pytorch

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# This Bazel rules file is derived from https://github.com/tensorflow/tensorflow/blob/master/third_party/common.bzl
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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", "template_rule")
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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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        "out": attr.output(mandatory = True),
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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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    },
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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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# Header template rule is an extension of template substitution rule
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# That also makes this header a valid dependency for cc_library
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# From https://stackoverflow.com/a/55407399
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def header_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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    return [
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        # create a provider which says that this
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        # out file should be made available as a header
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        CcInfo(compilation_context = cc_common.create_compilation_context(
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            # pass out the include path for finding this header
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            system_includes = depset([ctx.attr.include, ctx.outputs.out.dirname, ctx.bin_dir.path]),
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            # and the actual header here.
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            headers = depset([ctx.outputs.out]),
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        )),
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    ]
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header_template_rule = rule(
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    attrs = {
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        "include": attr.string(),
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        "out": attr.output(mandatory = True),
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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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    },
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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 = header_template_rule_impl,
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)
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