feat: support markdown tables (closes #1186)

src/main/java/ee/carlrobert/codegpt/toolwindow/chat/ResponseNodeRenderer.java

@@ -9,6 +9,10 @@ import com.vladsch.flexmark.ast.Heading;
 import com.vladsch.flexmark.ast.Link;
 import com.vladsch.flexmark.ast.OrderedListItem;
 import com.vladsch.flexmark.ast.Paragraph;
+import com.vladsch.flexmark.ext.tables.TableBlock;
+import com.vladsch.flexmark.ext.tables.TableCell;
+import com.vladsch.flexmark.ext.tables.TableHead;
+import com.vladsch.flexmark.ext.tables.TableRow;
 import com.vladsch.flexmark.html.HtmlWriter;
 import com.vladsch.flexmark.html.renderer.NodeRenderer;
 import com.vladsch.flexmark.html.renderer.NodeRendererContext;
@@ -28,10 +32,49 @@ public class ResponseNodeRenderer implements NodeRenderer {
         new NodeRenderingHandler<>(CodeBlock.class, this::renderCodeBlock),
         new NodeRenderingHandler<>(BulletListItem.class, this::renderBulletListItem),
         new NodeRenderingHandler<>(Heading.class, this::renderHeading),
-        new NodeRenderingHandler<>(OrderedListItem.class, this::renderOrderedListItem)
+        new NodeRenderingHandler<>(OrderedListItem.class, this::renderOrderedListItem),
+        new NodeRenderingHandler<>(TableBlock.class, this::renderTable),
+        new NodeRenderingHandler<>(TableRow.class, this::renderTableRow),
+        new NodeRenderingHandler<>(TableCell.class, this::renderTableCell)
     );
   }
 
+  private void renderTable(TableBlock node, NodeRendererContext context, HtmlWriter html) {
+    var borderColor = ColorUtil.toHex(new JBColor(0xD0D0D0, 0x3C3F47));
+    html.attr("style",
+        "border-collapse: collapse; width: 100%; margin: 8px 0; border-top: 1px solid "
+            + borderColor);
+    context.delegateRender();
+  }
+
+  private void renderTableRow(TableRow node, NodeRendererContext context, HtmlWriter html) {
+    html.attr("style",
+        "border-bottom: 1px solid " + ColorUtil.toHex(new JBColor(0xE3E3E3, 0x2D2F35)) + ";");
+    context.delegateRender();
+  }
+
+  private void renderTableCell(TableCell node, NodeRendererContext context, HtmlWriter html) {
+    TableRow row = (TableRow) node.getParent();
+    var isHeaderCell = row != null && row.getParent() instanceof TableHead;
+    var tag = isHeaderCell ? "th" : "td";
+
+    var styleBuilder = new StringBuilder();
+    styleBuilder.append("padding: 8px 12px; text-align: left; vertical-align: middle;");
+
+    if (isHeaderCell) {
+      var bgColor = ColorUtil.toHex(new JBColor(0xF2F3F5, 0x3A3D41));
+      styleBuilder.append(" font-weight: 600; background-color: ").append(bgColor).append("; color: white; min-width: 200px;");
+    }
+
+    html.attr("style", styleBuilder.toString().trim());
+    if (isHeaderCell) {
+      html.attr("scope", "col");
+    }
+    html.withAttr().tag(tag);
+    context.renderChildren(node);
+    html.tag("/" + tag);
+  }
+
   private void renderCodeBlock(CodeBlock node, NodeRendererContext context, HtmlWriter html) {
     html.attr("style", "white-space: pre-wrap;");
     context.delegateRender();

src/main/kotlin/ee/carlrobert/codegpt/util/MarkdownUtil.kt

@@ -1,5 +1,6 @@
 package ee.carlrobert.codegpt.util
 
+import com.vladsch.flexmark.ext.tables.TablesExtension
 import com.vladsch.flexmark.html.HtmlRenderer
 import com.vladsch.flexmark.parser.Parser
 import com.vladsch.flexmark.util.data.MutableDataSet
@@ -37,6 +38,7 @@ object MarkdownUtil {
     @JvmStatic
     fun convertMdToHtml(message: String): String {
         val options = MutableDataSet()
+        options.set(Parser.EXTENSIONS, listOf(TablesExtension.create()))
         options.set(HtmlRenderer.SOFT_BREAK, "<br/>")
 
         val document = Parser.builder(options).build().parse(message)

src/test/kotlin/ee/carlrobert/codegpt/util/MarkdownUtilTest.kt

@@ -5,6 +5,40 @@ import org.junit.Test
 
 class MarkdownUtilTest {
 
+  @Test
+  fun shouldRenderTableCorrectly() {
+    val markdown = """
+        <think>thinking content</think>
+        Here's a basic fruits table:
+        
+        | Fruit | Color | Price ($/kg) | Season | Calories (per 100g) |
+        |-------|-------|--------------|--------|---------------------|
+        | Apple | Red | 3.50 | Fall | 52 |
+        | Banana | Yellow | 2.80 | Year-round | 89 |
+        | Orange | Orange | 4.20 | Winter | 47 |
+        | Strawberry | Red | 6.00 | Spring | 32 |
+        | Grape | Purple | 5.50 | Summer | 69 |
+        | Mango | Orange | 7.00 | Summer | 60 |
+        | Watermelon | Green | 1.90 | Summer | 30 |
+        | Kiwi | Brown | 4.80 | Winter | 61 |
+        | Pineapple | Yellow | 5.00 | Year-round | 50 |
+        | Blueberry | Blue | 8.50 | Summer | 57 |
+    """.trimIndent()
+
+    val html = MarkdownUtil.convertMdToHtml(markdown)
+
+    assertThat(html).contains("thead")
+    assertThat(html).contains("/thead")
+    assertThat(html).contains("tbody")
+    assertThat(html).contains("/tbody")
+    assertThat(html).contains("th")
+    assertThat(html).contains("Fruit")
+    assertThat(html).contains("td")
+    assertThat(html).contains("Apple")
+    val tableCount = html.split("<table").size - 1
+    assertThat(tableCount).isEqualTo(1)
+  }
+
   @Test
   fun shouldExtractMarkdownCodeBlocks() {
     val testInput = """