Emacs Lisp 打印输出

Question

我运行了以下代码，在暂存缓冲区和 ielm repl 中打印了 i 的 15 个连续值:

    (defvar i 0)
    (while (< i 15)
       (print i)
       (setq i (+ i 1)))`

我在临时缓冲区和 repl 中注意到的是，它们都只显示 sexp 的结果值。 i 的打印值然后被发送到 Messages 缓冲区。

1. 至少对于 repl，我怎样才能得到打印在 repl 中的 i 的值？
2. 如果您有其他适合您的解决方案，请告诉我!

请注意，我通过终端和 Ubuntu 12.04 LTS 使用 emacs 24.3。感谢所有的帮助!

另外，从 print 的文档我们有:

print is a built-in function in `C source code'.

(print OBJECT &optional PRINTCHARFUN)

Output the printed representation of OBJECT, with newlines around it.
Quoting characters are printed when needed to make output that `read'
can handle, whenever this is possible.  For complex objects, the behavior
is controlled by `print-level' and `print-length', which see.

OBJECT is any of the Lisp data types: a number, a string, a symbol,
a list, a buffer, a window, a frame, etc.

A printed representation of an object is text which describes that object.

Optional argument PRINTCHARFUN is the output stream, which can be one
of these:

   - a buffer, in which case output is inserted into that buffer at point;
   - a marker, in which case output is inserted at marker's position;
   - a function, in which case that function is called once for each
     character of OBJECT's printed representation;
   - a symbol, in which case that symbol's function definition is called; or
   - t, in which case the output is displayed in the echo area.

If PRINTCHARFUN is omitted, the value of `standard-output' (which see)
is used instead.

1. 由于我不熟悉 lisp 的实用方面，我该如何打印到不同的缓冲区？

Answer 1

这是我编写的 Emacs Lisp format 的一个小扩展，其执行类似于 Common Lisp format，但使用 % 作为控件字符:

http://code.google.com/p/formatting-el/source/browse/trunk/formatting.el

因此，例如，如果您想将带有换行符的数字列表打印成字符串，您可以这样做:

(cl-format "%{%s%^\n%}" (cl-loop for i from 0 below 10 collect i))
"0
1
2
3
4
5
6
7
8
9"

实现此目的的另一种方法是使用如下内容:

(mapconcat #'number-to-string (cl-loop for i from 0 below 10 collect i) "\n")
"0
1
2
3
4
5
6
7
8
9"