refactoring

frontend/docs/IMPROVEMENTS.md

@@ -0,0 +1,47 @@
+# Codebase simplification and design patterns
+
+This doc summarizes recent improvements and suggested next steps for readability, extension, and consistency.
+
+## Done
+
+### 1. Single place for template/reachability (DRY)
+
+- **Added** `lib/graph/templateRefs.ts`: `isReachable`, `resolveExtendsRef`, `getTemplateRefs`.
+- **Refactored** `config/renderingLogic.ts` and `useRenderingNodeState.ts` to use these helpers instead of duplicating the same logic.
+- **Pattern:** Extract shared pure helpers into a small lib module; keep call sites thin and consistent.
+
+### 2. Naming and comments
+
+- **Renamed** `outputMenuRegistry.tsx` → `outputMenuHandlers.tsx` (no registry, only helpers).
+- **Updated** `rendering.ts` and `sourceRenderingLogic.ts`: output menu is described as coming from the node descriptor (`getOutputMenuContent`), not a separate registry.
+- **Documented** `NodeMenubar`: extra content can come from props or from the descriptor (`getNodeMenuExtraContent`).
+- **Documented** `nodeTypes.ts`: clarifies React Flow types vs node type id (nodeRegistry).
+
+### 3. Central pipeline entry
+
+- **rendering.ts** documents the 3-step pipeline, how to add a source/output type, and points to `templateRefs.ts` for shared helpers.
+
+## Design patterns in use
+
+| Pattern        | Where                                      |
+|----------------|--------------------------------------------|
+| **Registry**   | nodeRegistry, sourceRenderingLogic         |
+| **Builder**    | nodeTypeBuilder (descriptor per node type) |
+| **Pipeline**   | Resolve → Render → Display (rendering.ts)   |
+| **Strategy**   | Source logic per node type; output menu per descriptor |
+| **Shared helpers** | templateRefs, outputMenuHandlers, renderingUtils |
+
+## Suggested next steps
+
+1. **CanvasPage** (~950 lines): Split into smaller units, e.g.:
+   - `useCanvasGraph()` or similar for graph state and connection rules.
+   - A dedicated component for the context menu (add node, paste, etc.).
+   - Keeps CanvasPage as composition + layout.
+
+2. **useRenderingNodeState**: Consider extracting:
+   - Signature building (config/edges/variables/functions/data) into a pure function or small module, e.g. `buildSourceSignatures(nodes, edges, id, incomingIds, getConfigContent)`.
+   - Makes the hook easier to read and the logic testable in isolation.
+
+3. **Config types**: If you add more output types (e.g. Mermaid), consider a small registry API (`registerConfigType`, `getConfigType`) instead of a single large `CONFIG_TYPES` array, so extensions can register without editing the core list.
+
+4. **Consistent node shape in lib**: `templateRefs` uses `EdgeLike` / `NodeLike`; other graph code uses inline `{ source, target }` or `nodes as ...`. You could standardize on the same minimal types where appropriate to reduce casts.

frontend/src/components/graph/NodeMenubar.tsx

@@ -1,3 +1,8 @@
+/**
+ * Per-node menubar (Node, Output, Data, Inputs, Insert). Content can be passed as props
+ * or resolved from the node type descriptor: when nodeMenuExtraContent is not provided,
+ * it is taken from getNodeType(nodeType)?.getNodeMenuExtraContent?.(nodeId, data).
+ */
 import React, { useCallback, useContext, useMemo } from 'react'
 import FlowContext from '@/lib/graph/flowContext'
 import { getNodeType } from '@/lib/graph/nodeRegistry'

frontend/src/components/nodes/config/descriptor.tsx

@@ -13,7 +13,7 @@ import {
 import { getResolvedContentForConfig } from './renderingLogic'
 import type { NodeTypeDescriptor } from '@/lib/graph/nodeRegistry'
 import ConfigNode from './ConfigNode'
-import { createImageExportHandlers, type OutputMenuContext } from '@/components/nodes/render/outputMenuRegistry'
+import { createImageExportHandlers, type OutputMenuContext } from '@/components/nodes/render/outputMenuHandlers'
 
 const ICON_CLASS = 'mr-2 h-4 w-4'
 

frontend/src/components/nodes/config/renderingLogic.ts

@@ -7,43 +7,11 @@
 import nunjucks from 'nunjucks'
 import type { ResolvedContentResult, SourceRenderingLogicContext } from '@/lib/graph/rendering'
 import { getConfigContent, getConfigType, getConfigTypeId, type ConfigTypeId } from '@/lib/graph/rendering'
+import { isReachable, resolveExtendsRef, getTemplateRefs } from '@/lib/graph/templateRefs'
 
 type Node = { id: string; type?: string; data?: unknown }
 type Edge = { id: string; source: string; target: string }
 
