Migrate to Gradle (#1159)

* Start gradle root

* Clean up test API ambiguities

These don't compile in gradle anymore and the team[] warns

* Exclude .gradle dirs in git

* Set up moshi module

* Set up moshi-adapters

* Add repositories to subprojects

* Set target/source compatibility

* Set up examples

* Fix location of reflect/test dir

* Set up moshi-kotlin

* Set up code gen

* Opportunistic update code gen deps

* Fix up with code gen

* Set up kotlin tests

* Update snapshots

* Update travis build

* Configure checkstyle

* Cache gradle

* Finish fixing up checkstyle

* Now disable checkstyle until we can fix them all :|

* Update contributing

* Fix tests in codegen

* Remove unnecessary annotation

* Remove maven stuff!

* Suppress warning

* Remove jcenter

* Consolidate dependencies

* Revert "Clean up test API ambiguities"

This reverts commit 3ead69b844b5d7f66134b721e95581f5df1cccd6.

* Fix incap dep

* Opportunistically fix some small kotlinpoet deprecations

* Automatically apply the stdlib to all kotlin projects

* Opportunistic move to opt-in and remove unnecessary annotations

The kotlin maven plugin didn't handle these well in the IDE, gradle does

* Fix Type doc warning

* Fix okio version

* Fix dokka support

* Fix copypasta

* Use new snapshot

* Kotlin 1.4.0

kotlin/codegen/src/assembly/dokka.xml

@@ -1,16 +0,0 @@
-<assembly
-    xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.3"
-    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.3 http://maven.apache.org/xsd/assembly-1.1.3.xsd">
-  <id>javadoc</id>
-  <formats>
-    <format>jar</format>
-  </formats>
-  <baseDirectory>/</baseDirectory>
-  <fileSets>
-    <fileSet>
-      <directory>target/dokka/moshi-kotlin-codegen</directory>
-      <outputDirectory>/</outputDirectory>
-    </fileSet>
-  </fileSets>
-</assembly>

kotlin/codegen/src/main/java/com/squareup/moshi/kotlin/codegen/JsonClassCodegenProcessor.kt

@@ -19,7 +19,6 @@ import com.google.auto.service.AutoService
 import com.squareup.kotlinpoet.AnnotationSpec
 import com.squareup.kotlinpoet.asClassName
 import com.squareup.kotlinpoet.classinspector.elements.ElementsClassInspector
-import com.squareup.kotlinpoet.metadata.KotlinPoetMetadataPreview
 import com.squareup.moshi.JsonClass
 import com.squareup.moshi.kotlin.codegen.api.AdapterGenerator
 import com.squareup.moshi.kotlin.codegen.api.PropertyGenerator
@@ -45,7 +44,6 @@ import javax.tools.Diagnostic
  * The generated class will match the visibility of the given data class (i.e. if it's internal, the
  * adapter will also be internal).
  */
-@KotlinPoetMetadataPreview
 @AutoService(Processor::class)
 @IncrementalAnnotationProcessor(ISOLATING)
 class JsonClassCodegenProcessor : AbstractProcessor() {

kotlin/codegen/src/main/java/com/squareup/moshi/kotlin/codegen/metadata.kt

@@ -45,6 +45,7 @@ import com.squareup.moshi.kotlin.codegen.api.TargetParameter
 import com.squareup.moshi.kotlin.codegen.api.TargetProperty
 import com.squareup.moshi.kotlin.codegen.api.TargetType
 import com.squareup.moshi.kotlin.codegen.api.mapTypes
+import com.squareup.moshi.kotlin.codegen.api.rawType
 import java.lang.annotation.ElementType
 import java.lang.annotation.Retention
 import java.lang.annotation.RetentionPolicy
@@ -365,7 +366,7 @@ private fun declaredProperties(
   return result
 }
 
-private val TargetProperty.isTransient get() = propertySpec.annotations.any { it.className == Transient::class.asClassName() }
+private val TargetProperty.isTransient get() = propertySpec.annotations.any { it.typeName == Transient::class.asClassName() }
 private val TargetProperty.isSettable get() = propertySpec.mutable || parameter != null
 private val TargetProperty.isVisible: Boolean
   get() {
@@ -406,19 +407,20 @@ internal fun TargetProperty.generator(
   // Merge parameter and property annotations
   val qualifiers = parameter?.qualifiers.orEmpty() + propertySpec.annotations.qualifiers(elements)
   for (jsonQualifier in qualifiers) {
+    val qualifierRawType = jsonQualifier.typeName.rawType()
     // Check Java types since that covers both Java and Kotlin annotations.
-    val annotationElement = elements.getTypeElement(jsonQualifier.className.canonicalName)
+    val annotationElement = elements.getTypeElement(qualifierRawType.canonicalName)
         ?: continue
     annotationElement.getAnnotation(Retention::class.java)?.let {
       if (it.value != RetentionPolicy.RUNTIME) {
         messager.printMessage(ERROR,
-            "JsonQualifier @${jsonQualifier.className.simpleName} must have RUNTIME retention")
+            "JsonQualifier @${qualifierRawType.simpleName} must have RUNTIME retention")
       }
     }
     annotationElement.getAnnotation(Target::class.java)?.let {
       if (ElementType.FIELD !in it.value) {
         messager.printMessage(ERROR,
-            "JsonQualifier @${jsonQualifier.className.simpleName} must support FIELD target")
+            "JsonQualifier @${qualifierRawType.simpleName} must support FIELD target")
       }
     }
   }
@@ -436,13 +438,13 @@ internal fun TargetProperty.generator(
 private fun List<AnnotationSpec>?.qualifiers(elements: Elements): Set<AnnotationSpec> {
   if (this == null) return setOf()
   return filterTo(mutableSetOf()) {
-    elements.getTypeElement(it.className.toString()).getAnnotation(JSON_QUALIFIER) != null
+    elements.getTypeElement(it.typeName.toString()).getAnnotation(JSON_QUALIFIER) != null
   }
 }
 
 private fun List<AnnotationSpec>?.jsonName(): String? {
   if (this == null) return null
-  return find { it.className == JSON }?.let { annotation ->
+  return find { it.typeName == JSON }?.let { annotation ->
     val mirror = requireNotNull(annotation.tag<AnnotationMirror>()) {
       "Could not get the annotation mirror from the annotation spec"
     }

kotlin/codegen/src/test/java/com/squareup/moshi/kotlin/codegen/JsonClassCodegenProcessorTest.kt

@@ -15,7 +15,6 @@
  */
 package com.squareup.moshi.kotlin.codegen
 
-import com.squareup.kotlinpoet.metadata.KotlinPoetMetadataPreview
 import com.squareup.moshi.JsonAdapter
 import com.squareup.moshi.JsonReader
 import com.tschuchort.compiletesting.KotlinCompilation
@@ -36,7 +35,6 @@ import kotlin.reflect.full.createType
 import kotlin.reflect.full.declaredMemberProperties
 
 /** Execute kotlinc to confirm that either files are generated or errors are printed. */
-@OptIn(KotlinPoetMetadataPreview::class)
 class JsonClassCodegenProcessorTest {
   @Rule @JvmField var temporaryFolder: TemporaryFolder = TemporaryFolder()