zgiber What version of Go are you using? Can you share the output of go version ?
If you are using Go from source, then yes in Go extension 0.6.50, Goto/Peek Definition, Hover info and Signature Help features stopped working. The newest update 0.6.51 has the fix for it

[zgiber]

@ramya-rao-a I'm using go version go1.7.4 darwin/amd64, not from source, but from archive. The Go plugin is now version 0.6.51. After adding the line: "go.docsTool": "gogetdoc", to user settings and restarting VSCode, Goto/Peek definition, Hover info, Signature stopped working. Removing the line restored the usual functionalities, but then the original issue (no tooltip on net package's functions) remains.

[ramya-rao-a]

@zgiber Since what you are seeing is specific to gogetdoc, I opened a new issue to track it #679. Lets continue the discussion in that thread