Optimized code runner and implemented basic IDE feature in app.ed

README.md

@@ -27,6 +27,14 @@ Current installation process doesn't involve any `.mpy` module compilation, so,
 
 As of now, T-DeckARD implements the following component modules.
 
+### `deck.runtime`
+
+A library for establishing runtime compatibility across various Python environments.
+
+Exported functions:
+
+- `runcode(code_string)`: compile and execute a Python program expressed as a string. Used by REPL and some applets.
+
 ### `deck.input`
 
 A library for single-line and multi-line (ed-like) text input.
@@ -240,6 +248,7 @@ The editor mode supports the following subset of POSIX ed commands in the standa
 - `s/old/new`: replace text in the range (doesn't support regex syntax from POSIX ed)
 - `f`: set the current filename to write to
 - `w`: save changes to the current filename
+- `x`: interpret the range as Python code and execute it immediately
 - `q`: quit (`q!` force-quits without prompting for saving changes)
 
 ### `app.llmchat`