BLD: Add meson build scripts (#49114)

* BLD: Add script to generate pxi from pxi.in for meson

* BLD: Add scripts to generate the project version

Author: lithomas1

Diff for: scripts/generate_pxi.py

@@ -0,0 +1,33 @@
+import argparse
+import os
+
+from Cython import Tempita
+
+
+def process_tempita(pxifile, outfile):
+    with open(pxifile) as f:
+        tmpl = f.read()
+    pyxcontent = Tempita.sub(tmpl)
+
+    with open(outfile, "w") as f:
+        f.write(pyxcontent)
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("infile", type=str, help="Path to the input file")
+    parser.add_argument("-o", "--outdir", type=str, help="Path to the output directory")
+    args = parser.parse_args()
+
+    if not args.infile.endswith(".in"):
+        raise ValueError(f"Unexpected extension: {args.infile}")
+
+    outdir_abs = os.path.join(os.getcwd(), args.outdir)
+    outfile = os.path.join(
+        outdir_abs, os.path.splitext(os.path.split(args.infile)[1])[0]
+    )
+
+    process_tempita(args.infile, outfile)
+
+
+main()

Diff for: scripts/generate_version.py

@@ -0,0 +1,34 @@
+import argparse
+import os
+
+import versioneer
+
+
+def write_version_info(path):
+    if os.environ.get("MESON_DIST_ROOT"):
+        # raise ValueError("dist root is", os.environ.get("MESON_DIST_ROOT"))
+        path = os.path.join(os.environ.get("MESON_DIST_ROOT"), path)
+    with open(path, "w") as file:
+        file.write(f'__version__="{versioneer.get_version()}"\n')
+        file.write(
+            f'__git_version__="{versioneer.get_versions()["full-revisionid"]}"\n'
+        )
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "-o", "--outfile", type=str, help="Path to write version info to"
+    )
+    args = parser.parse_args()
+
+    if not args.outfile.endswith(".py"):
+        raise ValueError(
+            f"Output file must be a Python file. "
+            f"Got: {args.outfile} as filename instead"
+        )
+
+    write_version_info(args.outfile)
+
+
+main()