zsh: relative path deprecation warning

Warn users when they configure a relative path. We want to encourage
using absolute paths and env variables.

Signed-off-by: Austin Horstman <khaneliman12@gmail.com>

modules/programs/zsh/default.nix

@@ -343,6 +343,24 @@ in
     in
     mkIf cfg.enable (
       lib.mkMerge [
+        {
+          warnings =
+            lib.optionals
+              (cfg.dotDir != homeDir && !lib.hasPrefix "/" cfg.dotDir && !lib.hasPrefix "$" cfg.dotDir)
+              [
+                ''
+                  Using relative paths in programs.zsh.dotDir is deprecated and will be removed in a future release.
+                  Current dotDir: ${cfg.dotDir}
+                  Consider using absolute paths or home-manager config options instead.
+                  You can replace relative paths or environment variables with options like:
+                  - config.home.homeDirectory (user's home directory)
+                  - config.xdg.configHome (XDG config directory)
+                  - config.xdg.dataHome (XDG data directory)
+                  - config.xdg.cacheHome (XDG cache directory)
+                ''
+              ];
+        }
+
         (mkIf (cfg.envExtra != "") {
           home.file."${dotDirRel}/.zshenv".text = cfg.envExtra;
         })

modules/programs/zsh/history.nix

@@ -171,6 +171,21 @@ in
     };
 
   config = {
+    warnings =
+      lib.optionals (!lib.hasPrefix "/" cfg.history.path && !lib.hasInfix "$" cfg.history.path)
+        [
+          ''
+            Using relative paths in programs.zsh.history.path is deprecated and will be removed in a future release.
+            Consider using absolute paths or home-manager config options instead.
+            You can replace relative paths or environment variables with options like:
+            - config.home.homeDirectory (user's home directory)
+            - config.xdg.configHome (XDG config directory)
+            - config.xdg.dataHome (XDG data directory)
+            - config.xdg.cacheHome (XDG cache directory)
+            Current history.path: ${cfg.history.path}
+          ''
+        ];
+
     programs.zsh.initContent = lib.mkMerge [
       (lib.mkOrder 910 ''
         # History options should be set in .zshrc and after oh-my-zsh sourcing.

tests/modules/programs/zsh/dotdir.nix

@@ -35,6 +35,19 @@ in
 
     test.stubs.zsh = { };
 
+    test.asserts.warnings.expected = lib.optionals (case == "relative") [
+      ''
+        Using relative paths in programs.zsh.dotDir is deprecated and will be removed in a future release.
+        Current dotDir: subdir/subdir2
+        Consider using absolute paths or home-manager config options instead.
+        You can replace relative paths or environment variables with options like:
+        - config.home.homeDirectory (user's home directory)
+        - config.xdg.configHome (XDG config directory)
+        - config.xdg.dataHome (XDG data directory)
+        - config.xdg.cacheHome (XDG cache directory)
+      ''
+    ];
+
     nmt.script =
       if case == "xdg-variable" then
         ''

tests/modules/programs/zsh/history-path.nix

@@ -47,6 +47,19 @@ in
 
     test.stubs.zsh = { };
 
+    test.asserts.warnings.expected = lib.optionals (case == "relative") [
+      ''
+        Using relative paths in programs.zsh.history.path is deprecated and will be removed in a future release.
+        Consider using absolute paths or home-manager config options instead.
+        You can replace relative paths or environment variables with options like:
+        - config.home.homeDirectory (user's home directory)
+        - config.xdg.configHome (XDG config directory)
+        - config.xdg.dataHome (XDG data directory)
+        - config.xdg.cacheHome (XDG cache directory)
+        Current history.path: some/subdir/.zsh_history
+      ''
+    ];
+
     nmt.script =
       if case == "xdg-variable" then
         ''