PATCH: num3-mode for highlighting groups of digits in long numbers

PATCH: num3-mode for highlighting groups of digits in long numbers

[Michal Nazarewicz]

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Hello everyone,

This time I bring to you a patch adding num3-mode which helps read long
numbers by alternating highlighting of group of digits in a long
number, so for instance something like:

	12345678.12345678

would be displayed as ("-" symbolising underscore):

	12345678.12345678
	  ---       ---

This also works for hexadecimal numbers by grouping 4-digits at a time,
ie.:

	0x0123456789ABCDEF
	  ----    ----

The face is customisable and can be added to both odd and even groups.

---------- >% ------------------------------------------------------------

=== modified file 'etc/NEWS'
--- etc/NEWS	2012-09-06 09:29:32 +0000
+++ etc/NEWS	2012-09-06 15:48:03 +0000
@@ -539,6 +539,11 @@
 
 \f
 * New Modes and Packages in Emacs 24.3
+
+** num3-mode is a minor mode that highlights groups of digits in a long
+numbers thus so as to make it easier to read.  Enable in current
+buffer via M-x num3-mode RET or globally via M-x global-num3-mode RET.
+
 \f
 * Incompatible Lisp Changes in Emacs 24.3
 

=== modified file 'lisp/ChangeLog'
--- lisp/ChangeLog	2012-09-06 15:35:08 +0000
+++ lisp/ChangeLog	2012-09-06 15:49:32 +0000
@@ -1,3 +1,7 @@
+2012-09-06  Michal Nazarewicz  <mina86@mina86.com>
+
+	* num3.el: New num3-mode minor mode.
+
 2012-09-06  Stefan Monnier  <monnier@iro.umontreal.ca>
 
 	* emacs-lisp/cl-macs.el (cl--do-arglist): Understand _ on &key args

=== added file 'lisp/num3.el'
--- lisp/num3.el	1970-01-01 00:00:00 +0000
+++ lisp/num3.el	2012-09-06 16:09:55 +0000
@@ -0,0 +1,122 @@
+;;; num3-mode.el --- highlight groups of digits in long numbers  -*- lexical-binding: t -*-
+
+;; Copyright (C) 2012 Free Software Foundation, Inc.
+
+;; Author: Felix Lee <felix8a@gmail.com>
+;;         Michal Nazarewicz <mina86@mina86.com>
+;; Keywoards: faces, minor-mode
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Num3 is a minor mode that makes long numbers more readable by
+;; highlighting groups of 3 (customisable) decimal digits or 4 hex
+;; digits when font-lock is on.  Highlighting alternates between two
+;; faces that can be customised.
+
+;;; Usage:
+
+;;     M-x num3-mode           toggle for current buffer.
+;;     M-x global-num3-mode    toggle for all buffers.
+;;
+;; Or add the following to your ~/.emacs file:
+;;     (load "path/to/num3")
+;;     (global-num3-mode)
+
+;;; User variables:
+
+(defgroup num3 nil
+  "Num3 is a minor mode that makes long numbers more readable by
+highlighting groups of 3 decimal digits or 4 hex digits when
+font-lock is on."
+  :group 'text)
+
+(defcustom num3-group-size 3
+  "Number of digits to group in decimal numbers.")
+
+(defcustom num3-threshold 5
+  "Number must be at least that long to start highlighting.")
+
+(defface num3-face-odd
+  '((t))
+  "Face to add for odd groups of digits."
+  :group 'num3)
+
+(defface num3-face-even
+  '((t :underline t :weight bold :background "#eeeeee"))
+  "Face to add for even groups of digits.
+The default face uses redundant signaling, because this is in
+addition to any other font-lock highlighting."
+  :group 'num3)
+
+;;; Implementation:
+
+(require 'font-lock)
+
+;;;###autoload
+(define-minor-mode num3-mode
+  "Toggle num3 minor mode in the current buffer.
+Num3 minor mode makes long numbers more readable by
+highlighting groups of 3 digits when font-lock is on."
+  nil " num3" nil
+  (if num3-mode
+      (unless (assoc '-num3-matcher font-lock-keywords)
+        (font-lock-add-keywords nil '(-num3-matcher) 'append))
+    (font-lock-remove-keywords nil '(-num3-matcher)))
+  (when font-lock-mode
+    (font-lock-fontify-buffer)))
+
+;;;###autoload
+(define-globalized-minor-mode global-num3-mode num3-mode turn-on-num3-mode)
+
+;;;###autoload
+(defun turn-on-num3-mode ()
+  "Turns on `num3-mode' if it's not enabled."
+  (unless num3-mode (num3-mode t)))
+
+(defconst -num3-number-re
+  (concat    "\\(?:0[xX]\\|#\\)\\([0-9a-fA-F]+\\)"  ; 1 = hexadecimal
+          "\\|\\([0-9]+\\)"                         ; 2 = decimal
+          "\\|\\.\\([0-9]+\\)"))                    ; 3 = fraction
+
+(defun -num3-matcher (lim)
+  (save-excursion
+    (while (re-search-forward -num3-number-re lim t)
+      (-num3-int  (match-beginning 1) (match-end 1) 4)
+      (-num3-int  (match-beginning 2) (match-end 2) num3-group-size)
+      (-num3-frac (match-beginning 3) (match-end 3) num3-group-size)))
+  nil)
+
+(defun -num3-int (lo hi n)
+  (when (and lo (>= (- hi lo) num3-threshold))
+    (let (even)
+      (while (< lo hi)
+        (-num3-put even (max lo (- hi n)) hi)
+        (setq hi (- hi n) even (not even))))))
+
+(defun -num3-frac (lo hi n)
+  (when (and lo (>= (- hi lo) num3-threshold))
+    (let (even)
+      (while (< lo hi)
+        (-num3-put even lo (min hi (+ lo n)))
+        (setq lo (+ lo n) even (not even))))))
+
+(defun -num3-put (even lo hi)
+  (font-lock-append-text-property lo hi 'face
+                                  (if even 'num3-face-even 'num3-face-odd)))
+
+(provide 'num3)


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Re: PATCH: num3-mode for highlighting groups of digits in long numbers

[Lars Ingebrigtsen]

Michal Nazarewicz <mpn@google.com> writes:

> This time I bring to you a patch adding num3-mode which helps read long
> numbers by alternating highlighting of group of digits in a long
> number, so for instance something like:
>
> 	12345678.12345678

That's a great idea.  In my day job I deal with awkward big numbers all
the time, and this would be really useful.

