1 files changed, 67 insertions, 0 deletions
diff --git a/numpy/_build_utils/process_src_template.py b/numpy/_build_utils/process_src_template.py
new file mode 100644
index 000000000..4a0915e25
--- /dev/null
+++ b/numpy/_build_utils/process_src_template.py
@@ -0,0 +1,67 @@
+#!/usr/bin/env python3
+import sys
+import os
+import argparse
+import importlib.util
+
+
+def get_processor():
+    # Convoluted because we can't import from numpy.distutils
+    # (numpy is not yet built)
+    conv_template_path = os.path.join(
+        os.path.dirname(__file__),
+        '..', 'distutils', 'conv_template.py'
+    )
+    spec = importlib.util.spec_from_file_location(
+        'conv_template', conv_template_path
+    )
+    mod = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(mod)
+    return mod.process_file
+
+
+def process_and_write_file(fromfile, outfile):
+    """Process tempita templated file and write out the result.
+
+    The template file is expected to end in `.src`
+    (e.g., `.c.src` or `.h.src`).
+    Processing `npy_somefile.c.src` generates `npy_somefile.c`.
+
+    """
+    process_file = get_processor()
+    content = process_file(fromfile)
+    with open(outfile, 'w') as f:
+        f.write(content)
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "infile",
+        type=str,
+        help="Path to the input file"
+    )
+    parser.add_argument(
+        "-o",
+        "--outfile",
+        type=str,
+        help="Path to the output file"
+    )
+    parser.add_argument(
+        "-i",
+        "--ignore",
+        type=str,
+        help="An ignored input - may be useful to add a "
+        "dependency between custom targets",
+    )
+    args = parser.parse_args()
+
+    if not args.infile.endswith('.src'):
+        raise ValueError(f"Unexpected extension: {args.infile}")
+
+    outfile_abs = os.path.join(os.getcwd(), args.outfile)
+    process_and_write_file(args.infile, outfile_abs)
+
+
+if __name__ == "__main__":
+    main()