Implement RitzMain() convention and Main.wasm standard

**Convention: RitzMain() entry point**
Every Ritz file now requires a `@component def RitzMain()` as the entry point.
This provides a consistent, predictable entry point for all applications.

**Universal Main.wasm output**
Build system now always outputs Main.wasm instead of ComponentName.wasm.
This means every example uses the exact same HTML boilerplate!

**Changes:**

**Codegen (llvm_codegen_signals.py):**
- Check for RitzMain component at generation time
- Error if RitzMain not found: "No RitzMain component found!"
- Always call `render_RitzMain()` from main() entry point
- Fix: Scope reactive text nodes to components (`@reactive_text_ComponentName_N_node`)
  - Prevents global name collisions when multiple components have reactive text

**Build (build.py):**
- Output Main.wasm in same directory as source file
- Output Main.ll (LLVM IR) for inspection
- Convention over configuration!

**Loader (ritz-runtime.js):**
- Auto-detect component name from WASM filename
- `new RitzLoader().load('Main.wasm')` - no second parameter needed!
- Component name used only for status messages

**Template (examples/template.html):**
- Minimal boilerplate - literally 25 lines
- Just copy and change nothing!
- Loads Main.wasm - works for every example

**Styles (examples/runtime/styles.css):**
- Shared styles for all examples
- Clean, modern defaults
- App container, buttons, inputs, typography

**Example (HighFive):**
```python
@component
def HighFive():
    # ... component logic

@component
def RitzMain():
    """Entry point - required!"""
    yield HighFive()
```

**Result:**
✅ Every example: copy template.html, change nothing
✅ Every example: builds to Main.wasm
✅ Consistent entry point: RitzMain()
✅ No more component name boilerplate

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

examples/highfive/HighFive.html

@@ -86,10 +86,10 @@ ritzInstance.exports.increment()</pre>
         // Wait for DOM to be ready
         if (document.readyState === 'loading') {
             document.addEventListener('DOMContentLoaded', () => {
-                new RitzLoader().load('HighFive.wasm', 'HighFive');
+                new RitzLoader().load('Main.wasm');
             });
         } else {
-            new RitzLoader().load('HighFive.wasm', 'HighFive');
+            new RitzLoader().load('Main.wasm');
         }
     </script>
 </body>

examples/highfive/HighFive.py

@@ -24,3 +24,9 @@ def HighFive():
 
         with Button(onclick=increment):
             yield "High Five!"
+
+
+@component
+def RitzMain():
+    """Entry point - required for all Ritz applications."""
+    yield HighFive()

