Added initial tree

gnome-flavour-selector.desktop

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+[Desktop Entry]
+Name=Choose Desktop
+GenericName=Choose Desktop Design
+Exec=/usr/bin/gnome-flavour-selector
+Terminal=false
+Icon=org.gnome.tweaks.svg
+Categories=GNOME;GTK;System;
+Type=Application
+StartupNotify=false
+X-GNOME-Autostart-enabled=true
+X-GNOME-Autostart-Delay=10

gnome-flavour-selector.sh

@@ -0,0 +1,102 @@
+#!/bin/sh
+
+LOCK_FILE="$HOME/.config/gnome-flavour-selector/timestamp"
+EXTENSIONS_SWITCHER="/usr/share/gnome-flavour-selector/extensions.json"
+
+mkdir -p $HOME/.config/gnome-flavour-selector
+
+if [ -f "$LOCK_FILE" -a -f "$EXTENSIONS_SWITCHER" ]; then
+	_timestamps="$(cat $EXTENSIONS_SWITCHER | jq -r '. | keys | .[]')"
+	_lastrun_timestamps="$(cat $LOCK_FILE )"
+
+	for ts in $_timestamps; do
+    	if [ $(echo $ts | sed 's@^T@@') -gt $_lastrun_timestamps ]; then
+        	EXT_2_ENABLE=$(cat $EXTENSIONS_SWITCHER | jq -r ".${ts}.enable")
+	        EXT_2_DISABLE=$(cat $EXTENSIONS_SWITCHER | jq -r ".${ts}.disable")
+
+    	    if [ "$EXT_2_ENABLE" != "null" ]; then
+        	    EXT_2_ENABLE=$(echo $EXT_2_ENABLE | jq -r .[] )
+
+            	for ext in $EXT_2_ENABLE; do
+	                echo gnome-extensions enable $ext
+    	        done
+        	fi
+
+	        if [ "$EXT_2_DISABLE" != "null" ]; then
+    	        EXT_2_DISABLE=$(echo $EXT_2_DISABLE | jq -r .[] )
+
+        	    for ext in $EXT_2_DISABLE; do
+            	    echo gnome-extensions disable $ext
+	            done
+    	    fi
+
+			date +%Y%m%d%H%M > $LOCK_FILE
+	    fi
+	done
+fi
+
+if [ -f "$LOCK_FILE" ]; then
+	exit 0
+fi
+
+EXTENSIONS="arcmenu@arcmenu.com ding@rastersoft.com dash-to-panel@jderose9.github.com"
+for ext in $EXTENSIONS; do
+	gnome-extensions disable $ext
+done
+
+if [ "$(echo $LANG)" = "ru_RU.UTF-8" ]; then
+	CLASSIC="Классический вид c панелью и меню"
+	MODERN="GNOME Shell с доком и верхней панелью"
+	TITLE="Выбор оформления рабочего стола"
+	TEXT="Выберете дизайн оформления рабочего стола GNOME"
+else
+	CLASSIC="Classic mode with panel and menu"
+	MODERN="GNOME Shell with dock and upper panel"
+	TITLE="Desktop design selector"
+	TEXT="Choose design of GNOME desktop"
+fi
+
+table=(
+   /usr/share/gnome-flavour-selector/Classic_2.png "Classic" "$CLASSIC"
+   /usr/share/gnome-flavour-selector/Modern_2.png "Shell" "$MODERN"
+)
+
+MODE=$(GDK_BACKEND=x11 yad		\
+   --center						\
+   --no-escape					\
+   --on-top						\
+   --list						\
+   --no-headers					\
+   --title="$TITLE"				\
+   --text="$TEXT"				\
+   --text-width=60				\
+   --borders=20					\
+   --print-column=2				\
+   --hide-column=2				\
+   --separator=' '				\
+   --width=1000					\
+   --height=675					\
+   --column="Изображение:IMG"	\
+   --column="Описание:HD"		\
+   --column="Описание"			\
+   --button="Применить":20		\
+   --response=20				\
+   --auto-kill					\
+   "${table[@]}"
+)
+
+if [ -z $MODE ]; then
+	exit 1
+fi
+
+if [ $MODE = "Classic" ]; then
+	for ext in $EXTENSIONS; do
+		gnome-extensions enable $ext
+	done
+elif [ $MODE = "Shell" ]; then
+	gnome-extensions enable dash-to-dock@micxgx.gmail.com
+else
+	echo "Unknown"
+fi
+
+date +%Y%m%d%H%M > $LOCK_FILE