Use the newly added receiver output from gocode to get the correct do…

…cumentation (#2215)

See mdempsky/gocode@be056ad

Part of #2107

src/goDeclaration.ts

@@ -125,7 +125,9 @@ function definitionLocation_godef(input: GoDefinitionInput, token: vscode.Cancel
 				if (!input.includeDocs || godefImportDefinitionRegex.test(definitionInformation.declarationlines[0])) {
 					return resolve(definitionInformation);
 				}
-				runGodoc(pkgPath, input.word, token).then(doc => {
+				// TODO #2107 Once godef supports printing method receivers we should pass
+				// the receiver to runGodoc
+				runGodoc(pkgPath, '', input.word, token).then(doc => {
 					if (doc) {
 						definitionInformation.doc = doc;
 					}
@@ -307,4 +309,4 @@ interface GoGetDocOuput {
 interface GuruDefinitionOuput {
 	objpos: string;
 	desc: string;
-}
+}

src/goSuggest.ts

@@ -44,10 +44,12 @@ interface GoCodeSuggestion {
 	package?: string;
 	name: string;
 	type: string;
+	receiver?: string;
 }
 
 class ExtendedCompletionItem extends vscode.CompletionItem {
 	package?: string;
+	receiver?: string;
 	fileName: string;
 }
 
@@ -94,7 +96,7 @@ export class GoCompletionItemProvider implements vscode.CompletionItemProvider,
 			return;
 		}
 
-		return runGodoc(item.package || path.dirname(item.fileName), item.label, token).then(doc => {
+		return runGodoc(item.package || path.dirname(item.fileName), item.receiver, item.label, token).then(doc => {
 			item.documentation = new vscode.MarkdownString(doc);
 			return item;
 		}).catch(err => {
@@ -283,6 +285,7 @@ export class GoCompletionItemProvider implements vscode.CompletionItemProvider,
 							let item = new ExtendedCompletionItem(suggest.name);
 							item.kind = vscodeKindFromGoCodeClass(suggest.class, suggest.type);
 							item.package = suggest.package;
+							item.receiver = suggest.receiver;
 							item.fileName = document.fileName;
 							item.detail = suggest.type;
 							if (suggest.class === 'package') {

src/util.ts

@@ -892,7 +892,7 @@ export function cleanupTempDir() {
  * @param symbol Symbol for which docs need to be found
  * @param token Cancellation token
  */
-export function runGodoc(packagePath: string, symbol: string, token: vscode.CancellationToken) {
+export function runGodoc(packagePath: string, receiver: string, symbol: string, token: vscode.CancellationToken) {
 	if (!packagePath) {
 		return Promise.reject(new Error('Package Path not provided'));
 	}
@@ -908,6 +908,11 @@ export function runGodoc(packagePath: string, symbol: string, token: vscode.Canc
 	const getCurrentPackagePromise = path.isAbsolute(packagePath) ? getCurrentPackage(packagePath) : Promise.resolve(packagePath);
 	return getCurrentPackagePromise.then(packageImportPath => {
 		return new Promise<string>((resolve, reject) => {
+			if (receiver) {
+				receiver = receiver.replace(/^\*/, '');
+				symbol = receiver + '.' + symbol;
+			}
+
 			const env = getToolsEnvVars();
 			const args = ['doc', '-c', '-cmd', '-u', packageImportPath, symbol];
 			const p = cp.execFile(goRuntimePath, args, { env }, (err, stdout, stderr) => {