Autoconfigure TerminalUI

- Add TerminalUIBuilder which can be used to build TerminalUI
- Add TerminalUICustomizer which can customize TerminalUI
- What is autoconfigured is TerminalUIBuilder.
- In TerminalUI add configure for views which now allows
  easier way to set needed stuff in views.
- Various changes in a catalog app
- Fixes #900

spring-shell-autoconfigure/src/main/java/org/springframework/shell/boot/TerminalUIAutoConfiguration.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2023 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.boot;
+
+import org.jline.terminal.Terminal;
+
+import org.springframework.beans.factory.ObjectProvider;
+import org.springframework.boot.autoconfigure.AutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Scope;
+import org.springframework.shell.component.view.TerminalUI;
+import org.springframework.shell.component.view.TerminalUIBuilder;
+import org.springframework.shell.component.view.TerminalUICustomizer;
+import org.springframework.shell.style.ThemeActive;
+import org.springframework.shell.style.ThemeResolver;
+
+@AutoConfiguration
+@ConditionalOnClass(TerminalUI.class)
+public class TerminalUIAutoConfiguration {
+
+	@Bean
+	@Scope("prototype")
+	@ConditionalOnMissingBean
+	public TerminalUIBuilder terminalUIBuilder(Terminal terminal, ThemeResolver themeResolver, ThemeActive themeActive,
+			ObjectProvider<TerminalUICustomizer> customizerProvider) {
+		TerminalUIBuilder builder = new TerminalUIBuilder(terminal);
+		builder = builder.themeName(themeActive.get());
+		builder = builder.themeResolver(themeResolver);
+		builder = builder.customizers(customizerProvider.orderedStream().toList());
+		return builder;
+	}
+
+}

spring-shell-autoconfigure/src/main/resources/META-INF/spring/org.springframework.boot.autoconfigure.AutoConfiguration.imports

@@ -14,3 +14,4 @@ org.springframework.shell.boot.StandardAPIAutoConfiguration
 org.springframework.shell.boot.ThemingAutoConfiguration
 org.springframework.shell.boot.StandardCommandsAutoConfiguration
 org.springframework.shell.boot.ComponentFlowAutoConfiguration
+org.springframework.shell.boot.TerminalUIAutoConfiguration

spring-shell-autoconfigure/src/test/java/org/springframework/shell/boot/TerminalUIAutoConfigurationTests.java

@@ -0,0 +1,108 @@
+/*
+ * Copyright 2023 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.boot;
+
+import java.util.Set;
+
+import org.jline.terminal.Size;
+import org.jline.terminal.Terminal;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.shell.component.view.TerminalUI;
+import org.springframework.shell.component.view.TerminalUIBuilder;
+import org.springframework.shell.component.view.TerminalUICustomizer;
+import org.springframework.shell.style.ThemeActive;
+import org.springframework.shell.style.ThemeRegistry;
+import org.springframework.shell.style.ThemeResolver;
+import org.springframework.test.util.ReflectionTestUtils;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+class TerminalUIAutoConfigurationTests {
+
+	private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
+			.withConfiguration(AutoConfigurations.of(TerminalUIAutoConfiguration.class));
+
+	@Test
+	public void terminalUICreated() {
+		this.contextRunner
+				.withUserConfiguration(MockConfiguration.class)
+				.run(context -> {
+					assertThat(context).hasSingleBean(TerminalUIBuilder.class);
+				});
+	}
+
+	@Test
+	@SuppressWarnings("unchecked")
+	public void canCustomize() {
+		this.contextRunner
+				.withUserConfiguration(TestConfiguration.class, MockConfiguration.class)
+				.run(context -> {
+					TerminalUIBuilder builder = context.getBean(TerminalUIBuilder.class);
+					Set<TerminalUICustomizer> customizers = (Set<TerminalUICustomizer>) ReflectionTestUtils
+							.getField(builder, "customizers");
+					assertThat(customizers).hasSize(1);
+				});
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	static class MockConfiguration {
+
+		@Bean
+		Terminal mockTerminal() {
+			Terminal terminal = mock(Terminal.class);
+			when(terminal.getBufferSize()).thenReturn(new Size());
+			return terminal;
+		}
+
+		@Bean
+		ThemeResolver mockThemeResolver() {
+			return new ThemeResolver(new ThemeRegistry(), "default");
+		}
+
+		@Bean
+		ThemeActive themeActive() {
+			return () -> {
+				return "default";
+			};
+		}
+
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	static class TestConfiguration {
+
+		@Bean
+		TerminalUICustomizer terminalUICustomizer() {
+			return new TestTerminalUICustomizer();
+		}
+	}
+
+	static class TestTerminalUICustomizer implements TerminalUICustomizer {
+
+		@Override
+		public void customize(TerminalUI terminalUI) {
+			terminalUI.setThemeName("test");
+		}
+	}
+
+}