/*

* Filename: arg-parse.ts

* Author: simshadows <[email protected]>

* License: GNU Affero General Public License v3 (AGPL-3.0)

*/

import path from "path";

import {Command} from "commander";

// The commander package seems poorly typed, so I'll need to make explicit checks.

// TODO: Drill into the typing issues later.

function ensureStr(obj: any, argName: string): string {

if (typeof obj === "string") return obj;

throw new Error(`'${argName}' argument is not a string.`);

}

/********************************************************************/

export interface ArgValues {

specFilePath: string;

sourceOutputDirPath: string;

appOutputDirPath: string;

allowOverwriteOutput: boolean;

startDevServer: boolean;

}

const program = new Command();

program.name("solves");

const cwd = process.cwd();

program.requiredOption(

"-s, --spec <path>",

"Specification file input.",

);

program.option(

"--source-out <path>",

"Output directory for the generated source code.",

"../../generated-source", // TODO: How to make this relative to invocation?

);

program.option(

"-o, --app-out <path>",

"Output directory for the generated static web app.",

"../../generated-web-app", // TODO: How to make this relative to invocation?

);

program.option(

"-f, --force",

"Allows overwriting of output directories (--source-out and --app-out).",

);

program.option(

"--start-dev-server",

"Instead of emitting a generated static web app (via. -o/--app-out), start the Webpack dev server. Using --start-dev-server will cause -o/--app-out to be ignored.",

);

program.parse();

const rawOptions = program.opts();

const typedOptions: ArgValues = {

specFilePath: path.join(cwd, ensureStr(rawOptions["spec"], "spec")),

sourceOutputDirPath: path.join(cwd, ensureStr(rawOptions["sourceOut"], "source-out")),

appOutputDirPath: path.join(cwd, ensureStr(rawOptions["appOut"], "app-out")),

allowOverwriteOutput: (rawOptions["force"] === true),

startDevServer: (rawOptions["startDevServer"] === true),

};

// Some really crude validation for this prototype, for safety

if (typedOptions.sourceOutputDirPath === "") throw "can't be empty";

if (typedOptions.appOutputDirPath === "") throw "can't be empty";

export function getCLIArgs(): Readonly<ArgValues> {

return typedOptions;

}

console.info("Arguments:");

console.info(typedOptions);

console.info();