fish: functions: Open PDFs in Zathura with fuzzel

Taken from
https://blog.akaisuisei.org/communicating-with-zathura-via-dbus.html

fish/.config/fish/functions/opdf.fish

@@ -0,0 +1,21 @@
+function opdf --description 'Open PDF with fuzzel in existing Zathura'
+    set pdf (fd -H -e pdf "" ~/Study ~/Documents ~/Downloads | fuzzel --dmenu --width 128)
+
+    if test -n "$pdf"
+        set zathuraid (dbus-send --session \
+            --dest=org.freedesktop.DBus \
+            --type=method_call \
+            --print-reply \
+            /org/freedesktop/DBus \
+            org.freedesktop.DBus.ListNames | grep -o 'org.pwmt.zathura.PID-[0-9]*' | fuzzel --dmenu --width 128)
+
+        if test -n "$zathuraid"
+            dbus-send --session \
+                --dest=$zathuraid \
+                --type=method_call \
+                /org/pwmt/zathura \
+                org.pwmt.zathura.ExecuteCommand \
+                string:"open \"$pdf\""
+        end
+    end
+end