add /eval_reset to clear your personal environment

README.md

@@ -1,7 +1,11 @@
 ## Adds `/eval` command
 
-`/eval` takes lua code as argument and executes it. It will echo your command and show it's output and returned value.
+`/eval` takes lua code as argument and executes it. It will echo your
-Each player gets their own "global" environment so they can't interfere with other user's envs by accident (exposed as `cmd_eval.e[player_name]`).
+command and show it's output and returned value.  Each player gets
+their own "global" environment so they can't interfere with other
+user's envs by accident (exposed as `cmd_eval.e[player_name]`).
+
+Type `/eval help` to see the built-in help.
 
 ## Some nice features:
 ### Expression/statement agnostic
@@ -230,3 +234,9 @@ You can still resume it by typing `/eval_resume <text>` - the argument
 text will be passed instead of the context of text area of the formspec.
 
 
+### Resetting your personal environment
+
+If your environment gets messed up, or you just want to get rid of the
+variables you've stored, you can type:
+
+`/eval_reset`

init.lua

@@ -425,6 +425,19 @@ core.register_chatcommand("eval_resume",
 )
 
 
+core.register_chatcommand("eval_reset",
+    {
+        description = "Restore your environment by clearing all variables you assigned",
+        privs = { server = true },
+        func = function(player_name, param)
+            core.log("action", string.format("[cmd_eval] %s reset their environmet", player_name, dump(param)))
+            api.e[player_name] = nil
+            return true, orange_fmt("* Your environment has been reset to default.")
+        end
+    }
+)
+
+
 core.register_on_player_receive_fields(
     function(player, formname, fields)
         if formname == "cmd_eval:dump" or formname == "cmd_eval:input" then