export async function setSelectedGo()

in src/goEnvironmentStatus.ts [134:205]
64 lines of code
20 McCabe index (conditional complexity)

export async function setSelectedGo(goOption: vscode.QuickPickItem, promptReload = true): Promise<boolean> {
	if (!goOption) {
		return false;
	}

	// if the selected go version is not installed, install it
	if (goOption instanceof GoEnvironmentOption) {
		const o = goOption.available ? (goOption as GoEnvironmentOption) : await downloadGo(goOption);
		// check that the given binary is not already at the beginning of the PATH
		const go = await getGoVersion();
		if (!!go && (go.binaryPath === o.binpath || 'Go ' + go.format() === o.label)) {
			return false;
		}
		await updateWorkspaceState('selectedGo', o);
	} else if (goOption.label === CLEAR_SELECTION) {
		if (!getSelectedGo()) {
			return false; // do nothing.
		}
		await updateWorkspaceState('selectedGo', undefined);
	} else if (goOption.label === CHOOSE_FROM_FILE_BROWSER) {
		const currentGOROOT = getCurrentGoRoot();
		const defaultUri = currentGOROOT ? vscode.Uri.file(path.join(currentGOROOT, 'bin')) : undefined;

		const newGoUris = await vscode.window.showOpenDialog({
			canSelectFiles: true,
			canSelectFolders: false,
			canSelectMany: false,
			defaultUri
		});
		if (!newGoUris || newGoUris.length !== 1) {
			return false;
		}
		const newGoBin = fixDriveCasingInWindows(newGoUris[0].fsPath);
		const oldGoBin = fixDriveCasingInWindows(path.join(defaultUri?.fsPath ?? '', correctBinname('go')));

		if (newGoBin === oldGoBin) {
			return false;
		}
		if (!executableFileExists(newGoBin)) {
			vscode.window.showErrorMessage(`${newGoBin} is not an executable`);
			return false;
		}
		let newGo: GoVersion | undefined;
		try {
			newGo = await getGoVersion(newGoBin);
			await updateWorkspaceState('selectedGo', new GoEnvironmentOption(newGo.binaryPath, formatGoVersion(newGo)));
		} catch (e) {
			if (!newGo || !newGo.isValid()) {
				vscode.window.showErrorMessage(`failed to get "${newGoBin} version", invalid Go binary:\n${e}`);
				return false;
			}
		}
	}
	// prompt the user to reload the window.
	// promptReload defaults to true and should only be false for tests.
	if (promptReload) {
		const choice = await vscode.window.showWarningMessage(
			'Please reload the window to finish applying Go version changes.',
			{
				modal: true
			},
			'Reload Window'
		);
		if (choice === 'Reload Window') {
			await vscode.commands.executeCommand('workbench.action.reloadWindow');
		}
	}
	goEnvStatusbarItem.text = 'Go: reload required';
	goEnvStatusbarItem.command = 'workbench.action.reloadWindow';

	return true;
}