fix: clear screen moves scroll up (instead of adding new lines)

Fixes #68
dialex · May 8, 2022 · 0187cd8 · 0187cd8
1 parent 46d8724
commit 0187cd8
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Showing 3 changed files with 22 additions and 2 deletions.
diff --git a/src/main/java/com/diogonunes/jcolor/Command.java b/src/main/java/com/diogonunes/jcolor/Command.java
@@ -20,7 +20,8 @@ public class Command {
      * @return Clears the terminal's text, e.g. just like the command-line `clear`.
      */
     public static Command CLEAR_SCREEN() {
-        return new Command("2J");
+        // Covers https://github.com/dialex/JColor/issues/68
+        return new Command("H\\033[2J\"");
     }
 
     @Override

diff --git a/src/test/java/com/diogonunes/jcolor/tests/unit/TestAnsi.java b/src/test/java/com/diogonunes/jcolor/tests/unit/TestAnsi.java
@@ -6,6 +6,9 @@
 import com.diogonunes.jcolor.Command;
 import org.junit.jupiter.api.Test;
 
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
 import static com.diogonunes.jcolor.Ansi.*;
 import static com.diogonunes.jcolor.Attribute.*;
 import static com.diogonunes.jcolor.tests.unit.DataGenerator.*;
@@ -58,6 +61,22 @@ public void GenerateCode_OneCommand() {
         assertThat(code, equalTo(expectedCode));
     }
 
+    @Test // Covers https://github.com/dialex/JColor/issues/68
+    public void GenerateCode_ComplexCommand() {
+        // ARRANGE
+        int totalCommands = 0;
+        Command command = Command.CLEAR_SCREEN();
+
+        // ACT
+        String code = generateCode(command);
+
+        // ASSERT
+        Matcher prefix = (Pattern.compile("\\[")).matcher(code);
+        while (prefix.find())
+            totalCommands++;
+        assertThat(totalCommands, equalTo(2));
+    }
+
     @Test // Covers https://github.com/dialex/JColor/issues/6
     public void GenerateCode_OneAttribute_Simple() {
         // ARRANGE

diff --git a/src/test/java/com/diogonunes/jcolor/tests/unit/TestCommand.java b/src/test/java/com/diogonunes/jcolor/tests/unit/TestCommand.java
@@ -20,7 +20,7 @@ public void Attribute_AnsiCode_ClearScreen() {
         String code = command.toString();
 
         // ASSERT
-        String expectedAnsiCode = "2J";
+        String expectedAnsiCode = "H\\033[2J\"";
         assertThat(code, equalTo(expectedAnsiCode));
     }