Screen writer support for AttributedString

- New Screen.Writer has new text method taking
  AttributedString instead of just String
- Fixes #1110

Author: jvalkeal

spring-shell-core/src/main/java/org/springframework/shell/component/view/screen/DefaultScreen.java

@@ -30,6 +30,8 @@
 import org.springframework.shell.geom.Position;
 import org.springframework.shell.geom.Rectangle;
 import org.springframework.shell.geom.VerticalAlign;
+import org.springframework.shell.style.ThemeResolver;
+import org.springframework.shell.style.ThemeResolver.ResolvedValues;
 import org.springframework.util.Assert;
 
 /**
@@ -312,6 +314,29 @@ public void text(String text, int x, int y) {
 			}
 		}
 
+		@Override
+		public void text(AttributedString text, int x, int y) {
+			Layer layer = getLayer(index);
+			for (int i = 0; i < text.length() && i < columns; i++) {
+				DefaultScreenItem item = layer.getScreenItem(x + i, y);
+				if (item != null) {
+					char c = text.charAt(i);
+					AttributedStyle as = text.styleAt(i);
+					ResolvedValues rv = ThemeResolver.resolveValues(as);
+					item.content = Character.toString(c);
+					if (rv.foreground() > -1) {
+						item.foreground = rv.foreground();
+					}
+					if (rv.style() > -1) {
+						item.style = rv.style();
+					}
+					if (rv.background() > -1) {
+						item.background = rv.background();
+					}
+				}
+			}
+		}
+
 		@Override
 		public void border(int x, int y, int width, int height) {
 			log.trace("PrintBorder rows={}, columns={}, x={}, y={}, width={}, height={}", rows, columns, x, y, width,

spring-shell-core/src/main/java/org/springframework/shell/component/view/screen/Screen.java

@@ -15,6 +15,8 @@
  */
 package org.springframework.shell.component.view.screen;
 
+import org.jline.utils.AttributedString;
+
 import org.springframework.lang.Nullable;
 import org.springframework.shell.geom.HorizontalAlign;
 import org.springframework.shell.geom.Position;
@@ -107,6 +109,16 @@ interface Writer {
 		 */
 		void text(String text, int x, int y);
 
+		/**
+		 * Write an attributed text horizontally starting from a position defined by
+		 * {@code x} and {@code y} within a bounds of a {@link Screen}.
+		 *
+		 * @param text the text to write
+		 * @param x the x position
+		 * @param y the y position
+		 */
+		void text(AttributedString text, int x, int y);
+
 		/**
 		 * Write a border with a given rectangle coordinates.
 		 *

spring-shell-core/src/main/java/org/springframework/shell/style/ThemeResolver.java

@@ -70,7 +70,7 @@ public record ResolvedValues(int style, int foreground, int background){}
 	 * @param attributedStyle the attibuted style
 	 * @return resolved values
 	 */
-	public ResolvedValues resolveValues(AttributedStyle attributedStyle) {
+	public static ResolvedValues resolveValues(AttributedStyle attributedStyle) {
 		long style = attributedStyle.getStyle();
 		long s = style & ~(F_FOREGROUND | F_BACKGROUND);
 		s = (s & 0x00007FFF);

spring-shell-core/src/test/java/org/springframework/shell/component/view/screen/ScreenTests.java

@@ -15,6 +15,7 @@
  */
 package org.springframework.shell.component.view.screen;
 
+import org.jline.utils.AttributedString;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.shell.component.view.control.AbstractViewTests;
@@ -56,6 +57,13 @@ void printsText() {
 		assertThat(forScreen(screen24x80)).hasHorizontalText("text", 0, 0, 4);
 	}
 
+	@Test
+	void printsAttributedText() {
+		AttributedString text = new AttributedString("text");
+		screen24x80.writerBuilder().build().text(text, 0, 0);
+		assertThat(forScreen(screen24x80)).hasHorizontalText("text", 0, 0, 4);
+	}
+
 	@Test
 	void printsTextWithForegroundColor() {
 		Writer writer = screen24x80.writerBuilder().color(Color.RED).build();