Initial commit

BUILD

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+licenses(["notice"])

WORKSPACE

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+workspace(name = "pesto")

pesto.bzl

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+# Copyright 2019 The Bazel Authors. All rights reserved.
+#
+# 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 _resolver_rule_impl(repository_ctx):
+    """Repository rule implementation that invokes dependency resolver."""
+    spec_path = repository_ctx.path(repository_ctx.attr._main_spec_file)
+    resolver_path = repository_ctx.path(repository_ctx.attr._resolver_script)
+
+    # Create a BUILD file next to where the bzl files are created, to
+    # create a Bazel package through which to load the bzl files.
+    repository_ctx.file("BUILD", "# I am a teapot, short and stout. Don't touch me")
+
+    result = repository_ctx.execute([resolver_path, spec_path])
+    if result.return_code != 0:
+        fail("Error while running pesto:\nstdout: {stdout}\nstderr: {stderr}".format(
+            stdout = result.stdout,
+            stderr = result.stderr,
+        ))
+
+_resolver_rule = repository_rule(
+    implementation = _resolver_rule_impl,
+    attrs = {
+        "_main_spec_file": attr.label(
+            allow_single_file = True,
+            default = Label("@//:bazel_spec.json")
+        ),
+        "_resolver_script": attr.label(
+            allow_single_file = True,
+            default = Label("@pesto//:pesto.py"),
+        ),
+    },
+)
+
+def pesto_setup():
+    """Macro to hide the declaration of the repository rule."""
+    _resolver_rule(name = "pesto_generated")