l 2: add mpv.nix (with delete.lua)

lass/2configs/mpv.nix

@@ -0,0 +1,30 @@
+{ pkgs, ... }:
+
+let
+
+  mpv-config = pkgs.writeText "mpv-config" ''
+    script=${deleteCurrentFile}
+  '';
+  mpv = pkgs.writeDashBin "mpv" ''
+    exec ${pkgs.mpv}/bin/mpv --no-config --include=${mpv-config} $@
+  '';
+
+  deleteCurrentFile = pkgs.writeText "delete.lua" ''
+    deleted_tmp = "./.graveyard"
+
+    -- Delete the current track by moving it to the `deleted_tmp` location.
+    function delete_current_track()
+      track = mp.get_property("path")
+      os.execute("mkdir -p '" .. deleted_tmp .. "'")
+      os.execute("mv '" .. track .. "' '" .. deleted_tmp .. "'")
+      print("'" .. track .. "' deleted.")
+    end
+
+    mp.add_key_binding("D", "delete_current_track", delete_current_track)
+  '';
+
+in {
+  krebs.per-user.lass.packages = [
+    mpv
+  ];
+}