zsh: Add dirHashes option

modules/programs/zsh.nix

@@ -22,6 +22,10 @@ let
     mapAttrsToList (k: v: "alias -g ${k}=${lib.escapeShellArg v}") cfg.shellGlobalAliases
   );
 
+  dirHashesStr = concatStringsSep "\n" (
+    mapAttrsToList (k: v: ''hash -d ${k}="${v}"'') cfg.dirHashes
+  );
+
   zdotdir = "$HOME/" + cfg.dotDir;
 
   bindkeyCommands = {
@@ -234,6 +238,21 @@ in
         type = types.attrsOf types.str;
       };
 
+      dirHashes = mkOption {
+        default = {};
+        example = literalExample ''
+          {
+            docs  = "$HOME/Documents";
+            vids  = "$HOME/Videos";
+            dl    = "$HOME/Downloads";
+          }
+        '';
+        description = ''
+          An attribute set that adds to named directory hash table.
+        '';
+        type = types.attrsOf types.str;
+      };
+
       enableCompletion = mkOption {
         default = true;
         description = ''
@@ -488,6 +507,9 @@ in
 
         # Global Aliases
         ${globalAliasesStr}
+
+        # Named Directory Hashes
+        ${dirHashesStr}
       '';
     }