Help message

schala-repl/src/repl/mod.rs

@@ -138,6 +138,31 @@ impl Repl {
     }
   }
 
+  fn print_help_message(&mut self) -> String {
+    let mut buf = String::new();
+    let directives = match self.get_directives() {
+      CommandTree::Top(children) => children,
+      _ => panic!("Top-level CommandTree not Top")
+    };
+
+    writeln!(buf, "MetaInterpreter options").unwrap();
+    writeln!(buf, "-----------------------").unwrap();
+
+    for directive in directives {
+      let trailer = " ";
+      writeln!(buf, "{}{}- {}", directive.get_cmd(), trailer, directive.get_help()).unwrap();
+    }
+
+    let ref lang = self.get_cur_language_state();
+    writeln!(buf, "").unwrap();
+    writeln!(buf, "Language-specific help for {}", lang.get_language_name()).unwrap();
+    writeln!(buf, "-----------------------").unwrap();
+    //writeln!(buf, "{}", lang.custom_interpreter_directives_help()).unwrap();
+    //writeln!(buf, "{}", "<not implemented>").unwrap();
+    buf
+  }
+
+
   fn get_cur_language_state(&mut self) -> &mut Box<ProgrammingLanguageInterface> {
     //TODO this is obviously not complete
     &mut self.language_states[0]
@@ -191,7 +216,9 @@ impl Repl {
         repl.save_before_exit();
         ::std::process::exit(0)
       })),
-      CommandTree::term("help", Some("Print this help message")),
+      CommandTree::term_with_function("help", Some("Print this help message"), Box::new(|repl: &mut Repl, _cmds: Vec<&str>| {
+        Some(repl.print_help_message())
+      })),
       CommandTree::nonterm("debug",
         Some("show or hide pass debug info for a given pass, or display the names of all passes, or turn timing on/off"),
         vec![