1 files changed, 57 insertions, 0 deletions
diff --git a/flit_core/bootstrap_install.py b/flit_core/bootstrap_install.py
new file mode 100644
index 0000000..1fd4c87
--- /dev/null
+++ b/flit_core/bootstrap_install.py
@@ -0,0 +1,57 @@
+"""Install flit_core without using any other tools.
+
+Normally, you would install flit_core with pip like any other Python package.
+This script is meant to help with 'bootstrapping' other packaging
+systems, where you may need flit_core to build other packaging tools.
+
+Use 'python -m flit_core.wheel' to make a wheel, then:
+
+    python bootstrap_install.py flit_core-3.6.0-py3-none-any.whl
+
+To install for something other than the Python running the script, pass a
+site-packages or equivalent directory with the --installdir option.
+"""
+import argparse
+import sys
+import sysconfig
+from pathlib import Path
+from zipfile import ZipFile
+
+def extract_wheel(whl_path, dest):
+    print("Installing to", dest)
+    with ZipFile(whl_path) as zf:
+        zf.extractall(dest)
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        'wheel',
+        type=Path,
+        help=f'flit_core wheel to install (.whl file)',
+    )
+    purelib = Path(sysconfig.get_path('purelib')).resolve()
+    parser.add_argument(
+        '--installdir',
+        '-i',
+        type=Path,
+        default=purelib,
+        help=f'installdir directory (defaults to {purelib})',
+    )
+    parser.add_argument(
+        '--install-root',
+        type=Path,
+        default=None,
+        help='if given, installdir is considered to be under this'
+    )
+
+    args = parser.parse_args()
+
+    if not args.wheel.name.startswith('flit_core-'):
+        sys.exit("Use this script only for flit_core wheels")
+    if args.install_root:
+        installdir = args.install_root / args.installdir.relative_to("/")
+    else:
+        installdir = args.installdir
+
+    installdir.mkdir(parents=True, exist_ok=True)
+    extract_wheel(args.wheel, installdir)