Merge from staging repo to release v4.0.0 (#191)

Replaced legacy implementation with new one implemented from scratch.

BREAKING CHANGE: This version drop support for `emacs` reporting and `sourceSets` property in extension. It also changed the name of package, to avoid mixing with legacy implementation.

.githooks/.gitignore

@@ -0,0 +1,20 @@
+applypatch-msg
+commit-msg
+post-applypatch
+post-commit
+post-merge
+post-receive
+post-rewrite
+post-update
+pre-applypatch
+pre-auto-gc
+pre-commit
+pre-merge-commit
+pre-push
+pre-rebase
+pre-receive
+prepare-commit-msg
+push-to-checkout
+sendemail-validate
+update
+husky.*

.githooks/post-checkout

@@ -0,0 +1,23 @@
+#!/bin/sh
+
+# This script installs the development toolchain runs on node.js (commitlint, husky, prettier, etc.).
+# It helps Java engineers to set up full development toolchain seamless.
+#
+# Gradle plugin (ghooks.gradle) will install this git-hook script.
+# We use `post-checkout` because `pre-commit` is used by husky to lint code, and
+# `post-clone` is still unofficial so we have no other hook runs before the commit.
+
+set -e
+
+if [ ! -d "node_modules" ]
+then
+  if [ -x "$(command -v yarn)" ]
+  then
+    echo "🔍🐛 node_modules directory not found, running `yarn install` to install the dev toolchain..."
+    yarn install
+    echo "🔍🐛 The dev toolchain has been installed."
+  else
+    echo "🔍🐛 The yarn command not found. Please install it to keep your commit clean:"
+    echo "🔍🐛 https://yarnpkg.com/en/docs/install"
+  fi
+fi

.github/CONTRIBUTING.md

@@ -0,0 +1,40 @@
+# Contributing Guideline
+
+## How to hack this project
+
+Make sure you have Java 11+, Node.js 12+ and NPM on your `PATH`.
+
+Before you start hacking, run `npm install` once to install development toolchain
+to follow [the Conventional Commits](https://conventionalcommits.org/).
+
+To build the implementation and test, run `./gradlew` then it runs all necessary formatter, compile and test.
+
+## How to use latest plugin in your project
+
+To test your changes, you need to build and install the plugin by your own.
+
+To install the plugin into your Maven Local Repository, add `apply plugin: 'maven-publish'` to `build.gradle` and run `./gradlew publishToMavenLocal`. Then you can use the installed plugin like below:
+
+```groovy
+buildscript {
+  repositories {
+    maven {
+      url "https://plugins.gradle.org/m2/"
+    }
+    mavenLocal()
+  }
+  dependencies {
+    classpath "com.github.spotbugs.snom:spotbugs-gradle-plugin:(YOUR_VERSION)"
+  }
+}
+
+apply plugin: "com.github.spotbugs.snom"
+```
+
+## Before reporting a problem
+
+When you find problems and want to share with the community, consider to add some JUnit test cases to reproduce.
+Just two steps to follow:
+
+1. Create a [minimum and complete](http://stackoverflow.com/help/mcve) project, and reproduce it by [functional testing](https://guides.gradle.org/testing-gradle-plugins/). The test code is located in `src/functionalTest` directory.
+2. Confirm that `./gradlew clean build` fails by the newly added test case.

.github/FUNDING.yml

@@ -0,0 +1 @@
+github: [KengoTODA]

.github/auto-merge.yml

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+minApprovals:
+  NONE: 0
+requiredLabels:
+  - dependencies
+updateBranch: true
+mergeMethod: rebase

.github/workflows/gradle.yml

@@ -0,0 +1,63 @@
+name: Java CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        gradle: ['5.6', '6.0', '6.1', '6.2']
+    steps:
+    - uses: actions/checkout@722adc6
+      with:
+        fetch-depth: 0
+    - name: Set up JDK 11
+      uses: actions/setup-java@081536e
+      with:
+        java-version: 11
+    - name: Set up Node.js 12
+      uses: actions/setup-node@8de2f9f
+      with:
+        node-version: 12
+    - uses: actions/cache@cffae95
+      with:
+        path: ~/.gradle/caches
+        key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
+        restore-keys: |
+          ${{ runner.os }}-gradle-
+    - name: Gradle Wrapper Validation
+      uses: gradle/wrapper-validation-action@v1
+    - name: Build with Gradle
+      run: ./gradlew build --no-daemon -Dsnom.test.functional.gradle=${{ matrix.gradle }}
+    - name: Run Semantic Release
+      run: |
+        echo "gradle.publish.key=${{ secrets.GRADLE_PUBLISH_KEY }}" > ~/.gradle/gradle.properties
+        echo "gradle.publish.secret=${{ secrets.GRADLE_PUBLISH_SECRET }}" >> ~/.gradle/gradle.properties
+        rm -rf build/libs/*.jar
+        npm ci
+        npm run semantic-release
+      if: matrix.gradle == '6.0'
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    - name: Run SonarQube Scanner
+      run: |
+        if [ "$SONAR_LOGIN" != "" ]; then
+          ./gradlew sonarqube -Dsonar.login=$SONAR_LOGIN --no-daemon
+        fi
+      if: matrix.gradle == '6.0'
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        SONAR_LOGIN: ${{ secrets.SONAR_LOGIN }}
+    - uses: actions/upload-artifact@3446296
+      if: always()
+      with:
+        name: reports
+        path: build/reports

.github/workflows/javadoc.yml

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+name: Javadoc
+on:
+  push:
+    branches:
+      - master
+jobs:
+  javadoc:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@af513c7
+      - name: Set up JDK 11
+        uses: actions/setup-java@081536e
+        with:
+          java-version: 11
+      - name: Set up Node.js 12
+        uses: actions/setup-node@8de2f9f
+        with:
+          node-version: 12
+      - name: Generate Groovydoc
+        run: ./gradlew groovydoc
+      - name: Prepare to Deploy
+        run: |
+          npm ci
+          rm -f .git/hooks/commit-msg
+      - name: Deploy
+        uses: JamesIves/github-pages-deploy-action@c74c1d2
+        with:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          BRANCH: gh-pages
+          FOLDER: build/docs/groovydoc/