Add new CLI parser package

packages/cli-parser/cli-builder.type.ts

@@ -4,5 +4,7 @@ export interface CliParameter {
 	positioned?: boolean;
 	// Whether the argument needs a value (requires positioned to be false)
 	needsValue?: boolean;
+	optional?: true;
 	type: "string" | "number" | "boolean" | "array";
+	description?: string;
 }

packages/cli-parser/index.ts

@@ -1,4 +1,5 @@
 import type { CliParameter } from "./cli-builder.type";
+import chalk from "chalk";
 
 export function startsWithArray(fullArray: any[], startArray: any[]) {
 	if (startArray.length > fullArray.length) {
@@ -9,6 +10,10 @@ export function startsWithArray(fullArray: any[], startArray: any[]) {
 		.every((value, index) => value === startArray[index]);
 }
 
+interface TreeType {
+	[key: string]: CliCommand | TreeType;
+}
+
 /**
  * Builder for a CLI
  * @param commands Array of commands to register
@@ -115,6 +120,53 @@ export class CliBuilder {
 
 		command.run(argsWithoutCategories);
 	}
+
+	/**
+	 * Recursively urns the commands into a tree where subcategories mark each sub-branch
+	 * @example
+	 * ```txt
+	 * user verify
+	 * user delete
+	 * user new admin
+	 * user new
+	 * ->
+	 * user
+	 *   verify
+	 *   delete
+	 *   new
+	 *     admin
+	 *     ""
+	 * ```
+	 */
+	getCommandTree(commands: CliCommand[]): TreeType {
+		const tree: TreeType = {};
+
+		for (const command of commands) {
+			let currentLevel = tree; // Start at the root
+
+			// Split the command into parts and iterate over them
+			for (const part of command.categories) {
+				// If this part doesn't exist in the current level of the tree, add it
+				// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+				if (!currentLevel[part]) {
+					// If this is the last part of the command, add the command itself
+					if (
+						part ===
+						command.categories[command.categories.length - 1]
+					) {
+						currentLevel[part] = command;
+						break;
+					}
+					currentLevel[part] = {};
+				}
+
+				// Move down to the next level of the tree
+				currentLevel = currentLevel[part] as TreeType;
+			}
+		}
+
+		return tree;
+	}
 }
 
 /**
@@ -125,9 +177,45 @@ export class CliCommand {
 	constructor(
 		public categories: string[],
 		public argTypes: CliParameter[],
-		private execute: (args: Record<string, any>) => void
+		private execute: (args: Record<string, any>) => void,
+		public description?: string,
+		public example?: string
 	) {}
 
+	/**
+	 * Display help message for the command
+	 * formatted with Chalk and with emojis
+	 */
+	displayHelp() {
+		const positionedArgs = this.argTypes.filter(arg => arg.positioned);
+		const unpositionedArgs = this.argTypes.filter(arg => !arg.positioned);
+		const helpMessage = `
+${chalk.green("📚 Command:")} ${chalk.yellow(this.categories.join(" "))}
+${this.description ? `${chalk.cyan(this.description)}\n` : ""}
+${chalk.magenta("🔧 Arguments:")}
+${unpositionedArgs
+	.map(
+		arg =>
+			`${chalk.bold(arg.name)}: ${chalk.blue(arg.description ?? "(no description)")} ${
+				arg.optional ? chalk.gray("(optional)") : ""
+			}`
+	)
+	.join("\n")}
+${positionedArgs
+	.map(
+		arg =>
+			`--${chalk.bold(arg.name)}: ${chalk.blue(arg.description ?? "(no description)")} ${
+				arg.optional ? chalk.gray("(optional)") : ""
+			}`
+	)
+	.join(
+		"\n"
+	)}${this.example ? `\n${chalk.magenta("🚀 Example:")}\n${chalk.bgGray(this.example)}` : ""}
+`;
+
+		console.log(helpMessage);
+	}
+
 	/**
 	 * Parses string array arguments into a full JavaScript object
 	 * @param argsWithoutCategories
@@ -201,3 +289,35 @@ export class CliCommand {
 		this.execute(args);
 	}
 }
+
+const cliBuilder = new CliBuilder();
+
+const cliCommand = new CliCommand(
+	["category1", "category2"],
+	[
+		{
+			name: "name",
+			type: "string",
+			needsValue: true,
+			description: "Name of new item",
+		},
+		{
+			name: "delete-previous",
+			type: "number",
+			needsValue: false,
+			positioned: true,
+			optional: true,
+			description: "Also delete the previous item",
+		},
+		{ name: "arg3", type: "boolean", needsValue: false },
+		{ name: "arg4", type: "array", needsValue: true },
+	],
+	() => {
+		// Do nothing
+	},
+	"I love sussy sauces",
+	"emoji add --url https://site.com/image.png"
+);
+
+cliBuilder.registerCommand(cliCommand);
+//cliBuilder.displayHelp();

