Allow creating installs using only command line options (#51)

When no interactive session is available `inquirer` doesn't work, e.g.
in Dockerfiles or automated scripts.
In theses cases you can use the command line options that are added with
this PR.

E.g. install a dev install:
```shell
nodecg-io install --nodecg-io-version development --samples
```

Or create a production install using a specific list of servies:
```shell
nodecg-io install --nodecg-io-version 0.1 --service twitch-chat
--service discord
```

Create a production install with all available services installed:
```shell
nodecg-io install --nodecg-io-version 0.2 --all-services
```

Author: hlxid

src/index.ts

@@ -16,11 +16,15 @@ const args = yargs(process.argv.slice(2))
     .command(generateModule)
     .option("disable-updates", { type: "boolean", description: "Disables check for nodecg-io-cli updates" })
     .strict()
-    .demandCommand();
+    .demandCommand()
+    .parserConfiguration({
+        "dot-notation": false,
+    })
+    .parse();
 
 ensureNode12();
 (async () => {
-    const opts = await args.argv;
+    const opts = await args;
     if (!opts["disable-updates"]) {
         checkForCliUpdate();
     }

src/install/index.ts

@@ -10,20 +10,58 @@ import { logger } from "../utils/log";
 import { requireNpmV7 } from "../utils/npm";
 import { findNodeCGDirectory, getNodeCGIODirectory } from "../utils/nodecgInstallation";
 
-export const installModule: CommandModule<unknown, { concurrency: number }> = {
+export interface InstallCommandOptions {
+    "nodecg-io-version"?: string;
+    service: Array<string | number>;
+    "all-services": boolean;
+    docs: boolean;
+    samples: boolean;
+}
+
+export const installModule: CommandModule<unknown, InstallCommandOptions> = {
     command: "install",
     describe: "installs nodecg-io to your local nodecg installation",
-    handler: async () => {
+    handler: async (opts) => {
         try {
-            await install();
+            await install(opts);
         } catch (err) {
             logger.error(`Error while installing nodecg-io: ${err}`);
             process.exit(1);
         }
     },
+    builder: (yargs) =>
+        yargs
+            .option("nodecg-io-version", {
+                type: "string",
+                description:
+                    'The version of nodecg-io to install. Either "major.minor" for production or "development"',
+            })
+            .option("service", {
+                type: "array",
+                description:
+                    "The modecg-io services to install alongside the needed components. Only affects production installs.",
+                default: [],
+            })
+            .option("all-services", {
+                type: "boolean",
+                description: "Whether to install all available services. Only affects production installs.",
+                default: false,
+            })
+            .option("docs", {
+                type: "boolean",
+                description:
+                    "Whether to clone the docs repo into the /docs sub directory. Only available for development installs.",
+                default: true,
+            })
+            .option("samples", {
+                type: "boolean",
+                description:
+                    "Whether to add the samples to your NodeCG configuration. Only available for development installs.",
+                default: false,
+            }),
 };
 
-async function install(): Promise<void> {
+async function install(opts: InstallCommandOptions): Promise<void> {
     await requireNpmV7();
 
     logger.info("Installing nodecg-io...");
@@ -33,7 +71,7 @@ async function install(): Promise<void> {
     const nodecgIODir = getNodeCGIODirectory(nodecgDir);
 
     let currentInstall = await readInstallInfo(nodecgIODir);
-    const requestedInstall = await promptForInstallInfo(currentInstall);
+    const requestedInstall = await promptForInstallInfo(currentInstall, opts);
 
     // If the minor version changed and we already have another one installed, we need to delete it, so it can be properly installed.
     if (currentInstall && currentInstall.version !== requestedInstall.version && (await directoryExists(nodecgIODir))) {

src/install/prompt.ts

@@ -12,6 +12,7 @@ import {
     getServicesForVersion,
     supportedNodeCGIORange,
 } from "../nodecgIOVersions";
+import { InstallCommandOptions } from ".";
 
 interface PromptInput {
     version: string;
@@ -27,8 +28,26 @@ interface PromptInput {
  * @param currentInstall the current install that will be used for default values
  * @returns the requested installation
  */
-export async function promptForInstallInfo(currentInstall: Installation | undefined): Promise<Installation> {
+export async function promptForInstallInfo(
+    currentInstall: Installation | undefined,
+    opts: InstallCommandOptions,
+): Promise<Installation> {
     const versions = await getCompatibleVersions();
+    const optsVersion = opts["nodecg-io-version"];
+    if (optsVersion) {
+        if (optsVersion !== developmentVersion && !versions.includes(optsVersion)) {
+            throw new Error(`The specified nodecg-io "${optsVersion}" version could not be found.`);
+        }
+
+        return await processPromptInput({
+            version: optsVersion,
+            useSamples: opts.samples,
+            cloneDocs: opts.docs,
+            services: opts["all-services"]
+                ? getServicesForVersion(optsVersion)
+                : opts.service?.map((s) => s.toString()),
+        });
+    }
 
     const currentProd = currentInstall !== undefined && !currentInstall.dev ? currentInstall : undefined;
     const currentDev = currentInstall !== undefined && currentInstall.dev ? currentInstall : undefined;