Show debug stages

schala-lang/src/lib.rs

@@ -111,4 +111,14 @@ impl ProgrammingLanguageInterface for Schala {
     ];
     chain(input)
   }
+
+  fn get_stages(&self) -> Vec<String> {
+    vec![
+      format!("tokenizing"),
+      format!("parsing"), //TODO handle both types of this
+      format!("symbol_table"),
+      format!("typechecking"),
+      format!("eval")
+    ]
+  }
 }

schala-repl/src/lib.rs

@@ -22,6 +22,7 @@ use std::process::exit;
 use std::default::Default;
 use std::fmt::Write as FmtWrite;
 
+use itertools::Itertools;
 use rustyline::error::ReadlineError;
 use rustyline::Editor;
 use self::colored::*;
@@ -148,6 +149,10 @@ impl Repl {
     }
   }
 
+  fn get_cur_language(&self) -> &ProgrammingLanguageInterface {
+    self.languages[self.current_language_index].as_ref()
+  }
+
   fn get_options() -> EvalOptions {
     File::open(".schala_repl")
       .and_then(|mut file| {
@@ -284,14 +289,20 @@ impl Repl {
     }
   }
   fn handle_debug(&mut self, commands: Vec<&str>) -> Option<String> {
+    let stages = self.get_cur_language().get_stages();
     match commands.get(1) {
+      Some(&"stages") => Some(stages.into_iter().intersperse(format!(" -> ")).collect()),
       b @ Some(&"show") | b @ Some(&"hide") => {
         let show = b == Some(&"show");
         let debug_stage = match commands.get(2) {
           Some(s) => s,
           None => return Some(format!("Must specify a stage to debug")),
         };
-        None
+        let maybe_debug = stages.iter().find(|stage_name| stage_name == debug_stage);
+        match maybe_debug {
+          Some(s) => Some(format!("Will debug {}", s)),
+          None => Some(format!("couldn't find it"))
+        }
       },
       _ => Some(format!("Unknown debug command"))
     }