Workaround the Github forgetting styles bug

cibuildwheel/__main__.py

@@ -22,9 +22,11 @@ from cibuildwheel.typing import PLATFORMS, PlatformName, assert_never
 from cibuildwheel.util import (
     CIBW_CACHE_PATH,
     BuildSelector,
+    CIProvider,
     Unbuffered,
     chdir,
     detect_ci_provider,
+    fix_ansi_codes_for_github_actions,
 )
 
 
@@ -319,7 +321,10 @@ def print_preamble(platform: str, options: Options, identifiers: list[str]) -> N
 
     print("Build options:")
     print(f"  platform: {platform}")
-    print(textwrap.indent(options.summary(identifiers), "  "))
+    options_summary = textwrap.indent(options.summary(identifiers), "  ")
+    if detect_ci_provider() == CIProvider.github_actions:
+        options_summary = fix_ansi_codes_for_github_actions(options_summary)
+    print(options_summary)
 
     print()
     print(f"Cache folder: {CIBW_CACHE_PATH}")

cibuildwheel/options.py

@@ -669,6 +669,10 @@ class Options:
         default_value: Any,
         overrides: dict[str, Any] | None = None,
     ) -> str:
+        """
+        Return a summary of the option value, including any overrides, with
+        ANSI 'dim' color if it's the default.
+        """
         value_str = self.option_summary_value(option_value)
         default_value_str = self.option_summary_value(default_value)
         overrides_value_strs = {

cibuildwheel/util.py

@@ -672,3 +672,31 @@ def chdir(new_path: Path | str) -> Generator[None, None, None]:
         yield
     finally:
         os.chdir(cwd)
+
+
+def fix_ansi_codes_for_github_actions(text: str) -> str:
+    """
+    Github Actions forgets the current ANSI style on every new line. This
+    function repeats the current ANSI style on every new line.
+    """
+    ansi_code_regex = re.compile(r"(\033\[[0-9;]*m)")
+    ansi_codes: list[str] = []
+    output = ""
+
+    for line in text.split("\n"):
+        # add the current ANSI codes to the beginning of the line
+        output += "".join(ansi_codes) + line + "\n"
+
+        # split the line at each ANSI code
+        parts = ansi_code_regex.split(line)
+        # if there are any ANSI codes, save them
+        if len(parts) > 1:
+            # iterate over the ANSI codes in this line
+            for code in parts[1::2]:
+                if code == "\033[0m":
+                    # reset the list of ANSI codes when the clear code is found
+                    ansi_codes = []
+                else:
+                    ansi_codes.append(code)
+
+    return output