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bug#5102: 23.1; doc-view on a buffer not linked to a file

From: Juri Linkov
Subject: bug#5102: 23.1; doc-view on a buffer not linked to a file
Date: Fri, 04 Dec 2009 23:50:20 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1.50 (x86_64-pc-linux-gnu)

> There is a problem when trying to display postscript code
> in a ps-mode buffer if the buffer is not linked to a file.
> Starting with emacs -Q,
> - open a new buffer,
> - insert in that buffer the content of a postscript file,
> - start ps-mode.
> Now if we type C-c C-c to view the postscript, we are prompted whether
> we want to save the content of the buffer. If we answer "no", we get the error
> Wrong type argument: stringp, nil
> Message buffer reports that this was issued by doc-view-mode.

With `debug-on-error' enabled it displays:

  Debugger entered--Lisp error: (wrong-type-argument stringp nil)
    call-interactively(doc-view-toggle-display nil nil)

Tassilo, please tell whether DocView is designed to work in non-file buffers?

Juri Linkov

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