default viewer program: calibre doesn't adhere to xdg-mime settings

[schmittlauch]

Hi,

I have the following issue: When double-clicking on a file (this case: PDF), Calibre doesn't respect the desktop-wide "open with" filetype associations:

PDF files are supposed to be opened with "okular" on my system, but are instead opened with "calibre" again which then tries to re-import them.
The "View specific format (Alt+V)" dialogue is also only partially functional:
While "View -> View specific format -> Open PDF with -> Okular" opens the correct program Okular, even a "View -> View specific format" and the double-clicking on the big PDF symbol again triggers the wrong program, in this case calibre.

Can someone point me to the relevant parts of Calibre's code responsible for opening a book after a double-click and the logic behind selecting which program to use for that? I then can try to debug this myself.

I already started with a fresh ~/.config/calibre/, that didn't help either.

I'm running Calibre on Linux, precisely on NixOS. NixOS can be a bit quirky sometimes, so I'm willing to debug this myself if someone can give me a starting point in the code.

Thanks

[davidfor]

What format calibre opens can be configured on the Behavior page of the preferences. Look at the "Use internal view for" list.

[schmittlauch]

Originally Posted by davidfor

What format calibre opens can be configured on the Behavior page of the preferences. Look at the "Use internal view for" list.

Thanks, but that doesn't solve my problem:
The "use internal viewer" checkbox was unticked all the time for PDF. When I wrote that pdf books are opened with calibre I mean that they are opened like with any other external program, just that the external program is calibre itself and not my PDF viewer "Okular".

[kovidgoyal]

calibre uses Qt which in turn uses xdg-open. Fix xdg-open on your system and you will be fine.

[schmittlauch]

Originally Posted by kovidgoyal

calibre uses Qt which in turn uses xdg-open. Fix xdg-open on your system and you will be fine.

`xdg-open book.pdf` does indeed open my PDF viewer, while opening the same file from within calibre still has the issues I described.

@kovidgoyal: As NixOS plays some dirty tricks with enironment variables or paths I don't expect you to devote time for fixing this. But can you please point me to some code and to the Qt methods you call there? This'd really help me investigating this.

PS: as today is the "I love Free Software" day, I want to thank you for that useful piece of software you're working on (=

[kovidgoyal]

https://github.com/kovidgoyal/calibr...nit__.py#L1120