Rewrite dynamic-colors script in Python

home-manager/modules/dynamic-colors.nix

@@ -1,21 +1,55 @@
 { nixosConfig, lib, pkgs, ... }:
 
 let
-  dynamic-colors = pkgs.writeShellScriptBin "dynamic-colors" /* bash */ ''
-    case "''$1" in
-      light|dark)
-        if [ -e "''$HOME/.config/alacritty/alacritty-''$1.yml" ]; then
-          ln -sf "''$HOME/.config/alacritty/alacritty-''$1.yml" "$HOME/.config/alacritty/alacritty.yml"
-        fi
-      ;;
-      *)
-        echo "unknown command ''$1" >&2
-        exit 1
-    esac
+  dynamic-colors = pkgs.writers.writePython3Bin "dynamic-colors" { } ''
+    import os
+    import pathlib
+    import sys
+
+
+    config = [
+        (
+            '~/.config/alacritty',
+            'alacritty-light.yml',
+            'alacritty-dark.yml',
+            'alacritty.yml',
+        )
+    ]
+
+
+    def main():
+        command, = sys.argv[1:]
+        for directory, light_file, dark_file, config_file in config:
+            directory = pathlib.Path(directory).expanduser()
+            dst = directory.joinpath(config_file)
+
+            if command in ('light', 'dark'):
+                if dst.exists() and dst.is_symlink:
+                    os.remove(dst)
+
+                src = {
+                    'light': light_file,
+                    'dark': dark_file,
+                }[command]
+
+                os.symlink(src, dst)
+
+            else:
+                if dst.exists():
+                    continue
+
+                os.symlink(light_file, dst)
+
+
+    if __name__ == '__main__':
+        main()
   '';
 in
 {
   home.packages = [
     dynamic-colors
   ];
+  home.activation.dynamic-colors = lib.hm.dag.entryAfter [ "writeBoundary" ] ''
+    $DRY_RUN_CMD ${dynamic-colors}/bin/dynamic-colors install
+  '';
 }