Did some minor things

.idea/misc.xml

@@ -1,4 +1,3 @@
-<?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="21" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />

src/Main.kt

@@ -1,5 +1,65 @@
-//TIP To <b>Run</b> code, press <shortcut actionId="Run"/> or
-// click the <icon src="AllIcons.Actions.Execute"/> icon in the gutter.
-fun main() {
-    println("Gurr Gurr");
+import java.io.BufferedReader
+import java.io.File
+import java.io.IOException
+import java.io.InputStreamReader
+import java.util.Scanner
+import kotlin.jvm.Throws
+import kotlin.system.exitProcess
+
+var hadError = false
+
+@Throws(IOException::class)
+fun main(args: Array<String>) {
+    if(args.size > 1){
+        println("Usage: pigeon [script]")
+        exitProcess(64)
+    } else if (args.size == 1) {
+        runFile(args[0])
+    } else {
+        runPrompt()
+    }
+}
+
+@Throws(IOException::class)
+fun runFile(path: String) {
+    val bytes = File(path).readBytes()
+    run(bytes.toString())
+
+    if (hadError){
+        exitProcess(65)
+    }
+}
+
+@Throws(IOException::class)
+fun runPrompt() {
+    val input = InputStreamReader(System.`in`)
+    val reader = BufferedReader(input)
+
+    while (true) {
+        print("> ")
+        val line = reader.readLine()
+        if (line == null)
+            break
+
+        run(line)
+        hadError = false
+    }
+}
+
+fun run(source: String) {
+    val scanner = Scanner(source)
+    val tokens = scanner.tokens()
+
+    tokens.forEach { token ->
+        println("$token")
+    }
+}
+
+fun error(line: Int, message: String) {
+    report(line, "", message)
+}
+
+fun report(line: Int, where: String, message: String) {
+    System.err.println("[line $line] Error $where: $message")
+    hadError = true
 }