js-comint

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• js-comint.el (v1.2.0) Run a JavaScript interpreter in an inferior process window

The first release, [[http://js-comint-el.sourceforge.net/][js-comint 0.0.1, is hosted on sourceforge]] but it has not been updated for five years.

• Features

• Can select node.js versions using [[https://github.com/rejeep/nvm.el][nvm.el]]
• Use [[https://nodejs.org][node.js]] by default.
• When loading file, detect what API to be used automatically
• Based on js-comint hosted on http://js-comint-el.sourceforge.net/

• Installation ** Direct download of js-comint.el Place the js-comint.el somewhere say "~/mylisp/".

Insert below code to "~/.emacs.d/init.el", #+BEGIN_SRC elisp (add-to-list 'load-path "~/mylisp/") (require 'js-comint) #+END_SRC

** Using [[http://www.emacswiki.org/emacs/ELPA][ELPA]] Insert below code to "~/.emacs.d/init.el", #+BEGIN_SRC elisp (require 'package) (package-initialize) (add-to-list 'package-archives '("melpa" . "http://melpa.org/packages/")) (package-install 'js-comint) (require 'js-comint) #+END_SRC

** Using [[https://github.com/cask/cask][Cask]] Add js-comint to your Cask file: #+BEGIN_SRC elisp (depends-on "js-comint") #+END_SRC

** Windows On window, you may need below setup: #+begin_src elisp (setq js-comint-program-command "C:/Program Files/nodejs/node.exe") #+end_src

• Usage After installation, do M-x run-js to create a comint buffer with the JavaScript interpreter.

Please note the directory =node_modules= is automatically searched and appended into environment variable `NODE_PATH'. So you can use third party javascript without setup. For example, after =npm install --save moment=, run below command in js-comint shell, #+begin_src javascript require('moment')().format('YYYY-MM-DD'); #+end_src

You can =M-x js-clear= before =M-x js-send-buffer= to get clean output.

In order to get cleaner output when using NodeJS, I suggest add below setup into =.emacs=, #+begin_src elisp (defun inferior-js-mode-hook-setup () (add-hook 'comint-output-filter-functions 'js-comint-process-output)) (add-hook 'inferior-js-mode-hook 'inferior-js-mode-hook-setup t) #+end_src

• Customization You can set the js-comint-program-command' string and the js-comint-program-arguments' list to the executable that runs the JS interpreter and the arguments to pass to it respectively.

E.g., the default is: #+BEGIN_SRC elisp ;; You can also customize `js-comint-drop-regexp' to filter output (setq js-comint-program-command "node") (setq js-comint-program-arguments '("--interactive")) #+END_SRC

Note that in the example above, the version of node that is picked up will be the first found in `exec-path'.

But you could use Rhino or SpiderMonkey or whatever you want. E.g. to set up the Rhino JAR downloaded from https://github.com/mozilla/rhino, do

#+BEGIN_SRC elisp (setq js-comint-program-command "java") (setq js-comint-program-arguments '("-jar" "/absolute/path/to/rhino/js.jar")) #+END_SRC

If you have nvm, you can select the versions of node.js installed and run them. This is done thanks to =nvm.el=. =nvm.el= is optional. So you need manually install it.

To enable nvm support, run #+BEGIN_SRC elisp (js-do-use-nvm) #+END_SRC

The first time you start the JS interpreter with run-js, you will be asked to select a version of node.js. If you want to change version of node js, run ~(js-select-node-version)~.

You can add the following couple of lines to your .emacs/init file to take advantage of key bindings for sending things to the JavaScript REPL:

#+BEGIN_SRC elisp ; Remap Elisp's eval-last-sexp (C-x C-e) to eval JavaScript (define-key js-mode-map [remap eval-last-sexp] #'js-comint-send-last-sexp)) (define-key js-mode-map (kbd "C-c b") 'js-send-buffer)) #+END_SRC