Refactored interpreter into just functions, added a REPL to the main kraken.

stdlib/io.krak

@@ -7,7 +7,21 @@ ext fun fprintf(file: *void, format: *char, ...): int
 ext fun snprintf(to_str: *char, num: ulong, format: *char, ...): int
 ext fun fflush(file: int): int
 ext var stderr: *void
+ext fun fgets(buff: *char, size: int, file: *void): *char
+ext var stdin: *void
 
+// dead simple stdin
+fun get_line(prompt: string::string, line_size: int): string::string {
+    print(prompt)
+    return get_line(line_size)
+}
+fun get_line(line_size: int): string::string {
+    var buff = new<char>(line_size)
+    fgets(buff, line_size, stdin)
+    var to_ret = string::string(buff)
+    delete(buff)
+    return to_ret.slice(0,-2) // remove '\n'
+}
 fun printlnerr<T>(toPrint: T) : void {
     printerr(toPrint)
     printerr("\n")