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Re: evaluating numbers

From: Robert Pluim
Subject: Re: evaluating numbers
Date: Wed, 20 Nov 2019 14:00:16 +0100

>>>>> On Mon, 18 Nov 2019 19:05:37 +0200, Eli Zaretskii <address@hidden> said:

    >> From: Robert Pluim <address@hidden>
    >> Cc: address@hidden,  address@hidden,
    >> address@hidden,  address@hidden,  address@hidden
    >> Date: Mon, 18 Nov 2019 17:54:18 +0100
    >> Char: i (105, #o151, #x69, (LATIN SMALL LETTER I)) point=55242 of 379127 
(15%) column=43
    >> That seems ... suboptimal to me (at least, I donʼt like it).

    Eli> Fine, then let's go with just the name.

Latest version attached, which produces output like so:

Char: i (105, #o151, #x69, LATIN SMALL LETTER I) point=1482 of 1715 (86%) 
<860-1716> column=13

Iʼll push this weekend if everyone's ok with it.


>From 8f8a3888439d959cff60a0cdea2070b1d3ebc15d Mon Sep 17 00:00:00 2001
From: Robert Pluim <address@hidden>
Date: Tue, 19 Nov 2019 11:33:10 +0100
Subject: [PATCH] Have what-cursor-position optionally show character name
To: address@hidden

* lisp/simple.el (what-cursor-show-names): New defcustom, default nil.
(what-cursor-position): Show character names if what-cursor-show-names
is non-nil.

* doc/emacs/basic.texi (Position Info): Add what-cursor-show-names

* etc/NEWS: Announce what-cursor-show-names.
 doc/emacs/basic.texi | 10 ++++++++++
 etc/NEWS             |  5 +++++
 lisp/simple.el       | 31 ++++++++++++++++++++++---------
 3 files changed, 37 insertions(+), 9 deletions(-)

diff --git a/doc/emacs/basic.texi b/doc/emacs/basic.texi
index d0bd46c35f..79a546f9e7 100644
--- a/doc/emacs/basic.texi
+++ b/doc/emacs/basic.texi
@@ -696,6 +696,16 @@ Position Info
 horizontal position of point, in columns counting from the left edge
 of the window.
+@vindex what-cursor-show-names
+  If the user option @code{what-cursor-show-names} is non-@code{nil},
+the name of the character is shown as well, so the part in parentheses
+would become:
+(99, #o143, #x63, LATIN SMALL LETTER C)
+@end smallexample
   If the buffer has been narrowed, making some of the text at the
 beginning and the end temporarily inaccessible, @kbd{C-x =} displays
 additional text describing the currently accessible range.  For
diff --git a/etc/NEWS b/etc/NEWS
index 4887b8e681..fdfe2d8692 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -231,6 +231,11 @@ To get the old, less-secure behavior, you can set the
 *** When run by root, emacsclient no longer connects to non-root sockets.
 (Instead you can use Tramp methods to run root commands in a non-root Emacs.)
+** New user option 'what-cursor-show-names'.
+When non-nil, what-cursor-position will show the name of the character
+in addition to the decimal/hex/octal representation. Default nil.
 ** New function 'network-lookup-address-info'.
 This does IPv4 and/or IPv6 address lookups on hostnames.
diff --git a/lisp/simple.el b/lisp/simple.el
index c61ccd511c..a63f2552df 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -1389,10 +1389,17 @@ line-number-at-pos
         (forward-line 0)
         (1+ (count-lines start (point)))))))
+(defcustom what-cursor-show-names nil
+  "Whether to show character names in `what-cursor-position'."
+  :type 'boolean
+  :version "27.1"
+  :group 'editing-basics)
 (defun what-cursor-position (&optional detail)
   "Print info on cursor position (on screen and within buffer).
-Also describe the character after point, and give its character code
-in octal, decimal and hex.
+Also describe the character after point, and give its character
+code in octal, decimal and hex, plus its name if
+`what-cursor-show-names' is non-nil.
 For a non-ASCII multibyte character, also give its encoding in the
 buffer's selected coding system if the coding system encodes the
@@ -1404,6 +1411,12 @@ what-cursor-position
 in *Help* buffer.  See also the command `describe-char'."
   (interactive "P")
   (let* ((char (following-char))
+         (char-name (and what-cursor-show-names
+                         (or (get-char-code-property char 'name)
+                             (get-char-code-property char 'old-name))))
+         (char-name-fmt (if char-name
+                            (format ", %s" char-name)
+                          ""))
          ;; If the character is one of LRE, LRO, RLE, RLO, it will
          ;; start a directional embedding, which could completely
@@ -1449,7 +1462,7 @@ what-cursor-position
            (setq coding (default-value 'buffer-file-coding-system)))
        (if (eq (char-charset char) 'eight-bit)
            (setq encoding-msg
-                 (format "(%d, #o%o, #x%x, raw-byte)" char char char))
+                 (format "(%d, #o%o, #x%x%s, raw-byte)" char char char 
          ;; Check if the character is displayed with some `display'
          ;; text property.  In that case, set under-display to the
          ;; buffer substring covered by that property.
@@ -1468,17 +1481,17 @@ what-cursor-position
          (setq encoding-msg
                (if display-prop
                    (if (not (stringp display-prop))
-                       (format "(%d, #o%o, #x%x, part of display \"%s\")"
-                               char char char under-display)
-                     (format "(%d, #o%o, #x%x, part of display \"%s\"->\"%s\")"
-                             char char char under-display display-prop))
+                       (format "(%d, #o%o, #x%x%s, part of display \"%s\")"
+                               char char char char-name-fmt under-display)
+                     (format "(%d, #o%o, #x%x%s, part of display 
+                             char char char char-name-fmt under-display 
                  (if encoded
-                     (format "(%d, #o%o, #x%x, file %s)"
+                     (format "(%d, #o%o, #x%x%s, file %s)"
                              char char char
                              (if (> (length encoded) 1)
                                (encoded-string-description encoded coding)))
-                   (format "(%d, #o%o, #x%x)" char char char)))))
+                   (format "(%d, #o%o, #x%x%s)" char char char 
        (if detail
            ;; We show the detailed information about CHAR.
            (describe-char (point)))

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