Hello, since there is no standard for implementing a file picker in applications, each application uses a different one. If the application has been written in GTK+, it will use the GTK+ file picker, if it has been written in QT it will use QT file picker.
The problem with this approach is that they differ in look, feature set, accessibility and most importantly in the usage. It also contradicts with the UNIX philosophy of modularity. While I can replace almost every part of my operating system, I cannot do that with the file picker. Therefore, I am suggesting a standard for calling a default or a user chosen file picker by a standard command. For example: * Show a file picker with applied filters: * `xdg-filepicker --mime text/plain` or `xdg-filepicker -m text/plain` * `xdg-filepicker --extension *.txt` or `xdg-filepicker -e *.txt` * Allow selecting multiple files: * `xdg-filepicker --multi` These commands would return the list of paths to the chosen files. For example: ``` $ xdg-filepicker --multi # File picker with multi select and no filters applied opens /home/user/Documents/lorem_ipsum.txt # After selecting the files in file picker, /home/user/Documents/photo.jpg # the command returns file list to the standard output ``` I do not know what would be the best approach for setting the file picker. I think that there could alternatively be an environmental variable like `XDG_FILE_PICKER`. There are also a few more things to consider, such as backward compatibility and extensibility. As for extensibility, emacs with GUI shows a hint at the bottom of a GTK file dialog and Libreoffice shows checkbox for opening in read-only mode and choosing file version. Regards, Cezary Drożak
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