-function isReachable(edges: Edge[], startId: string, targetId: string): boolean {
-  const q: string[] = [startId]
-  const seen = new Set<string>([startId])
-  while (q.length) {
-    const cur = q.shift()!
-    if (cur === targetId) return true
-    for (const e of edges) {
-      if (e.source === cur && !seen.has(e.target)) {
-        seen.add(e.target)
-        q.push(e.target)
-      }
-    }
-  }
-  return false
-}
-
-function resolveExtendsRef(nodes: Node[], name: string): string {
-  const refName = name.replace(/\.(puml|html)$/, '').trim()
-  return nodes.find((n) => n.id === refName || (n.data as Record<string, unknown>)?.title === refName)?.id ?? refName
-}
-
-function getTemplateRefs(content: string): string[] {
-  const refs: string[] = []
-  const extendMatch = content.match(/\{\%\s*extends\s+["']([^"']+)["']\s*\%\}/)
-  if (extendMatch) refs.push(extendMatch[1].trim())
-  const includeRegex = /\{\%\s*include\s+["']([^"']+)["']\s*\%\}/g
-  let m
-  while ((m = includeRegex.exec(content)) !== null) refs.push(m[1].trim())
-  const importRegex = /\{\%\s*import\s+["']([^"']+)["']\s+as\s+\w+\s*\%\}/g
-  while ((m = importRegex.exec(content)) !== null) refs.push(m[1].trim())
-  return refs
-}
-
 export async function getResolvedContentForConfig(context: SourceRenderingLogicContext): Promise<ResolvedContentResult> {
   const { nodes, edges, sourceNodeId, renderNodeId } = context
   const srcId = sourceNodeId
@@ -56,11 +24,11 @@ export async function getResolvedContentForConfig(context: SourceRenderingLogicC
   const configIdsUsed = new Set<string>()
 
   const addConfigAndRefs = (templateName: string, visited = new Set<string>()) => {
-    const refId = resolveExtendsRef(nodes, templateName)
+    const refId = resolveExtendsRef(nodes as { id: string; data?: unknown }[], templateName)
     if (visited.has(refId)) throw new Error(`Circular reference detected: ${templateName}`)
     const node = nodes.find((n) => n.id === refId && n.type === 'config')
     if (!node) throw new Error(`Config not found: ${templateName}`)
-    if (refId !== srcId && !isReachable(edges, refId, id))
+    if (refId !== srcId && !isReachable(edges as { source: string; target: string }[], refId, id))
       throw new Error(`Referenced config not connected to renderer: ${templateName}`)
     visited.add(refId)
     configIdsUsed.add(refId)
@@ -72,10 +40,10 @@ export async function getResolvedContentForConfig(context: SourceRenderingLogicC
 
   const configLoader = {
     getSource: (name: string): { src: string; path: string } | null => {
-      const refId = resolveExtendsRef(nodes, name)
+      const refId = resolveExtendsRef(nodes as { id: string; data?: unknown }[], name)
       const node = nodes.find((n) => n.id === refId && n.type === 'config')
       if (!node) return null
-      if (refId !== srcId && !isReachable(edges, refId, id))
+      if (refId !== srcId && !isReachable(edges as { source: string; target: string }[], refId, id))
         throw new Error(`Referenced config not connected to renderer: ${name}`)
       return {
         src: getConfigContent((node.data ?? undefined) as Record<string, unknown> | undefined),