examples/highfive/Main.ll

@@ -0,0 +1,114 @@
+; Generated by Ritz Framework with Signals
+; Components: HighFive, RitzMain
+
+; String constants
+@.str.0 = private unnamed_addr constant [13 x i8] c"High fives: \00"
+@.str.1 = private unnamed_addr constant [4 x i8] c"div\00"
+@.str.2 = private unnamed_addr constant [6 x i8] c"class\00"
+@.str.3 = private unnamed_addr constant [14 x i8] c"high-five-app\00"
+@.str.4 = private unnamed_addr constant [2 x i8] c"p\00"
+@.str.5 = private unnamed_addr constant [25 x i8] c"Give me a high five! ✋\00"
+@.str.6 = private unnamed_addr constant [6 x i8] c"count\00"
+@.str.7 = private unnamed_addr constant [7 x i8] c"button\00"
+@.str.8 = private unnamed_addr constant [6 x i8] c"click\00"
+@.str.9 = private unnamed_addr constant [10 x i8] c"increment\00"
+@.str.10 = private unnamed_addr constant [11 x i8] c"High Five!\00"
+
+; JavaScript bridge function declarations
+declare i32 @js_create_element(i8*)
+declare i32 @js_create_text(i8*)
+declare i32 @js_create_text_with_int(i8*, i32)
+declare void @js_append_child(i32, i32)
+declare void @js_set_attribute(i32, i8*, i8*)
+declare void @js_set_root(i32)
+declare void @js_bind_event(i32, i8*, i8*)
+declare void @js_update_text_content(i32, i8*)
+declare void @js_update_text_with_int(i32, i8*, i32)
+declare i32 @js_create_marker()
+declare void @js_replace_at_marker(i32, i32, i32)
+
+; Signal storage for HighFive (reactive state in WASM memory)
+@signal_HighFive_high_fives = global i32 0
+
+; Reactive text node storage for HighFive
+@reactive_text_HighFive_0_node = global i32 0
+
+; Signal helper functions
+define i32 @get_high_fives() {
+entry:
+  %val = load i32, i32* @signal_HighFive_high_fives
+  ret i32 %val
+}
+
+define void @set_high_fives(i32 %newval) {
+entry:
+  store i32 %newval, i32* @signal_HighFive_high_fives
+  ; TODO: Trigger DOM update callback
+  ret void
+}
+
+; Event handler: increment
+define void @increment() {
+entry:
+  %var0 = load i32, i32* @signal_HighFive_high_fives
+  %var1 = add i32 %var0, 1
+  store i32 %var1, i32* @signal_HighFive_high_fives
+  %var2 = load i32, i32* @reactive_text_HighFive_0_node
+  %var3 = getelementptr inbounds [13 x i8], [13 x i8]* @.str.0, i32 0, i32 0
+  %var4 = load i32, i32* @signal_HighFive_high_fives
+  call void @js_update_text_with_int(i32 %var2, i8* %var3, i32 %var4)
+  ret void
+}
+
+; Component render function
+define i32 @render_HighFive() {
+entry:
+  %var6 = getelementptr inbounds [4 x i8], [4 x i8]* @.str.1, i32 0, i32 0
+  %var5 = call i32 @js_create_element(i8* %var6)
+  %var7 = getelementptr inbounds [6 x i8], [6 x i8]* @.str.2, i32 0, i32 0
+  %var8 = getelementptr inbounds [14 x i8], [14 x i8]* @.str.3, i32 0, i32 0
+  call void @js_set_attribute(i32 %var5, i8* %var7, i8* %var8)
+  %var10 = getelementptr inbounds [2 x i8], [2 x i8]* @.str.4, i32 0, i32 0
+  %var9 = call i32 @js_create_element(i8* %var10)
+  %var11 = call i32 @js_create_text(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.5, i32 0, i32 0))
+  call void @js_append_child(i32 %var9, i32 %var11)
+  call void @js_append_child(i32 %var5, i32 %var9)
+  %var13 = getelementptr inbounds [2 x i8], [2 x i8]* @.str.4, i32 0, i32 0
+  %var12 = call i32 @js_create_element(i8* %var13)
+  %var14 = getelementptr inbounds [6 x i8], [6 x i8]* @.str.2, i32 0, i32 0
+  %var15 = getelementptr inbounds [6 x i8], [6 x i8]* @.str.6, i32 0, i32 0
+  call void @js_set_attribute(i32 %var12, i8* %var14, i8* %var15)
+  %var16 = getelementptr inbounds [13 x i8], [13 x i8]* @.str.0, i32 0, i32 0
+  %var17 = load i32, i32* @signal_HighFive_high_fives
+  %var18 = call i32 @js_create_text_with_int(i8* %var16, i32 %var17)
+  store i32 %var18, i32* @reactive_text_HighFive_0_node
+  call void @js_append_child(i32 %var12, i32 %var18)
+  call void @js_append_child(i32 %var5, i32 %var12)
+  %var20 = getelementptr inbounds [7 x i8], [7 x i8]* @.str.7, i32 0, i32 0
+  %var19 = call i32 @js_create_element(i8* %var20)
+  %var21 = getelementptr inbounds [6 x i8], [6 x i8]* @.str.8, i32 0, i32 0
+  %var22 = getelementptr inbounds [10 x i8], [10 x i8]* @.str.9, i32 0, i32 0
+  call void @js_bind_event(i32 %var19, i8* %var21, i8* %var22)
+  %var23 = call i32 @js_create_text(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.10, i32 0, i32 0))
+  call void @js_append_child(i32 %var19, i32 %var23)
+  call void @js_append_child(i32 %var5, i32 %var19)
+  ret i32 %var5
+}
+
+; Reactive text node storage for RitzMain
+@reactive_text_RitzMain_0_node = global i32 0
+
+; Component render function
+define i32 @render_RitzMain() {
+entry:
+  %var24 = call i32 @render_HighFive()
+  ret i32 %var24
+}
+
+; Main entry point
+define void @main() {
+entry:
+  %root = call i32 @render_RitzMain()
+  call void @js_set_root(i32 %root)
+  ret void
+}

examples/runtime/ritz-runtime.js

@@ -288,8 +288,14 @@ class RitzLoader {
         this.onError = options.onError || ((err) => console.error(err));
     }
 
