Add simple ANSI encoder and colorize the banner

Issue: #51754753

spring-bootstrap/src/main/java/org/springframework/bootstrap/Banner.java

@@ -18,6 +18,12 @@ package org.springframework.bootstrap;
 
 import java.io.PrintStream;
 
+import org.springframework.bootstrap.ansi.AnsiOutput;
+
+import static org.springframework.bootstrap.ansi.AnsiElement.DEFAULT;
+import static org.springframework.bootstrap.ansi.AnsiElement.FAINT;
+import static org.springframework.bootstrap.ansi.AnsiElement.GREEN;
+
 /**
  * Writes the 'Spring' banner.
  * 
@@ -25,7 +31,8 @@ import java.io.PrintStream;
  */
 abstract class Banner {
 
-	private static final String[] BANNER = { "  .   ____          _            __ _ _",
+	private static final String[] BANNER = { "",
+			"  .   ____          _            __ _ _",
 			" /\\\\ / ___'_ __ _ _(_)_ __  __ _ \\ \\ \\ \\",
 			"( ( )\\___ | '_ | '_| | '_ \\/ _` | \\ \\ \\ \\",
 			" \\\\/  ___)| |_)| | | | | || (_| |  ) ) ) )",
@@ -37,14 +44,12 @@ abstract class Banner {
 	 * @param printStream the output print stream
 	 */
 	public static void write(PrintStream printStream) {
-		printStream.println();
 		for (String line : BANNER) {
 			printStream.println(line);
 		}
 		String version = Banner.class.getPackage().getImplementationVersion();
-		printStream.println("  Spring Bootstrap"
+		printStream.println(AnsiOutput.toString(GREEN, " Spring Bootstrap", DEFAULT,
-				+ (version == null ? "" : " (v" + version + ")"));
+				FAINT, (version == null ? "" : " (v" + version + ")")));
 		printStream.println();
 	}
-
 }

spring-bootstrap/src/main/java/org/springframework/bootstrap/ansi/AnsiElement.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright 2012-2013 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
+ *
+ *      http://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.bootstrap.ansi;
+
+/**
+ * An ANSI encodable element.
+ * 
+ * @author Phillip Webb
+ */
+public interface AnsiElement {
+
+	public static final AnsiElement NORMAL = new DefaultAnsiElement("0");
+	public static final AnsiElement BOLD = new DefaultAnsiElement("1");
+	public static final AnsiElement FAINT = new DefaultAnsiElement("2");
+	public static final AnsiElement ITALIC = new DefaultAnsiElement("3");
+	public static final AnsiElement UNDERLINE = new DefaultAnsiElement("4");
+
+	public static final AnsiElement BLACK = new DefaultAnsiElement("30");
+	public static final AnsiElement RED = new DefaultAnsiElement("31");
+	public static final AnsiElement GREEN = new DefaultAnsiElement("32");
+	public static final AnsiElement YELLOW = new DefaultAnsiElement("33");
+	public static final AnsiElement BLUE = new DefaultAnsiElement("34");
+	public static final AnsiElement MAGENTA = new DefaultAnsiElement("35");
+	public static final AnsiElement CYAN_FG = new DefaultAnsiElement("36");
+	public static final AnsiElement WHITE = new DefaultAnsiElement("37");
+	public static final AnsiElement DEFAULT = new DefaultAnsiElement("39");
+
+	/**
+	 * @return the ANSI escape code
+	 */
+	@Override
+	public String toString();
+
+	/**
+	 * Internal default {@link AnsiElement} implementation.
+	 */
+	static class DefaultAnsiElement implements AnsiElement {
+
+		private final String code;
+
+		public DefaultAnsiElement(String code) {
+			this.code = code;
+		}
+
+		@Override
+		public String toString() {
+			return this.code;
+		}
+	}
+
+}

spring-bootstrap/src/main/java/org/springframework/bootstrap/ansi/AnsiOutput.java

