Add a new language - Rukka

This is a (simple) lisp, partially for fun, partially for testing the
generic interfaces

src/main.rs

@@ -10,6 +10,7 @@ extern crate maplit;
 mod schala_lang;
 mod maaru_lang;
 mod robo_lang;
+mod rukka_lang;
 
 extern crate schala_lib;
 use schala_lib::{PLIGenerator, schala_main};
@@ -22,6 +23,7 @@ fn main() {
     Box::new(|| { Box::new(schala_lang::Schala::new())}),
     Box::new(|| { Box::new(maaru_lang::Maaru::new())}),
     Box::new(|| { Box::new(robo_lang::Robo::new())}),
+    Box::new(|| { Box::new(rukka_lang::Rukka::new())}),
   ];
   schala_main(generators);
 }

src/rukka_lang/mod.rs

@@ -0,0 +1,24 @@
+use itertools::Itertools;
+use schala_lib::{ProgrammingLanguageInterface, EvalOptions, ReplOutput};
+
+pub struct Rukka { }
+
+impl Rukka {
+  pub fn new() -> Rukka { Rukka { } }
+}
+
+impl ProgrammingLanguageInterface for Rukka {
+  fn get_language_name(&self) -> String {
+    "Rukka".to_string()
+  }
+
+  fn get_source_file_suffix(&self) -> String {
+    format!("rukka")
+  }
+
+  fn evaluate_in_repl(&mut self, input: &str, _eval_options: &EvalOptions) -> ReplOutput {
+    let mut output = ReplOutput::default();
+    output.add_output(format!("Everything is ()"));
+    output
+  }
+}