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fixing url-unhex-string for unicode/multi-byte charsets
From: |
Boruch Baum |
Subject: |
fixing url-unhex-string for unicode/multi-byte charsets |
Date: |
Fri, 6 Nov 2020 02:47:42 -0500 |
User-agent: |
NeoMutt/20180716 |
In the thread "Friendlier dired experience", Michael Albinus noted that
the new emacs feature to place remote files in the local trash performs
hex-encoding on remote file-names as if they were URLs, which led me to
discover that was also happening for local files encoded in multi-byte
(eg. unicode) character-set encodings. Neither of these cases were being
properly handled by the current emacs function `url-unhex-string'. We
noticed this for the case of restoring a trashed file, but it can be
expected to exhibit in other cases.
I've solved the problem for diredc, using code from the emacs-w3m
project (thanks). Whether for the general emacs case it should be
handled by altering function `url-unhex-string', or whether a second
function should be created isn't for me to decide, so here's my fix for
you to discuss, decide, apply.
--8<--cut here-(start)------------------------------------------- >8
(defun diredc--decode-hexlated-string (str)
"Convert hexlated string to human-readable, with charset coding support.
This function improves upon `url-unhex-string' by handled
hexlated multi-byte and unicode characters. Credit to the
`emacs-w3m' project for the core-code, at
`w3m-url-decode-string'."
;; NOTE: This technique should be used by `url-unhex-string' itself,
;; or integrated otherwise into emacs.
(let ((start 0)
(case-fold-search t)
(regexp "%\\(?:\\([0-9a-f][0-9a-f]\\)\\|0d%0a\\)"))
(with-temp-buffer
(set-buffer-multibyte nil)
(while (string-match regexp str start)
(insert (substring str start (match-beginning 0))
(if (match-beginning 1)
(string-to-number (match-string 1 str) 16)
?\n))
(setq start (match-end 0)))
(insert (substring str start))
(decode-coding-string
(buffer-string)
(with-coding-priority nil
(car (detect-coding-region (point-min) (point-max))))))))
--8<--cut here-(end)--------------------------------------------- >8
--
hkp://keys.gnupg.net
CA45 09B5 5351 7C11 A9D1 7286 0036 9E45 1595 8BC0
- fixing url-unhex-string for unicode/multi-byte charsets,
Boruch Baum <=
- Re: fixing url-unhex-string for unicode/multi-byte charsets, Eli Zaretskii, 2020/11/06
- Re: fixing url-unhex-string for unicode/multi-byte charsets, Boruch Baum, 2020/11/06
- Re: fixing url-unhex-string for unicode/multi-byte charsets, Eli Zaretskii, 2020/11/06
- Re: fixing url-unhex-string for unicode/multi-byte charsets, Boruch Baum, 2020/11/06
- Re: fixing url-unhex-string for unicode/multi-byte charsets, Eli Zaretskii, 2020/11/06
- Re: fixing url-unhex-string for unicode/multi-byte charsets, Stefan Monnier, 2020/11/06
- Re: fixing url-unhex-string for unicode/multi-byte charsets, Eli Zaretskii, 2020/11/06
- Re: fixing url-unhex-string for unicode/multi-byte charsets, Boruch Baum, 2020/11/08
- Re: fixing url-unhex-string for unicode/multi-byte charsets, Stefan Monnier, 2020/11/08
- Re: fixing url-unhex-string for unicode/multi-byte charsets, Eli Zaretskii, 2020/11/08