XDG MIMETYPES!!!

Another venture of mine that took many hours.

Set the following in home.nix or your home-manager configuration file.

INFO

You don't need to make the .desktop files, they are automatically found by NixOS. Their name wil almost always be the applications command and then append .desktop.

TIP

Looking for a full list of mimetypes? Click here

  xdg = {
    mimeApps = {
      enable = true;
      defaultApplications = {
        "inode/directory" = ["pcmanfm.desktop"]; # Directories
        "text/plain" = ["emacsclient.desktop"]; # Plain text
        "application/vnd.openxmlformats-officedocument.wordprocessingml.document" = ["onlyoffice-desktopeditors.desktop"]; # .docx
        "application/vnd.openxmlformats-officedocument.presentationml.presentation" = ["onlyoffice-desktopeditors.desktop"]; # .pptx
        "application/pdf" = ["onlyoffice-desktopeditors.desktop"]; # .pdf
        "application/zip" = ["xarchiver.desktop"];
        "text/*" = ["emacsclient.desktop"]; # Any text files
        "video/*" = ["mpv.desktop"]; # Any video files
        "x-scheme-handler/https" = ["firefox.desktop"]; # Links
        "x-scheme-handler/http" = ["firefox.desktop"]; # Links
        "x-scheme-handler/mailto" = ["firefox.desktop"]; # Links
        "image/*" = ["feh.desktop"]; # Images
        "image/png" = ["feh.desktop"];
        "image/jpeg" = ["feh.desktop"];
      };
    };
  };