show binary in hexidecimal not octal

show binary in hexidecimal not octal

[Dan Jacobson]

In emacs binary content is shown in octal notation.
There is no way to make it shown in hexidecimal notation.
No I'm not talking about hexl mode or whatever.

Re: show binary in hexidecimal not octal

[Kevin Rodgers]

Dan Jacobson wrote:
> In emacs binary content is shown in octal notation.
> There is no way to make it shown in hexidecimal notation.

Sure there is:

(defvar hex-display-table-prefix "\\")
(defvar hex-display-table-suffix nil)

(defvar hex-display-table
   (let ((table (make-display-table))
	(char ?\x00))
     (while (<= char ?\xFF)
       (unless (equal char ?\n)
	(aset table char (vconcat hex-display-table-prefix
				  (format "%02X" char)
				  hex-display-table-suffix)))
       (setq char (1+ char)))
     table))

(setq buffer-display-table hex-display-table)

> No I'm not talking about hexl mode or whatever.

-- 
Kevin

Re: show binary in hexidecimal not octal

[Dan Jacobson]

Do (compile "perl -e 'for(0..99999){print chr}' 2>&-" nil)

I see ^@^A^B...^Z^[^\^]^^^_ !"#$%&'()*+,-./01...wxyz{|}~^?
\200\201\202\203\204...\374\375\376\377 then Unicode etc.

I am happy with what I see, except that I want the octal shown in hex
instead. I.e. I am only unhappy about \200...\377.

Kevin> (setq buffer-display-table ...

I believe the solution instead lies in a new variable that controls a
deeper down C code item, without the user needing to fiddle with
buffer-display-table nor standard-display-table etc.

No need to target any specific characters, all I am saying is deep
down when emacs feels the urge to send a octal representation to the
screen, it sends instead a hex representation.

I am saying "emacs old buddy, you are doing a perfect job at selecting
what bytes or characters or whatever to send to the screen as (the
four byte) \222, etc. Now just allow the user the choice of how he
wants them shown: hex, octal (current), binary, decimal, etc."

Also there should be a way to paste the e.g., \222 that we see into another
buffer as the four bytes, not one, without having to resort to emacs
-nw and the mouse.

(By the way (compile "perl -e 'for(0..99999){print chr}' 2>&-" nil)
causes error in process filter: font-lock-fontify-keywords-region:
Stack overflow in regexp matcher. Probably for good reason. But that
is not what I'm worried about here.)