Babel REPL for emacs

Acknowledgement

Thanks tmtxt for his plugin n4js.el

Dependencies

• babel-cli: npm install -g babel-cli

Installation

Melpa

babel-repl

Manual install

• Clone it into your .emacs.d and add it into load path

(add-to-list 'load-path "~/.emacs.d/babel-repl/")

Load the library

• Load the library with require

(require 'babel-repl)

Weird characters workaround

If you get weird characters in your REPL. Add this code snippet to your configuration file.

(require 'comint)
(add-to-list 'comint-preoutput-filter-functions
             (lambda (output)
               (replace-regexp-in-string "\033\\[[0-9]+[A-Z]" "" output)))

Variables

Change these variables based on your demand

• babel-repl-cli-program: the name of babel node cli program, default to babel-node. Change it to absolute path if it's not in your load path.

(setq babel-repl-cli-program "/path/to/babel-node")

• babel-repl-cli-arguments: the list of arguments to pass to babel-node.

• babel-repl-pop-to-buffer: whether to pop up the babel shell buffer after sending command to execute.

• babel-repl-pop-to-buffer-function: the function used for pop up the babel node buffer if the above variable is set to t. Default is pop-to-buffer. An example is pop-to-buffer to pop up the babel buffer to current window instead of other window.

Commands

• babel-repl: start a babel node process
• babel-repl-send-current-region: send the active region to babel node process
• babel-repl-send-buffer: send the whole buffer to babel node process
• babel-repl-send-paragraph: send the paragraph at point to babel node process
• babel-repl-send-region-or-buffer: send the current region if active, otherwise send the whole buffer to babel node process
• babel-repl-send-dwim: send the current region if active, otherwise send the paragraph at point to babel node process
• babel-repl-switch-to-buffer: switch to babel node buffer if exist, otherwise, start a new one

Connect to a babel shell with option

(setq babel-repl-cli-arguments '("--trace-sync-io"))

Demo