Info Node: (emacs-lisp-intro.info)insert-buffer body
(emacs-lisp-intro.info)insert-buffer body
The Body of the `insert-buffer' Function
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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)
"DOCUMENTATION..."
(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.
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