feat: pluggable widget engine v2

PLUGGABLEWIDGET syntax with explicit properties, auto datasource,
auto child slots, TextTemplate attribute binding, and keyword properties.

Core changes:
- PLUGGABLEWIDGET 'widget.id' name (key: value) syntax
- CUSTOMWIDGET/TABCONTAINER/TABPAGE grammar tokens
- Auto datasource ordering (step 4.1, before child slots)
- Auto child slot matching by container name
- Object list auto-populate with Required filter
- TextTemplate {AttrName} parameter binding
- Widget lifecycle CLI (widget init/docs)
- DESCRIBE PLUGGABLEWIDGET output for generic widgets
- 20 new widget templates (mendix-11.6)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: engalar

cmd/mxcli/cmd_widget.go

@@ -44,14 +44,39 @@ var widgetListCmd = &cobra.Command{
 	RunE:  runWidgetList,
 }
 
+var widgetInitCmd = &cobra.Command{
+	Use:   "init",
+	Short: "Extract definitions for all project widgets",
+	Long: `Scan the project's widgets/ directory, extract .def.json for each .mpk,
+and generate skill documentation in .claude/skills/widgets/.
+
+This enables CREATE PAGE to use any project widget via the pluggable engine.`,
+	RunE: runWidgetInit,
+}
+
+var widgetDocsCmd = &cobra.Command{
+	Use:   "docs",
+	Short: "Generate widget skill documentation",
+	Long:  `Generate per-widget markdown documentation in .claude/skills/widgets/ from .mpk definitions.`,
+	RunE:  runWidgetDocs,
+}
+
 func init() {
 	widgetExtractCmd.Flags().String("mpk", "", "Path to .mpk widget package file")
 	widgetExtractCmd.Flags().StringP("output", "o", "", "Output directory (default: .mxcli/widgets/)")
 	widgetExtractCmd.Flags().String("mdl-name", "", "Override the MDL keyword name (default: derived from widget name)")
 	widgetExtractCmd.MarkFlagRequired("mpk")
 
+	widgetInitCmd.Flags().StringP("project", "p", "", "Path to .mpr project file")
+	widgetInitCmd.MarkFlagRequired("project")
+
+	widgetDocsCmd.Flags().StringP("project", "p", "", "Path to .mpr project file")
+	widgetDocsCmd.MarkFlagRequired("project")
+
 	widgetCmd.AddCommand(widgetExtractCmd)
 	widgetCmd.AddCommand(widgetListCmd)
+	widgetCmd.AddCommand(widgetInitCmd)
+	widgetCmd.AddCommand(widgetDocsCmd)
 	rootCmd.AddCommand(widgetCmd)
 }
 
@@ -115,76 +140,219 @@ func deriveMDLName(widgetID string) string {
 	return strings.ToUpper(name)
 }
 
-// generateDefJSON creates a WidgetDefinition from an mpk.WidgetDefinition.
+// generateDefJSON creates a skeleton WidgetDefinition from an mpk.WidgetDefinition.
+// Properties are handled explicitly from MDL via the engine's explicit property pass,
+// so no propertyMappings or childSlots are generated here.
 func generateDefJSON(mpkDef *mpk.WidgetDefinition, mdlName string) *executor.WidgetDefinition {
-	def := &executor.WidgetDefinition{
+	widgetKind := "custom"
+	if mpkDef.IsPluggable {
+		widgetKind = "pluggable"
+	}
+	return &executor.WidgetDefinition{
 		WidgetID:        mpkDef.ID,
 		MDLName:         mdlName,
+		WidgetKind:      widgetKind,
 		TemplateFile:    strings.ToLower(mdlName) + ".json",
 		DefaultEditable: "Always",
 	}
+}
+
+func runWidgetInit(cmd *cobra.Command, args []string) error {
+	projectPath, _ := cmd.Flags().GetString("project")
+	projectDir := filepath.Dir(projectPath)
+	widgetsDir := filepath.Join(projectDir, "widgets")
+	outputDir := filepath.Join(projectDir, ".mxcli", "widgets")
+
+	// Load built-in registry to skip widgets that already have hand-crafted definitions
+	builtinRegistry, _ := executor.NewWidgetRegistry()
+
+	// Scan widgets/ for .mpk files
+	matches, err := filepath.Glob(filepath.Join(widgetsDir, "*.mpk"))
+	if err != nil {
+		return fmt.Errorf("failed to scan widgets directory: %w", err)
+	}
+	if len(matches) == 0 {
+		fmt.Println("No .mpk files found in widgets/ directory.")
+		return nil
+	}
+
+	if err := os.MkdirAll(outputDir, 0755); err != nil {
+		return fmt.Errorf("failed to create output directory: %w", err)
+	}
+
+	var extracted, skipped int
+	for _, mpkPath := range matches {
+		mpkDef, err := mpk.ParseMPK(mpkPath)
+		if err != nil {
+			log.Printf("warning: skipping %s: %v", filepath.Base(mpkPath), err)
+			skipped++
+			continue
+		}
+
+		mdlName := deriveMDLName(mpkDef.ID)
+		filename := strings.ToLower(mdlName) + ".def.json"
+		outPath := filepath.Join(outputDir, filename)
 
