export async function promptForMissingTool()

in src/goInstallTools.ts [382:451]
60 lines of code
14 McCabe index (conditional complexity)

export async function promptForMissingTool(toolName: string) {
	const tool = getTool(toolName);
	if (!tool) {
		vscode.window.showWarningMessage(
			`${toolName} is not found. Please make sure it is installed and available in the PATH ${getEnvPath()}`
		);
		return;
	}

	// If user has declined to install this tool, don't prompt for it.
	if (declinedToolInstall(toolName)) {
		return;
	}

	const goVersion = await getGoVersion();
	if (!goVersion) {
		return;
	}

	// Show error messages for outdated tools or outdated Go versions.
	if (tool.minimumGoVersion && goVersion.lt(tool.minimumGoVersion.format())) {
		vscode.window.showInformationMessage(
			`You are using go${goVersion.format()}, but ${
				tool.name
			} requires at least go${tool.minimumGoVersion.format()}.`
		);
		return;
	}
	if (tool.maximumGoVersion && goVersion.gt(tool.maximumGoVersion.format())) {
		vscode.window.showInformationMessage(
			`You are using go${goVersion.format()}, but ${
				tool.name
			} only supports go${tool.maximumGoVersion.format()} and below.`
		);
		return;
	}

	const installOptions = ['Install'];
	let missing = await getMissingTools(goVersion);
	if (!containsTool(missing, tool)) {
		// If this function has been called, we want to display the prompt whether
		// it appears in missing or not.
		missing.push(tool);
	}
	missing = missing.filter((x) => x === tool || tool.isImportant);
	if (missing.length > 1) {
		// Offer the option to install all tools.
		installOptions.push('Install All');
	}
	const cmd = goVersion.lt('1.16')
		? `go get -v ${getImportPath(tool, goVersion)}`
		: `go install -v ${getImportPathWithVersion(tool, undefined, goVersion)}`;
	const selected = await vscode.window.showErrorMessage(
		`The "${tool.name}" command is not available. Run "${cmd}" to install.`,
		...installOptions
	);
	switch (selected) {
		case 'Install':
			await installTools([tool], goVersion);
			break;
		case 'Install All':
			await installTools(missing, goVersion);
			removeGoStatus(STATUS_BAR_ITEM_NAME);
			break;
		default:
			// The user has declined to install this tool.
			declinedInstalls.push(tool);
			break;
	}
}