-- 
(domestic pets only, the antidote for overdose, milk.)
  http://lars.ingebrigtsen.no  *  Lars Magne Ingebrigtsen

Re: PATCH: num3-mode for highlighting groups of digits in long numbers

[Stefan Monnier]

> This time I bring to you a patch adding num3-mode which helps read long
> numbers by alternating highlighting of group of digits in a long
> number, so for instance something like:

Looks nice, thanks.  Tho I'd rather add it to GNU ELPA than to
Emacs proper.


        Stefan

Re: PATCH: num3-mode for highlighting groups of digits in long numbers

[Michal Nazarewicz]

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(Sorry for late response, I had to look at GNU ELPA but got sucked by
other work in the meantime.)

>> This time I bring to you a patch adding num3-mode which helps read long
>> numbers by alternating highlighting of group of digits in a long
>> number, so for instance something like:

On Thu, Sep 06 2012, Stefan Monnier wrote:
> Looks nice, thanks.  Tho I'd rather add it to GNU ELPA than to
> Emacs proper.

Obviously, I would love to have it in Emacs, especially since it's tiny
and I strongly believe it could benefit everyone by turning it on by
default, but I could settle for a package if no one wants it in
Emacs. ;)

However, I could not figure out how would I go about preparing a package
to go there.  Emacswiki points to a overly-long thread with some
pointers about policy, but no steps to get a package there.

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
ooo +----<email/xmpp: mpn@google.com>--------------ooO--(_)--Ooo--

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Re: PATCH: num3-mode for highlighting groups of digits in long numbers

[Stefan Monnier]

>>> This time I bring to you a patch adding num3-mode which helps read long
>>> numbers by alternating highlighting of group of digits in a long
>>> number, so for instance something like:
>> Looks nice, thanks.  Tho I'd rather add it to GNU ELPA than to
>> Emacs proper.
> Obviously, I would love to have it in Emacs, especially since it's tiny
> and I strongly believe it could benefit everyone by turning it on by
> default, but I could settle for a package if no one wants it in
> Emacs. ;)

I'm moving in the direction of keeping in Emacs only the
"infrastructure" packages and leaving most of the end-user packages in
GNU ELPA.

Note that it doesn't necessarily mean it won't be included in Emacs.
I hope that by Emacs-25, the Emacs tarball will be made up of Emacs
proper plus some bundled ELPA packages so we can freely move packages to
ELPA (e.g. for Gnus and Org).

> However, I could not figure out how would I go about preparing a package
> to go there.  Emacswiki points to a overly-long thread with some
> pointers about policy, but no steps to get a package there.

For single-file packages, you just need to file to be structured
correctly (try C-u M-x checkdoc-current-buffer) and have "Version:"
and "Maintainer:" headers at the beginning.

Also the packages need to have their copyright paperwork in order, just
like code included with Emacs, so we can easily move code between
the two.


        Stefan

Re: PATCH: num3-mode for highlighting groups of digits in long numbers

[Michal Nazarewicz]

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On Wed, Sep 26 2012, Stefan Monnier wrote:
> For single-file packages, you just need to file to be structured
> correctly (try C-u M-x checkdoc-current-buffer) and have "Version:"
> and "Maintainer:" headers at the beginning.

Attached below.

checkdoc-current-buffer gives me two errors but I'm not sure how to fix
those since in given instances num3-mode refers to the mode.

num3.el:102: Disambiguate num3-mode by preceding w/ function,command,variable,option or symbol.
num3.el:111: Disambiguate num3-mode by preceding w/ function,command,variable,option or symbol.

> Also the packages need to have their copyright paperwork in order, just
> like code included with Emacs, so we can easily move code between
> the two.

Everything should be in order on that part.  Google holds the Copyright,
but it has the proper paperwork done (I have contributed previously). 

---------- >% ----------------------------------------------------------

;;; num3-mode.el --- highlight groups of digits in long numbers  -*- lexical-binding: t -*-

;; Copyright (C) 2012 Free Software Foundation, Inc.

;; Author: Felix Lee <felix8a@gmail.com>, Michal Nazarewicz <mina86@mina86.com>
;; Maintainer: Michal Nazarewicz <mina86@mina86.com>
;; Version: 1.0
;; Keywoards: faces, minor-mode

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;; Num3 is a minor mode that makes long numbers more readable by
;; highlighting groups of 3 (customisable) decimal digits or 4 hex
;; digits when font-lock is on.  Highlighting alternates between two
;; faces that can be customised.

;;; Usage:

;;     M-x num3-mode           toggle for current buffer.
;;     M-x global-num3-mode    toggle for all buffers.
;;
;; Or add the following to your ~/.emacs file:
;;     (load "path/to/num3")
;;     (global-num3-mode)

;;; Code:

(defgroup num3 nil
  "Num3 is a minor mode that makes long numbers more readable by
highlighting groups of decimal digits or 4 hex digits when
font-lock is on."
  :group 'text)

(defcustom num3-group-size 3
  "Number of digits to group in decimal numbers.")

(defcustom num3-threshold 5
  "Number must be at least that long to start highlighting.")

(defface num3-face-odd
  '((t))
  "Face to add for odd groups of digits."
  :group 'num3)

(defface num3-face-even
  '((t :underline t :weight bold :background "#eeeeee"))
  "Face to add for even groups of digits.
The default face uses redundant signaling, because this is in
addition to any other font-lock highlighting."
  :group 'num3)

;;; Implementation:

(require 'font-lock)

;;;###autoload
(define-minor-mode num3-mode
  "Toggle num3 minor mode in the current buffer.
Num3 minor mode makes long numbers more readable by highlighting
groups of digits when font-lock mode is on.

If a number is longer than `num3-threshold', the mode will split
it into a group of `num3-group-size' (if number is decimal) or
4 (if number is hexadecimal) digits.  Hexadecimal number is
detected as one starting with 0x, 0X or #.

With decimal numbers, fractions are recognised as well and
grouped from the beginning rathar then from end.  For instance,
with group size of 3, a number \"12345.12345\" will be split into
groups as follows: \"12|345.123|45\".  Fractions without integer
part are also recognised, eg. \".12345\".

