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Language Emacs LISP
(Example using buffers and documentation)
| Date: | 09/11/07 |
| Author: | Neil Roberts |
| URL: | http://www.busydoingnothing.co.uk/ |
| Comments: | 1 |
| Info: | http://www.gnu.org/software/emacs/ |
| Score: |  (3.00 in 10 votes) |
(defun beer-text (num &optional capitalise)
"Returns a phrase for the given number of bottles of beer.
The phrase is colour-coded red if there are no bottles left or
blue otherwise. If the optional argument CAPITALISE is non-nil,
the first letter of the phrase is capitalised."
(propertize (cond ((= num 0) (concat (if capitalise "N" "n")
"o more bottles of beer"))
((= num 1) "1 bottle of beer")
(t (format "%i bottles of beer" num)))
'face (list :foreground (if (equal num 0) "red" "blue"))))
(defun beer-verse (num)
"Returns a complete verse for the given number of bottles."
(concat (beer-text num t) " on the wall, "
(beer-text num) ".\n"
(if (equal num 0)
(concat "Go to the store and buy some more, "
(beer-text 99) " on the wall.\n")
(concat "Take one down and pass it around, "
(beer-text (1- num)) " on the wall.\n"))))
(defun beer-song-insert (start)
"Inserts the complete 99 bottles of beer song into the buffer."
(let ((n start))
(while (>= n 0)
(insert (beer-verse n))
(when (>= (setq n (1- n)) 0)
(insert "\n")))))
(defun beer-song (start)
"Show the 99 bottles of beer song.
The song is created in a buffer called *Beer song* and the buffer
is displayed. If a prefix is given, the song is started from that
number of bottles, otherwise it starts from 99."
(interactive "P")
(let ((buf (get-buffer-create "*Beer song*")))
(with-current-buffer buf
(kill-all-local-variables)
(erase-buffer)
(beer-song-insert (if start (prefix-numeric-value start) 99))
(goto-char (point-min)))
(view-buffer buf)))
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