WIP initial working stamping rule

stamping/BUILD.bazel

@@ -0,0 +1,14 @@
+# Copyright (C) 2022 Swift Navigation Inc.
+# Contact: Swift Navigation <dev@swift-nav.com>
+#
+# This source is subject to the license found in the file 'LICENSE' which must
+# be be distributed together with this source. All other rights reserved.
+#
+# THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
+# EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
+
+exports_files(
+    glob(["*.bzl"]) + ["stamping.py"],
+    visibility = ["//visibility:public"],
+)

stamping/stamping.bzl

@@ -0,0 +1,35 @@
+def _stamping_impl(ctx):
+    file = ctx.version_file
+    tpl = ctx.file.template
+    out = ctx.actions.declare_file(ctx.attr.out)
+
+    args = ctx.actions.args()
+    args.add(file)
+    args.add(tpl)
+    args.add(out)
+
+    ctx.actions.run(
+        inputs = [file, tpl],
+        executable = ctx.executable.exec,
+        arguments = [args],
+        outputs = [out],
+    )
+
+    return [DefaultInfo(files = depset([out]))]
+
+stamping = rule(
+    implementation = _stamping_impl,
+    attrs = {
+        "out": attr.string(),
+        "template": attr.label(
+            allow_single_file = [".in"],
+            mandatory = True,
+        ),
+        "exec": attr.label(
+            executable = True,
+            cfg = "exec",
+            allow_files = True,
+            default = "//stamping:stamping.py",
+        ),
+    },
+)

stamping/stamping.py

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+#!/usr/bin/env python3
+
+"""
+Script for lulz.
+"""
+
+from string import Template
+
+import argparse
+
+
+def init() -> argparse.Namespace:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("input")
+    parser.add_argument("template")
+    parser.add_argument("output")
+    return parser.parse_args()
+
+
+def main() -> None:
+    args = init()
+    with open(args.input) as input, open(args.template) as tpl, open(
+        args.output, "w"
+    ) as out:
+        subs = dict(
+            (line.split(" ")[0], line.split(" ")[1]) for line in input.readlines()
+        )
+        s = Template(tpl.read())
+        out.write(s.substitute(subs))
+
+
+if __name__ == "__main__":
+    main()