The groups are highlighted alternately using `num3-face-odd' and
`num3-face-even' faces.  `num3-face-even' face (which is empty by
default) is the one used for the group closest to the decimal point."
  nil " num3" nil
  (if num3-mode
      (unless (assoc '-num3-matcher font-lock-keywords)
        (font-lock-add-keywords nil '(-num3-matcher) 'append))
    (font-lock-remove-keywords nil '(-num3-matcher)))
  (when font-lock-mode
    (font-lock-fontify-buffer)))

;;;###autoload
(define-globalized-minor-mode global-num3-mode num3-mode turn-on-num3-mode)

;;;###autoload
(defun turn-on-num3-mode ()
  "Turn `num3-mode' on if it's not enabled."
  (unless num3-mode (num3-mode t)))

(defconst -num3-number-re
  (concat    "\\(?:0[xX]\\|#\\)\\([0-9a-fA-F]+\\)"  ; 1 = hexadecimal
          "\\|\\([0-9]+\\)"                         ; 2 = decimal
          "\\|\\.\\([0-9]+\\)"))                    ; 3 = fraction

(defun -num3-matcher (lim)
  "Function used as a font-lock-keywoard handler used in `num3-mode'.
Performs fontification of numbers from point to LIM."
  (save-excursion
    (while (re-search-forward -num3-number-re lim t)
      (-num3-int  (match-beginning 1) (match-end 1) 4)
      (-num3-int  (match-beginning 2) (match-end 2) num3-group-size)
      (-num3-frac (match-beginning 3) (match-end 3) num3-group-size)))
  nil)

(defun -num3-int (lo hi n)
  "Highlight groups of digits in a long number.
LO and HI arguments specify the range where the number is
located.  If the length of that region exceeds `num3-threshold',
the function will split it into groups of N digits and fontify
tham alternately using `num3-face-odd' and `num3-face-even'
faces.  Grouping is done from the end, eg. (12)(345)."
  (when (and lo (>= (- hi lo) num3-threshold))
    (let (even)
      (while (< lo hi)
        (-num3-put even (max lo (- hi n)) hi)
        (setq hi (- hi n) even (not even))))))

(defun -num3-frac (lo hi n)
  "Highlight groups of digits in a long number.
LO and HI arguments specify the range where the number is
located.  If the length of that region exceeds `num3-threshold',
the function will split it into groups of N digits and fontify
tham alternately using `num3-face-odd' and `num3-face-even'
faces.  Grouping is done from the beginning, eg. (123)(45)."
  (when (and lo (>= (- hi lo) num3-threshold))
    (let (even)
      (while (< lo hi)
        (-num3-put even lo (min hi (+ lo n)))
        (setq lo (+ lo n) even (not even))))))

(defun -num3-put (even lo hi)
  "Add font lock text property to highlight a single group of digit.
Use `num3-face-odd' if EVEN is nil and `num3-face-even' if EVEN is
non-nil.  The region the face is set to is from LO to HI."
  (font-lock-append-text-property lo hi 'face
                                  (if even 'num3-face-even 'num3-face-odd)))

(provide 'num3)

;;; num3.el ends here

---------- >% ----------------------------------------------------------

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
ooo +----<email/xmpp: mpn@google.com>--------------ooO--(_)--Ooo--

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Re: PATCH: num3-mode for highlighting groups of digits in long numbers

[Noah Lavine]

I don't usually post, but something confuses me about this patch
(which otherwise looks awesome, by the way):

in the doc string for num3-mode, you say

 `num3-face-even' face (which is empty by
default) is the one used for the group closest to the decimal point.

But looking at the faces, it appears that num3-face-odd is '((t)), and
num3-face-even has lots of attributes. Am I misunderstanding the
documentation, or did you switch the faces?

Thanks for writing this. It looks great.

