Merge pull request #1612 from ikedam/feature/JENKINS-27505_TextareaStartsEmptyLine

[JENKINS-27505] Preserve an empty line at the beginning of a textarea

core/src/main/resources/lib/form/textarea.jelly

@@ -89,6 +89,7 @@ THE SOFTWARE.
             readonly="${attrs.readonly}"
             codemirror-mode="${attrs['codemirror-mode']}"
             codemirror-config="${attrs['codemirror-config']}">
+    <j:if test="${value != null &amp;&amp; !empty(value.toString()) &amp;&amp; (value.toString().codePointAt(0) == 10 || value.toString().codePointAt(0) == 13)}"><j:whitespace>&#10;</j:whitespace></j:if>
     <st:out value="${value}" />
   </textarea>
   <j:if test="${customizedFields != null and attrs.field != null and value != default}">

test/src/test/groovy/lib/form/TextAreaTest.groovy

@@ -14,6 +14,8 @@ import org.kohsuke.stapler.QueryParameter
 
 import javax.inject.Inject
 
+import static org.junit.Assert.*
+
 /**
  *
  *
@@ -65,4 +67,62 @@ class TextAreaTest {
         }
 
     }
+    
+    @Issue("JENKINS-27505")
+    @Test
+    public void testText() {
+        T1:{
+            def TEXT_TO_TEST = "some\nvalue\n";
+            def p = j.createFreeStyleProject();
+            def target = new TextareaTestBuilder(TEXT_TO_TEST);
+            p.buildersList.add(target);
+            j.configRoundtrip(p);
+            j.assertEqualDataBoundBeans(target, p.getBuildersList().get(TextareaTestBuilder.class));
+        }
+        
+        // test for a textarea beginning with a empty line.
+        T2:{
+            def TEXT_TO_TEST = "\nbegin\n\nwith\nempty\nline\n\n";
+            def p = j.createFreeStyleProject();
+            def target = new TextareaTestBuilder(TEXT_TO_TEST);
+            p.buildersList.add(target);
+            j.configRoundtrip(p);
+            j.assertEqualDataBoundBeans(target, p.getBuildersList().get(TextareaTestBuilder.class));
+        }
+        
+        // test for a textarea beginning with two empty lines.
+        T3:{
+            def TEXT_TO_TEST = "\n\nbegin\n\nwith\ntwo\nempty\nline\n\n";
+            def p = j.createFreeStyleProject();
+            def target = new TextareaTestBuilder(TEXT_TO_TEST);
+            p.buildersList.add(target);
+            j.configRoundtrip(p);
+            j.assertEqualDataBoundBeans(target, p.getBuildersList().get(TextareaTestBuilder.class));
+        }
+    }
+
+    public static class TextareaTestBuilder extends Builder {
+        private text;
+        
+        @DataBoundConstructor
+        TextareaTestBuilder(String text) {
+            this.text = text;
+        }
+
+        public String getText() { return text; }
+
+        @TestExtension
+        public static class DescriptorImpl extends BuildStepDescriptor<Builder> {
+            @Override
+            boolean isApplicable(Class<? extends AbstractProject> jobType) {
+                return true;
+            }
+
+            @Override
+            String getDisplayName() {
+                return this.class.name;
+            }
+        }
+
+    }
 }

test/src/test/resources/lib/form/TextAreaTest/TextareaTestBuilder/config.jelly

+<!-- no config -->
+<?jelly escape-by-default='true'?>
+<j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:d="jelly:define" xmlns:l="/lib/layout" xmlns:t="/lib/hudson" xmlns:f="/lib/form">
+  <f:entry field="text" title="${%Text}">
+    <f:textarea/>
+  </f:entry>
+</j:jelly>