Re: Setting the modeline per (type of) buffer

[Decebal <CLDWesterhof@gmail.com>]

On 17 jan, 12:39, Decebal <CLDWester...@gmail.com> wrote:
> I made something to display the lines, words and characters in the
> modeline with filling global-mode-string. But what if I wanted to
> displat different things in different modes/buffers? For example,
> maybe it would be handy to have the number of functions in my C-code.
> But that is of no use in a normal text-file.

I found the first part. I made the following code:

(defvar buffer-count-chars
  nil
  "*Number of chars in the buffer."
  )

(defvar buffer-count-lines
  nil
  "*Number of lines in the buffer."
  )

(defvar buffer-count-words
  nil
  "*Number of words in the buffer."
  )

(defvar buffer-mode-line
  nil
  "*Extension of modeline in the buffer."
  )

(defun buffer-count(expression)
  (how-many expression (point-min) (point-max))
  )

(defun buffer-default-mode-line()
  (setq buffer-count-lines
	(number-to-string
	 (+ (buffer-count "\n") 1)
	)

	buffer-count-words
	(number-to-string (buffer-count "\\w+"))

	buffer-count-chars
	(number-to-string (buffer-count ".\\|\n"))
	)
  (concat "Lines: " buffer-count-lines
	  " Words: " buffer-count-words
	  " Chars: " buffer-count-chars
	  " "
	  )
  )

(defun buffer-update-mode-line()
  (setq buffer-mode-line (buffer-default-mode-line))
  (force-mode-line-update)
  )

(unless buffer-mode-line
  (run-with-idle-timer 1 t 'buffer-update-mode-line)
  (buffer-update-mode-line)
  )

(unless (memq 'buffer-mode-line global-mode-string)
  (setq global-mode-string
	(append global-mode-string
		'(" " buffer-mode-line)
		)
	)
  )


In the function buffer-update-mode-line I could do things depending on
the mode.
One things puzzles me. In the setq global-mode-string I need the "
" (first parameter of the append), otherwise I get an invalid in my
modeline. Because of this the first displayed text needs not have a
space before it (otherwise it would get two). Why is this?

Is this a good way to do this, or is there a better way?