www.delorie.com/gnu/docs/emacs-lisp-intro/emacs-lisp-intro_92.html   search  
Buy the book!

Programming in Emacs Lisp

[ < ] [ > ]   [ << ] [ Up ] [ >> ]         [Top] [Contents] [Index] [ ? ]

5.2.2 The Body of the insert-buffer Function

The body of the insert-buffer function has two major parts: an or expression and a let expression. The purpose of the or expression is to ensure that the argument buffer is bound to a buffer and not just the name of a buffer. The body of the let expression contains the code which copies the other buffer into the current buffer.

In outline, the two expressions fit into the insert-buffer function like this:

(defun insert-buffer (buffer)
  (interactive "*bInsert buffer: ")
  (or ...
  (let (varlist)
      body-of-let... )

To understand how the or expression ensures that the argument buffer is bound to a buffer and not to the name of a buffer, it is first necessary to understand the or function.

Before doing this, let me rewrite this part of the function using if so that you can see what is done in a manner that will be familiar.

  webmaster   donations   bookstore     delorie software   privacy  
  Copyright 2003   by The Free Software Foundation     Updated Jun 2003