diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..1e33a63
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+/.dev/
+__pycache__/
+*.swp
diff --git a/sqle/__init__.py b/sqle/__init__.py
new file mode 100644
index 0000000..9c49fad
--- /dev/null
+++ b/sqle/__init__.py
@@ -0,0 +1,3 @@
+
+# TODO
+
diff --git a/sqle/__main__.py b/sqle/__main__.py
new file mode 100644
index 0000000..f552d54
--- /dev/null
+++ b/sqle/__main__.py
@@ -0,0 +1,10 @@
+from imgui_bundle import imgui, imgui_ctx, immapp
+
+import sqle.win
+
+term = sqle.win.Terminal()
+
+immapp.run(
+  window_title = "SQLE",
+  gui_function = lambda: term.gui(),
+)
diff --git a/sqle/utl/__init__.py b/sqle/utl/__init__.py
new file mode 100644
index 0000000..2d3dcd1
--- /dev/null
+++ b/sqle/utl/__init__.py
@@ -0,0 +1 @@
+from .future import Future, Promise
diff --git a/sqle/utl/future.py b/sqle/utl/future.py
new file mode 100644
index 0000000..04f989b
--- /dev/null
+++ b/sqle/utl/future.py
@@ -0,0 +1,26 @@
+from typing import Generic, TypeVar
+from threading import Event
+
+T = TypeVar("T")
+
+class Future(Generic[T]):
+  _event: Event = Event()
+  _data : T|None = None
+
+  def get(self) -> T|None:
+    return self._data if self.filled() else None
+
+  def filled(self) -> bool:
+    return self._event.is_set()
+
+class Promise(Future[T]):
+  def fill(self, data: T):
+    self._data = data
+    self._event.set()
+    return self
+
+def is_filled(fut: Future[T]|None):
+  return fut.filled() if fut is not None else False
+
+def is_filling(fut: Future[T]|None):
+  return (not fut.filled()) if fut is not None else False
diff --git a/sqle/win/__init__.py b/sqle/win/__init__.py
new file mode 100644
index 0000000..a3b7b08
--- /dev/null
+++ b/sqle/win/__init__.py
@@ -0,0 +1 @@
+from .terminal import Terminal
diff --git a/sqle/win/terminal.py b/sqle/win/terminal.py
new file mode 100644
index 0000000..26bd1f0
--- /dev/null
+++ b/sqle/win/terminal.py
@@ -0,0 +1,44 @@
+from imgui_bundle import imgui, imgui_ctx
+from abc import ABCMeta, abstractmethod
+
+from sqle.utl.future import Future, Promise, is_filling, is_filled
+
+
+class Terminal:
+  def __init__(self):
+    self._sql = ""
+    self._io  = _IO()
+
+    self._req_sql = None
+    self._req_fut = None
+
+  def gui(self) -> None:
+    with imgui_ctx.begin("my first window"):
+      modified, self._sql = imgui.input_text(
+        "##sql",
+        self._sql,
+      )
+
+      if imgui.is_item_deactivated_after_edit():
+        accept_enter = (self._req_sql != self._sql) or (not is_filling(self._req_fut))
+        if accept_enter:
+          # TODO: abort prev future
+          self._req_fut = self._io.try_exec(self._sql)
+
+      if is_filled(self._req_fut):
+        msg = self._req_fut.get()
+        imgui.text(msg if msg is not None else "OK")
+
+        # TODO: display table
+
+# an interface the Terminal window wants for handling SQL
+class IO(metaclass = ABCMeta):
+  @abstractmethod
+  def try_exec(self, sql: str) -> Promise[str|None]:  # TODO: return also SQL result
+    pass
+
+# an impl of IO for testing
+class _IO(IO):
+  def try_exec(self, sql):
+    print("exec: "+sql)
+    return Promise().fill(None)