frontend/src/components/nodes/render/index.ts

@@ -1,4 +1,4 @@
 export { default as RenderingNode, type RenderingNodeData } from './RenderingNode'
 export { getRenderNodeDescriptor } from './descriptor'
-export { createImageExportHandlers } from './outputMenuRegistry'
+export { createImageExportHandlers } from './outputMenuHandlers'
-export type { OutputMenuContext } from './outputMenuRegistry'
+export type { OutputMenuContext } from './outputMenuHandlers'

frontend/src/components/nodes/render/useRenderingNodeState.ts

@@ -20,6 +20,7 @@ import {
     processSvgDisplay,
     stripTemplateSyntax,
 } from '@/lib/graph/rendering'
+import { isReachable, resolveExtendsRef, getTemplateRefs } from '@/lib/graph/templateRefs'
 import type { ConfigTypeId, SourceRenderingLogicContext } from '@/lib/graph/rendering'
 
 export type RenderingNodeData = {
@@ -136,54 +137,22 @@ export function useRenderingNodeState(
               : ''
 
     const connectedNodeIds = useMemo(() => {
+        const edgeList = edges as { source: string; target: string }[]
+        const nodeList = nodes as { id: string; type?: string; data?: unknown }[]
         const out = new Set<string>()
-        const isReachable = (startId: string, targetId: string) => {
-            const q: string[] = [startId]
-            const seen = new Set<string>([startId])
-            while (q.length) {
-                const cur = q.shift()!
-                if (cur === targetId) return true
-                for (const e of edges as { source: string; target: string }[]) {
-                    if (e.source === cur && !seen.has(e.target)) {
-                        seen.add(e.target)
-                        q.push(e.target)
-                    }
-                }
-            }
-            return false
-        }
-        const resolveRef = (name: string) => {
-            const refName = name.replace(/\.(puml|html)$/, '').trim()
-            return (nodes as { id: string; data?: { title?: string } }[]).find(
-                (n) => n.id === refName || n.data?.title === refName
-            )?.id ?? refName
-        }
-        const getTemplateRefs = (content: string): string[] => {
-            const refs: string[] = []
-            const extendMatch = content.match(/\{\%\s*extends\s+["']([^"']+)["']\s*\%\}/)
-            if (extendMatch) refs.push(extendMatch[1].trim())
-            const includeRegex = /\{\%\s*include\s+["']([^"']+)["']\s*\%\}/g
-            let m
-            while ((m = includeRegex.exec(content)) !== null) refs.push(m[1].trim())
-            const importRegex = /\{\%\s*import\s+["']([^"']+)["']\s+as\s+\w+\s*\%\}/g
-            while ((m = importRegex.exec(content)) !== null) refs.push(m[1].trim())
-            return refs
-        }
         const addConfigRefs = (nodeId: string, visited: Set<string>) => {
             if (visited.has(nodeId)) return
-            const node = (nodes as { id: string; type?: string; data?: unknown }[]).find(
+            const node = nodeList.find((n) => n.id === nodeId && n.type === 'config')
-                (n) => n.id === nodeId && n.type === 'config'
-            )
             if (!node) return
             visited.add(nodeId)
             out.add(nodeId)
             const content = getConfigContent((node.data ?? undefined) as Record<string, unknown> | undefined)
             for (const ref of getTemplateRefs(content)) {
-                const refId = resolveRef(ref)
+                const refId = resolveExtendsRef(nodeList, ref)
                 if (
                     refId &&
-                    (nodes as { id: string; type?: string }[]).some((n) => n.id === refId && n.type === 'config') &&
+                    nodeList.some((n) => n.id === refId && n.type === 'config') &&
-                    isReachable(refId, id)
+                    isReachable(edgeList, refId, id)
                 ) {
                     addConfigRefs(refId, visited)
                 }
@@ -191,11 +160,11 @@ export function useRenderingNodeState(
         }
         const configVisited = new Set<string>()
         for (const nid of incomingIds) {
-            const node = (nodes as { id: string; type?: string }[]).find((n) => n.id === nid)
+            const node = nodeList.find((n) => n.id === nid)
             if (node?.type === 'config') addConfigRefs(nid, configVisited)
             else out.add(nid)
         }
-        for (const e of edges as { source: string; target: string }[]) {
+        for (const e of edgeList) {
             if (out.has(e.target)) out.add(e.source)
         }
         return out