Noah Lavine

On Wed, Sep 26, 2012 at 8:27 AM, Michal Nazarewicz <mpn@google.com> wrote:
> On Wed, Sep 26 2012, Stefan Monnier wrote:
>> For single-file packages, you just need to file to be structured
>> correctly (try C-u M-x checkdoc-current-buffer) and have "Version:"
>> and "Maintainer:" headers at the beginning.
>
> Attached below.
>
> checkdoc-current-buffer gives me two errors but I'm not sure how to fix
> those since in given instances num3-mode refers to the mode.
>
> num3.el:102: Disambiguate num3-mode by preceding w/ function,command,variable,option or symbol.
> num3.el:111: Disambiguate num3-mode by preceding w/ function,command,variable,option or symbol.
>
>> Also the packages need to have their copyright paperwork in order, just
>> like code included with Emacs, so we can easily move code between
>> the two.
>
> Everything should be in order on that part.  Google holds the Copyright,
> but it has the proper paperwork done (I have contributed previously).
>
> ---------- >% ----------------------------------------------------------
>
> ;;; num3-mode.el --- highlight groups of digits in long numbers  -*- lexical-binding: t -*-
>
> ;; Copyright (C) 2012 Free Software Foundation, Inc.
>
> ;; Author: Felix Lee <felix8a@gmail.com>, Michal Nazarewicz <mina86@mina86.com>
> ;; Maintainer: Michal Nazarewicz <mina86@mina86.com>
> ;; Version: 1.0
> ;; Keywoards: faces, minor-mode
>
> ;; GNU Emacs is free software: you can redistribute it and/or modify
> ;; it under the terms of the GNU General Public License as published by
> ;; the Free Software Foundation, either version 3 of the License, or
> ;; (at your option) any later version.
>
> ;; GNU Emacs is distributed in the hope that it will be useful,
> ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
> ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> ;; GNU General Public License for more details.
>
> ;; You should have received a copy of the GNU General Public License
> ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
>
> ;;; Commentary:
>
> ;; Num3 is a minor mode that makes long numbers more readable by
> ;; highlighting groups of 3 (customisable) decimal digits or 4 hex
> ;; digits when font-lock is on.  Highlighting alternates between two
> ;; faces that can be customised.
>
> ;;; Usage:
>
> ;;     M-x num3-mode           toggle for current buffer.
> ;;     M-x global-num3-mode    toggle for all buffers.
> ;;
> ;; Or add the following to your ~/.emacs file:
> ;;     (load "path/to/num3")
> ;;     (global-num3-mode)
>
> ;;; Code:
>
> (defgroup num3 nil
>   "Num3 is a minor mode that makes long numbers more readable by
> highlighting groups of decimal digits or 4 hex digits when
> font-lock is on."
>   :group 'text)
>
> (defcustom num3-group-size 3
>   "Number of digits to group in decimal numbers.")
>
> (defcustom num3-threshold 5
>   "Number must be at least that long to start highlighting.")
>
> (defface num3-face-odd
>   '((t))
>   "Face to add for odd groups of digits."
>   :group 'num3)
>
> (defface num3-face-even
>   '((t :underline t :weight bold :background "#eeeeee"))
>   "Face to add for even groups of digits.
> The default face uses redundant signaling, because this is in
> addition to any other font-lock highlighting."
>   :group 'num3)
>
> ;;; Implementation:
>
> (require 'font-lock)
>
> ;;;###autoload
> (define-minor-mode num3-mode
>   "Toggle num3 minor mode in the current buffer.
> Num3 minor mode makes long numbers more readable by highlighting
> groups of digits when font-lock mode is on.
>
> If a number is longer than `num3-threshold', the mode will split
> it into a group of `num3-group-size' (if number is decimal) or
> 4 (if number is hexadecimal) digits.  Hexadecimal number is
> detected as one starting with 0x, 0X or #.
>
> With decimal numbers, fractions are recognised as well and
> grouped from the beginning rathar then from end.  For instance,
> with group size of 3, a number \"12345.12345\" will be split into
> groups as follows: \"12|345.123|45\".  Fractions without integer
> part are also recognised, eg. \".12345\".
>
> The groups are highlighted alternately using `num3-face-odd' and
> `num3-face-even' faces.  `num3-face-even' face (which is empty by
> default) is the one used for the group closest to the decimal point."
>   nil " num3" nil
>   (if num3-mode
>       (unless (assoc '-num3-matcher font-lock-keywords)
>         (font-lock-add-keywords nil '(-num3-matcher) 'append))
>     (font-lock-remove-keywords nil '(-num3-matcher)))
>   (when font-lock-mode
>     (font-lock-fontify-buffer)))
>
> ;;;###autoload
> (define-globalized-minor-mode global-num3-mode num3-mode turn-on-num3-mode)
>
> ;;;###autoload
> (defun turn-on-num3-mode ()
>   "Turn `num3-mode' on if it's not enabled."
>   (unless num3-mode (num3-mode t)))
>
> (defconst -num3-number-re
>   (concat    "\\(?:0[xX]\\|#\\)\\([0-9a-fA-F]+\\)"  ; 1 = hexadecimal
>           "\\|\\([0-9]+\\)"                         ; 2 = decimal
>           "\\|\\.\\([0-9]+\\)"))                    ; 3 = fraction
>
> (defun -num3-matcher (lim)
>   "Function used as a font-lock-keywoard handler used in `num3-mode'.
> Performs fontification of numbers from point to LIM."
>   (save-excursion
>     (while (re-search-forward -num3-number-re lim t)
>       (-num3-int  (match-beginning 1) (match-end 1) 4)
>       (-num3-int  (match-beginning 2) (match-end 2) num3-group-size)
>       (-num3-frac (match-beginning 3) (match-end 3) num3-group-size)))
>   nil)
>
> (defun -num3-int (lo hi n)
>   "Highlight groups of digits in a long number.
> LO and HI arguments specify the range where the number is
> located.  If the length of that region exceeds `num3-threshold',
> the function will split it into groups of N digits and fontify
> tham alternately using `num3-face-odd' and `num3-face-even'
> faces.  Grouping is done from the end, eg. (12)(345)."
>   (when (and lo (>= (- hi lo) num3-threshold))
>     (let (even)
>       (while (< lo hi)
>         (-num3-put even (max lo (- hi n)) hi)
>         (setq hi (- hi n) even (not even))))))
>
> (defun -num3-frac (lo hi n)
>   "Highlight groups of digits in a long number.
> LO and HI arguments specify the range where the number is
> located.  If the length of that region exceeds `num3-threshold',
> the function will split it into groups of N digits and fontify
> tham alternately using `num3-face-odd' and `num3-face-even'
> faces.  Grouping is done from the beginning, eg. (123)(45)."
>   (when (and lo (>= (- hi lo) num3-threshold))
>     (let (even)
>       (while (< lo hi)
>         (-num3-put even lo (min hi (+ lo n)))
>         (setq lo (+ lo n) even (not even))))))
>
> (defun -num3-put (even lo hi)
>   "Add font lock text property to highlight a single group of digit.
> Use `num3-face-odd' if EVEN is nil and `num3-face-even' if EVEN is
> non-nil.  The region the face is set to is from LO to HI."
>   (font-lock-append-text-property lo hi 'face
>                                   (if even 'num3-face-even 'num3-face-odd)))
>
> (provide 'num3)
>
> ;;; num3.el ends here
>
> ---------- >% ----------------------------------------------------------
>
> --
> Best regards,                                         _     _
> .o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
> ..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
> ooo +----<email/xmpp: mpn@google.com>--------------ooO--(_)--Ooo--
>
>

Re: PATCH: num3-mode for highlighting groups of digits in long numbers

[Michal Nazarewicz]

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On Wed, Sep 26 2012, Noah Lavine wrote:
> I don't usually post, but something confuses me about this patch
> (which otherwise looks awesome, by the way):
>
> in the doc string for num3-mode, you say
>
>  `num3-face-even' face (which is empty by
> default) is the one used for the group closest to the decimal point.
>
> But looking at the faces, it appears that num3-face-odd is '((t)), and
> num3-face-even has lots of attributes. Am I misunderstanding the
> documentation, or did you switch the faces?

Sorry, you're absolutely right.  It's mistake in documentation in my
part.  Attached is fixed version of the file.

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
ooo +----<email/xmpp: mpn@google.com>--------------ooO--(_)--Ooo--

---------- >% ----------------------------------------------------------

;;; num3-mode.el --- highlight groups of digits in long numbers  -*- lexical-binding: t -*-

;; Copyright (C) 2012 Free Software Foundation, Inc.