-	// Build property mappings by inferring operations from XML types
-	var mappings []executor.PropertyMapping
-	var childSlots []executor.ChildSlotMapping
-
-	for _, prop := range mpkDef.Properties {
-		normalizedType := mpk.NormalizeType(prop.Type)
-
-		switch normalizedType {
-		case "attribute":
-			mappings = append(mappings, executor.PropertyMapping{
-				PropertyKey: prop.Key,
-				Source:      "Attribute",
-				Operation:   "attribute",
-			})
-		case "association":
-			mappings = append(mappings, executor.PropertyMapping{
-				PropertyKey: prop.Key,
-				Source:      "Association",
-				Operation:   "association",
-			})
-		case "datasource":
-			mappings = append(mappings, executor.PropertyMapping{
-				PropertyKey: prop.Key,
-				Source:      "DataSource",
-				Operation:   "datasource",
-			})
-		case "widgets":
-			// Widgets properties become child slots
-			containerName := strings.ToUpper(prop.Key)
-			if containerName == "CONTENT" {
-				containerName = "TEMPLATE"
+		// Skip widgets that have hand-crafted built-in definitions (e.g., COMBOBOX, GALLERY)
+		if builtinRegistry != nil {
+			if _, ok := builtinRegistry.GetByWidgetID(mpkDef.ID); ok {
+				skipped++
+				continue
 			}
-			childSlots = append(childSlots, executor.ChildSlotMapping{
-				PropertyKey:  prop.Key,
-				MDLContainer: containerName,
-				Operation:    "widgets",
-			})
-		case "selection":
-			mappings = append(mappings, executor.PropertyMapping{
-				PropertyKey: prop.Key,
-				Source:      "Selection",
-				Operation:   "selection",
-				Default:     prop.DefaultValue,
-			})
-		case "boolean", "string", "enumeration", "integer", "decimal":
-			mapping := executor.PropertyMapping{
-				PropertyKey: prop.Key,
-				Operation:   "primitive",
+		}
+
+		// Skip if already exists on disk
+		if _, err := os.Stat(outPath); err == nil {
+			skipped++
+			continue
+		}
+
+		defJSON := generateDefJSON(mpkDef, mdlName)
+		data, err := json.MarshalIndent(defJSON, "", "  ")
+		if err != nil {
+			log.Printf("warning: skipping %s: %v", mpkDef.ID, err)
+			skipped++
+			continue
+		}
+		data = append(data, '\n')
+
+		if err := os.WriteFile(outPath, data, 0644); err != nil {
+			return fmt.Errorf("failed to write %s: %w", outPath, err)
+		}
+		kind := "custom"
+		if mpkDef.IsPluggable {
+			kind = "pluggable"
+		}
+		fmt.Printf("  %-12s %-20s %s\n", kind, mdlName, mpkDef.ID)
+		extracted++
+	}
+
+	fmt.Printf("\nExtracted: %d, Skipped: %d (existing or unparseable)\n", extracted, skipped)
+
+	// Also generate docs
+	fmt.Println("\nGenerating widget documentation...")
+	return generateWidgetDocs(projectDir)
+}
+
+func runWidgetDocs(cmd *cobra.Command, args []string) error {
+	projectPath, _ := cmd.Flags().GetString("project")
+	projectDir := filepath.Dir(projectPath)
+	return generateWidgetDocs(projectDir)
+}
+
+func generateWidgetDocs(projectDir string) error {
+	widgetsDir := filepath.Join(projectDir, "widgets")
+	docsDir := filepath.Join(projectDir, ".claude", "skills", "widgets")
+	// Also try .ai-context
+	if _, err := os.Stat(filepath.Join(projectDir, ".ai-context")); err == nil {
+		docsDir = filepath.Join(projectDir, ".ai-context", "skills", "widgets")
+	}
+
+	if err := os.MkdirAll(docsDir, 0755); err != nil {
+		return fmt.Errorf("failed to create docs directory: %w", err)
+	}
+
+	matches, err := filepath.Glob(filepath.Join(widgetsDir, "*.mpk"))
+	if err != nil {
+		return fmt.Errorf("failed to scan widgets directory: %w", err)
+	}
+
+	var generated int
+	var indexEntries []string
+
+	for _, mpkPath := range matches {
+		mpkDef, err := mpk.ParseMPK(mpkPath)
+		if err != nil {
+			continue
+		}
+
+		mdlName := deriveMDLName(mpkDef.ID)
+		filename := strings.ToLower(mdlName) + ".md"
+		outPath := filepath.Join(docsDir, filename)
+
+		doc := generateWidgetDoc(mpkDef, mdlName)
+
+		if err := os.WriteFile(outPath, []byte(doc), 0644); err != nil {
+			log.Printf("warning: failed to write %s: %v", filename, err)
+			continue
+		}
+
+		kind := "CUSTOMWIDGET"
+		if mpkDef.IsPluggable {
+			kind = "PLUGGABLEWIDGET"
+		}
+		indexEntries = append(indexEntries, fmt.Sprintf("| `%s` | %s | `%s` | %s | %d |",
+			kind, mdlName, mpkDef.ID, mpkDef.Name, len(mpkDef.Properties)))
+		generated++
+	}
+
+	// Write index
+	var indexBuf strings.Builder
+	indexBuf.WriteString("# Available Widgets\n\n")
+	indexBuf.WriteString("Generated by `mxcli widget docs`. See individual files for property details.\n\n")
+	indexBuf.WriteString("| Prefix | Name | Widget ID | Display Name | Props |\n")
+	indexBuf.WriteString("|--------|------|-----------|--------------|-------|\n")
+	for _, entry := range indexEntries {
+		indexBuf.WriteString(entry)
+		indexBuf.WriteString("\n")
+	}
+	indexBuf.WriteString("\n**Usage in MDL:**\n```sql\n")
+	indexBuf.WriteString("-- React pluggable widgets\n")
+	indexBuf.WriteString("PLUGGABLEWIDGET 'com.mendix.widget.custom.badge.Badge' badge1\n\n")
+	indexBuf.WriteString("-- Legacy custom widgets\n")
+	indexBuf.WriteString("CUSTOMWIDGET 'com.company.OldWidget' legacy1\n")
+	indexBuf.WriteString("```\n")
+
+	indexPath := filepath.Join(docsDir, "_index.md")
+	if err := os.WriteFile(indexPath, []byte(indexBuf.String()), 0644); err != nil {
+		return fmt.Errorf("failed to write index: %w", err)
+	}
+
+	fmt.Printf("Generated %d widget docs in %s\n", generated, docsDir)
+	return nil
+}
+
+func generateWidgetDoc(mpkDef *mpk.WidgetDefinition, mdlName string) string {
+	var buf strings.Builder
+
+	prefix := "CUSTOMWIDGET"
+	if mpkDef.IsPluggable {
+		prefix = "PLUGGABLEWIDGET"
+	}
+
+	buf.WriteString(fmt.Sprintf("# %s\n\n", mpkDef.Name))
+	buf.WriteString(fmt.Sprintf("- **Widget ID:** `%s`\n", mpkDef.ID))
+	buf.WriteString(fmt.Sprintf("- **Type:** %s\n", prefix))
+	buf.WriteString(fmt.Sprintf("- **Version:** %s\n\n", mpkDef.Version))
+
+	buf.WriteString("## MDL Example\n\n```sql\n")
+	buf.WriteString(fmt.Sprintf("%s '%s' widget1\n", prefix, mpkDef.ID))
+	buf.WriteString("```\n\n")
+
+	if len(mpkDef.Properties) > 0 {
+		buf.WriteString("## Properties\n\n")
+		buf.WriteString("| Property | Type | Required | Default | Description |\n")
+		buf.WriteString("|----------|------|----------|---------|-------------|\n")
+
+		for _, prop := range mpkDef.Properties {
+			if prop.IsSystem {
+				continue
+			}
+			req := ""
+			if prop.Required {
+				req = "Yes"
 			}
-			if prop.DefaultValue != "" {
-				mapping.Value = prop.DefaultValue
+			desc := prop.Description
+			if len(desc) > 80 {
+				desc = desc[:77] + "..."
 			}
-			mappings = append(mappings, mapping)
-		// Skip action, expression, textTemplate, object, icon, image, file — too complex for auto-mapping
+			buf.WriteString(fmt.Sprintf("| `%s` | %s | %s | %s | %s |\n",
+				prop.Key, prop.Type, req, prop.DefaultValue, desc))
 		}
 	}
 
