fix comments behavior on multiple lines with indentation

babi/file.py

@@ -673,44 +673,55 @@ class File:
     def _is_commented(self, lineno: int, prefix: str) -> bool:
         return self.buf[lineno].lstrip().startswith(prefix)
 
+    def _indent(self, lineno: int) -> str:
+        ws_match = WS_RE.match(self.buf[lineno])
+        assert ws_match is not None
+        return ws_match[0]
+
+    def _minimum_indent_for_selection(self) -> int:
+        s_y, e_y = self._selection_lines()
+        return min(len(self._indent(lineno)) for lineno in range(s_y, e_y))
+
     def _comment_remove(self, lineno: int, prefix: str) -> None:
         line = self.buf[lineno]
-        ws_match = WS_RE.match(line)
-        assert ws_match is not None
-        ws_len = len(ws_match[0])
-        rest_offset = ws_len + len(prefix)
-        if line.startswith(prefix, ws_len):
-            self.buf[lineno] = f'{ws_match[0]}{line[rest_offset:].lstrip()}'
+        indent = self._indent(lineno)
+        ws_len = len(indent)
+
+        if line.startswith(f'{prefix} ', ws_len):
+            self.buf[lineno] = f'{indent}{line[ws_len + len(prefix) + 1:]}'
+        elif line.startswith(prefix, ws_len):
+            self.buf[lineno] = f'{indent}{line[ws_len + len(prefix):]}'
+
         if self.buf.y == lineno and self.buf.x > ws_len:
             self.buf.x -= len(line) - len(self.buf[lineno])
 
-    def _comment_add(self, lineno: int, prefix: str) -> None:
-        prefix = f'{prefix} '
+    def _comment_add(self, lineno: int, prefix: str, s_offset: int) -> None:
         line = self.buf[lineno]
-        ws_match = WS_RE.match(line)
-        assert ws_match is not None
-        ws_len = len(ws_match[0])
-        self.buf[lineno] = f'{ws_match[0]}{prefix}{line[ws_len:]}'
-        if lineno == self.buf.y and self.buf.x > ws_len:
-            self.buf.x += len(prefix)
+
+        self.buf[lineno] = f'{line[:s_offset]}{prefix} {line[s_offset:]}'
+
+        if lineno == self.buf.y and self.buf.x > s_offset:
+            self.buf.x += len(self.buf[lineno]) - len(line)
 
     @edit_action('comment', final=True)
     def toggle_comment(self, prefix: str) -> None:
         if self._is_commented(self.buf.y, prefix):
             self._comment_remove(self.buf.y, prefix)
         else:
-            self._comment_add(self.buf.y, prefix)
+            ws_len = len(self._indent(self.buf.y))
+            self._comment_add(self.buf.y, prefix, ws_len)
 
     @edit_action('comment selection', final=True)
     @clear_selection
     def toggle_comment_selection(self, prefix: str) -> None:
         s_y, e_y = self._selection_lines()
         commented = self._is_commented(s_y, prefix)
+        minimum_indent = self._minimum_indent_for_selection()
         for lineno in range(s_y, e_y):
             if commented:
                 self._comment_remove(lineno, prefix)
             else:
-                self._comment_add(lineno, prefix)
+                self._comment_add(lineno, prefix, minimum_indent)
 
     DISPATCH = {
         # movement

tests/features/comment_test.py

@@ -1,7 +1,16 @@
+import pytest
+
 from testing.runner import and_exit
 from testing.runner import trigger_command_mode
 
 
+@pytest.fixture
+def three_lines_with_indentation(tmpdir):
+    f = tmpdir.join('f')
+    f.write('line_0\n    line_1\n    line_2')
+    return f
+
+
 def test_comment_some_code(run, ten_lines):
     with run(str(ten_lines)) as h, and_exit(h):
         h.press('S-Down')
@@ -75,6 +84,62 @@ def test_comment_with_trailing_whitespace(run, ten_lines):
         h.await_text('// line_0\nline_1\n')
 
 
+def test_comment_some_code_with_indentation(run, three_lines_with_indentation):
+    with run(str(three_lines_with_indentation)) as h, and_exit(h):
+        h.press('S-Down')
+
+        trigger_command_mode(h)
+        h.press_and_enter(':comment')
+
+        h.await_text('# line_0\n#     line_1\n    line_2\n')
+
+        h.press('S-Up')
+        trigger_command_mode(h)
+        h.press_and_enter(':comment')
+
+        h.await_text('line_0\n    line_1\n    line_2\n')
+
+
+def test_comment_some_code_on_indent_part(run, three_lines_with_indentation):
+    with run(str(three_lines_with_indentation)) as h, and_exit(h):
+        h.press('Down')
+        h.press('S-Down')
+
+        trigger_command_mode(h)
+        h.press_and_enter(':comment')
+
+        h.await_text('line_0\n    # line_1\n    # line_2\n')
+
+        h.press('S-Up')
+
+        trigger_command_mode(h)
+        h.press_and_enter(':comment')
+
+        h.await_text('line_0\n    line_1\n    line_2\n')
+
+
+def test_comment_some_code_on_tabs_part(run, tmpdir):
+    f = tmpdir.join('f')
+    f.write('line_0\n\tline_1\n\t\tline_2')
+
+    with run(str(f)) as h, and_exit(h):
+        h.await_text('line_0\n    line_1\n        line_2')
+        h.press('Down')
+        h.press('S-Down')
+
+        trigger_command_mode(h)
+        h.press_and_enter(':comment')
+
+        h.await_text('line_0\n    # line_1\n    #   line_2')
+
+        h.press('S-Up')
+
+        trigger_command_mode(h)
+        h.press_and_enter(':comment')
+
+        h.await_text('line_0\n    line_1\n        line_2')
+
+
 def test_comment_cursor_at_end_of_line(run, ten_lines):
     with run(str(ten_lines)) as h, and_exit(h):
         h.press('# ')
@@ -112,3 +177,15 @@ def test_do_not_move_if_cursor_before_comment(run, tmpdir):
         h.press_and_enter(':comment')
 
         h.await_cursor_position(x=4, y=1)
+
+
+@pytest.mark.parametrize('comment', ('# ', '#'))
+def test_remove_comment_with_comment_elsewhere_in_line(run, tmpdir, comment):
+    f = tmpdir.join('f')
+    f.write(f'{comment}print("not a # comment here!")\n')
+
+    with run(str(f)) as h, and_exit(h):
+        trigger_command_mode(h)
+        h.press_and_enter(':comment')
+
+        h.await_text('\nprint("not a # comment here!")\n')