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Recently I am indulging in Emacs. I tried to use it as my LaTeX tool, so I installed pdf-tools. If I add

(pdf-tools-install)

in my init file, it will take about 2 seconds to start Emacs. So I want to write a function such that "pdf-tools-install" will run after I open a pdf file. But "add-hook" only works when a major mode is recognized, and we can recognize pdf only after pdf-tools is installed. I think it may relate to regex, but I don't know much about it. Could you help me with this function? Thanks!

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    Try (add-hook 'doc-view-mode-hook #'pdf-tools-install)
    – politza
    Commented Jan 19, 2017 at 22:58
  • @politza Sadly it does not work, pdf file is still recognized as Fundamental mode.
    – Manan Mehta
    Commented Jan 20, 2017 at 5:02
  • 2
    I suggest either install pdf tools in an idle timer, or autoload it and use an eval-after-load. Or both. (Sorry for not providing code I'm on a mobile device)
    – YoungFrog
    Commented Jan 20, 2017 at 6:42
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    When I hit C-c C-c in my documents it switches between pdfview and Docview so you could see if pdf-tools is initialize when the pdf is opened after applying politza answer.
    – Sparx
    Commented Jan 20, 2017 at 8:46
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    @Manan Mehta But it should be in doc-view-mode.
    – politza
    Commented Jan 20, 2017 at 21:28

1 Answer 1

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Got it to work! Thanks guys!

I added

(add-to-list 'auto-mode-alist '("\\.pdf\\'" . doc-view-mode))

and 

(add-hook 'doc-view-mode-hook #'pdf-tools-install)
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