[MNG-6915] Add a helper method to get the terminal width

gnodet · gnodet · commit f94bb250dcdd · 2021-04-16T20:14:49.000+02:00
diff --git a/src/main/java/org/apache/maven/shared/utils/logging/MessageUtils.java b/src/main/java/org/apache/maven/shared/utils/logging/MessageUtils.java
@@ -201,4 +201,22 @@ public void run()
             Runtime.getRuntime().addShutdownHook( shutdownHook );
         }
     }
+
+    /**
+     * Get the terminal width or -1 if the width cannot be determined.
+     *
+     * @return the terminal width
+     */
+    public static int getTerminalWidth()
+    {
+        if ( JANSI )
+        {
+            int width = AnsiConsole.getTerminalWidth();
+            return width > 0 ? width : -1;
+        }
+        else
+        {
+            return -1;
+        }
+    }
 }
diff --git a/src/test/java/org/apache/maven/shared/utils/logging/MessageUtilsTest.java b/src/test/java/org/apache/maven/shared/utils/logging/MessageUtilsTest.java
@@ -22,9 +22,18 @@
 import static org.hamcrest.CoreMatchers.not;
 import static org.hamcrest.CoreMatchers.sameInstance;
 import static org.hamcrest.MatcherAssert.assertThat;
+import static org.junit.Assert.assertEquals;
 
+import java.io.ByteArrayOutputStream;
 import java.io.PrintStream;
+import java.nio.charset.StandardCharsets;
 
+import org.fusesource.jansi.AnsiColors;
+import org.fusesource.jansi.AnsiConsole;
+import org.fusesource.jansi.AnsiMode;
+import org.fusesource.jansi.AnsiPrintStream;
+import org.fusesource.jansi.AnsiType;
+import org.fusesource.jansi.io.AnsiOutputStream;
 import org.junit.Test;
 
 public class MessageUtilsTest
@@ -45,4 +54,24 @@ public void testSystem()
             System.setOut( currentOut );
         }
     }
+
+    @Test
+    public void testTerminalWidth()
+    {
+        AnsiOutputStream.WidthSupplier width = new AnsiOutputStream.WidthSupplier()
+        {
+            @Override
+            public int getTerminalWidth()
+            {
+                return 33;
+            }
+        };
+        AnsiOutputStream aos = new AnsiOutputStream( new ByteArrayOutputStream(), width, AnsiMode.Default,
+                null, AnsiType.Emulation, AnsiColors.Colors256, StandardCharsets.UTF_8,
+                null, null, false );
+        AnsiConsole.systemInstall();
+        AnsiConsole.out = new AnsiPrintStream( aos, true );
+        assertEquals( 33, MessageUtils.getTerminalWidth() );
+        AnsiConsole.systemUninstall();
+    }
 }
