diff --git a/schala-lang/language/src/lib.rs b/schala-lang/language/src/lib.rs
index bc1fbeb..d44815a 100644
--- a/schala-lang/language/src/lib.rs
+++ b/schala-lang/language/src/lib.rs
@@ -23,7 +23,7 @@ use std::cell::RefCell;
 use std::rc::Rc;
 
 use itertools::Itertools;
-use schala_repl::{ProgrammingLanguageInterface, EvalOptions, TraceArtifact, UnfinishedComputation, FinishedComputation};
+use schala_repl::{ProgrammingLanguageInterface, EvalOptions, TraceArtifact, UnfinishedComputation, FinishedComputation, ComputationRequest, ComputationResponse, GlobalOutputStats};
 
 macro_rules! bx {
   ($e:expr) => { Box::new($e) }
@@ -43,12 +43,14 @@ mod reduced_ast;
 mod eval;
 
 //trace_macros!(true);
+/*
 #[derive(ProgrammingLanguageInterface)]
 #[LanguageName = "Schala"]
 #[SourceFileExtension = "schala"]
 #[PipelineSteps(load_source, tokenizing, parsing(compact,expanded,trace), symbol_table, typechecking, ast_reducing, eval)]
 #[DocMethod = "get_doc"]
 #[HandleCustomInterpreterDirectives = "handle_custom_interpreter_directives"]
+*/
 /// All bits of state necessary to parse and execute a Schala program are stored in this struct.
 /// `state` represents the execution state for the AST-walking interpreter, the other fields
 /// should be self-explanatory.
@@ -218,3 +220,30 @@ impl SourceReference {
     self.lines.as_ref().and_then(|x| x.get(line).map(|s| s.to_string())).unwrap_or(format!("NO LINE FOUND"))
   }
 }
+
+impl ProgrammingLanguageInterface for Schala {
+  fn get_language_name(&self) -> String { format!("Schala") }
+  fn get_source_file_suffix(&self) -> String { format!("schala") }
+
+  fn run_computation(&mut self, request: ComputationRequest) -> ComputationResponse {
+    let ComputationRequest { source, debug_requests } = request;
+
+    load_source(&source, self, None);
+    let main_output: Result<String, String> = tokenizing(&source, self, None)
+      .and_then(|tokens| parsing(tokens, self, None))
+      .and_then(|ast| symbol_table(ast, self, None))
+      .and_then(|ast| typechecking(ast, self, None))
+      .and_then(|ast| ast_reducing(ast, self, None))
+      .and_then(|reduced_ast| eval(reduced_ast, self, None));
+
+    ComputationResponse {
+      main_output,
+      global_output_stats: GlobalOutputStats::default(),
+      debug_responses: vec![],
+    }
+  }
+
+  fn repl_request(&self, repl_request: String) -> String {
+    format!("Schala: can't understand {}", repl_request)
+  }
+}
diff --git a/schala-repl/Cargo.toml b/schala-repl/Cargo.toml
index 9dfc308..6c9a10c 100644
--- a/schala-repl/Cargo.toml
+++ b/schala-repl/Cargo.toml
@@ -8,10 +8,10 @@ edition = "2018"
 llvm-sys = "70.0.2"
 take_mut = "0.2.2"
 itertools = "0.5.8"
-getopts = "*"
+getopts = "0.2.18"
 lazy_static = "0.2.8"
 maplit = "*"
-colored = "1.5"
+colored = "1.7"
 serde = "1.0.15"
 serde_derive = "1.0.15"
 serde_json = "1.0.3"
diff --git a/schala-repl/src/lib.rs b/schala-repl/src/lib.rs
index 4d12354..013e9ec 100644
--- a/schala-repl/src/lib.rs
+++ b/schala-repl/src/lib.rs
@@ -57,7 +57,7 @@ fn command_line_options() -> getopts::Options {
 /* --------------------------- */
 
 pub use language::{ProgrammingLanguageInterface, EvalOptions,
-  ExecutionMethod, TraceArtifact, FinishedComputation, UnfinishedComputation, PassDebugOptionsDescriptor, PassDescriptor};
+  ExecutionMethod, TraceArtifact, FinishedComputation, UnfinishedComputation, PassDebugOptionsDescriptor, PassDescriptor, ComputationRequest, ComputationResponse, GlobalOutputStats};
 
 pub type PLIGenerator = Box<Fn() -> Box<ProgrammingLanguageInterface> + Send + Sync>;
 
diff --git a/schala-repl/src/repl/mod.rs b/schala-repl/src/repl/mod.rs
index a673066..11186ed 100644
--- a/schala-repl/src/repl/mod.rs
+++ b/schala-repl/src/repl/mod.rs
@@ -6,7 +6,7 @@ use std::sync::Arc;
 use colored::*;
 use itertools::Itertools;
 use crate::language::{ProgrammingLanguageInterface, EvalOptions,
-  PassDebugOptionsDescriptor};
+  PassDebugOptionsDescriptor, ComputationRequest, ComputationResponse};
 mod command_tree;
 use self::command_tree::CommandTree;
 
@@ -96,11 +96,29 @@ impl NewRepl {
   }
 
   fn handle_interpreter_directive(&mut self, input: &str) -> Option<String> {
-    None
+    Some(format!("you typed {}, which is unsupported", input))
+  }
+
+  fn get_cur_language_state(&mut self) -> &mut Box<ProgrammingLanguageInterface> {
+    //TODO this is obviously not complete
+    &mut self.language_states[0]
   }
 
   fn handle_input(&mut self, input: &str) -> String {
-    format!("")
+    let ref mut language_state = self.get_cur_language_state();
+
+    let request = ComputationRequest {
+      source: input.to_string(),
+      debug_requests: vec![],
+    };
+
+    let ComputationResponse { main_output, global_output_stats, debug_responses }
+      = language_state.run_computation(request);
+
+    match main_output {
+      Ok(s) => s,
+      Err(e) => format!("{} {}", "Error".red(), e)
+    }
   }
 }