;; Author: Felix Lee <felix8a@gmail.com>, Michal Nazarewicz <mina86@mina86.com>
;; Maintainer: Michal Nazarewicz <mina86@mina86.com>
;; Keywoards: faces, minor-mode

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;; Num3 is a minor mode that makes long numbers more readable by
;; highlighting groups of 3 (customisable) decimal digits or 4 hex
;; digits when font-lock is on.  Highlighting alternates between two
;; faces that can be customised.

;;; Usage:

;;     M-x num3-mode           toggle for current buffer.
;;     M-x global-num3-mode    toggle for all buffers.
;;
;; Or add the following to your ~/.emacs file:
;;     (load "path/to/num3")
;;     (global-num3-mode)

;;; Code:

(defgroup num3 nil
  "Num3 is a minor mode that makes long numbers more readable by
highlighting groups of decimal digits or 4 hex digits when
font-lock is on."
  :group 'text)

(defcustom num3-group-size 3
  "Number of digits to group in decimal numbers.")

(defcustom num3-threshold 5
  "Number must be at least that long to start highlighting.")

(defface num3-face-odd
  '((t))
  "Face to add for odd groups of digits."
  :group 'num3)

(defface num3-face-even
  '((t :underline t :weight bold :background "#eeeeee"))
  "Face to add for even groups of digits.
The default face uses redundant signaling, because this is in
addition to any other font-lock highlighting."
  :group 'num3)

;;; Implementation:

(require 'font-lock)

;;;###autoload
(define-minor-mode num3-mode
  "Toggle num3 minor mode in the current buffer.
Num3 minor mode makes long numbers more readable by highlighting
groups of digits when font-lock mode is on.

If a number is longer than `num3-threshold', the mode will split
it into a group of `num3-group-size' (if number is decimal) or
4 (if number is hexadecimal) digits.  Hexadecimal number is
detected as one starting with 0x, 0X or #.

With decimal numbers, fractions are recognised as well and
grouped from the beginning rathar then from end.  For instance,
with group size of 3, a number \"12345.12345\" will be split into
groups as follows: \"12|345.123|45\".  Fractions without integer
part are also recognised, eg. \".12345\".

The groups are highlighted alternately using `num3-face-odd' and
`num3-face-even' faces.  `num3-face-odd' face (which is empty by
default) is the one used for the group closest to the decimal point,
ie. groups are counted starting with one outwards from the (place
where) decimal point (would be) is."
  nil " num3" nil
  (if num3-mode
      (unless (assoc '-num3-matcher font-lock-keywords)
        (font-lock-add-keywords nil '(-num3-matcher) 'append))
    (font-lock-remove-keywords nil '(-num3-matcher)))
  (when font-lock-mode
    (font-lock-fontify-buffer)))

;;;###autoload
(define-globalized-minor-mode global-num3-mode num3-mode turn-on-num3-mode)

;;;###autoload
(defun turn-on-num3-mode ()
  "Turn `num3-mode' on if it's not enabled."
  (unless num3-mode (num3-mode t)))

(defconst -num3-number-re
  (concat    "\\(?:0[xX]\\|#\\)\\([0-9a-fA-F]+\\)"  ; 1 = hexadecimal
          "\\|\\([0-9]+\\)"                         ; 2 = decimal
          "\\|\\.\\([0-9]+\\)"))                    ; 3 = fraction

(defun -num3-matcher (lim)
  "Function used as a font-lock-keywoard handler used in `num3-mode'.
Performs fontification of numbers from point to LIM."
  (save-excursion
    (while (re-search-forward -num3-number-re lim t)
      (-num3-int  (match-beginning 1) (match-end 1) 4)
      (-num3-int  (match-beginning 2) (match-end 2) num3-group-size)
      (-num3-frac (match-beginning 3) (match-end 3) num3-group-size)))
  nil)

(defun -num3-int (lo hi n)
  "Highlight groups of digits in a long number.
LO and HI arguments specify the range where the number is
located.  If the length of that region exceeds `num3-threshold',
the function will split it into groups of N digits and fontify
tham alternately using `num3-face-odd' and `num3-face-even'
faces.  Grouping is done from the end, eg. (12)(345)."
  (when (and lo (>= (- hi lo) num3-threshold))
    (let (even)
      (while (< lo hi)
        (-num3-put even (max lo (- hi n)) hi)
        (setq hi (- hi n) even (not even))))))

(defun -num3-frac (lo hi n)
  "Highlight groups of digits in a long number.
LO and HI arguments specify the range where the number is
located.  If the length of that region exceeds `num3-threshold',
the function will split it into groups of N digits and fontify
tham alternately using `num3-face-odd' and `num3-face-even'
faces.  Grouping is done from the beginning, eg. (123)(45)."
  (when (and lo (>= (- hi lo) num3-threshold))
    (let (even)
      (while (< lo hi)
        (-num3-put even lo (min hi (+ lo n)))
        (setq lo (+ lo n) even (not even))))))

(defun -num3-put (even lo hi)
  "Add font lock text property to highlight a single group of digit.
Use `num3-face-odd' if EVEN is nil and `num3-face-even' if EVEN is
non-nil.  The region the face is set to is from LO to HI."
  (font-lock-append-text-property lo hi 'face
                                  (if even 'num3-face-even 'num3-face-odd)))

(provide 'num3)

;;; num3.el ends here

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Re: PATCH: num3-mode for highlighting groups of digits in long numbers

[Lennart Borgman]

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Just for your information: There is such a mode already in nXhtml. I called
it ocr-users-mode since that I mostly use it for.
On Sep 26, 2012 3:06 PM, "Michal Nazarewicz" <mpn@google.com> wrote:

> On Wed, Sep 26 2012, Noah Lavine wrote:
> > I don't usually post, but something confuses me about this patch
> > (which otherwise looks awesome, by the way):
> >
> > in the doc string for num3-mode, you say
> >
> >  `num3-face-even' face (which is empty by
> > default) is the one used for the group closest to the decimal point.
> >
> > But looking at the faces, it appears that num3-face-odd is '((t)), and
> > num3-face-even has lots of attributes. Am I misunderstanding the
> > documentation, or did you switch the faces?
>
> Sorry, you're absolutely right.  It's mistake in documentation in my
> part.  Attached is fixed version of the file.
>
> --
> Best regards,                                         _     _
> .o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
> ..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
> ooo +----<email/xmpp: mpn@google.com>--------------ooO--(_)--Ooo--
>
> ---------- >% ----------------------------------------------------------
>
> ;;; num3-mode.el --- highlight groups of digits in long numbers  -*-
> lexical-binding: t -*-
>
> ;; Copyright (C) 2012 Free Software Foundation, Inc.
>
> ;; Author: Felix Lee <felix8a@gmail.com>, Michal Nazarewicz <
> mina86@mina86.com>
> ;; Maintainer: Michal Nazarewicz <mina86@mina86.com>
> ;; Keywoards: faces, minor-mode
>
> ;; GNU Emacs is free software: you can redistribute it and/or modify
> ;; it under the terms of the GNU General Public License as published by
> ;; the Free Software Foundation, either version 3 of the License, or
> ;; (at your option) any later version.
>
> ;; GNU Emacs is distributed in the hope that it will be useful,
> ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
> ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> ;; GNU General Public License for more details.
>
> ;; You should have received a copy of the GNU General Public License
> ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
>
> ;;; Commentary:
>
> ;; Num3 is a minor mode that makes long numbers more readable by
> ;; highlighting groups of 3 (customisable) decimal digits or 4 hex
> ;; digits when font-lock is on.  Highlighting alternates between two
> ;; faces that can be customised.
>
> ;;; Usage:
>
> ;;     M-x num3-mode           toggle for current buffer.
> ;;     M-x global-num3-mode    toggle for all buffers.
> ;;
> ;; Or add the following to your ~/.emacs file:
> ;;     (load "path/to/num3")
> ;;     (global-num3-mode)
>
> ;;; Code:
>
> (defgroup num3 nil
>   "Num3 is a minor mode that makes long numbers more readable by
> highlighting groups of decimal digits or 4 hex digits when
> font-lock is on."
>   :group 'text)
>
> (defcustom num3-group-size 3
>   "Number of digits to group in decimal numbers.")
>
> (defcustom num3-threshold 5
>   "Number must be at least that long to start highlighting.")
>
> (defface num3-face-odd
>   '((t))
>   "Face to add for odd groups of digits."
>   :group 'num3)
>
> (defface num3-face-even
>   '((t :underline t :weight bold :background "#eeeeee"))
>   "Face to add for even groups of digits.
> The default face uses redundant signaling, because this is in
> addition to any other font-lock highlighting."
>   :group 'num3)
>
> ;;; Implementation:
>
> (require 'font-lock)
>
> ;;;###autoload
> (define-minor-mode num3-mode
>   "Toggle num3 minor mode in the current buffer.
> Num3 minor mode makes long numbers more readable by highlighting
> groups of digits when font-lock mode is on.
>
> If a number is longer than `num3-threshold', the mode will split
> it into a group of `num3-group-size' (if number is decimal) or
> 4 (if number is hexadecimal) digits.  Hexadecimal number is
> detected as one starting with 0x, 0X or #.
>
> With decimal numbers, fractions are recognised as well and
> grouped from the beginning rathar then from end.  For instance,
> with group size of 3, a number \"12345.12345\" will be split into
> groups as follows: \"12|345.123|45\".  Fractions without integer
> part are also recognised, eg. \".12345\".
>
> The groups are highlighted alternately using `num3-face-odd' and
> `num3-face-even' faces.  `num3-face-odd' face (which is empty by
> default) is the one used for the group closest to the decimal point,
> ie. groups are counted starting with one outwards from the (place
> where) decimal point (would be) is."
>   nil " num3" nil
>   (if num3-mode
>       (unless (assoc '-num3-matcher font-lock-keywords)
>         (font-lock-add-keywords nil '(-num3-matcher) 'append))
>     (font-lock-remove-keywords nil '(-num3-matcher)))
>   (when font-lock-mode
>     (font-lock-fontify-buffer)))
>
> ;;;###autoload
> (define-globalized-minor-mode global-num3-mode num3-mode turn-on-num3-mode)
>
> ;;;###autoload
> (defun turn-on-num3-mode ()
>   "Turn `num3-mode' on if it's not enabled."
>   (unless num3-mode (num3-mode t)))
>
> (defconst -num3-number-re
>   (concat    "\\(?:0[xX]\\|#\\)\\([0-9a-fA-F]+\\)"  ; 1 = hexadecimal
>           "\\|\\([0-9]+\\)"                         ; 2 = decimal
>           "\\|\\.\\([0-9]+\\)"))                    ; 3 = fraction
>
> (defun -num3-matcher (lim)
>   "Function used as a font-lock-keywoard handler used in `num3-mode'.
> Performs fontification of numbers from point to LIM."
>   (save-excursion
>     (while (re-search-forward -num3-number-re lim t)
>       (-num3-int  (match-beginning 1) (match-end 1) 4)
>       (-num3-int  (match-beginning 2) (match-end 2) num3-group-size)
>       (-num3-frac (match-beginning 3) (match-end 3) num3-group-size)))
>   nil)
>
> (defun -num3-int (lo hi n)
>   "Highlight groups of digits in a long number.
> LO and HI arguments specify the range where the number is
> located.  If the length of that region exceeds `num3-threshold',
> the function will split it into groups of N digits and fontify
> tham alternately using `num3-face-odd' and `num3-face-even'
> faces.  Grouping is done from the end, eg. (12)(345)."
>   (when (and lo (>= (- hi lo) num3-threshold))
>     (let (even)
>       (while (< lo hi)
>         (-num3-put even (max lo (- hi n)) hi)
>         (setq hi (- hi n) even (not even))))))
>
> (defun -num3-frac (lo hi n)
>   "Highlight groups of digits in a long number.
> LO and HI arguments specify the range where the number is
> located.  If the length of that region exceeds `num3-threshold',
> the function will split it into groups of N digits and fontify
> tham alternately using `num3-face-odd' and `num3-face-even'
> faces.  Grouping is done from the beginning, eg. (123)(45)."
>   (when (and lo (>= (- hi lo) num3-threshold))
>     (let (even)
>       (while (< lo hi)
>         (-num3-put even lo (min hi (+ lo n)))
>         (setq lo (+ lo n) even (not even))))))
>
> (defun -num3-put (even lo hi)
>   "Add font lock text property to highlight a single group of digit.
> Use `num3-face-odd' if EVEN is nil and `num3-face-even' if EVEN is
> non-nil.  The region the face is set to is from LO to HI."
>   (font-lock-append-text-property lo hi 'face
>                                   (if even 'num3-face-even
> 'num3-face-odd)))
>
> (provide 'num3)
>
> ;;; num3.el ends here
>
>
>

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Re: PATCH: num3-mode for highlighting groups of digits in long numbers

[Stefan Monnier]

> Just for your information: There is such a mode already in nXhtml.