packages/cli-parser/package.json

@@ -1,6 +1,6 @@
 {
-    "name": "arg-parser",
-    "version": "0.0.0",
-    "main": "index.ts",
-    "dependencies": {}
+  "name": "arg-parser",
+  "version": "0.0.0",
+  "main": "index.ts",
+  "dependencies": { "strip-ansi": "^7.1.0" }
 }

packages/cli-parser/tests/cli-builder.test.ts

@@ -1,6 +1,7 @@
 // FILEPATH: /home/jessew/Dev/lysand/packages/cli-parser/index.test.ts
 import { CliCommand, CliBuilder, startsWithArray } from "..";
-import { describe, beforeEach, it, expect, jest } from "bun:test";
+import { describe, beforeEach, it, expect, jest, spyOn } from "bun:test";
+import stripAnsi from "strip-ansi";
 
 describe("startsWithArray", () => {
 	it("should return true when fullArray starts with startArray", () => {
@@ -141,6 +142,70 @@ describe("CliCommand", () => {
 			arg5: "value5",
 		});
 	});
+
+	it("should display help message correctly", () => {
+		const consoleLogSpy = spyOn(console, "log").mockImplementation(() => {
+			// Do nothing
+		});
+
+		cliCommand = new CliCommand(
+			["category1", "category2"],
+			[
+				{
+					name: "arg1",
+					type: "string",
+					needsValue: true,
+					description: "Argument 1",
+					optional: true,
+				},
+				{
+					name: "arg2",
+					type: "number",
+					needsValue: true,
+					description: "Argument 2",
+				},
+				{
+					name: "arg3",
+					type: "boolean",
+					needsValue: false,
+					description: "Argument 3",
+					optional: true,
+					positioned: true,
+				},
+				{
+					name: "arg4",
+					type: "array",
+					needsValue: true,
+					description: "Argument 4",
+					positioned: true,
+				},
+			],
+			() => {
+				// Do nothing
+			},
+			"This is a test command",
+			"category1 category2 --arg1 value1 --arg2 42 arg3 --arg4 value1,value2"
+		);
+
+		cliCommand.displayHelp();
+
+		const loggedString = consoleLogSpy.mock.calls.map(call =>
+			stripAnsi(call[0])
+		)[0];
+
+		consoleLogSpy.mockRestore();
+
+		expect(loggedString).toContain("📚 Command: category1 category2");
+		expect(loggedString).toContain("🔧 Arguments:");
+		expect(loggedString).toContain("arg1: Argument 1 (optional)");
+		expect(loggedString).toContain("arg2: Argument 2");
+		expect(loggedString).toContain("--arg3: Argument 3 (optional)");
+		expect(loggedString).toContain("--arg4: Argument 4");
+		expect(loggedString).toContain("🚀 Example:");
+		expect(loggedString).toContain(
+			"category1 category2 --arg1 value1 --arg2 42 arg3 --arg4 value1,value2"
+		);
+	});
 });
 
 describe("CliBuilder", () => {
@@ -214,4 +279,64 @@ describe("CliBuilder", () => {
 			arg1: "value1",
 		});
 	});
+
+	describe("should build command tree", () => {
+		let cliBuilder: CliBuilder;
+		let mockCommand1: CliCommand;
+		let mockCommand2: CliCommand;
+		let mockCommand3: CliCommand;
+		let mockCommand4: CliCommand;
+		let mockCommand5: CliCommand;
+
+		beforeEach(() => {
+			mockCommand1 = new CliCommand(["user", "verify"], [], jest.fn());
+			mockCommand2 = new CliCommand(["user", "delete"], [], jest.fn());
+			mockCommand3 = new CliCommand(
+				["user", "new", "admin"],
+				[],
+				jest.fn()
+			);
+			mockCommand4 = new CliCommand(["user", "new"], [], jest.fn());
+			mockCommand5 = new CliCommand(["admin", "delete"], [], jest.fn());
+			cliBuilder = new CliBuilder([
+				mockCommand1,
+				mockCommand2,
+				mockCommand3,
+				mockCommand4,
+				mockCommand5,
+			]);
+		});
+
+		it("should build the command tree correctly", () => {
+			const tree = cliBuilder.getCommandTree(cliBuilder.commands);
+			expect(tree).toEqual({
+				user: {
+					verify: mockCommand1,
+					delete: mockCommand2,
+					new: {
+						admin: mockCommand3,
+					},
+				},
+				admin: {
+					delete: mockCommand5,
+				},
+			});
+		});
+
+		it("should build the command tree correctly when there are no commands", () => {
+			cliBuilder = new CliBuilder([]);
+			const tree = cliBuilder.getCommandTree(cliBuilder.commands);
+			expect(tree).toEqual({});
+		});
+
+		it("should build the command tree correctly when there is only one command", () => {
+			cliBuilder = new CliBuilder([mockCommand1]);
+			const tree = cliBuilder.getCommandTree(cliBuilder.commands);
+			expect(tree).toEqual({
+				user: {
+					verify: mockCommand1,
+				},
+			});
+		});
+	});
 });