2010-03-30 Martin Stjernholm <mast@lysator.liu.se>

 * mm-decode.el (mm-add-meta-html-tag): Added option to override the
 charset.
 * gnus-art.el (gnus-article-browse-html-parts): Force the correct
 charset into the <meta> tag when the article is encoded to utf-8.

3 files changed, 20 insertions, 8 deletions

diff --git a/lisp/gnus/ChangeLog b/lisp/gnus/ChangeLog
index 5fddceec0fb..66a358af534 100644
--- a/lisp/gnus/ChangeLog
+++ b/lisp/gnus/ChangeLog
@@ -1,3 +1,11 @@
+2010-03-30  Martin Stjernholm  <mast@lysator.liu.se>
+
+        * mm-decode.el (mm-add-meta-html-tag): Added option to override the
+        charset.
+
+        * gnus-art.el (gnus-article-browse-html-parts): Force the correct
+        charset into the <meta> tag when the article is encoded to utf-8.
+
 2010-03-30  Katsumi Yamaoka  <yamaoka@jpl.org>
 
         * gnus-art.el (gnus-article-browse-delete-temp-files): Delete
diff --git a/lisp/gnus/gnus-art.el b/lisp/gnus/gnus-art.el
index 9288101759f..086eb47d76c 100644
--- a/lisp/gnus/gnus-art.el
+++ b/lisp/gnus/gnus-art.el
@@ -2893,7 +2893,8 @@ message header will be added to the bodies of the \"text/html\" parts."
              ;; Add a meta html tag to specify charset and a header.
              (cond
               (header
-               (let (title eheader body hcharset coding cid-image-dir)
+               (let (title eheader body hcharset coding force-charset
+                           cid-image-dir)
                  (with-temp-buffer
                    (mm-enable-multibyte)
                    (setq case-fold-search t)
@@ -2917,7 +2918,8 @@ message header will be added to the bodies of the \"text/html\" parts."
                              title (when title
                                      (mm-encode-coding-string title charset))
                              body (mm-encode-coding-string (mm-get-part handle)
-                                                           charset))
+                                                           charset)
+                             force-charset t)
                      (setq hcharset (mm-find-mime-charset-region (point-min)
                                                                  (point-max)))
                      (cond ((= (length hcharset) 1)
@@ -2948,7 +2950,8 @@ message header will be added to the bodies of the \"text/html\" parts."
                                        body (mm-encode-coding-string
                                              (mm-decode-coding-string
                                               (mm-get-part handle) body)
-                                             charset))))
+                                             charset)
+                                       force-charset t)))
                            (setq charset hcharset
                                  eheader (mm-encode-coding-string
                                           (buffer-string) coding)
@@ -2962,7 +2965,7 @@ message header will be added to the bodies of the \"text/html\" parts."
                    (mm-disable-multibyte)
                    (insert body)
                    (when charset
-                     (mm-add-meta-html-tag handle charset))
+                     (mm-add-meta-html-tag handle charset force-charset))
                    (when title
                      (goto-char (point-min))
                      (unless (search-forward "<title>" nil t)
diff --git a/lisp/gnus/mm-decode.el b/lisp/gnus/mm-decode.el
index 58ba3ec7413..171afac31ff 100644
--- a/lisp/gnus/mm-decode.el
+++ b/lisp/gnus/mm-decode.el
@@ -1258,11 +1258,11 @@ PROMPT overrides the default one used to ask user for a file name."
            (mm-save-part-to-file handle file)
            file))))
 
-(defun mm-add-meta-html-tag (handle &optional charset)
+(defun mm-add-meta-html-tag (handle &optional charset force-charset)
   "Add meta html tag to specify CHARSET of HANDLE in the current buffer.
 CHARSET defaults to the one HANDLE specifies.  Existing meta tag that
-specifies charset will not be modified.  Return t if meta tag is added
-or replaced."
+specifies charset will not be modified unless FORCE-CHARSET is non-nil.
+Return t if meta tag is added or replaced."
   (when (equal (mm-handle-media-type handle) "text/html")
     (when (or charset
               (setq charset (mail-content-type-get (mm-handle-type handle)
@@ -1274,7 +1274,8 @@ or replaced."
         (if (re-search-forward "\
 <meta\\s-+http-equiv=[\"']?content-type[\"']?\\s-+content=[\"']\
 text/\\(\\sw+\\)\\(?:\;\\s-*charset=\\(.+\\)\\)?[\"'][^>]*>" nil t)
-            (if (and (match-beginning 2)
+            (if (and (not force-charset)
+                     (match-beginning 2)
                      (string-match "\\`html\\'" (match-string 1)))
                 ;; Don't modify existing meta tag.
                 nil