This page is a tutorial on how to install emacs packages.
If you are using emacs 24, you should use its ELPA package system. See: Emacs: How to Install Packages Using ELPA, MELPA, Marmalade.
There are hundreds of useful emacs packages on the web that are not bundled with emacs. Often, there is no install instruction included, and you may notice that each's installation methods seem to differ wildly. The following gives a overview on how emacs package are installed.
Suppose you downloaded a simple emacs package on the web named “xyz.el”. To use the package, all you have to do is to make emacs load the file.
load-file(type 【Alt+x】) then give the file path.
xyz.el, then the command to activate it is typically “xyz” or “xyz-mode”.
If you want emacs to load the file when it starts,
put the file in the dir
~/.emacs.d/lisp/, then put the following in your emacs init file:
;; Tell emacs where is your personal elisp lib dir (add-to-list 'load-path "~/.emacs.d/lisp/") ;; load the packaged named xyz. (load "xyz") ;; best not to include the ending “.el” or “.elc”
By convention, the
~/.emacs.d/ is a dir for all your personal emacs files. It is the default value of the variable user-emacs-directory. On Windows, the path is
〔➤ Windows Environment Variables Basic Tutorial〕
Emacs 23 should have created this dir for you. If it's not there, you can just create it yourself.
By convention, the dir
~/.emacs.d/lisp/ is for packages you manually installed.
(ELPA packages are installed at
Elisp source code can be byte compiled. When a file is byte compiled, it loads faster, and the functions will run faster too (about 6 times faster). For simple packages, the difference in speed is not noticeable.
To compile your code, call
byte-compile-file. Once you compiled the code, you'll get a file with suffix “.elc”.
You can byte-compile multiple files. In
dired, press m to mark them (press u to unmark), then press B (
〔➤ File Management with Emacs (dired tutorial)〕
(info "(elisp) Byte Compilation")
This is usually setup by the package, but not always. Here's the basics:
;; setup files ending in “.js” to open in js2-mode (add-to-list 'auto-mode-alist '("\\.js\\'" . js2-mode))
For detail, see: Emacs: How to Associate a File with a Major Mode?.
Emacs mode usually comes with inline documentation. To view it, first activate the mode (【Alt+x mode name】). Once in the mode, call
【F1 m 】. Emacs will show its inline documentation.
Robust modes usually have graphical menus too. So, activate the mode, then you can check what menu commands it has in the menu bar.
Sometimes, a mode comes with complete documentation in
info format (file with suffix “.info”). To read the info, type 【Ctrl+u Alt+x info】 then type the info file's name.
See: Emacs Lisp's Library System.