Hyperbole can easily handle the pdf issue without Org, as I will explain
tonight when time allows. — Bob
-- Bob
> On May 12, 2021, at 11:03 AM, Jean Louis <bugs@gnu.support> wrote:
>
> * Dr. Erich Ruff <dr.erich.r...@t-online.de> [2021-05-12 10:09]:
>> Dear Jean,
>>
>> thank you very much for your explanation in the other mails. I'm only a
>> hobby-programmer and new to elisp.
>>
>> 1) What with hyperbolahv-web-search-alist
>
> Standard way would be to customize the variable by using Emacs
> customize interface:
>
> {M-x customize-variable RET hyperbole-web-search-alist RET}
>
> I suggest doing that.
>
> There is no need for pushing, or making new file or entering it
> manually into init.el
>
>> If "Leo" gets added via my .emacs it is not shown in the menu. If its a
>> bug, pls could you fix it? - with my elisp-knowledge I can't do it.
>
> I have used this:
> {M-x customize-variable RET hyperbole-web-search-alist RET}
>
> and it works.
>
>> 2) I use a lot of books written before 1900 in the classic
>> fontfamily: fraktur, so a search in the book is not possible.
>
> I understand. But let us say not possible yet. Tesseract is one of
> good OCR systems that recognize text and transform it into digital
> text. I would say then:
>
> - learn how to use tesseract, it does work well;
>
> - apply Fraktur data files:
> https://github.com/paalberti/tesseract-dan-fraktur which can be part
> of your distribution. On my Parabola GNU/Linux-libre it is already
> part of the operating system
>
> - convert into text by using Tesseract and Fraktur fonts
>
> It is good to mention that Org has its specialized mailing list where
> you can find vibrant, helpful people.
>
>> Is it possible - like in org-mode - to create an explict button,
>> which will open the pdf in emacs (pdf-tools) at a given page-nr?
>
> I would say, if you wish those links to be part of Org file, then keep
> it Org file. Org supports any kinds of hyperlinks, including
> customized hyperlinks.
>
> One solution from Emacs Wiki:
>
> (delete '("\\.pdf\\'" . default) org-file-apps)
> (add-to-list 'org-file-apps '("\\.pdf::\\([0-9]+\\)\\'" . "evince \"%s\" -p
> %1"))
>
> then you can make links like:
>
> [[~/test.pdf::3]]
>
>
> But I assure you that Emacs alone can open specific PDF page as well, so
> command is following:
>
> (delete '("\\.pdf\\'" . default) org-file-apps)
> (add-to-list 'org-file-apps '("\\.pdf::\\([0-9]+\\)\\'" . (lambda (file link)
> (my-find-file-pdf file link))))
>
> (defun my-find-file-pdf (file link)
> (when (string-match "[\\.pdf|::[:digit:]]$" link)
> (let* ((extension (file-name-extension link))
> (page (string-match "::" extension))
> (page (when page (substring extension (+ 2 (string-match "::"
> extension))))))
> (find-file file)
> (when page
> (doc-view-goto-page (string-to-number page))))))
>
> Then you make the link like:
>
> [[file:~/6957894.pdf::1][something]]
>
> and that one will open in Emacs.
>
> If you wish to use external applications on GNU/Linux or
> BSD-derivative operating systems, you could study commands below
> to figure out how to use various external programs.
>
> For example:
>
> evince --page-index=PAGE
> xpdf :PAGE file
> okular -p PAGE
>
> It would be also possible to define one function for PDF opening
> where you can change the program without changing your Org PDF
> settings.
>
> --
> Jean
>
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>
