Description

espresso-mode is a Javascript-mode for GNU Emacs.

Its features include:

• Good performance editing even very large files
• Support for cc-mode's smart comment wrapping and indentation
• C preprocessor support — yes, people use this with Javascript
• Full suite of movement commands, including beginning-of-defun, end-of-defun, and so on. This feature allows commands like narrow-to-defun work correctly.
• Configurable recognition of class definitions. Javascript, being a prototype-based language, has no "classes" per se, but there are constructions that have the same conceptual meaning. espresso-mode recognizes class definitions from several popular Javascript frameworks, including:
  • Plain Javascript (manipulating prototype directly)
  • MochiKit
  • Prototype
  • Dojo
  • ExtJS
• Hierarchical imenu support using the aforementioned class definition recognition with support for classes, methods, top-level functions and nested classes.
• Robust fontification of regular expression literals
• Support for Javascript 1.6, Javascript 1.7, and Javascript 1.8 features, making espresso-mode useful for editing Mozilla chrome.
• Mozilla integration via MozRepl. Update Javascript running Javascript without reloading. Also works with chrome.

Installation

Download espresso.el and put it somewhere in your load-path. Then add the following to your .emacs:

 (autoload #'espresso-mode "espresso" "Start espresso-mode" t)
 (add-to-list 'auto-mode-alist '("\\.js$" . espresso-mode))
 (add-to-list 'auto-mode-alist '("\\.json$" . espresso-mode))

For integration into Mozilla, you'll need to install MozRepl, and put moz.el somewhere in your load-path. If you're running Emacs 22, you'll also need json.el.

Important: For best performance, espresso.el must be byte-compiled. Use M-x byte-compile-file to compile espresso.el.

Also, you can also always try the SVN HEAD version of espresso.el.

History

Version 9: 2009年07月25日

• Fix bug with single-character regular expressions
• Emacs 23 compatibility fixes

Version 8: 2009年05月26日

• Fixed customization problem

Version 7: 2009年05月22日

• MozRepl integration for updating running code
• Performance and robustness improvements
• Support for JS 1.7 and 1.8 syntactic constructs
• Better comment indentation
• elisp<->javascript bridge code

Version 5: 2009年04月24日

• Vastly improved performance for larger files
• Direct indexing support for popular Javascript frameworks
• Configurable set of recognized frameworks
• Robust defun-movement support with an option to navigate functions as either a tree or a flat list (controlled by espresso-flat-functions

espresso-mode began as a fork of Karl Landstrom's javascript-mode.

Additional information and bug reports

Please see the espresso-mode Savannah project page for additional information and support.