WIP Commit for stackoverflow

src/bin/main.rs

@@ -14,6 +14,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+#![feature(type_alias_impl_trait)]
 
 use rustyline::error::ReadlineError;
 use rustyline::Editor;

src/lib.rs

@@ -15,6 +15,8 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#![feature(type_alias_impl_trait)]
+
 mod segment;
 mod lex;
 mod func;

src/vars.rs

@@ -21,7 +21,7 @@ use std::collections::HashMap;
 use std::env;
 use crate::segment::{Ctr, Ast, ast_to_string};
 use crate::eval::eval;
-use crate::func::{Function, Operation, Args, FTable};
+use crate::func::{Function, Operation, InternalOperation, Args, FTable};
 /* Mapping between a string token and a tree of Segments
  * The string token can be found in any Ctr::Symbol value
  * it is expected that the trees stored are already evaluated
@@ -45,7 +45,11 @@ pub fn get_export(env_cfg: bool) -> Function {
         loose_syms: true,
         eval_lazy: true,
         args: Args::Lazy(2),
-        function: Operation::Internal(
+        function: Operation::Internal(get_export_callback(env_cfg)),
+    };
+}
+
+fn get_export_callback(env_cfg: bool) -> InternalOperation {
     |a: Ast, b: Rc<RefCell<VTable>>, c: Rc<RefCell<FTable>>| -> Ctr {
         let inner = a.borrow_mut();
         match &inner.car {
@@ -81,6 +85,9 @@ pub fn get_export(env_cfg: bool) -> Function {
 
                     Ctr::None => {
                         (*b).borrow_mut().remove(identifier);
+                        if env_cfg {
+                            // TODO: unset variable
+                        }
                     },
 
                     _ => eprintln!("args not in standard form")
@@ -92,6 +99,4 @@ pub fn get_export(env_cfg: bool) -> Function {
 
         return Ctr::None;
     }
-        )
-    };
 }