-    async load(wasmPath, componentName, props = {}) {
+    async load(wasmPath, componentName = null, props = {}) {
         try {
+            // Auto-detect component name from wasm filename if not provided
+            if (!componentName) {
+                // Extract from path: "Main.wasm" → "Main", "path/to/Main.wasm" → "Main"
+                componentName = wasmPath.split('/').pop().replace('.wasm', '');
+            }
+
             this.setStatus('⏳ Creating runtime...');
             const runtime = new RitzRuntime(this.rootElement);
 

examples/runtime/styles.css

@@ -0,0 +1,100 @@
+/* Ritz Framework - Shared Example Styles */
+
+* {
+    box-sizing: border-box;
+}
+
+body {
+    margin: 0;
+    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
+    background: #f5f5f5;
+    color: #333;
+    line-height: 1.6;
+}
+
+#app {
+    max-width: 800px;
+    margin: 50px auto;
+    padding: 40px;
+    background: white;
+    border-radius: 8px;
+    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
+}
+
+#status {
+    position: fixed;
+    top: 20px;
+    right: 20px;
+    padding: 12px 20px;
+    background: #fff;
+    border: 1px solid #ddd;
+    border-radius: 6px;
+    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
+    font-size: 14px;
+}
+
+#status.success {
+    background: #d4edda;
+    border-color: #c3e6cb;
+    color: #155724;
+}
+
+#status.error {
+    background: #f8d7da;
+    border-color: #f5c6cb;
+    color: #721c24;
+}
+
+h1, h2, h3 {
+    margin-top: 0;
+    color: #222;
+}
+
+p {
+    margin: 15px 0;
+}
+
+button {
+    padding: 12px 24px;
+    font-size: 16px;
+    font-weight: 500;
+    background: #0066cc;
+    color: white;
+    border: none;
+    border-radius: 6px;
+    cursor: pointer;
+    transition: all 0.2s;
+}
+
+button:hover {
+    background: #0052a3;
+    transform: translateY(-1px);
+    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
+}
+
+button:active {
+    transform: translateY(0);
+    box-shadow: none;
+}
+
+input, select, textarea {
+    padding: 10px;
+    font-size: 16px;
+    border: 1px solid #ddd;
+    border-radius: 4px;
+    font-family: inherit;
+}
+
+input:focus, select:focus, textarea:focus {
+    outline: none;
+    border-color: #0066cc;
+    box-shadow: 0 0 0 3px rgba(0,102,204,0.1);
+}
+
+ul {
+    padding-left: 20px;
+}
+
+li {
+    margin: 8px 0;
+}

examples/template.html

@@ -3,45 +3,23 @@
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>{{TITLE}} - Ritz Framework</title>
+    <title>Ritz Example</title>
-    <link rel="stylesheet" href="../runtime/ritz-debug.css">
+    <link rel="stylesheet" href="../runtime/styles.css">
-    <link rel="stylesheet" href="{{COMPONENT}}.css">
 </head>
 <body>
     <div id="app"></div>
-    <div id="ritz-debug" class="ritz-debug hidden">
+    <div id="status"></div>
-        <div class="debug-header">
-            <h3>🎭 Ritz Debug</h3>
-            <button onclick="ritzDebug.toggle()">×</button>
-        </div>
-        <div id="status" class="status">Loading...</div>
-        <div class="debug-content">
-            <div class="debug-section">
-                <h4>Pipeline</h4>
-                <pre>{{COMPONENT}}.py → AST → IR → LLVM → WASM</pre>
-            </div>
-            <div class="debug-section">
-                <h4>Commands</h4>
-                <pre>ritzRuntime.getLog()
-ritzInstance.exports</pre>
-            </div>
-        </div>
-    </div>
 
     <script src="../runtime/ritz-runtime.js"></script>
-    <script src="../runtime/ritz-debug.js"></script>
     <script>
-        // Load component
+        // Load Main.wasm - automatically calls RitzMain() component
-        const loader = new RitzLoader({
+        if (document.readyState === 'loading') {
-            rootElement: document.getElementById('app'),
+            document.addEventListener('DOMContentLoaded', () => {
-            statusElement: document.getElementById('status'),
+                new RitzLoader().load('Main.wasm');
-            onLoad: (runtime, instance) => {
-                console.log('✅ Component loaded');
-                console.log('Debug: ritzRuntime, ritzInstance');
-            }
             });
-
+        } else {
-        loader.load('{{COMPONENT}}.wasm', '{{COMPONENT}}');
+            new RitzLoader().load('Main.wasm');
+        }
     </script>
 </body>
 </html>

ritz/build.py

@@ -39,7 +39,7 @@ def build_component(component_file: Path, output_file: Path, debug: bool = False
     print("  [3/4] Generating LLVM IR...")
     llvm_ir = generate_llvm_ir(ir)
 
