refactor: use scalafmt to format code

.editorconfig

@@ -0,0 +1,12 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+insert_final_newline = true
+
+[Makefile]
+indent_style = tab
+indent_size = 4
+

.scalafmt.conf

@@ -0,0 +1,2 @@
+version = 3.8.6
+runner.dialect = scala36

src/main/wacc/Main.scala

@@ -3,13 +3,14 @@ package wacc
 import parsley.{Success, Failure}
 
 def main(args: Array[String]): Unit = {
-    println("hello WACC!")
+  println("hello WACC!")
 
-    args.headOption match {
-        case Some(expr) => parser.parse(expr) match {
-            case Success(x) => println(s"$expr = $x")
-            case Failure(msg) => println(msg)
-        }
-        case None => println("please enter an expression")
-    }
+  args.headOption match {
+    case Some(expr) =>
+      parser.parse(expr) match {
+        case Success(x)   => println(s"$expr = $x")
+        case Failure(msg) => println(msg)
+      }
+    case None => println("please enter an expression")
+  }
 }

src/main/wacc/lexer.scala

@@ -5,12 +5,12 @@ import parsley.token.Lexer
 import parsley.token.descriptions.*
 
 object lexer {
-    private val desc = LexicalDesc.plain.copy(
-        // your configuration goes here
-    )
-    private val lexer = Lexer(desc)
+  private val desc = LexicalDesc.plain.copy(
+    // your configuration goes here
+  )
+  private val lexer = Lexer(desc)
 
-    val integer = lexer.lexeme.integer.decimal
-    val implicits = lexer.lexeme.symbol.implicits
-    def fully[A](p: Parsley[A]): Parsley[A] = lexer.fully(p)
+  val integer = lexer.lexeme.integer.decimal
+  val implicits = lexer.lexeme.symbol.implicits
+  def fully[A](p: Parsley[A]): Parsley[A] = lexer.fully(p)
 }

src/main/wacc/parser.scala

@@ -7,14 +7,14 @@ import lexer.implicits.implicitSymbol
 import lexer.{integer, fully}
 
 object parser {
-    def parse(input: String): Result[String, BigInt] = parser.parse(input)
-    private val parser = fully(expr)
-    
-    private val add = (x: BigInt, y: BigInt) => x + y
-    private val sub = (x: BigInt, y: BigInt) => x - y
+  def parse(input: String): Result[String, BigInt] = parser.parse(input)
+  private val parser = fully(expr)
 
-    private lazy val expr: Parsley[BigInt] =
-        chain.left1(integer | "(" ~> expr <~ ")")(
-            ("+" as add) | ("-" as sub)
-        )
+  private val add = (x: BigInt, y: BigInt) => x + y
+  private val sub = (x: BigInt, y: BigInt) => x - y
+
+  private lazy val expr: Parsley[BigInt] =
+    chain.left1(integer | "(" ~> expr <~ ")")(
+      ("+" as add) | ("-" as sub)
+    )
 }