private async createShellLaunchConfig()

in src/vs/workbench/contrib/tasks/browser/terminalTaskSystem.ts [769:893]
119 lines of code
45 McCabe index (conditional complexity)

	private async createShellLaunchConfig(task: CustomTask | ContributedTask, workspaceFolder: IWorkspaceFolder, variableResolver: VariableResolver, platform: Platform.Platform, options: CommandOptions, command: CommandString, args: CommandString[], waitOnExit: boolean | string): Promise<IShellLaunchConfig | undefined> {
		let shellLaunchConfig: IShellLaunchConfig;
		let isShellCommand = task.command.runtime === RuntimeType.Shell;
		let needsFolderQualification = this.contextService.getWorkbenchState() === WorkbenchState.WORKSPACE;
		let terminalName = this.createTerminalName(task, workspaceFolder);
		let originalCommand = task.command.name;
		if (isShellCommand) {
			const defaultConfig = await this.terminalInstanceService.getDefaultShellAndArgs(platform);
			shellLaunchConfig = { name: terminalName, executable: defaultConfig.shell, args: defaultConfig.args, waitOnExit };
			let shellSpecified: boolean = false;
			let shellOptions: ShellConfiguration | undefined = task.command.options && task.command.options.shell;
			if (shellOptions) {
				if (shellOptions.executable) {
					shellLaunchConfig.executable = this.resolveVariable(variableResolver, shellOptions.executable);
					shellSpecified = true;
				}
				if (shellOptions.args) {
					shellLaunchConfig.args = this.resolveVariables(variableResolver, shellOptions.args.slice());
				} else {
					shellLaunchConfig.args = [];
				}
			}
			let shellArgs = Array.isArray(shellLaunchConfig.args!) ? <string[]>shellLaunchConfig.args!.slice(0) : [shellLaunchConfig.args!];
			let toAdd: string[] = [];
			let commandLine = this.buildShellCommandLine(platform, shellLaunchConfig.executable!, shellOptions, command, originalCommand, args);
			let windowsShellArgs: boolean = false;
			if (platform === Platform.Platform.Windows) {
				windowsShellArgs = true;
				let basename = path.basename(shellLaunchConfig.executable!).toLowerCase();
				// If we don't have a cwd, then the terminal uses the home dir.
				const userHome = await this.getUserHome();
				if (basename === 'cmd.exe' && ((options.cwd && isUNC(options.cwd)) || (!options.cwd && isUNC(userHome.fsPath)))) {
					return undefined;
				}
				if ((basename === 'powershell.exe') || (basename === 'pwsh.exe')) {
					if (!shellSpecified) {
						toAdd.push('-Command');
					}
				} else if ((basename === 'bash.exe') || (basename === 'zsh.exe')) {
					windowsShellArgs = false;
					if (!shellSpecified) {
						toAdd.push('-c');
					}
				} else if (basename === 'wsl.exe') {
					if (!shellSpecified) {
						toAdd.push('-e');
					}
				} else {
					if (!shellSpecified) {
						toAdd.push('/d', '/c');
					}
				}
			} else {
				if (!shellSpecified) {
					// Under Mac remove -l to not start it as a login shell.
					if (platform === Platform.Platform.Mac) {
						let index = shellArgs.indexOf('-l');
						if (index !== -1) {
							shellArgs.splice(index, 1);
						}
					}
					toAdd.push('-c');
				}
			}
			toAdd.forEach(element => {
				if (!shellArgs.some(arg => arg.toLowerCase() === element)) {
					shellArgs.push(element);
				}
			});
			shellArgs.push(commandLine);
			shellLaunchConfig.args = windowsShellArgs ? shellArgs.join(' ') : shellArgs;
			if (task.command.presentation && task.command.presentation.echo) {
				if (needsFolderQualification) {
					shellLaunchConfig.initialText = `\x1b[1m> Executing task in folder ${workspaceFolder.name}: ${commandLine} <\x1b[0m\n`;
				} else {
					shellLaunchConfig.initialText = `\x1b[1m> Executing task: ${commandLine} <\x1b[0m\n`;
				}
			}
		} else {
			let commandExecutable = ((task.command.runtime !== RuntimeType.CustomExecution) && (task.command.runtime !== RuntimeType.CustomExecution2)) ? CommandString.value(command) : undefined;
			let executable = !isShellCommand
				? this.resolveVariable(variableResolver, '${' + TerminalTaskSystem.ProcessVarName + '}')
				: commandExecutable;

			// When we have a process task there is no need to quote arguments. So we go ahead and take the string value.
			shellLaunchConfig = {
				name: terminalName,
				executable: executable,
				args: args.map(a => Types.isString(a) ? a : a.value),
				waitOnExit
			};
			if (task.command.presentation && task.command.presentation.echo) {
				let getArgsToEcho = (args: string | string[] | undefined): string => {
					if (!args || args.length === 0) {
						return '';
					}
					if (Types.isString(args)) {
						return args;
					}
					return args.join(' ');
				};
				if (needsFolderQualification) {
					shellLaunchConfig.initialText = `\x1b[1m> Executing task in folder ${workspaceFolder.name}: ${shellLaunchConfig.executable} ${getArgsToEcho(shellLaunchConfig.args)} <\x1b[0m\n`;
				} else {
					shellLaunchConfig.initialText = `\x1b[1m> Executing task: ${shellLaunchConfig.executable} ${getArgsToEcho(shellLaunchConfig.args)} <\x1b[0m\n`;
				}
			}
		}

		if (options.cwd) {
			let cwd = options.cwd;
			if (!path.isAbsolute(cwd)) {
				let workspaceFolder = task.getWorkspaceFolder();
				if (workspaceFolder && (workspaceFolder.uri.scheme === 'file')) {
					cwd = path.join(workspaceFolder.uri.fsPath, cwd);
				}
			}
			// This must be normalized to the OS
			shellLaunchConfig.cwd = resources.toLocalResource(URI.from({ scheme: Schemas.file, path: cwd }), this.environmentService.configuration.remoteAuthority);
		}
		if (options.env) {
			shellLaunchConfig.env = options.env;
		}
		return shellLaunchConfig;
	}