-    # Save LLVM IR for inspection
+    # Save LLVM IR for inspection (always Main.ll)
     ll_file = output_file.with_suffix(".ll")
     ll_file.write_text(llvm_ir)
     print(f"    Saved LLVM IR: {ll_file}")
@@ -130,7 +130,8 @@ def main() -> None:
     if args.output:
         output_file = args.output
     else:
-        output_file = args.component.with_suffix(".wasm")
+        # Convention: always output Main.wasm in the same directory as the component
+        output_file = args.component.parent / "Main.wasm"
 
     # Ensure output directory exists
     output_file.parent.mkdir(parents=True, exist_ok=True)

ritz/llvm_codegen_signals.py

@@ -109,9 +109,13 @@ class SignalLLVMIRGenerator:
             self._emit_conditional_functions()
             self._emit_component(component)
 
-        # Emit main entry point for the last (top-level) component
+        # Emit main entry point - always looks for RitzMain component
-        if self.components:
+        ritz_main = next((c for c in self.components if c["name"] == "RitzMain"), None)
-            self._emit_main_entry(self.components[-1]["name"])
+        if not ritz_main:
+            raise ValueError(
+                "No RitzMain component found! Every Ritz file must have a @component def RitzMain() as entry point."
+            )
+        self._emit_main_entry()
 
         # Prepend string constants
         return self._finalize_with_strings()
@@ -425,15 +429,15 @@ class SignalLLVMIRGenerator:
         self.lines.append("")
 
     def _emit_reactive_text_globals(self) -> None:
-        """Emit global storage for reactive text node references."""
+        """Emit global storage for reactive text node references (scoped to component)."""
         if not self.reactive_text_nodes:
             return
 
-        self.lines.append("; Reactive text node storage")
+        self.lines.append(f"; Reactive text node storage for {self.current_component}")
         for text_info in self.reactive_text_nodes:
             text_id = text_info["id"]
-            # Store text node reference so we can update its content later
+            # Store text node reference so we can update its content later (scoped to component)
-            self.lines.append(f"@reactive_text_{text_id}_node = global i32 0")
+            self.lines.append(f"@reactive_text_{self.current_component}_{text_id}_node = global i32 0")
         self.lines.append("")
 
     def _emit_function_declarations(self) -> None:
@@ -629,9 +633,9 @@ class SignalLLVMIRGenerator:
         if not text_info:
             return  # Text node not found
 
-        # Load the text node reference
+        # Load the text node reference (scoped to component)
         node_var = self._new_var()
-        self.lines.append(f"  %{node_var} = load i32, i32* @reactive_text_{text_id}_node")
+        self.lines.append(f"  %{node_var} = load i32, i32* @reactive_text_{self.current_component}_{text_id}_node")
 
         # Build the f-string text
         result = self._build_fstring_text(text_info["fstring"])
@@ -933,12 +937,12 @@ class SignalLLVMIRGenerator:
         self.lines.append("}")
         self.lines.append("")
 
-    def _emit_main_entry(self, component_name: str) -> None:
+    def _emit_main_entry(self) -> None:
-        """Emit main entry point that renders top-level component and sets root."""
+        """Emit main entry point that renders RitzMain component and sets root."""
         self.lines.append("; Main entry point")
         self.lines.append("define void @main() {")
         self.lines.append("entry:")
-        self.lines.append(f"  %root = call i32 @render_{component_name}()")
+        self.lines.append("  %root = call i32 @render_RitzMain()")
         self.lines.append("  call void @js_set_root(i32 %root)")
         self.lines.append("  ret void")
         self.lines.append("}")
@@ -1376,8 +1380,8 @@ class SignalLLVMIRGenerator:
                     empty_ptr = self._emit_string_ptr("")
                     self.lines.append(f"  %{text_var} = call i32 @js_create_text(i8* {empty_ptr})")
 
-                # Store the text node reference for reactive updates
+                # Store the text node reference for reactive updates (scoped to component)
-                self.lines.append(f"  store i32 %{text_var}, i32* @reactive_text_{text_id}_node")
+                self.lines.append(f"  store i32 %{text_var}, i32* @reactive_text_{self.current_component}_{text_id}_node")
 
                 return text_var
             else: