Close gocode daemon on deactivation (#2137)

* Close gocode daemon on deactivation

Note that the extension doesn't actually start the gocode daemon,
the gocode client itself does that as necessary.

It is safe to close the daemon for the same reason however.
If other clients were using the daemon, it will be restarted
on their next request.

Fixes #2132

* Fix linting error

* Close gocode only if its found

Author: zmb3

src/goMain.ts

@@ -563,5 +563,7 @@ function checkToolExists(tool: string) {
 }
 
 function registerCompletionProvider(ctx: vscode.ExtensionContext) {
-	ctx.subscriptions.push(vscode.languages.registerCompletionItemProvider(GO_MODE, new GoCompletionItemProvider(ctx.globalState), '.', '\"'));
+	let provider = new GoCompletionItemProvider(ctx.globalState);
+	ctx.subscriptions.push(provider);
+	ctx.subscriptions.push(vscode.languages.registerCompletionItemProvider(GO_MODE, provider, '.', '\"'));
 }

src/goSuggest.ts

@@ -55,8 +55,7 @@ const lineCommentRegex = /^\s*\/\/\s+/;
 const exportedMemberRegex = /(const|func|type|var)(\s+\(.*\))?\s+([A-Z]\w*)/;
 const gocodeNoSupportForgbMsgKey = 'dontshowNoSupportForgb';
 
-export class GoCompletionItemProvider implements vscode.CompletionItemProvider {
-
+export class GoCompletionItemProvider implements vscode.CompletionItemProvider, vscode.Disposable {
 	private pkgsList = new Map<string, string>();
 	private killMsgShown: boolean = false;
 	private setGocodeOptions: boolean = true;
@@ -209,6 +208,14 @@ export class GoCompletionItemProvider implements vscode.CompletionItemProvider {
 		});
 	}
 
+	public dispose() {
+		let gocodeName = this.isGoMod ? 'gocode-gomod' : 'gocode';
+		let gocode = getBinPath(gocodeName);
+		if (path.isAbsolute(gocode)) {
+			cp.spawn(gocode, ['close'], { env: getToolsEnvVars() });
+		}
+	}
+
 	private runGoCode(document: vscode.TextDocument, filename: string, inputText: string, offset: number, inString: boolean, position: vscode.Position, lineText: string, currentWord: string, includeUnimportedPkgs: boolean, config: vscode.WorkspaceConfiguration): Thenable<vscode.CompletionItem[]> {
 		return new Promise<vscode.CompletionItem[]>((resolve, reject) => {
 			let gocodeName = this.isGoMod ? 'gocode-gomod' : 'gocode';