forked from OSchip/llvm-project
47 lines
1.4 KiB
Python
47 lines
1.4 KiB
Python
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# This file is licensed under the Apache License v2.0 with LLVM Exceptions.
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# See https://llvm.org/LICENSE.txt for license information.
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# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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# Rule for simple expansion of template files. This performs a simple
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# search over the template file for the keys in substitutions,
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# and replaces them with the corresponding values.
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#
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# Typical usage:
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# load("/tools/build_rules/template_rule", "expand_header_template")
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# template_rule(
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# name = "ExpandMyTemplate",
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# src = "my.template",
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# out = "my.txt",
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# substitutions = {
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# "$VAR1": "foo",
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# "$VAR2": "bar",
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# }
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# )
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#
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# Args:
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# name: The name of the rule.
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# template: The template file to expand
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# out: The destination of the expanded file
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# substitutions: A dictionary mapping strings to their substitutions
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def template_rule_impl(ctx):
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ctx.actions.expand_template(
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template = ctx.file.src,
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output = ctx.outputs.out,
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substitutions = ctx.attr.substitutions,
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)
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template_rule = rule(
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attrs = {
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"src": attr.label(
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mandatory = True,
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allow_single_file = True,
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),
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"substitutions": attr.string_dict(mandatory = True),
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"out": attr.output(mandatory = True),
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},
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# output_to_genfiles is required for header files.
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output_to_genfiles = True,
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implementation = template_rule_impl,
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)
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