Reminds me: I'm still waiting for your submission of mumamo and nxhtml
for inclusion in GNU ELPA.


        Stefan

Re: PATCH: num3-mode for highlighting groups of digits in long numbers

[Stefan Monnier]

> Sorry, you're absolutely right.  It's mistake in documentation in my
> part.  Attached is fixed version of the file.

Thanks, I just added it to the `elpa' so it should appear in GNU ELPA
next time someone refreshes it.

I made the following changes:
- Added a "Version: 1.0" header.
- Removed the (require 'font-lock) that seemed unnecessary.
- Removed turn-on-num3-mode since (num3-mode) does the same anyway.
  I do see that when num3-mode is already enabled (turn-on-num3-mode) did
  nothing whereas (num3-mode) will call font-lock-fontify-buffer but if
  that's a problem, we should fix num3-mode.

I'm not sure what the "-num-" prefix is meant to be and I'm not fond
of it.  If it's meant for internal functions, then please use
"num--" instead.

> checkdoc-current-buffer gives me two errors but I'm not sure how to fix
> those since in given instances num3-mode refers to the mode.

Don't take checkdoc for the gospel; those "errors" are fine.
If you do want to fix them, do as told: add the word "function" or
"command" soon before the offending `num3-mode'.

If you want to maintain the file directly in the elpa branch (rather
than send us patches), then please ask for write access (by registering
an account on savannah, and asking for membership in the "emacs" group
from that account).

Thank you for your contribution,


        Stefan

Re: PATCH: num3-mode for highlighting groups of digits in long numbers

[Michal Nazarewicz]

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On Wed, Sep 26 2012, Stefan Monnier wrote:
>> Sorry, you're absolutely right.  It's mistake in documentation in my
>> part.  Attached is fixed version of the file.
>
> Thanks, I just added it to the `elpa' so it should appear in GNU ELPA
> next time someone refreshes it.
>
> I made the following changes:
> - Added a "Version: 1.0" header.

Ah, thanks.  I've added the header at one point but must have removed it
by mistake during subsequent edits.

> - Removed the (require 'font-lock) that seemed unnecessary.

Well, num3 does use some font-lock-* functions, but they may be
autoloads or something.

> - Removed turn-on-num3-mode since (num3-mode) does the same anyway.
>   I do see that when num3-mode is already enabled (turn-on-num3-mode) did
>   nothing whereas (num3-mode) will call font-lock-fontify-buffer but if
>   that's a problem, we should fix num3-mode.

Uh?  num3-mode properly toggles number highlighting for me.

> I'm not sure what the "-num-" prefix is meant to be and I'm not fond
> of it.  If it's meant for internal functions, then please use
> "num--" instead.

Will do.

>> checkdoc-current-buffer gives me two errors but I'm not sure how to fix
>> those since in given instances num3-mode refers to the mode.
>
> Don't take checkdoc for the gospel; those "errors" are fine.
> If you do want to fix them, do as told: add the word "function" or
> "command" soon before the offending `num3-mode'.

Yeah, I've decided that in this instance, I'm smarter than 

> If you want to maintain the file directly in the elpa branch (rather
> than send us patches), then please ask for write access (by registering
> an account on savannah, and asking for membership in the "emacs" group
> from that account).

Will do.

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
ooo +----<email/xmpp: mpn@google.com>--------------ooO--(_)--Ooo--

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Re: PATCH: num3-mode for highlighting groups of digits in long numbers

[Stefan Monnier]

> Uh?  num3-mode properly toggles number highlighting for me.

Only if you compile it with Emacs<23 or if you're confusing interactive
calls and Lisp calls (I'm talking about a Lisp call of the form (num3-mode);
M-x num3-mode RET will indeed toggle).


        Stefan

Re: PATCH: num3-mode for highlighting groups of digits in long numbers

[Michal Nazarewicz]

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On Wed, Sep 26 2012, Stefan Monnier wrote:
>> Uh?  num3-mode properly toggles number highlighting for me.
>
> Only if you compile it with Emacs<23 or if you're confusing interactive
> calls and Lisp calls (I'm talking about a Lisp call of the form (num3-mode);
> M-x num3-mode RET will indeed toggle).

Ah, makes sense, I guess.  Thanks.

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
ooo +----<email/xmpp: mpn@google.com>--------------ooO--(_)--Ooo--

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turn-on/off-*MODE* (was: Re: PATCH: num3-mode for highlighting groups of digits in long numbers)

[chad]

On 26 Sep 2012, at 13:01, Stefan Monnier <monnier@iro.umontreal.ca> wrote:

> - Removed turn-on-num3-mode since (num3-mode) does the same anyway.
>  I do see that when num3-mode is already enabled (turn-on-num3-mode) did
>  nothing whereas (num3-mode) will call font-lock-fontify-buffer but if
>  that's a problem, we should fix num3-mode.


Is there a general guideline for when to add or not add these?  I                                                                                                                                                                             
find them generally useful for hooks I've been running with the                                                                                                                                                                               
following small patch to hl-line.el for several months, following                                                                                                                                                                            
the pattern in autofill and flyspell.              

Thanks,
*Chad

*** 155,160 ****
--- 155,174 ----
      (remove-hook 'change-major-mode-hook #'hl-line-unhighlight t)
      (remove-hook 'pre-command-hook #'hl-line-unhighlight t)))
  
+ 
+ ;;;###autoload
+ (defun turn-on-hl-line ()
+   "Unconditionally turn on highlight-line mode."
+   (hl-line-mode 1))
+ 
+ ;;;###autoload
+ (defun turn-off-hl-line ()
+   "Unconditionally turn off highlight-line mode."
+   (hl-line-mode -1))
+ 
+ (custom-add-option 'dired-mode-hook 'turn-on-hl-line)
+ 
+ 
  (defun hl-line-highlight ()
    "Activate the Hl-Line overlay on the current line."
    (if hl-line-mode	; Might be changed outside the mode function.

