public static async checkDockerState()

in src/common/utility.ts [682:743]
60 lines of code
20 McCabe index (conditional complexity)

    public static async checkDockerState(outputChannel: vscode.OutputChannel) {
        let state: DockerState;
        let errorMsg: any;
        try {
            await Executor.executeCMD(outputChannel, "docker", { shell: true }, "version");
            state = DockerState.Running;
        } catch (error) {
            errorMsg = error;
            const platform: string = os.platform();
            if (platform === "win32") {
                if (error.message.indexOf(Constants.commandNotFoundErrorMsgPatternOnWindows) > -1) {
                    state = DockerState.NotInstalled;
                } else if (error.message.indexOf(Constants.dockerNotRunningErrorMsgPatternOnWindows) > -1) {
                    state = DockerState.NotRunning;
                } else {
                    state = DockerState.Unknown;
                }
            } else if (platform === "linux" || platform === "darwin") {
                if (error.errorCode === 127 || error.message.indexOf(Constants.commandNotFoundErrorMsgPatternOnLinux) > -1 || error.message.match(/Command '.*?' not found/)) {
                    state = DockerState.NotInstalled;
                } else if (error.message.indexOf(Constants.dockerNotRunningErrorMsgPatternOnLinux) > -1) {
                    state = DockerState.NotRunning;
                } else if (Constants.permissionDeniedErrorMsgPatternOnLinux) {
                    state = DockerState.PermissionDenied;
                } else {
                    state = DockerState.Unknown;
                }
            } else {
                state = DockerState.Unknown;
            }
        }

        if (errorMsg) {
            const install: vscode.MessageItem = { title: Constants.InstallDocker };
            const troubleshooting: vscode.MessageItem = { title: Constants.TroubleShooting };
            const cancel: vscode.MessageItem = { title: Constants.Cancel };
            let input: vscode.MessageItem;
            let helpUrl: string;
            let items: vscode.MessageItem[];
            switch (state) {
                case DockerState.NotInstalled:
                    items = [install, cancel];
                    input = await vscode.window.showWarningMessage(Constants.dockerNotInstalledErrorMsg, ...items);
                    if (input === install) {
                        helpUrl = Constants.installDockerUrl;
                    }
                    break;
                case DockerState.NotRunning:
                case DockerState.Unknown:
                    items = [troubleshooting, cancel];
                    input = await vscode.window.showWarningMessage(Constants.dockerNotRunningErrorMsg, ...items);
                    if (input === troubleshooting) {
                        helpUrl = Constants.troubleShootingDockerUrl;
                    }
                    break;
            }

            if (input === troubleshooting || input === install) {
                await vscode.commands.executeCommand("vscode.open", vscode.Uri.parse(helpUrl));
            }
        }
    }