Emacs: How to Evaluate Emacs Lisp Code
This page shows you how to evaluate emacs lisp code.
To evaluate a single lisp expression, move your cursor to the right of the last closing parenthesis, and call
eval-last-sexp 【Ctrl+x Ctrl+e】.
To evaluate all elisp code in a text selection, call
Here's a list of other ways, roughly in order of usefulness:
|Command Name||Acting Area||Key|
|the complete lisp expression to the left of cursor||【Ctrl+x Ctrl+e】|
|the function definition block (defun) the cursor is in.|
(the elisp code must be well-indended, otherwise emacs may have problem finding function.)
(only when in lisp modes)
|whole file in current window||◇|
|prompts you for a file name||【L】 in dired.|
|prompts you to type code||【Alt+:】 or 【Esc :】|
If a command does not have key, you can give it a key. 〔➤see Emacs: How to Define Keys〕 Or you can give them a alias for convenience, ➢ for example: “eb” for
eval-buffer. 〔➤see Emacs: Use Alias for Fast M-x〕
Interactive Command Line Interfaces
Emacs has a interactive emacs lisp shell. Call
ielm to start.
Note: coding lisp in a command line interface may not be the most convenient. I recommend you work in a buffer instead. That way, you can use the full power of emacs to edit any part of your code, and evaluate any part you want.