Loading a file of Lisp code means bringing its contents into the Lisp environment in the form of Lisp objects. Emacs finds and opens the file, reads the text, evaluates each form, and then closes the file. Such a file is also called a Lisp library.
The load functions evaluate all the expressions in a file just
eval-buffer function evaluates all the
expressions in a buffer. The difference is that the load functions
read and evaluate the text in the file as found on disk, not the text
in an Emacs buffer.
The loaded file must contain Lisp expressions, either as source code or as byte-compiled code. Each form in the file is called a top-level form. There is no special format for the forms in a loadable file; any form in a file may equally well be typed directly into a buffer and evaluated there. (Indeed, most code is tested this way.) Most often, the forms are function definitions and variable definitions.
For on-demand loading of external libraries, see Dynamic Libraries.
|• How Programs Do Loading:||The |
|• Load Suffixes:||Details about the suffixes that |
|• Library Search:||Finding a library to load.|
|• Loading Non-ASCII:||Non-ASCII characters in Emacs Lisp files.|
|• Autoload:||Setting up a function to autoload.|
|• Repeated Loading:||Precautions about loading a file twice.|
|• Named Features:||Loading a library if it isn’t already loaded.|
|• Where Defined:||Finding which file defined a certain symbol.|
|• Unloading:||How to "unload" a library that was loaded.|
|• Hooks for Loading:||Providing code to be run when particular libraries are loaded.|