Do not indent textarea contents

src/main/java/j2html/TagCreator.java

@@ -34,7 +34,7 @@ private TagCreator() {
     public static <T> T iff(boolean condition, T ifValue) {
         return condition ? ifValue : null;
     }
-    
+
     /**
      * Generic if-expression to if'ing inside method calls
      *
@@ -89,10 +89,10 @@ public static UnescapedText join(Object... stringOrDomObjects) {
      * @param <T>        The derived generic parameter type
      * @param collection the collection to iterate over, ex: a list of values "1, 2, 3"
      * @param mapper     the mapping function, ex: {@literal "n -> li(n.toString())"}
-     * @return rawHtml containing mapped data {@literal (ex. docs: <li>1</li><li>2</li><li>3</li>)}
+     * @return DomContent containing mapped data {@literal (ex. docs: [li(1), li(2), li(3)])}
      */
     public static <T> DomContent each(Collection<T> collection, Function<? super T, DomContent> mapper) {
-        return rawHtml(collection.stream().map(mapper.andThen(DomContent::render)).collect(Collectors.joining()));
+        return tag(null).with(collection.stream().map(mapper).collect(Collectors.toList()));
     }
 
     public static <I, T> DomContent each(final Map<I, T> map, final Function<Entry<I, T>, DomContent> mapper) {

src/main/java/j2html/tags/ContainerTag.java

@@ -137,24 +137,40 @@ public String renderFormatted() {
     private String renderFormatted(int lvl) throws IOException {
         StringBuilder sb = new StringBuilder();
         renderOpenTag(sb, null);
-        sb.append("\n");
+        if (hasTagName() && !isSelfFormattingTag()) {
+            sb.append("\n");
+        }
         if (!children.isEmpty()) {
             for (DomContent c : children) {
                 lvl++;
                 if (c instanceof ContainerTag) {
-                    sb.append(Config.indenter.indent(lvl, ((ContainerTag) c).renderFormatted(lvl)));
+                    if (((ContainerTag) c).hasTagName()) {
+                        sb.append(Config.indenter.indent(lvl, ((ContainerTag) c).renderFormatted(lvl)));
+                    } else {
+                        sb.append(Config.indenter.indent(lvl - 1, ((ContainerTag) c).renderFormatted(lvl - 1)));
+                    }
+                } else if (isSelfFormattingTag()) {
+                    sb.append(Config.indenter.indent(0, c.render()));
                 } else {
                     sb.append(Config.indenter.indent(lvl, c.render())).append("\n");
                 }
                 lvl--;
             }
         }
-        sb.append(Config.indenter.indent(lvl, ""));
+        if (!isSelfFormattingTag()) {
+            sb.append(Config.indenter.indent(lvl, ""));
+        }
         renderCloseTag(sb);
-        sb.append("\n");
+        if (hasTagName()) {
+            sb.append("\n");
+        }
         return sb.toString();
     }
 
+    private boolean isSelfFormattingTag() {
+        return "textarea".equals(tagName) || "pre".equals(tagName);
+    }
+
     @Override
     public void renderModel(Appendable writer, Object model) throws IOException {
         renderOpenTag(writer, model);

src/main/java/j2html/tags/Tag.java

@@ -19,6 +19,10 @@ public String getTagName() {
         return this.tagName;
     }
 
+    protected boolean hasTagName() {
+        return tagName != null && !tagName.isEmpty();
+    }
+
     String renderOpenTag() throws IOException {
         StringBuilder stringBuilder = new StringBuilder();
         renderOpenTag(stringBuilder, null);
@@ -32,6 +36,9 @@ String renderCloseTag() throws IOException {
     }
 
     void renderOpenTag(Appendable writer, Object model) throws IOException {
+        if (!hasTagName()) { // avoid <null> and <> tags
+            return;
+        }
         writer.append("<").append(tagName);
         for (Attribute attribute : attributes) {
             attribute.renderModel(writer, model);
@@ -40,6 +47,9 @@ void renderOpenTag(Appendable writer, Object model) throws IOException {
     }
 
     void renderCloseTag(Appendable writer) throws IOException {
+        if (!hasTagName()) { // avoid <null> and <> tags
+            return;
+        }
         writer.append("</");
         writer.append(tagName);
         writer.append(">");

src/test/java/j2html/tags/RenderFormattedTest.java

@@ -0,0 +1,61 @@
+package j2html.tags;
+
+import org.junit.Test;
+
+import java.util.Arrays;
+
+import static j2html.TagCreator.div;
+import static j2html.TagCreator.each;
+import static j2html.TagCreator.li;
+import static j2html.TagCreator.p;
+import static j2html.TagCreator.pre;
+import static j2html.TagCreator.textarea;
+import static j2html.TagCreator.ul;
+import static java.util.Arrays.asList;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+
+public class RenderFormattedTest {
+
+    @Test
+    public void testFormattedTags() throws Exception {
+        assertThat(div(p("Hello")).renderFormatted(), is("<div>\n    <p>\n        Hello\n    </p>\n</div>\n"));
+    }
+
+    @Test
+    public void testFormattedTags_doesntFormatPre() throws Exception {
+        assertThat(div(pre("public void renderModel(Appendable writer, Object model) throws IOException {\n" +
+            "        writer.append(text);\n" +
+            "    }")).renderFormatted(), is("<div>\n" +
+            "    <pre>public void renderModel(Appendable writer, Object model) throws IOException {\n" +
+            "        writer.append(text);\n" +
+            "    }</pre>\n" +
+            "</div>\n"));
+    }
+
+    @Test
+    public void testFormattedTags_doesntFormatTextArea() throws Exception {
+        assertThat(div(textarea("fred\ntom")).renderFormatted(), is("<div>\n" +
+            "    <textarea>fred\n" +
+            "tom</textarea>\n" +
+            "</div>\n"));
+    }
+
+    @Test
+    public void testFormattedTags_each() throws Exception {
+        assertThat(ul(each(asList(1, 2, 3), i -> li("Number " + i))).renderFormatted(), is(
+            "<ul>\n" +
+                "    <li>\n" +
+                "        Number 1\n" +
+                "    </li>\n" +
+                "    <li>\n" +
+                "        Number 2\n" +
+                "    </li>\n" +
+                "    <li>\n" +
+                "        Number 3\n" +
+                "    </li>\n" +
+                "</ul>\n"
+        ));
+    }
+
+}

src/test/java/j2html/tags/TagTest.java

@@ -11,8 +11,10 @@
 import static j2html.TagCreator.main;
 import static j2html.TagCreator.p;
 import static j2html.TagCreator.tag;
+import static j2html.TagCreator.textarea;
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.is;
+
 import j2html.Config;
 import j2html.model.DynamicHrefAttribute;
 import org.junit.Test;