修改mimeapps.list的配置方式

modules/home/xdg/default.nix

@@ -0,0 +1,51 @@
+# XDG stands for "Cross-Desktop Group", with X used to mean "cross".
+# It's a bunch of specifications from freedesktop.org intended to standardize desktops and
+# other GUI applications on various systems (primarily Unix-like) to be interoperable:
+#   https://www.freedesktop.org/wiki/Specifications/
+{ config, pkgs, ... }: {
+  home.packages = with pkgs; [
+    xdg-utils # provides cli tools such as `xdg-mime` `xdg-open`
+    xdg-user-dirs
+  ];
+
+  xdg = {
+    enable = true;
+    cacheHome = config.home.homeDirectory + "/.cache";
+
+    # manage $XDG_CONFIG_HOME/mimeapps.list
+    # xdg search all desktop entries from $XDG_DATA_DIRS, check it by command:
+    #  echo $XDG_DATA_DIRS
+    # the system-level desktop entries can be list by command:
+    #   ls -l /run/current-system/sw/share/applications/
+    # the user-level desktop entries can be list by command(user ryan):
+    #  ls /etc/profiles/per-user/ryan/share/applications/
+
+    userDirs = {
+      enable = true;
+      createDirectories = false;
+      documents = config.home.homeDirectory + "/doc";
+      music = config.home.homeDirectory + "/doc/music";
+      desktop = config.home.homeDirectory + "/tmp";
+      download = config.home.homeDirectory + "/tmp";
+      videos = config.home.homeDirectory + "/tmp";
+      pictures = config.home.homeDirectory + "/tmp";
+      # templates = config.home.homeDirectory + "/tmp";
+      # publicShare = config.home.homeDirectory + "/tmp";
+      extraConfig = {
+        XDG_SCREENSHOTS_DIR = config.home.homeDirectory + "/tmp/Screenshots";
+      };
+    };
+  };
+
+  # 使用map函数循环 conf 变量，动态的生成 home.file.<user>.config.${i}
+  xdg.configFile = builtins.listToAttrs
+    (builtins.map
+      (name: {
+        inherit name;
+        value = {
+          source = config.home-libs.mkOutOfStoreSymlink "modules/home/xdg/conf/${name}";
+        };
+      })
+      (builtins.attrNames (builtins.readDir ./conf))
+    );
+}