-	def.PropertyMappings = mappings
-	def.ChildSlots = childSlots
-
-	return def
+	buf.WriteString("\n")
+	return buf.String()
 }
 
 func runWidgetList(cmd *cobra.Command, args []string) error {
@@ -207,10 +375,14 @@ func runWidgetList(cmd *cobra.Command, args []string) error {
 		return nil
 	}
 
-	fmt.Printf("%-20s %-50s %s\n", "MDL Name", "Widget ID", "Template")
-	fmt.Printf("%-20s %-50s %s\n", strings.Repeat("-", 20), strings.Repeat("-", 50), strings.Repeat("-", 20))
+	fmt.Printf("%-16s %-20s %-50s %s\n", "Kind", "MDL Name", "Widget ID", "Template")
+	fmt.Printf("%-16s %-20s %-50s %s\n", strings.Repeat("-", 16), strings.Repeat("-", 20), strings.Repeat("-", 50), strings.Repeat("-", 20))
 	for _, def := range defs {
-		fmt.Printf("%-20s %-50s %s\n", def.MDLName, def.WidgetID, def.TemplateFile)
+		kind := def.WidgetKind
+		if kind == "" {
+			kind = "pluggable"
+		}
+		fmt.Printf("%-16s %-20s %-50s %s\n", kind, def.MDLName, def.WidgetID, def.TemplateFile)
 	}
 	fmt.Printf("\nTotal: %d definitions\n", len(defs))