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authorVincent Ambo <tazjin@google.com>2019-07-04T10·18+0100
committerVincent Ambo <tazjin@google.com>2019-07-04T10·18+0100
commitf723b8b878a3c4a4687b9e337a875500bebb39b1 (patch)
treee85204cf042c355e90cff61c111e7d8cd15df311 /third_party/bazel/rules_haskell/haskell/private/java.bzl
parent2eb1dc26e42ffbdc168f05ef744bd4b4f3e4c36f (diff)
feat(third_party/bazel): Check in rules_haskell from Tweag r/17
Diffstat (limited to 'third_party/bazel/rules_haskell/haskell/private/java.bzl')
-rw-r--r--third_party/bazel/rules_haskell/haskell/private/java.bzl48
1 files changed, 48 insertions, 0 deletions
diff --git a/third_party/bazel/rules_haskell/haskell/private/java.bzl b/third_party/bazel/rules_haskell/haskell/private/java.bzl
new file mode 100644
index 000000000000..44c4e114d7ba
--- /dev/null
+++ b/third_party/bazel/rules_haskell/haskell/private/java.bzl
@@ -0,0 +1,48 @@
+"""Interop with Java."""
+
+load("@bazel_skylib//lib:collections.bzl", "collections")
+
+JavaInteropInfo = provider(
+    doc = "Information needed for interop with Java rules.",
+    fields = {
+        "inputs": "Files needed during build.",
+        "env": "Dict with env variables that should be set during build.",
+    },
+)
+
+def java_interop_info(ctx):
+    """Gather information from any Java dependencies.
+
+    Args:
+      ctx: Rule context.
+
+    Returns:
+      JavaInteropInfo: Information needed for Java interop.
+    """
+
+    inputs = depset(
+        transitive = [
+            # We only expose direct dependencies, though we could
+            # expose transitive ones as well. Only exposing the direct
+            # ones corresponds to Bazel's "strict Java dependencies"
+            # mode. See
+            # https://github.com/tweag/rules_haskell/issues/96.
+            dep[JavaInfo].compile_jars
+            for dep in ctx.attr.deps
+            if JavaInfo in dep
+        ],
+    )
+
+    env_dict = dict()
+    uniq_classpath = collections.uniq([
+        f.path
+        for f in inputs
+    ])
+
+    if len(uniq_classpath) > 0:
+        env_dict["CLASSPATH"] = ":".join(uniq_classpath)
+
+    return JavaInteropInfo(
+        inputs = inputs,
+        env = env_dict,
+    )