Cobble together a semanticdb plugin

3rdparty/maven.bzl

@@ -878,7 +878,10 @@ def list_dependencies():
             },
             "import_args": {
                 "default_visibility": ["//visibility:public"],
-                "deps": ["@scala_annex_com_lihaoyi_fansi_2_12"],
+                "deps": [
+                    "@scala_annex_com_lihaoyi_fansi_2_12",
+                    "@scala_annex_com_lihaoyi_sourcecode_2_12",
+                ],
                 "jar_sha256": "2e18aa0884870537bf5c562255fc759d4ebe360882b5cb2141b30eda4034c71d",
                 "jar_urls": [
                     "http://central.maven.org/maven2/com/lihaoyi/pprint_2.12/0.5.3/pprint_2.12-0.5.3.jar",
@@ -895,6 +898,7 @@ def list_dependencies():
         # duplicates in com.lihaoyi:sourcecode_2.12 promoted to 0.1.4
         # - ch.epfl.scala:bloop-backend_2.12:1.0.0 wanted version 0.1.4
         # - com.lihaoyi:fastparse_2.12:0.4.2 wanted version 0.1.3
+        # - com.lihaoyi:pprint_2.12:0.5.3 wanted version 0.1.4
         {
             "bind_args": {
                 "actual": "@scala_annex_com_lihaoyi_sourcecode_2_12",
@@ -2462,6 +2466,30 @@ def list_dependencies():
             },
             "lang": "java",
         },
+        {
+            "bind_args": {
+                "actual": "@scala_annex_org_scalameta_semanticdb_scalac_2_12_7",
+                "name": "jar/scala_annex_org/scalameta/semanticdb_scalac_2_12_7",
+            },
+            "import_args": {
+                "default_visibility": ["//visibility:public"],
+                "deps": [
+                    "@scala_annex_com_lihaoyi_pprint_2_12",
+                    "@scala_annex_scala_2_12_scala_library//jar",
+                ],
+                "jar_sha256": "62be6eb517912026e8824f95533a1ed4ae7c886bab5d266ee39ca98dd416a4dc",
+                "jar_urls": [
+                    "http://central.maven.org/maven2/org/scalameta/semanticdb-scalac_2.12.7/4.0.0/semanticdb-scalac_2.12.7-4.0.0.jar",
+                ],
+                "licenses": ["notice"],
+                "name": "scala_annex_org_scalameta_semanticdb_scalac_2_12_7",
+                "srcjar_sha256": "91970337ec5b6cc5ad0ae0162c452f1bb4a77bf1880644235dc8e62fa3dfd694",
+                "srcjar_urls": [
+                    "http://central.maven.org/maven2/org/scalameta/semanticdb-scalac_2.12.7/4.0.0/semanticdb-scalac_2.12.7-4.0.0-sources.jar",
+                ],
+            },
+            "lang": "java",
+        },
         {
             "bind_args": {
                 "actual": "@scala_annex_org_scalatest_scalatest_2_12",

dependencies.yaml

@@ -19,6 +19,11 @@ dependencies:
       modules: ["frontend"]
       version: "1.0.0"
 
+  org.scalameta:
+    semanticdb-scalac_2.12.7:
+      lang: java
+      version: "4.0.0"
+
   net.sourceforge.argparse4j:
     argparse4j:
       lang: java

rules/scala/private/phases.bzl

@@ -15,6 +15,7 @@ def run_phases(ctx, phases):
     sdeps = java_common.merge(_collect(JavaInfo, scala_configuration.runtime_classpath + ctx.attr.deps))
     init = struct(
         scala_configuration = scala_configuration,
+        scalacopts = ctx.attr.scalacopts[:],
         # todo: probably can remove this from init
         sdeps = sdeps,
     )
@@ -109,6 +110,8 @@ def phase_compile(ctx, g):
 
     splugins = java_common.merge(_collect(JavaInfo, ctx.attr.plugins + g.init.scala_configuration.global_plugins))
 
+    print(splugins.transitive_runtime_deps.to_list())
+
     zinc_configuration = ctx.attr.scala[_ZincConfiguration]
 
     srcs = [file for file in ctx.files.srcs if file.extension.lower() in ["java", "scala"]]
@@ -138,12 +141,13 @@ def phase_compile(ctx, g):
 
     zincs = [dep[_ZincInfo] for dep in ctx.attr.deps if _ZincInfo in dep]
 
