Fixing no stdin error (#10)

rexi/cli.py

@@ -1,4 +1,5 @@
 import os
+import select
 import sys
 from typing import Annotated, Optional
 
@@ -40,6 +41,23 @@ def rexi_cli(
     if input_file:
         input_text = input_file.read()
     else:
+        """
+        Yep this part is abit ugly.
+        couldn't find a better way to implement it so it will work with `typer`, `pytest` and `textual`
+        """  # noqa: E501
+        if not select.select(
+            [
+                sys.stdin,
+            ],
+            [],
+            [],
+            0.0,
+        )[0]:
+            raise typer.BadParameter(
+                "stdin is empty, "
+                "please provide text thru the stdin "
+                "or use the `-i` flag"
+            )
         input_text = sys.stdin.read()
         try:
             os.close(sys.stdin.fileno())

tests/test_cli.py

@@ -18,11 +18,16 @@ def test_on_args(monkeypatch: MonkeyPatch) -> None:
     class_mock = Mock()
     instance_mock = Mock()
     open_mock = Mock()
+    select = Mock()
+
     with monkeypatch.context():
+        select.return_value = [[True]]
         class_mock.return_value = instance_mock
+        monkeypatch.setattr("select.select", select)
         monkeypatch.setattr("rexi.cli.RexiApp", class_mock)
         monkeypatch.setattr("builtins.open", open_mock)
         runner.invoke(app, input=a)
+
     open_mock.assert_called_once_with("/dev/tty", "rb")
     class_mock.assert_called_once_with(
         text.decode(), initial_mode=None, initial_pattern=None
@@ -67,3 +72,16 @@ def test_initial_mode(monkeypatch: MonkeyPatch, tmp_path: Path) -> None:
         monkeypatch.setattr("rexi.cli.RexiApp", class_mock)
         runner.invoke(app, args=["-i", str(tmp_path / "text_file"), "--mode", "match"])
     class_mock.assert_called_once_with(text, initial_mode="match", initial_pattern=None)
+
+
+def test_no_stdin_error(monkeypatch: MonkeyPatch) -> None:
+    """
+    Couldn't find a better way to test the CLI without patching everything :(
+    """
+    runner = CliRunner()
+    select = Mock()
+    with monkeypatch.context():
+        select.return_value = [[]]
+        monkeypatch.setattr("select.select", select)
+        result = runner.invoke(app)
+    assert "Invalid value" in result.output