feat: make the {project} placeholder available to repair-wheel-command (#2589)

* Make the {project} placeholder available to repair-wheel-command

* Add separate test for {project} placeholder in repair-wheel-command

* Make the {project} placeholder available to repair-wheel-command

* reduce duplicated work in tests

* Use a valid wheel filename for the post-repair name

---------

Co-authored-by: Joe Rickerby <joerick@mac.com>

test/test_custom_repair_wheel.py

@@ -1,4 +1,5 @@
 import subprocess
+import textwrap
 from contextlib import nullcontext as does_not_raise
 
 import pytest
@@ -56,3 +57,42 @@ def test(tmp_path, capfd):
         # We only produced one wheel (perhaps Pyodide)
         # check that it has the right name
         assert result[0].startswith("spam-0.1.0-py2-none-")
+
+
+@pytest.mark.parametrize(
+    "repair_command",
+    [
+        "python repair.py {wheel} {dest_dir}",
+        "python {package}/repair.py {wheel} {dest_dir}",
+        "python {project}/repair.py {wheel} {dest_dir}",
+    ],
+    ids=["no-placeholder", "package-placeholder", "project-placeholder"],
+)
+def test_repair_wheel_command_structure(tmp_path, repair_command):
+    project_dir = tmp_path / "project"
+    project = test_projects.new_c_project()
+    project.files["repair.py"] = textwrap.dedent("""
+        import shutil
+        import sys
+        from pathlib import Path
+
+        wheel = Path(sys.argv[1])
+        dest_dir = Path(sys.argv[2])
+
+        dest_dir.mkdir(parents=True, exist_ok=True)
+        shutil.copy(wheel, dest_dir / "spamrepaired-0.0.1-py-none-any.whl")
+    """)
+
+    # Combined test for repair wheel command formats (plain, {package}, {project})
+    project.generate(project_dir)
+
+    result = utils.cibuildwheel_run(
+        project_dir,
+        add_env={
+            "CIBW_REPAIR_WHEEL_COMMAND": repair_command,
+            "CIBW_ARCHS": "native",
+        },
+        single_python=True,
+    )
+
+    assert result == ["spamrepaired-0.0.1-py-none-any.whl"]