tut: work on sphinx_codes_include extension

Author: pthom

tutorial/jbook/discover/hello_world.md

@@ -12,14 +12,7 @@ We will follow the steps below:
 2. We use the `imgui.text()` (Python) or `ImGui::Text` (C++) function to display a text in the window.
 3. We call `hello_imgui.run()` (Python) or `HelloImGui::Run()` (C++) to start the application, optionally specifying the window title and size, or if we want it to set its size automatically.
 
-
-**Python**
-```{literalinclude} hello_world.py
-```
-
-
-**C++**
-```{literalinclude} hello_world.cpp
+```{codes_include} discover/hello_world
 ```
 
 
@@ -43,11 +36,5 @@ We will follow the steps below:
 *Note: In the case of a web application, such as in this tutorial, the "exit" button will not have any effect. In the case of a desktop application, it will close the window.*
 
 
-**Python**
-```{literalinclude} button.py
-```
-
-
-**C++**
-```{literalinclude} button.cpp
+```{codes_include} discover/button
 ```

tutorial/jbook/discover/layout_advices.md

@@ -30,11 +30,5 @@ The code below demonstrates these advices and create this application:
 ![](layout_advices.jpg)
 
 
-**Python**
-```{literalinclude} layout_advices.py
-```
-
-
-**C++**
-```{literalinclude} layout_advices.cpp
+```{codes_include} discover/layout_advices
 ```

tutorial/jbook/discover/widget_edit.md

@@ -16,12 +16,5 @@ Here, we use Hello ImGui to display images. See the doc about Hello ImGui for mo
 image_from_asset will keep the aspect ratio of the image if one of the dimensions is set to 0.
 
 
-**Python**
-```{literalinclude} widget_edit.py
+```{codes_include} discover/widget_edit
 ```
-
-
-**C++**
-```{literalinclude} widget_edit.cpp
-```
-

tutorial/jbook/sphinx_ext_imgui/sphinx_codes_include.py

@@ -13,7 +13,8 @@ class CodesIncludeDirective(Directive):
     option_spec = {}  # No specific options
 
     def run(self):
-        base_name = self.arguments[0]
+        base_name = self.arguments[0]  # The filename provided in the directive
+
         content = []
 
         # Generate tab-set Markdown syntax