Merge pull request #6014 from mwoehlke-kitware/generate-drake-config-…

…from-cps

Generate Drake exports from CPS

WORKSPACE

@@ -289,6 +289,22 @@ github_archive(
     sha256 = "0a0ae63cbffc274efb573bdde9a253e3f32e458c41261df51c5dbc5ad541e8f7",
 )
 
+pypi_archive(
+    name = "semantic_version",
+    version = "2.6.0",
+    sha256 = "2a4328680073e9b243667b201119772aefc5fc63ae32398d6afafff07c4f54c0",
+    build_file = "tools/semantic_version.BUILD",
+    strip_prefix = "semantic_version",
+)
+
+github_archive(
+    name = "pycps",
+    repository = "mwoehlke/pycps",
+    commit = "1b985467d1fe737ed3a43a25f4da3316bd45106f",
+    sha256 = "4491debd18ee40bf9d7eab9b35776eff98a71bc904a339f709273cbad9ac6efb",
+    build_file = "tools/pycps.BUILD",
+)
+
 # The "@python_headers//:python_headers" target is required by protobuf
 # during "bazel query" but not "bazel build", so a stub is fine.
 new_local_repository(

tools/BUILD

@@ -40,6 +40,15 @@ alias(
     actual = "@com_github_bazelbuild_buildtools//buildifier",
 )
 
+genrule(
+    name = "cmake_exports",
+    srcs = ["drake.cps"],
+    outs = ["drake-config.cmake"],
+    cmd = "$(location @pycps//:cps2cmake_executable) $(location drake.cps) > \"$@\"",
+    tools = ["@pycps//:cps2cmake_executable"],
+    visibility = ["//visibility:private"],
+)
+
 # This pulls the otherwise-unused libbot targets into the "//..." label tree.
 genrule(
     name = "force_libbot",

tools/drake.bzl

@@ -220,3 +220,15 @@ def drake_header_tar(name, deps=[], **kwargs):
           mode="0644",
           files=[":" + name + "_gather"],
           strip_prefix="/")
+
+# Generate a file with specified content
+def _generate_file_impl(ctx):
+  ctx.file_action(output=ctx.outputs.out, content=ctx.attr.content)
+
+drake_generate_file = rule(
+  implementation = _generate_file_impl,
+  attrs = {
+    "content": attr.string(),
+    "out": attr.output(mandatory = True),
+  },
+)

tools/drake.cps

@@ -3,6 +3,7 @@
   "Meta-Schema": "https://mwoehlke.github.io/cps/",
   "X-Purpose": "Used to generate drake-config.cmake via cps2cmake",
   "X-See-Also": "https://github.com/mwoehlke/pycps",
+  "Cps-Version": "0.8.0",
   "Name": "drake",
   "Website": "http://drake.mit.edu/",
   "Components": {

tools/lcm.BUILD

@@ -1,5 +1,7 @@
 # -*- python -*-
 
+load("@//tools:drake.bzl", "drake_generate_file")
+
 package(default_visibility = ["//visibility:public"])
 
 # In LCM's upstream build system lcm_export.h is generated by CMake and
@@ -145,11 +147,10 @@ cc_binary(
 # To repair this, we provide our own init file at the root of the sandbox that
 # overrides the Bazel empty default.  Its implementation just delegates to the
 # lcm-python init file.
-genrule(
+drake_generate_file(
     name = "init_genrule",
-    srcs = [],
-    outs = ["__init__.py"],
-    cmd = "echo 'execfile(__path__[0] + \"/lcm-python/lcm/__init__.py\")' > $@",
+    out = "__init__.py",
+    content = "execfile(__path__[0] + \"/lcm-python/lcm/__init__.py\")",
 )
 
 py_library(

tools/package_drake.sh

@@ -23,7 +23,6 @@ function canonicalize
 # Copy source artifacts to specified install prefix.
 function copy_source_artifacts
 {
-  cp tools/drake-config.cmake "$1/lib/cmake/drake/"
   cp LICENSE.TXT "$1/"
 }
 
@@ -32,6 +31,7 @@ function copy_source_artifacts
 function copy_build_artifacts
 {
   cp bazel-bin/drake/libdrake.so "$1/lib/"
+  cp bazel-genfiles/tools/drake-config.cmake "$1/lib/cmake/drake/"
 }
 
 #------------------------------------------------------------------------------

tools/pycps.BUILD

@@ -0,0 +1,21 @@
+genrule(
+  name = "copy_cps2cmake",
+  srcs = ["cps2cmake"],
+  outs = ["cps2cmake.py"],
+  cmd = "cp \"$<\" \"$(@)\"",
+)
+
+py_library(
+  name = "cps",
+  srcs = ["cps.py"],
+  deps = ["@semantic_version//:semantic_version"],
+  visibility = ["//visibility:private"], # LGPL; don't use externally
+)
+
+py_binary(
+  name = "cps2cmake_executable",
+  srcs = ["cps2cmake.py"],
+  main = "cps2cmake.py",
+  deps = [":cps"],
+  visibility = ["//visibility:public"],
+)

tools/semantic_version.BUILD

@@ -0,0 +1,7 @@
+load("@//tools:drake.bzl", "drake_generate_file")
+
+py_library(
+  name = "semantic_version",
+  srcs = glob(["*.py"]),
+  visibility = ["//visibility:public"],
+)