Add gradle build files

- First set of changes for introduction of a gradle build.
- Relates spring-projects#470

Author: jvalkeal

.gitignore

@@ -3,7 +3,11 @@
 .settings/
 
 target/
+build/
+bin/
+.jfrog/
 
+.gradle
 .idea/
 *.iml
 *.ipr

build.gradle

@@ -0,0 +1,32 @@
+plugins {
+	id "base"
+	id 'org.springframework.shell.root'
+}
+
+description = 'Spring Shell'
+
+repositories {
+	maven { url 'https://repo.spring.io/snapshot' }
+	maven { url 'https://repo.spring.io/milestone' }
+	maven { url 'https://repo.spring.io/release' }
+	mavenCentral()
+}
+
+allprojects {
+	group = 'org.springframework.shell'
+
+	repositories {
+		mavenCentral()
+		maven { url 'https://repo.spring.io/release' }
+		if (version.contains('-')) {
+			maven { url "https://repo.spring.io/milestone" }
+		}
+		if (version.endsWith('-SNAPSHOT')) {
+			maven { url "https://repo.spring.io/snapshot" }
+		}
+	}
+
+	configurations.all {
+		resolutionStrategy.cacheChangingModulesFor 1, 'hours'
+	}
+}

buildSrc/build.gradle

@@ -0,0 +1,58 @@
+plugins {
+	id "java-gradle-plugin"
+	id "java"
+}
+
+sourceCompatibility = JavaVersion.VERSION_17
+
+repositories {
+	gradlePluginPortal()
+	mavenCentral()
+	maven { url 'https://repo.spring.io/plugins-release/' }
+	maven { url "https://repo.spring.io/snapshot" }
+}
+
+ext {
+	def propertiesFile = new File(new File("$projectDir").parentFile, "gradle.properties")
+	propertiesFile.withInputStream {
+		def properties = new Properties()
+		properties.load(it)
+		set("springBootVersion", properties["springBootVersion"])
+	}
+}
+
+dependencies {
+	implementation(platform("org.springframework.boot:spring-boot-dependencies:${springBootVersion}"))
+	implementation("org.springframework:spring-core")
+	implementation 'org.asciidoctor:asciidoctor-gradle-jvm:3.3.2'
+	implementation 'org.jfrog.buildinfo:build-info-extractor-gradle:4.29.0'
+}
+
+gradlePlugin {
+	plugins {
+		modulePlugin {
+			id = "org.springframework.shell.module"
+			implementationClass = "org.springframework.shell.gradle.ModulePlugin"
+		}
+		starterPlugin {
+			id = "org.springframework.shell.starter"
+			implementationClass = "org.springframework.shell.gradle.StarterPlugin"
+		}
+		bomPlugin {
+			id = "org.springframework.shell.bom"
+			implementationClass = "org.springframework.shell.gradle.BomPlugin"
+		}
+		docsPlugin {
+			id = "org.springframework.shell.docs"
+			implementationClass = "org.springframework.shell.gradle.DocsPlugin"
+		}
+		distPlugin {
+			id = "org.springframework.shell.root"
+			implementationClass = "org.springframework.shell.gradle.RootPlugin"
+		}
+		samplePlugin {
+			id = "org.springframework.shell.sample"
+			implementationClass = "org.springframework.shell.gradle.SamplePlugin"
+		}
+	}
+}

buildSrc/src/main/java/org/springframework/shell/gradle/ArtifactoryConventions.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright 2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.shell.gradle;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.gradle.api.Project;
+import org.gradle.api.Task;
+import org.gradle.api.plugins.PluginManager;
+import org.jfrog.build.extractor.clientConfiguration.ArtifactSpec;
+import org.jfrog.build.extractor.clientConfiguration.ArtifactSpecs;
+import org.jfrog.gradle.plugin.artifactory.ArtifactoryPlugin;
+import org.jfrog.gradle.plugin.artifactory.task.ArtifactoryTask;
+
+/**
+ * @author Janne Valkealahti
+ */
+public class ArtifactoryConventions {
+
+	void apply(Project project) {
+		PluginManager pluginManager = project.getPluginManager();
+		pluginManager.apply(ArtifactoryPlugin.class);
+
+		project.getPlugins().withType(ArtifactoryPlugin.class, artifactory -> {
+			Task task = project.getTasks().findByName(ArtifactoryTask.ARTIFACTORY_PUBLISH_TASK_NAME);
+			if (task != null) {
+				ArtifactoryTask aTask = (ArtifactoryTask) task;
+				aTask.setCiServerBuild();
+				// bom is not a java project so plugin doesn't
+				// add defaults for publications.
+				aTask.publications("mavenJava");
+				aTask.publishConfigs("archives");
+
+				// plugin is difficult to work with, use this hack
+				// to set props before task does its real work
+				task.doFirst(t -> {
+					// this needs mods if we ever have zips other than
+					// docs zip having asciidoc/javadoc.
+					ArtifactoryTask at = (ArtifactoryTask) t;
+					ArtifactSpecs artifactSpecs = at.getArtifactSpecs();
+					Map<String, String> propsMap = new HashMap<>();
+					propsMap.put("zip.deployed", "false");
+					propsMap.put("zip.type", "docs");
+					ArtifactSpec spec = ArtifactSpec.builder()
+						.artifactNotation("*:*:*:*@zip")
+						// archives is manually set for zip in root plugin
+						.configuration("archives")
+						.properties(propsMap)
+						.build();
+					artifactSpecs.add(spec);
+				});
+			}
+		});
+	}
+}

buildSrc/src/main/java/org/springframework/shell/gradle/BomPlugin.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright 2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.shell.gradle;
+
+import org.gradle.api.Plugin;
+import org.gradle.api.Project;
+import org.gradle.api.artifacts.dsl.DependencyConstraintHandler;
+import org.gradle.api.plugins.JavaPlatformPlugin;
+import org.gradle.api.plugins.PluginManager;
+
+/**
+ * @author Janne Valkealahti
+ */
+class BomPlugin implements Plugin<Project> {
+
+	@Override
+	public void apply(Project project) {
+		PluginManager pluginManager = project.getPluginManager();
+		pluginManager.apply(SpringMavenPlugin.class);
+		pluginManager.apply(JavaPlatformPlugin.class);
+		new ArtifactoryConventions().apply(project);
+
+		// bom should have main shell modules and starters
+		DependencyConstraintHandler constraints = project.getDependencies().getConstraints();
+		project.getRootProject().getAllprojects().forEach(p -> {
+			p.getPlugins().withType(ModulePlugin.class, m -> {
+				constraints.add("api", p);
+			});
+			p.getPlugins().withType(StarterPlugin.class, m -> {
+				constraints.add("api", p);
+			});
+		});
+	}
+}