Add xdg settings, cache, cleanup script

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

users/configs/vscode/default.nix

@@ -1,6 +1,22 @@
-{ user ? throw "user argument is required" }: { pkgs, ... }:
+{ user ? throw "user argument is required" }: { inputs, lib, pkgs, ... }:
 
-{
+let
+  configDir = ".config/Code";
+  cacheDirs = [
+    ".config/Code/Cache"
+    ".config/Code/CachedConfigurations"
+    ".config/Code/CachedData"
+    ".config/Code/CachedExtensionVSIXs"
+    ".config/Code/CachedExtensions"
+    ".config/Code/CachedProfilesData"
+    ".config/Code/Code Cache"
+    ".config/Code/DawnCache"
+    ".config/Code/GPUCache"
+    ".config/Code/Service Worker/CacheStorage"
+    ".config/Code/Service Worker/ScriptCache"
+  ];
+  inherit (pkgs.callPackage "${inputs.impermanence}/lib.nix" { }) sanitizeName concatPaths;
+in {
   home-manager.users."${user.name}" = {
     programs.vscode = {
       enable = true;
@@ -59,6 +75,28 @@
       ./langs/nix.nix
     ];
 
-    home.persistence."/persist${user.home}".directories = [ ".config/Code" ];
+    home.persistence = {
+      "/persist${user.home}".directories = [ configDir ];
+      # Bastard: https://github.com/microsoft/vscode/issues/3884
+      "/cache${user.home}".directories = cacheDirs;
+    };
+
+    # Some filthy fucking shit below, be warned.
+    # Microsoft stores cache under .config/Code instead of .cache/Code like normal people.
+    # Sometimes a race condition is caused if the cache bind mounts are created before the config one.
+    # So we do this. Sorry.
+    # https://github.com/nix-community/impermanence/blob/27979f1c3a0d3b9617a3563e2839114ba7d48d3f/home-manager.nix#L238
+    systemd.user.services = let
+      configDirService = "bindMount-${sanitizeName (lib.strings.escapeShellArg (concatPaths [ "/persist${user.home}" configDir ]))}.service";
+    in
+    builtins.listToAttrs (builtins.map (dir: {
+      name = "bindMount-${sanitizeName (lib.strings.escapeShellArg (concatPaths [ "/cache${user.home}" dir ]))}";
+      value = {
+        Unit = {
+          Requires = [ configDirService ];
+          After = [ configDirService ];
+        };
+      };
+    }) cacheDirs);
   };
 }