+    scalacopts = runner.scalacopts + g.init.scalacopts
     args = ctx.actions.args()
     args.add_all(depset(transitive = [zinc.deps for zinc in zincs]), map_each = _compile_analysis)
     args.add("--compiler_bridge", zinc_configuration.compiler_bridge)
     args.add_all("--compiler_classpath", g.init.scala_configuration.compiler_classpath)
     args.add_all("--classpath", compile_classpath)
-    args.add_all(runner.scalacopts + ctx.attr.scalacopts, format_each = "--compiler_option=%s")
+    args.add_all(scalacopts, format_each = "--compiler_option=%s")
     args.add_all(javacopts, format_each = "--java_compiler_option=%s")
     args.add(ctx.label, format = "--label=%s")
     args.add("--main_manifest", mains_file)

rules/semanticdb/BUILD

@@ -0,0 +1,16 @@
+load("@rules_scala_annex//rules:scala.bzl", "scala_library")
+load(
+    ":private.bzl",
+    _make_semanticdb_plugin = "make_semanticdb_plugin",
+)
+
+scala_library(
+    name = "lib",
+    scala = "//external:scala_annex_scala",
+)
+
+_make_semanticdb_plugin(
+    name = "2_12_7",
+    dep = "@scala_annex_org_scalameta_semanticdb_scalac_2_12_7",
+    visibility = ["//visibility:public"],
+)

rules/semanticdb/private.bzl

@@ -0,0 +1,49 @@
+load(
+    "@rules_scala_annex//rules:providers.bzl",
+    _ScalaRulePhase = "ScalaRulePhase",
+)
+
+SemanticDB = provider(
+    doc = "Scala SemanticDB output",
+    fields = {
+        "output": "the semanticdb file",
+    },
+)
+
+def _phase_semanticdb_before_compile(ctx, g):
+    print("semanticdb before compile phase")
+    g.init.scalacopts.extend([
+        "-Xplugin-require:semanticdb",
+        "-Yrangepos",
+        #"-P:semanticdb:targetroot:~/Desktop/foo",
+    ])
+
+def _phase_semanticdb_after_compile(ctx, g):
+    print("semanticdb after compile phase")
+
+    g.out.providers.append(SemanticDB(
+        output = None,
+    ))
+
+def _my_plugin_implementation(ctx):
+    # TODO: write something intelligent that allows us to pass along
+    # all providers from the underlying dep
+    return [
+        ctx.attr.dep[JavaInfo],
+        _ScalaRulePhase(
+            phases = [
+                ("-", "compile", "semanticdb", _phase_semanticdb_before_compile),
+                ("+", "compile", "semanticdb", _phase_semanticdb_after_compile),
+            ],
+        ),
+    ]
+
+make_semanticdb_plugin = rule(
+    attrs = {
+        "dep": attr.label(
+            mandatory = True,
+            providers = [JavaInfo],
+        ),
+    },
+    implementation = _my_plugin_implementation,
+)

tests/WORKSPACE

@@ -38,7 +38,7 @@ scala_repository(
 
 scala_repository(
     "scala_2_12",
-    ("org.scala-lang", "2.12.6"),
+    ("org.scala-lang", "2.12.7"),
     "@compiler_bridge_2_12//:src",
 )
 

tests/semanticdb/BUILD

@@ -0,0 +1,12 @@
+load("@rules_scala_annex//rules:scala.bzl", "configure_scala", "scala_library")
+load(":rules.bzl", "my_plugin")
+
+scala_library(
+    name = "input",
+    srcs = ["input.scala"],
+    plugins = [
+        "@rules_scala_annex//rules/semanticdb:2_12_7",
+    ],
+    scala = "@scala_2_12",
+    tags = ["manual"],
+)

tests/semanticdb/input.scala

@@ -0,0 +1,5 @@
+package anx
+
+object Foo
+
+object Bar

tests/semanticdb/plugin.scala

@@ -0,0 +1,3 @@
+package annex
+
+object Plugin

tests/semanticdb/rules.bzl

@@ -0,0 +1,41 @@
+load(
+    "@rules_scala_annex//rules:providers.bzl",
+    _ScalaRulePhase = "ScalaRulePhase",
+)
+
+def _foo_before_javainfo(ctx, g):
+    if hasattr(g, "javainfo"):
+        fail("javainfo shouldn't be in the globals, yet")
+
+def _foo_after_javainfo(ctx, g):
+    if not hasattr(g, "javainfo"):
+        fail("javainfo should be in the globals by now")
+
+def _foo_after_coda(ctx, g):
+    if not hasattr(g, "compile"):
+        fail("expected to run after compilation")
+
+    print("plugin phase success")
+
+def _my_plugin_implementation(ctx):
+    sdeps = java_common.merge([dep[JavaInfo] for dep in ctx.attr.deps])
+    return [
+        sdeps,
+        _ScalaRulePhase(
+            phases = [
+                ("-", "javainfo", "foo_before_javainfo", _foo_before_javainfo),
+                ("+", "javainfo", "foo_after_javainfo", _foo_after_javainfo),
+                ("+", "coda", "foo_after_coda", _foo_after_coda),
+            ],
+        ),
+    ]
+
+my_plugin = rule(
+    attrs = {
+        "deps": attr.label_list(
+            mandatory = True,
+            providers = [JavaInfo],
+        ),
+    },
+    implementation = _my_plugin_implementation,
+)

tests/semanticdb/test

@@ -0,0 +1,4 @@
+#!/bin/bash -e
+. "$(dirname "$0")"/../common.sh
+
+bazel build :input

tests/semanticdb/usage.scala

@@ -0,0 +1,3 @@
+package anx
+
+object Usage