diff --git a/schala-repl/src/repl/command_tree.rs b/schala-repl/src/repl/command_tree.rs
index 4ba5167..dcf19ac 100644
--- a/schala-repl/src/repl/command_tree.rs
+++ b/schala-repl/src/repl/command_tree.rs
@@ -1,16 +1,18 @@
+use super::Repl;
+
+type BoxedCommandFunction = Box<(fn(&mut Repl, Vec<String>) -> Option<String>)>;
 
 #[derive(Clone)]
 pub enum CommandTree {
   Terminal {
     name: String,
     help_msg: Option<String>,
-    function: Option<Box<(fn() -> Option<String>)>>,
+    function: Option<BoxedCommandFunction>,
   },
   NonTerminal {
     name: String,
     children: Vec<CommandTree>,
     help_msg: Option<String>,
-    function: Option<Box<(fn() -> Option<String>)>>,
   },
   Top(Vec<CommandTree>),
 }
@@ -20,12 +22,15 @@ impl CommandTree {
     CommandTree::Terminal {name: s.to_string(), help_msg: help.map(|x| x.to_string()), function: None }
   }
 
+  pub fn term_with_function(s: &str, help: Option<&str>, func: BoxedCommandFunction) -> CommandTree {
+    CommandTree::Terminal {name: s.to_string(), help_msg: help.map(|x| x.to_string()), function: Some(func) }
+  }
+
   pub fn nonterm(s: &str, help: Option<&str>, children: Vec<CommandTree>) -> CommandTree {
     CommandTree::NonTerminal {
       name: s.to_string(),
       help_msg: help.map(|x| x.to_string()),
       children,
-      function: None,
     }
   }