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Function `browse-url-mozilla' in browse-url.el

From: Bodo Schulze
Subject: Function `browse-url-mozilla' in browse-url.el
Date: Sat, 09 Aug 2003 21:38:51 +0200

This bug report will be sent to the Free Software Foundation,
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Please write in English, because the Emacs maintainers do not have
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In GNU Emacs 21.2.1 (i386-debian-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2002-03-22 on raven, modified by Debian
configured using `configure  i386-debian-linux-gnu --prefix=/usr 
--sharedstatedir=/var/lib --libexecdir=/usr/lib --localstatedir=/var/lib 
--infodir=/usr/share/info --mandir=/usr/share/man --with-pop=yes --with-x=yes 
--with-x-toolkit=athena --without-gif'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: C
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: de_DE
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

Dear Emacs hackers,

placing point on the string
"file:///usr/local/doc/HOWTO/Text-Terminal-HOWTO-9.html" in a buffer
being in text-mode, I get a "Wrong type argument: stringp, nil" error when 
`browse-url-mozilla'. (I use Mozilla version 1.0.0)

In browse-url.el, I placed an edebug-defun break after the closing
parenthesis of the `append' form in defun `browse-url-mozilla'

         (process (apply 'start-process
                         (concat "mozilla " url) nil
                          (list "-remote")
                          (list "openurl("
                                (if new-window ",new-window")

and get this result in *Messages*

Break Result: ("-remote" 
"openurl(""file:///usr/local/doc/HOWTO/Text-Terminal-HOWTO-9.html" nil ")")
edebug-signal: Wrong type argument: stringp, nil

I guess it's the 'nil' that produces the stringp error.
Also correcting this by adding the empty string in the ELSE branch
of the IF, like this

   (if new-window ",new-window" "")

does not do the job, since the argument passed to the -remote Option
must not be a list, but a string.  Here is a patch that I found
to correct the error.

*** browse-url.el.orig  Sat Aug  9 19:58:27 2003
--- browse-url.el       Sat Aug  9 19:58:27 2003
*** 849,859 ****
!                         (list "-remote")
!                         (list "openurl("
!                               url
!                               (if new-window ",new-window")
!                               ")")))))
      (set-process-sentinel process
                          `(lambda (process change)
                             (browse-url-mozilla-sentinel process ,url)))))
--- 849,863 ----
!                         (list "-remote"
!                               ;; The following should not be a list but a 
!                               ;; so the ELSE-Branch must not be nil but the
!                               ;; empty string
!                               (concat
!                                "openurl(" url
!                                (if new-window ",new-window" "")
!                                ")"))))))
      (set-process-sentinel process
                          `(lambda (process change)
                             (browse-url-mozilla-sentinel process ,url)))))

Hope this may help.

Additional remark:

As of version 1.0.1, 1.1 and beyond, Mozilla also supports the option 'new-tab'.

Mozilla-Help on -remote option

*openURL (/URL/, new-window)*
      Creates a new window displaying the specified document. 

*openURL (/URL/, new-tab)*
          Creates a new tab displaying the specified document.
      /(Available in 1.0.1, 1.1 and beyond)/ 

Emacs just knows the flag `browse-url-new-window-flag'.  Should there
be an additional flag `browse-url-new-tab-flag'?.  

Best regards,
Bodo Schulze

Recent messages:
Loading debug...done
Entering debugger...
 [2 times]
Result: ("-remote" "openurl(" 
"file:///usr/local/doc/HOWTO/Text-Terminal-HOWTO-9.html" nil ")")
edebug-signal: Wrong type argument: stringp, nil
Mark set
Loading emacsbug...done

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