@@ -0,0 +1,123 @@
+/*
+ * Copyright 2012-2013 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
+ *
+ *      http://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.bootstrap.ansi;
+
+import org.springframework.util.Assert;
+
+/**
+ * Generates ANSI encoded output, automatically attempting to detect if the terminal
+ * supports ANSI.
+ * 
+ * @author Phillip Webb
+ */
+public abstract class AnsiOutput {
+
+	private static final String ENCODE_JOIN = ";";
+
+	private static Enabled enabled = Enabled.DETECT;
+
+	private static final String OPERATING_SYSTEM_NAME = System.getProperty("os.name")
+			.toLowerCase();
+
+	private static final Object ENCODE_START = "\033[";
+
+	private static final Object ENCODE_END = "m";
+
+	final private static String RESET = "0;" + AnsiElement.DEFAULT;
+
+	/**
+	 * Sets if ANSI output is enabled.
+	 * @param enabled if ANSI is enabled, disabled or detected
+	 */
+	public static void setEnabled(Enabled enabled) {
+		Assert.notNull(enabled, "Enabled must not be null");
+		AnsiOutput.enabled = enabled;
+	}
+
+	/**
+	 * Create a new ANSI string from the specified elements. Any {@link AnsiElement}s will
+	 * be encoded as required.
+	 * @param elements the elements to encode
+	 * @return a string of the encoded elements
+	 */
+	public static String toString(Object... elements) {
+		StringBuilder sb = new StringBuilder();
+		if (isEnabled()) {
+			buildEnabled(sb, elements);
+		}
+		else {
+			buildDisabled(sb, elements);
+		}
+		return sb.toString();
+	}
+
+	private static void buildEnabled(StringBuilder sb, Object[] elements) {
+		boolean writingAnsi = false;
+		boolean containsEncoding = false;
+		for (Object element : elements) {
+			if (element instanceof AnsiElement) {
+				containsEncoding = true;
+				if (!writingAnsi) {
+					sb.append(ENCODE_START);
+					writingAnsi = true;
+				}
+				else {
+					sb.append(ENCODE_JOIN);
+				}
+			}
+			else {
+				if (writingAnsi) {
+					sb.append(ENCODE_END);
+					writingAnsi = false;
+				}
+			}
+			sb.append(element);
+		}
+		if (containsEncoding) {
+			sb.append(writingAnsi ? ENCODE_JOIN : ENCODE_START);
+			sb.append(RESET);
+			sb.append(ENCODE_END);
+		}
+	}
+
+	private static void buildDisabled(StringBuilder sb, Object[] elements) {
+		for (Object element : elements) {
+			if (!(element instanceof AnsiElement) && element != null) {
+				sb.append(element);
+			}
+		}
+	}
+
+	private static boolean isEnabled() {
+		if (enabled == Enabled.DETECT) {
+			return detectIfEnabled();
+		}
+		return enabled == Enabled.ALWAYS;
+	}
+
+	private static boolean detectIfEnabled() {
+		if (System.console() == null) {
+			return false;
+		}
+		return !(OPERATING_SYSTEM_NAME.indexOf("win") >= 0);
+	}
+
+	public static enum Enabled {
+		DETECT, ALWAYS, NEVER
+	};
+
+}

spring-bootstrap/src/test/java/org/springframework/bootstrap/ansi/AnsiOutputTest.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2012-2013 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
+ *
+ *      http://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.bootstrap.ansi;
+
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.springframework.bootstrap.ansi.AnsiOutput.Enabled;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.junit.Assert.assertThat;
+import static org.springframework.bootstrap.ansi.AnsiElement.BOLD;
+import static org.springframework.bootstrap.ansi.AnsiElement.FAINT;
+import static org.springframework.bootstrap.ansi.AnsiElement.GREEN;
+import static org.springframework.bootstrap.ansi.AnsiElement.NORMAL;
+import static org.springframework.bootstrap.ansi.AnsiElement.RED;
+
+/**
+ * Tests for {@link AnsiOutput}.
+ * 
+ * @author Phillip Webb
+ */
+public class AnsiOutputTest {
+
+	@BeforeClass
+	public static void enable() {
+		AnsiOutput.setEnabled(Enabled.ALWAYS);
+	}
+
+	@AfterClass
+	public static void reset() {
+		AnsiOutput.setEnabled(Enabled.DETECT);
+	}
+
+	@Test
+	public void encoding() throws Exception {
+		String encoded = AnsiOutput.toString("A", RED, BOLD, "B", NORMAL, "D", GREEN,
+				"E", FAINT, "F");
+		assertThat(encoded, equalTo("ABDEF"));
+	}
+
+}

spring-starters/spring-starter/pom.xml

@@ -36,11 +36,6 @@
 			<groupId>org.slf4j</groupId>
 			<artifactId>jcl-over-slf4j</artifactId>
 		</dependency>
-		<dependency>
-			<groupId>org.slf4j</groupId>
-			<artifactId>slf4j-jdk14</artifactId>
-			<scope>runtime</scope>
-		</dependency>
 		<dependency>
 			<groupId>org.springframework</groupId>
 			<artifactId>spring-beans</artifactId>