Re: turn-on/off-*MODE*

[Stefan Monnier]

> Is there a general guideline for when to add or not add these?

Yes: never add them.

> + ;;;###autoload
> + (defun turn-on-hl-line ()
> +   "Unconditionally turn on highlight-line mode."
> +   (hl-line-mode 1))

(hl-line-mode) is the same as (hl-line-mode 1), so you can rewrite is as:

   ;;;###autoload
   (defun turn-on-hl-line ()
     "Unconditionally turn on highlight-line mode."
     (hl-line-mode))
=>

   ;;;###autoload
   (defalias 'turn-on-hl-line #'hl-line-mode
     "Unconditionally turn on highlight-line mode.")

at which point you can decide it's not worth the trouble.

> + ;;;###autoload
> + (defun turn-off-hl-line ()
> +   "Unconditionally turn off highlight-line mode."
> +   (hl-line-mode -1))

I've virtually never seen it used.  So for the very rare cases
(lambda () (foo-mode -1)) works just as well and isn't that much longer
#'turn-off-foo-mode.


        Stefan

Re: PATCH: num3-mode for highlighting groups of digits in long numbers

[felix]

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On Wed, Sep 26, 2012 at 1:01 PM, Stefan Monnier <monnier@iro.umontreal.ca>wrote:

> - Removed turn-on-num3-mode since (num3-mode) does the same anyway.
>   I do see that when num3-mode is already enabled (turn-on-num3-mode) did
>   nothing whereas (num3-mode) will call font-lock-fontify-buffer but if
>   that's a problem, we should fix num3-mode.
>

the turn-on- thing is a convention from emacs 23 and earlier.  yeah, looks
like it should go away, and the logic of calling (num3-mode) from lisp
might need to be fixed


> I'm not sure what the "-num-" prefix is meant to be and I'm not fond
> of it.  If it's meant for internal functions, then please use
> "num--" instead.
>

yeah that's my fault, I've been flipping back and forth between using -pkg-
and pkg--, and at the time I wrote num3 I was using -pkg-, and I prefer
pkg-- now.

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Re: PATCH: num3-mode for highlighting groups of digits in long numbers

[Jambunathan K]

> Hello everyone,
>
> This time I bring to you a patch adding num3-mode which helps read long
> numbers by alternating highlighting of group of digits in a long
> number, so for instance something like:
>
> 	12345678.12345678
>
> would be displayed as ("-" symbolising underscore):
>
> 	12345678.12345678
> 	  ---       ---
>
> This also works for hexadecimal numbers by grouping 4-digits at a time,
> ie.:
>
> 	0x0123456789ABCDEF
> 	  ----    ----

Just curious.

Can we highlight like telephone numbers by creating an *extra* dash,
space or a point.

Tel no: 1234567890 rendered as
Tel no: 12345-67890

In some ways, the highlighting as seen above is in-band and not
out-of-band (as underlines are).  It is also naturally how one would
write down long numbers on a piece of paper for ease of reading.

-- 

Re: PATCH: num3-mode for highlighting groups of digits in long numbers

[felix]

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On Thu, Sep 6, 2012 at 4:18 PM, Jambunathan K <kjambunathan@gmail.com>wrote:

>
> > Hello everyone,
> >
> > This time I bring to you a patch adding num3-mode which helps read long
> > numbers by alternating highlighting of group of digits in a long
> > number, so for instance something like:
> >
> >       12345678.12345678
> >
> > would be displayed as ("-" symbolising underscore):
> >
> >       12345678.12345678
> >         ---       ---
> >
> > This also works for hexadecimal numbers by grouping 4-digits at a time,
> > ie.:
> >
> >       0x0123456789ABCDEF
> >         ----    ----
>
> Just curious.
>
> Can we highlight like telephone numbers by creating an *extra* dash,
> space or a point.
>
> Tel no: 1234567890 rendered as
> Tel no: 12345-67890
>
> In some ways, the highlighting as seen above is in-band and not
> out-of-band (as underlines are).  It is also naturally how one would
> write down long numbers on a piece of paper for ease of reading.
>

That would throw off alignment of things like monospace-formatted tables.
Even if columns in a table are separated with tabs, adding extra chars in
the rendering can mess up the alignment.

One alternative is to tweak interletter spacing so that groups of digits
are bunched together, so that there's a noticeable gap between groups, but
the digits still occupy the same width they normally would. I think this
would be hard to do reliably in current emacs. I don't see any way to
reduce interletter spacing other than using a smaller font, and there
doesn't seem to be a way to compute the pixel width of text either.

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Re: PATCH: num3-mode for highlighting groups of digits in long numbers

[Michal Nazarewicz]

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>> This time I bring to you a patch adding num3-mode which helps read long
>> numbers by alternating highlighting of group of digits in a long
>> number, so for instance something like:
>>
>> 	12345678.12345678
>>
>> would be displayed as ("-" symbolising underscore):
>>
>> 	12345678.12345678
>> 	  ---       ---
>>
>> This also works for hexadecimal numbers by grouping 4-digits at a time,
>> ie.:
>>
>> 	0x0123456789ABCDEF
>> 	  ----    ----

On Fri, Sep 07 2012, Jambunathan K wrote:
> Just curious.
>
> Can we highlight like telephone numbers by creating an *extra* dash,
> space or a point.
>
> Tel no: 1234567890 rendered as
> Tel no: 12345-67890

If you ask whether it is theoretically possible than it is.  nxml-mode
has code to render entities, so the same mechanism can be used to add
dashes to separate numbers.

Still, this is not doable with num3-mode at this point.  Feel free to
hack support for it. :)  It should not be too hard -- just need to add
some defcustom variable and than modify -num3-put defun.

Note that this will work for any kind of *numbers*, so if you want to
treat some specific kind of numbers specially, like phone numbers, than
there will be more coding, probably including a different regex for
phone number detection (BTW. good luck with that, I've spent weeks on
my previous work doing something like that for Mozilla).

In general however, I see more problems with adding extra dashes than
uses.

> In some ways, the highlighting as seen above is in-band and not
> out-of-band (as underlines are).  It is also naturally how one would
> write down long numbers on a piece of paper for ease of reading.

I don't quite get your point here.

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
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