diff -r b048f99cd483 -r 553cd0c5e983 progs/fun/funt.sc
--- a/progs/fun/funt.sc	Fri Nov 27 13:53:06 2020 +0000
+++ b/progs/fun/funt.sc	Tue Dec 01 05:41:12 2020 +0000
@@ -1,5 +1,20 @@
 // A Small Compiler for a Simple Functional Language
-// (includes a lexer and a parser)
+//  - includes a lexer and a parser
+//  - performs tail-call optimisations
+//
+// call with
+//
+//    amm fun.sc main defs.fun
+//    amm fun.sc main fact.fun
+//
+//  or
+// 
+//    amm fun.sc run defs.fun
+//    amm fun.sc run fact.fun   
+//
+// the first prints out the JVM instructions
+// the second runs the generated class files
+
 
 import $file.fun_tokens, fun_tokens._
 import $file.fun_parser, fun_parser._ 
@@ -26,7 +41,8 @@
 // calculating the maximal needed stack size
 def max_stack_exp(e: Exp): Int = e match {
   case Call(_, args) => args.map(max_stack_exp).sum
-  case If(a, e1, e2) => max_stack_bexp(a) + (List(max_stack_exp(e1), max_stack_exp(e2)).max)
+  case If(a, e1, e2) => 
+    max_stack_bexp(a) + (List(max_stack_exp(e1), max_stack_exp(e2)).max)
   case Write(e) => max_stack_exp(e) + 1
   case Var(_) => 1
   case Num(_) => 1
@@ -61,15 +77,19 @@
 
 type Env = Map[String, Int]
 
+def compile_op(op: String) = op match {
+  case "+" => i"iadd"
+  case "-" => i"isub"
+  case "*" => i"imul"
+  case "/" => i"idiv"
+  case "%" => i"irem"
+}
 
 def compile_expT(a: Exp, env : Env, name: String) : String = a match {
   case Num(i) => i"ldc $i"
   case Var(s) => i"iload ${env(s)}"
-  case Aop("+", a1, a2) => compile_expT(a1, env, "") ++ compile_expT(a2, env, "") ++ i"iadd"
-  case Aop("-", a1, a2) => compile_expT(a1, env, "") ++ compile_expT(a2, env, "") ++ i"isub"
-  case Aop("*", a1, a2) => compile_expT(a1, env, "") ++ compile_expT(a2, env, "") ++ i"imul"
-  case Aop("/", a1, a2) => compile_expT(a1, env, "") ++ compile_expT(a2, env, "") ++ i"idiv"
-  case Aop("%", a1, a2) => compile_expT(a1, env, "") ++ compile_expT(a2, env, "") ++ i"irem"
+  case Aop(op, a1, a2) => 
+    compile_expT(a1, env, "") ++ compile_expT(a2, env, "") ++ compile_op(op)
   case If(b, a1, a2) => {
     val if_else = Fresh("If_else")
     val if_end = Fresh("If_end")
@@ -141,6 +161,22 @@
   (library + instructions).replaceAllLiterally("XXX", class_name)
 }
 
+import ammonite.ops._
+
+def compile_to_file(prog: List[Decl], class_name: String) : Unit = 
+  write.over(pwd / s"$class_name.j", compile(prog, class_name))  
+
+def compile_and_run(prog: List[Decl], class_name: String) : Unit = {
+  println(s"Start of compilation")
+  compile_to_file(prog, class_name)
+  println(s"generated $class_name.j file")
+  os.proc("java", "-jar", "jasmin.jar", s"$class_name.j").call()
+  println(s"generated $class_name.class file")
+  println(s"Run program")
+  os.proc("java", s"${class_name}/${class_name}").call(stdout = os.Inherit)
+  println(s"done.")
+}
+
 
 @main
 def main(fname: String) = {
@@ -151,18 +187,11 @@
     println(compile(ast, class_name))
 }
 
-/*
-
-import scala.sys.process._
-
-def compile_run(class_name: String) : Unit = {
-  compile_file(class_name)
-  (s"java -jar jvm/jasmin-2.4/jasmin.jar ${class_name}.j").!!
-  println("Time: " + time_needed(2, (s"java ${class_name}/${class_name}").!))
+@main
+def run(fname: String) = {
+    val path = os.pwd / fname
+    val class_name = fname.stripSuffix("." ++ path.ext)
+    val tks = tokenise(os.read(path))
+    val ast = parse_tks(tks)
+    compile_and_run(ast, class_name)
 }
-
-
-//examples
-compile_run("defs")
-compile_run("fact")
-*/