Create spring boot starter with spring factory

gradle.properties

@@ -10,6 +10,7 @@ jlineVersion        = 2.14.6
 jline3Version       = 3.9.0
 junitDepVersion     = 4.11
 junitVersion        = 4.12
+springBootVersion   = 2.1.6.RELEASE
 
 # projectPreviousReleaseVersion is non-SNAPSHOT, only published releases
 projectPreviousReleaseVersion = 4\\.0\\.0-beta-2
@@ -20,4 +21,4 @@ projectVersion                = 4.0.0-rc-1-SNAPSHOT
 releaseDate              = 2019-06-20
 releaseDatePreviousRegex = 2019\\-06\\-20
 
-systemRulesVersion = 1.17.1
+systemRulesVersion = 1.17.1

picocli-spring-boot-autoconfigure/build.gradle

@@ -0,0 +1,19 @@
+plugins {
+    id 'java'
+}
+
+group 'info.picocli'
+version '4.0.0-rc-1-SNAPSHOT'
+
+sourceCompatibility = 1.8
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    compile rootProject
+    compile (group: 'org.springframework.boot', name: 'spring-boot-starter', version: "$springBootVersion" )
+    compileOnly("org.springframework.boot:spring-boot-configuration-processor:$springBootVersion")
+    testCompile group: 'junit', name: 'junit', version: '4.12'
+}

picocli-spring-boot-autoconfigure/src/main/java/picocli/spring/boot/autoconfigure/PicocliAutoConfiguration.java

@@ -0,0 +1,24 @@
+package picocli.spring.boot.autoconfigure;
+
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import picocli.CommandLine;
+
+/**
+ * @author Thibaud Leprêtre
+ */
+@Configuration
+@ConditionalOnClass(CommandLine.class)
+public class PicocliAutoConfiguration {
+
+    @Bean
+    @ConditionalOnMissingBean(CommandLine.IFactory.class)
+    CommandLine.IFactory springPicocliFactory(ApplicationContext applicationContext) {
+        return new SpringPicocliFactory(applicationContext);
+    }
+
+
+}

picocli-spring-boot-autoconfigure/src/main/java/picocli/spring/boot/autoconfigure/SpringPicocliFactory.java

@@ -0,0 +1,37 @@
+package picocli.spring.boot.autoconfigure;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.context.ApplicationContext;
+import picocli.CommandLine;
+
+/**
+ * @author Thibaud Leprêtre
+ */
+public class SpringPicocliFactory implements CommandLine.IFactory {
+    private static final Logger logger = LoggerFactory.getLogger(SpringPicocliFactory.class);
+
+    private final ApplicationContext applicationContext;
+
+    public SpringPicocliFactory(ApplicationContext applicationContext) {
+        this.applicationContext = applicationContext;
+    }
+
+    @Override
+    public <K> K create(Class<K> clazz) throws Exception {
+        try {
+            return getBeanOrCreate(clazz);
+        } catch (Exception e) {
+            logger.warn("unable to get bean of class {}, use default Picocli factory creation", clazz);
+            return CommandLine.defaultFactory().create(clazz);
+        }
+    }
+
+    private <K> K getBeanOrCreate(Class<K> clazz) {
+        try {
+            return applicationContext.getBean(clazz);
+        } catch (Exception e) {
+            return applicationContext.getAutowireCapableBeanFactory().createBean(clazz);
+        }
+    }
+}

picocli-spring-boot-starter/build.gradle

@@ -0,0 +1,17 @@
+plugins {
+    id 'java'
+}
+
+group 'info.picocli'
+version '4.0.0-rc-1-SNAPSHOT'
+
+sourceCompatibility = 1.8
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    compile (group: 'org.springframework.boot', name: 'spring-boot-starter', version: '2.1.6.RELEASE' )
+    compileOnly("org.springframework.boot:spring-boot-configuration-processor:2.1.6.RELEASE")
+}

picocli-spring-boot-starter/src/main/resources/META-INF/spring.provides

@@ -0,0 +1 @@
+provides: picocli

settings.gradle

@@ -10,3 +10,6 @@ if (org.gradle.api.JavaVersion.current().isJava8Compatible()) {
 } else {
     println("Excluding module picocli-annotation-processing-tests from the build: they require Java 8 but we have Java version ${org.gradle.api.JavaVersion.current()}")
 }
+include 'picocli-spring-boot-starter'
+include 'picocli-spring-boot-autoconfigure'
+