fix for expand tabs

src/textual/content.py

@@ -334,10 +334,7 @@ def styled(
         """
         if not text:
             return Content("")
-        span_length = cell_len(text) if cell_length is None else cell_length
-        new_content = cls(
-            text, [Span(0, span_length, style)] if style else None, span_length
-        )
+        new_content = cls(text, [Span(0, len(text), style)] if style else None)
         return new_content
 
     @classmethod
@@ -844,6 +841,8 @@ def iter_content() -> Iterable[Content]:
         total_cell_length: int | None = self._cell_length
 
         for content in iter_content():
+            if not content:
+                continue
             extend_text(content._text)
             extend_spans(
                 _Span(offset + start, offset + end, style)
@@ -1437,6 +1436,9 @@ def expand_tabs(self, tab_size: int = 8) -> Content:
         if "\t" not in self.plain:
             return self
 
+        if not self._spans:
+            return Content(self.plain.expandtabs(tab_size))
+
         new_text: list[Content] = []
         append = new_text.append
 
@@ -1449,7 +1451,7 @@ def expand_tabs(self, tab_size: int = 8) -> Content:
                 for part in parts:
                     if part.plain.endswith("\t"):
                         part = Content(
-                            part._text[-1][:-1] + " ", part._spans, part._cell_length
+                            part._text[:-1] + " ", part._spans, part._cell_length
                         )
                         cell_position += part.cell_length
                         tab_remainder = cell_position % tab_size

src/textual/style.py

@@ -41,7 +41,7 @@
 )
 
 
-@rich.repr.auto(angular=True)
+@rich.repr.auto()
 @dataclass(frozen=True)
 class Style:
     """Represents a style in the Visual interface (color and other attributes).

tests/test_content.py

@@ -294,3 +294,47 @@ def test_simplify():
     assert content.spans == [Span(0, 3, "bold"), Span(3, 6, "bold")]
     content.simplify()
     assert content.spans == [Span(0, 6, "bold")]
+
+
+@pytest.mark.parametrize(
+    ["input", "tab_width", "expected"],
+    [
+        (Content(""), 8, Content("")),
+        (Content("H"), 8, Content("H")),
+        (Content("Hello"), 8, Content("Hello")),
+        (Content("\t"), 8, Content(" " * 8)),
+        (Content("A\t"), 8, Content("A" + " " * 7)),
+        (Content("ABCD\t"), 8, Content("ABCD" + " " * 4)),
+        (Content("ABCDEFG\t"), 8, Content("ABCDEFG ")),
+        (Content("ABCDEFGH\t"), 8, Content("ABCDEFGH" + " " * 8)),
+        (Content("Hel\tlo!"), 4, Content("Hel lo!")),
+        (Content("\t\t"), 4, Content(" " * 8)),
+        (Content("FO\t\t"), 4, Content("FO      ")),
+        (Content("FO\tOB\t"), 4, Content("FO  OB  ")),
+        (
+            Content("FOO", spans=[Span(0, 3, "red")]),
+            4,
+            Content("FOO", spans=[Span(0, 3, "red")]),
+        ),
+        (
+            Content("FOO\tBAR", spans=[Span(0, 3, "red")]),
+            8,
+            Content("FOO     BAR", spans=[Span(0, 3, "red")]),
+        ),
+        (
+            Content("FOO\tBAR", spans=[Span(0, 3, "red"), Span(4, 8, "blue")]),
+            8,
+            Content("FOO     BAR", spans=[Span(0, 3, "red"), Span(8, 11, "blue")]),
+        ),
+        (
+            Content("foo\tbar\nbaz", spans=[Span(0, 11, "red")]),
+            8,
+            Content("foo     bar\nbaz", spans=[Span(0, 15, "red")]),
+        ),
+    ],
+)
+def test_expand_tabs(input: Content, tab_width: int, expected: Content):
+    output = input.expand_tabs(tab_width).simplify()
+    print(repr(output))
+    assert output.plain == expected.plain
+    assert output._spans == expected._spans