highlight_area() (#20)

Co-authored-by: rdbende <[email protected]>

chlorophyll/codeview.py

@@ -180,6 +180,20 @@ def highlight_all(self) -> None:
                 self.tag_add(token, start_index, end_index)
             start_index = end_index
 
+    def highlight_area(self, start_line: int, end_line: int) -> None:
+        for tag in self.tag_names(index=None):
+            if tag.startswith("Token"):
+                self.tag_remove(tag, f"{start_line}.0", f"{end_line}.end")
+
+        text = self.get(f"{start_line}.0", f"{end_line}.end")
+        start_index = f"{start_line}.0"
+        for token, text in pygments.lex(text, self._lexer()):
+            token = str(token)
+            end_index = self.index(f"{start_index} + {len(text)} indices")
+            if token not in {"Token.Text.Whitespace", "Token.Text"}:
+                self.tag_add(token, start_index, end_index)
+            start_index = end_index
+
     def _set_color_scheme(
         self, color_scheme: dict[str, dict[str, str | int]] | str | None
     ) -> None:
@@ -254,7 +268,7 @@ def horizontal_scroll(self, first: str | float, last: str | float) -> CodeView:
 
     def vertical_scroll(self, first: str | float, last: str | float) -> CodeView:
         self._vs.set(first, last)
-        self._line_numbers.reload(self.cget("font"))
+        self._line_numbers.reload()
 
     def scroll_line_update(self, event: Event | None = None) -> CodeView:
         self.horizontal_scroll(*self.xview())