Working through https://bazel.build/rules/rules-tutorial

Author: rwgk

bazel/WORKSPACE

@@ -0,0 +1 @@
+# Marker that this folder is the root of a Bazel workspace.

bazel/rules_tutorial/BUILD

@@ -0,0 +1,14 @@
+load("//:foo.bzl", "foo_binary")
+
+print("BUILD file")
+
+foo_binary(
+    name = "bin1",
+    username = "x",
+)
+
+foo_binary(
+    name = "bin2",
+    other = ":bin1",
+    username = "y",
+)

bazel/rules_tutorial/WORKSPACE

@@ -0,0 +1,34 @@
+def _foo_binary_impl(ctx):
+    print("analyzing", ctx.label)
+    if ctx.attr.other != None:
+        print("ctx.attr.other.files", ctx.attr.other.files)
+    print("ctx.file.other", ctx.file.other)
+    if ctx.file.other != None:
+        print("dir(ctx.file.other)", dir(ctx.file.other))
+        print("ctx.file.other.basename", ctx.file.other.basename)
+        print("ctx.file.other.dirname", ctx.file.other.dirname)
+        print("ctx.file.other.extension", ctx.file.other.extension)
+        print("ctx.file.other.is_directory", ctx.file.other.is_directory)
+        print("ctx.file.other.is_source", ctx.file.other.is_source)
+        print("ctx.file.other.owner", ctx.file.other.owner)
+        print("ctx.file.other.path", ctx.file.other.path)
+        print("ctx.file.other.root", ctx.file.other.root)
+        print("ctx.file.other.short_path", ctx.file.other.short_path)
+        # print("ctx.file.other.tree_relative_path", ctx.file.other.tree_relative_path)
+
+    out = ctx.actions.declare_file(ctx.label.name)
+    ctx.actions.write(
+        output = out,
+        content = "Hello, %s!\n" % ctx.attr.username,
+    )
+    return [DefaultInfo(files = depset([out]))]
+
+foo_binary = rule(
+    implementation = _foo_binary_impl,
+    attrs = {
+        "username": attr.string(),
+        "other": attr.label(allow_single_file = True),
+    },
+)
+
+print("bzl file evaluation")