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