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bug#8283: sgml-xml-auto-coding-function() should respect the *-with-sign

From: LIN Sumang
Subject: bug#8283: sgml-xml-auto-coding-function() should respect the *-with-signature-* coding
Date: Fri, 18 Mar 2011 15:10:18 +0800

I wrote a simple function for workaround. Hope it helps.

(defun sgml-xml-auto-coding-function-utf (size)
  (let* ((selected-coding (sgml-xml-auto-coding-function size))
         (selected (symbol-name selected-coding))
         (current-coding buffer-file-coding-system)
         (current (symbol-name current-coding))
    (if (and (string-match "^utf-" selected)
             (string-match "^utf-.+\\(-with-signature.*\\)" current))
        (if (string= selected (substring current 0 (length selected)))
          ;; current=utf-cc-xxxx; selected=utf-ss; new -> utf-ss-xxxx
          (let ((sig (match-string 1 current))
            (string-match "^utf-\\(.+\\)" selected)
            (setq new (match-string 1 selected))
            (setq new (intern (concat "utf-" new sig)))
            (if (coding-system-p new)

On Fri, Mar 18, 2011 at 1:56 PM, LIN Sumang <address@hidden> wrote:

I am using Emacs 23.2.1. I think sgml-xml-auto-coding-function() should respect the *-with-signature-* coding.

Consider the scenario below:
1. xml file with the signature \376\377 at beginning of the file and the first line is
<?xml version="1.0" encoding="utf-16be"?>
2. edit this file and save it. sgml-xml-auto-coding-function will use the utf-16be to save the file.
3. open the file again, get messed.

In this case sgml-xml-auto-coding-function() shouldn't change the coding and if it really need to change the coding, it should append the *-with-signature-* to the selected coding.

sgml-html-meta-auto-coding-function() should have same problem.

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