refactor: reorganize theme manager, allow set default theme + default virtual keyboard layout via envar

README.md

@@ -1,3 +1,18 @@
 # diya-shell
 
-Wayland shell for diyac wayland compositor
+Wayland shell for diyac wayland compositor
+
+# Environment variables
+
+## Theme
+
+Default theme can be set using the envar `DIYA_DEFAULT_THEME`, this will cause the shell searching for CSS file theme in
+`/home/$USER/.config/diya/themes/`:
+
+* diya-shell: will looking for file: `dev.iohub.diya.session-shell.css`
+* diya-login-shell: will looking for file: `dev.iohub.diya.login-shell.css`
+
+# Virtual keyboard layout
+
+Default virtual keyboard keymap can be set via the `DIYA_VKB_KEYMAP` environment variable. When created virtual keyboard,
+the shell will search for keymap file in: `/home/$USER/.config/diya/xkb/${DIYA_VKB_KEYMAP}.keymap`