feat: show cursor position and char count in status bar

Author: chrisdpurcell

src/views/main_window.py

@@ -177,6 +177,10 @@ def _load_ui(self) -> None:
             -1,
         )
 
+        # Permanent status bar label — lives on the right, never overwritten by showMessage()
+        self._cursor_label = QLabel("Ln 1, Col 1 | 0 chars")
+        self.ui.statusBar().addPermanentWidget(self._cursor_label)
+
     def _setup_file_tree(self) -> None:
         """Configure QFileSystemModel rooted at the user's home directory."""
         self._fs_model = QFileSystemModel(self.ui)
@@ -239,6 +243,9 @@ def _connect_signals(self) -> None:
             lambda _: self._update_title()
         )
 
+        # Cursor position: update permanent label on every cursor move
+        self._plain_text_edit.cursorPositionChanged.connect(self._update_cursor_label)
+
         # Keyboard shortcuts not present in the .ui file.
         # (Ctrl+S/O/Q/Shift+S are already wired via QAction shortcuts in main_window.ui.)
         # ApplicationShortcut context: fires even when a child widget holds focus,
@@ -378,6 +385,14 @@ def _update_title(self) -> None:
         suffix = " *" if modified else ""
         self.ui.setWindowTitle(f"TextTools — {name}{suffix}" if name else "TextTools")
 
+    def _update_cursor_label(self) -> None:
+        """Update the permanent cursor position label in the status bar."""
+        cursor = self._plain_text_edit.textCursor()
+        line = cursor.blockNumber() + 1
+        col = cursor.columnNumber() + 1
+        chars = len(self._plain_text_edit.toPlainText())
+        self._cursor_label.setText(f"Ln {line}, Col {col} | {chars:,} chars")
+
     # ------------------------------------------ ViewModel signal handlers
 
     def _on_document_loaded(self, content: str) -> None:

tests/integration/test_main_window.py

@@ -415,3 +415,28 @@ def test_convert_button_calls_viewmodel(self, window, qtbot):
         with patch.object(window._viewmodel, "convert_to_utf8") as mock_convert:
             window._convert_button.click()
         mock_convert.assert_called_once_with("hello")
+
+
+class TestStatusBarCursorPosition:
+    def test_cursor_label_exists(self, window):
+        """A permanent cursor label must be visible in the status bar."""
+        assert hasattr(window, "_cursor_label")
+        assert window._cursor_label.text() != ""
+
+    def test_cursor_label_shows_line_and_col(self, window, qtbot):
+        """Moving the cursor must update the cursor label."""
+        window._plain_text_edit.setPlainText("first line\nsecond line")
+        # Move cursor to start of second line (position 11)
+        cursor = window._plain_text_edit.textCursor()
+        cursor.setPosition(11)
+        window._plain_text_edit.setTextCursor(cursor)
+        qtbot.wait(10)
+        label_text = window._cursor_label.text()
+        assert "Ln 2" in label_text
+        assert "Col 1" in label_text
+
+    def test_cursor_label_shows_char_count(self, window, qtbot):
+        """The cursor label must include the document character count."""
+        window._plain_text_edit.setPlainText("hello")
+        qtbot.wait(10)
+        assert "5" in window._cursor_label.text()