First working buck2 rdl gen. lots of mess here still including no support for deps and hard-coded paths

Author: nathanaelhuffman

.buckconfig

@@ -0,0 +1,17 @@
+[repositories]
+root = .
+prelude = prelude
+toolchains = toolchains
+none = none
+
+[repository_aliases]
+config = prelude
+fbcode = none
+fbsource = none
+buck = none
+
+[parser]
+target_platform_detector_spec = target:root//...->prelude//platforms:default
+
+[project]
+ignore = .git

.buckroot

@@ -1,3 +1,6 @@
 [submodule "vnd/cobalt"]
 	path = vnd/cobalt
 	url = git@github.com:oxidecomputer/cobalt.git
+[submodule "prelude"]
+	path = prelude
+	url = https://github.com/facebook/buck2-prelude.git

.gitmodules

@@ -0,0 +1,11 @@
+load(":rdl.bzl", "rdl_file", "rdl_gen")
+rdl_file(
+    name = "gimlet_regs_rdl",
+    src = "gimlet_seq_fpga_regs.rdl"
+)
+
+rdl_gen(
+   name = "rdl_test",
+   srcs = [":gimlet_regs_rdl"],
+   outputs = ["test_pkg.vhd", "test.html"]
+)

BUCK

@@ -0,0 +1,32 @@
+def _rdl_file_impl(ctx):
+    return [DefaultInfo(default_output=ctx.attrs.src.without_associated_artifacts())]
+
+rdl_file = rule(
+    impl = _rdl_file_impl,
+    attrs = {
+        "src": attrs.source()
+    }
+)
+
+def _rdl_gen_impl(ctx):
+    outs = [ctx.actions.declare_output(out) for out in ctx.attrs.outputs]
+    print(ctx.attrs.srcs)
+    ctx.actions.run([
+        "python3", 
+        "../cobalt/tools/site_cobble/rdl_pkg/rdl_cli.py", 
+        "--inputs", [x for x in ctx.attrs.srcs], 
+        "--outputs", [x.as_output() for x in outs],
+        ],
+        category="rdl",
+        
+    )
+
+    return [DefaultInfo(default_outputs=outs)]
+
+rdl_gen = rule(
+    impl = _rdl_gen_impl,
+    attrs = {
+        "srcs": attrs.list(attrs.source()),
+        "outputs": attrs.list(attrs.string())
+    }
+)