private ensureGoCodeConfigured()

in src/language/legacy/goSuggest.ts [494:571]
71 lines of code
15 McCabe index (conditional complexity)

	private ensureGoCodeConfigured(fileuri: vscode.Uri, goConfig: vscode.WorkspaceConfiguration): Thenable<void> {
		const currentFile = fileuri.fsPath;
		let checkModSupport = Promise.resolve(this.isGoMod);
		if (this.previousFile !== currentFile && this.previousFileDir !== path.dirname(currentFile)) {
			this.previousFile = currentFile;
			this.previousFileDir = path.dirname(currentFile);
			checkModSupport = isModSupported(fileuri).then((result) => (this.isGoMod = result));
		}
		const setPkgsList = getImportablePackages(currentFile, true).then((pkgMap) => {
			this.pkgsList = pkgMap;
		});

		if (!this.setGocodeOptions) {
			return Promise.all([checkModSupport, setPkgsList]).then(() => {
				return;
			});
		}

		const setGocodeProps = new Promise<void>((resolve) => {
			const gocode = getBinPath('gocode');
			const env = toolExecutionEnvironment();

			cp.execFile(gocode, ['set'], { env }, (err, stdout) => {
				if (err && stdout.startsWith('gocode: unknown subcommand:')) {
					if (
						goConfig['gocodePackageLookupMode'] === 'gb' &&
						this.globalState &&
						!this.globalState.get(gocodeNoSupportForgbMsgKey)
					) {
						vscode.window
							.showInformationMessage(
								'The go.gocodePackageLookupMode setting for gb will not be honored as github.com/mdempskey/gocode doesnt support it yet.',
								"Don't show again"
							)
							.then((selected) => {
								if (selected === "Don't show again") {
									this.globalState?.update(gocodeNoSupportForgbMsgKey, true);
								}
							});
					}
					this.setGocodeOptions = false;
					return resolve();
				}

				const existingOptions = stdout.split(/\r\n|\n/);
				const optionsToSet: string[][] = [];
				const setOption = () => {
					const [name, value] = optionsToSet.pop() ?? [];
					cp.execFile(gocode, ['set', name, value], { env }, () => {
						if (optionsToSet.length) {
							setOption();
						} else {
							resolve();
						}
					});
				};

				if (existingOptions.indexOf('propose-builtins true') === -1) {
					optionsToSet.push(['propose-builtins', 'true']);
				}
				if (existingOptions.indexOf(`autobuild ${goConfig['gocodeAutoBuild']}`) === -1) {
					optionsToSet.push(['autobuild', goConfig['gocodeAutoBuild']]);
				}
				if (existingOptions.indexOf(`package-lookup-mode ${goConfig['gocodePackageLookupMode']}`) === -1) {
					optionsToSet.push(['package-lookup-mode', goConfig['gocodePackageLookupMode']]);
				}
				if (!optionsToSet.length) {
					return resolve();
				}

				setOption();
			});
		});

		return Promise.all([setPkgsList, setGocodeProps, checkModSupport]).then(() => {
			return;
		});
	}