Improve the formatting of the preamble

cibuildwheel/util.py

@@ -270,6 +270,14 @@ class BuildSelector:
 
         return should_build and not should_skip
 
+    def options_summary(self) -> Any:
+        return {
+            "build_config": self.build_config,
+            "skip_config": self.skip_config,
+            "requires_python": str(self.requires_python),
+            "prerelease_pythons": self.prerelease_pythons,
+        }
+
 
 @dataclass(frozen=True)
 class TestSelector:
@@ -283,6 +291,9 @@ class TestSelector:
         should_skip = selector_matches(self.skip_config, build_id)
         return not should_skip
 
+    def options_summary(self) -> Any:
+        return {"skip_config": self.skip_config}
+
 
 # Taken from https://stackoverflow.com/a/107717
 class Unbuffered:
@@ -356,6 +367,12 @@ class DependencyConstraints:
 
         return self.base_file_path == o.base_file_path
 
+    def options_summary(self) -> Any:
+        if self == DependencyConstraints.with_defaults():
+            return "pinned"
+        else:
+            return self.base_file_path.name
+
 
 class NonPlatformWheelError(Exception):
     def __init__(self) -> None: