Add common template_file rule
This adds a template_file rule, which is used often when building C/C++ dependencies which use
autotools or similar build systems upstream. Taken from an existing repo of various Bazel helper rules.
Test Plan: None
X-Origin-Diff: phab/D707
GitOrigin-RevId: 9cc818803b2fed9e15677924dbc9137c39459151
diff --git a/build/utils/template_file.bzl b/build/utils/template_file.bzl
new file mode 100644
index 0000000..8dc6d24
--- /dev/null
+++ b/build/utils/template_file.bzl
@@ -0,0 +1,61 @@
+# Copyright 2020 The Monogon Project Authors.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Copyright 2018 Josh Pieper, jjp@pobox.com.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+def _dictify(data):
+ result = dict([x.split("=", 1) for x in data])
+ return result
+
+def _template_file_impl(ctx):
+ out = ctx.actions.declare_file(ctx.label.name)
+
+ substitutions = dict(ctx.attr.substitutions)
+ substitutions.update(_dictify(ctx.attr.substitution_list))
+
+ ctx.actions.expand_template(
+ template = ctx.files.src[0],
+ output = out,
+ substitutions = substitutions,
+ is_executable = ctx.attr.is_executable,
+ )
+ return [DefaultInfo(
+ files = depset([out]),
+ data_runfiles = ctx.runfiles(files = [out]),
+ )]
+
+template_file = rule(
+ attrs = {
+ "src": attr.label(allow_files = True),
+ "is_executable": attr.bool(default = False),
+ "substitutions": attr.string_dict(),
+ "substitution_list": attr.string_list(),
+ },
+ output_to_genfiles = True,
+ implementation = _template_file_impl,
+)