PDF viewer integration

Docfd guesses the default PDF viewer based on the output of xdg-mime query default application/pdf, and invokes the viewer either directly or via flatpak depending on where the desktop file can be first found in the list of directories specified by $XDG_DATA_DIRS.

Docfd opens the file to the first page of the search result and starts a text search of the most unique word of the matched phrase within the same page for the following viewers:

• okular
• evince
• xreader
• atril

Docfd opens the file to the first page of the search result for the following viewers:

• mupdf