Add basic Codu framework

.gitignore

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+.venv
+.idea

Pipfile

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+[[source]]
+url = "https://pypi.org/simple"
+verify_ssl = true
+name = "pypi"
+
+[packages]
+textual = "*"
+base64-random = "*"
+
+[dev-packages]
+textual-dev = "*"
+
+[requires]
+python_version = "3.14"

codupoc/codupoc.py

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+from textual.app import App, ComposeResult
+from textual.containers import VerticalScroll
+from textual.widgets import Checkbox, Input, Header, Footer
+
+from base64_random import gen_random_base64
+
+class NewTodo(Input):
+    def on_input_submitted(self, event: Input.Submitted) -> None:
+        self.main_app.save_todo(event.value)
+
+    def __init__(self, main_app: Codupoc, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.main_app = main_app
+
+
+class TodoItem(Checkbox):
+    def __init__(self, main_app: Codupoc, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.main_app = main_app
+
+
+class Codupoc(App[None]):
+    CSS_PATH = "codupoc.tcss"
+
+    BINDINGS = [
+        ("n", "new_todo", "Add a new Todo list item"),
+    ]
+
+    def compose(self) -> ComposeResult:
+        yield Header()
+        yield VerticalScroll(id="list_items")
+        yield Footer()
+
+    def action_new_todo(self):
+        tinput = NewTodo(self, placeholder="What needs to be done?", id="newtodo")
+        scroller = self.query_one("#list_items")
+        scroller.mount(tinput)
+        tinput.focus()
+
+    def save_todo(self, value: str):
+        tinput = self.query_one("#newtodo")
+        tinput.remove()
+        todo = Checkbox(value)
+        scroller = self.query_one("#list_items")
+        scroller.mount(todo)
+        todo.scroll_visible()
+        todo.focus()
+
+    def insert_todo(self, title: str, scroller: VerticalScroll):
+        id = gen_random_base64(10)
+        self.todos[id] = { "title": title, "completed": False }
+
+
+    def __init__(self):
+        super().__init__()
+        self.todos = {}
+
+
+if __name__ == "__main__":
+    app = Codupoc()
+    app.run()