Implement CLI

Use CLI (new 'rsc') instead of Runner (old 'RustScript')

Cli.java

@@ -0,0 +1,65 @@
+import java.util.List;
+import java.util.Arrays;
+
+/**
+ * @author William Rågstad <william.ragstad@gmail.com>
+ * @version 0.1.0
+ *
+ *          The CLI is a simple command line interface for the RustScript
+ *          language. It provides a simple way to run RustScript script files
+ *          and interact in a playful way using the REPL mode. Sometime in the
+ *          future, this might be extended to include a compiler to other
+ *          languages like JavaScript, C++ or Python.
+ */
+public class Cli {
+	private static final String VERSION = "0.1.0";
+	private static final String DESCRIPTION = "A command line interface tool for the RustScript language.";
+	private static final String COPYRIGHT = "Copyright (c) 2021 William Rågstad";
+	private static final String HELP = String.format("""
+			RustScript CLI version %s.
+			%s
+
+			Usage: rsc (options) (files)
+
+			Options:
+				-h, --help
+					Prints this help message.
+				-v, --version
+					Prints the version of the program.
+				-r, --repl
+					Starts the REPL mode.
+				-c, --compile [files]          (Not implemented)
+					Compiles the given files.
+				-l, --lint [files]             (Not implemented)
+					Lints the given files.
+
+			Execute scripts: rsc [files]
+				Interprets the given script files one at a time.
+
+			%s""", VERSION, DESCRIPTION, COPYRIGHT);
+
+	public static void main(String[] args) {
+		List<String> argsList = Arrays.asList(args).stream()
+				.map((String option) -> option.startsWith("-") ? option.toLowerCase() : option).toList();
+		if (argsList.contains("--help") || argsList.contains("-h")) {
+			System.out.println(HELP);
+		} else if (argsList.contains("--version") || argsList.contains("-v")) {
+			System.out.println(VERSION);
+		} else if (argsList.contains("--repl") || argsList.contains("-r")) {
+			Repl.run();
+		} else {
+			if (argsList.size() > 0) {
+				if (argsList.stream().anyMatch((String option) -> option.startsWith("-"))) {
+					// Unknown option found
+					System.out.println("Unknown option");
+				} else {
+					// All args are files
+					Runner.run(args);
+				}
+			} else {
+				System.out.println(HELP);
+			}
+		}
+		// TODO: Add linting and compilation
+	}
+}

README.md

@@ -33,15 +33,15 @@ There are global variables though.
 Run a script using the following command.
 
 ```shell
-java -jar RustScript.jar <script>
+java -jar rsc.jar <script>
 ```
 
 ### 🔨 Build
 
 If you want to build RustScript on your own, run the command below to build the `Runner.java` class into a standalone executable.
 
 ```shell
-jar -cvmf manifest.txt RustScript.jar *.class core/*.class
+jar -cvmf manifest.txt rsc.jar *.class core/*.class
 ```
 
 
@@ -230,10 +230,10 @@ fold(lcm, 1, [1..20])
 
 > The sum of the squares of the first ten natural numbers is,
 > 1^2 + 2^2 + ... + 10^2 = 385$$
-> 
+>
 > The square of the sum of the first ten natural numbers is,
 > (1 + 2 + ... + 10)^2 = 55^2 = 3025$$
-> 
+>
 >Hence the difference between the sum of the squares of the first ten natural numbers and the square of the sum is $3025 - 385 = 2640$.
 >Find the difference between the sum of the squares of the first one hundred natural numbers and the square of the sum.
 

manifest.txt

@@ -1 +1 @@
-Main-Class: Runner
+Main-Class: Cli