frontend/src/lib/graph/nodeTypes.ts

@@ -1,5 +1,7 @@
 /**
- * Central node and edge types for the app. Use AppNode / AppEdge in graph state and context.
+ * React Flow node/edge types for the app (graph state and context). AppNode / AppEdge
+ * describe the shape of nodes and edges; the node type *id* (e.g. 'config', 'render')
+ * lives in nodeRegistry and is stored as node.type.
  */
 
 import type { Node, Edge } from '@xyflow/react'

frontend/src/lib/graph/rendering.ts

@@ -13,15 +13,20 @@
  *
  * 3. **Display** — The Rendering node picks a view (image viewport vs markdown content)
  *    from `outputType` on the renderer and shows the result. Output menu items (e.g. Export)
- *    come from the source/renderer via `outputMenuDescriptor`.
+ *    come from the source node descriptor's getOutputMenuContent (see NodeTypeDescriptor).
  *
  * ## Implementing a new source
- * - Implement `IRenderingSource` (resolve + optional output menu).
+ * - Implement source rendering logic (resolve step) and set it on the node descriptor
- * - Register with `registerSourceRenderingLogic(nodeType, logic)`.
+ *   via .sourceRenderingLogic(). Optionally set .outputMenuContent() for the Output menu.
+ * - The descriptor is registered via registerNodeType(); source logic is registered automatically.
  *
  * ## Implementing a new output type
  * - Add a config type (or equivalent) fulfilling `IOutputTypeRenderer`.
  * - Register in CONFIG_TYPES and use `getConfigType(id)` in the resolve step.
+ *
+ * ## Shared helpers
+ * - templateRefs.ts: isReachable, resolveExtendsRef, getTemplateRefs (Nunjucks extends/include/import).
+ *   Used by config resolve and the rendering node hook so template/reachability logic stays in one place.
  */
 
 import type {
@@ -60,8 +65,7 @@ export interface IResolveResult {
 
 /**
  * Contract for a node type that can feed the Rendering node (config, agent, etc.).
- * Register via registerSourceRenderingLogic(nodeType, logic).
+ * Set on the node descriptor via .sourceRenderingLogic(); output menu via .outputMenuContent().
- * Output menu content is registered per output type in the frontend (outputMenuRegistry).
  */
 export interface IRenderingSource {
   /** When to re-run: 'auto' on upstream changes, 'manual' only on Run. */

frontend/src/lib/graph/sourceRenderingLogic.ts

@@ -30,7 +30,7 @@ export type ResolvedContentResult = {
   reasoning?: string
 }
 
-/** Source logic implementation. Implements {@link IRenderingSource}. Output menu content is provided per output type via the frontend registry (see outputMenuRegistry). */
+/** Source logic implementation. Implements {@link IRenderingSource}. Output menu is provided by the node descriptor's getOutputMenuContent. */
 export type SourceRenderingLogic = {
   defaultUpdateMode: 'auto' | 'manual'
   getResolvedContent: (context: SourceRenderingLogicContext) => Promise<ResolvedContentResult>

frontend/src/lib/graph/templateRefs.ts

@@ -0,0 +1,54 @@
+/**
+ * Shared helpers for Nunjucks template references (extends/include/import) and
+ * graph reachability. Used by config resolve logic and the rendering node hook
+ * so template parsing and "connected configs" stay in one place.
+ */
+
+export type EdgeLike = { source: string; target: string }
+export type NodeLike = { id: string; data?: unknown }
+
+/** BFS: is target reachable from start following directed edges? */
+export function isReachable(
+  edges: EdgeLike[],
+  startId: string,
+  targetId: string
+): boolean {
+  const q: string[] = [startId]
+  const seen = new Set<string>([startId])
+  while (q.length) {
+    const cur = q.shift()!
+    if (cur === targetId) return true
+    for (const e of edges) {
+      if (e.source === cur && !seen.has(e.target)) {
+        seen.add(e.target)
+        q.push(e.target)
+      }
+    }
+  }
+  return false
+}
+
+/** Resolve a template name to a node id (by id or by data.title). */
+export function resolveExtendsRef(nodes: NodeLike[], name: string): string {
+  const refName = name.replace(/\.(puml|html)$/, '').trim()
+  return (
+    nodes.find(
+      (n) =>
+        n.id === refName ||
+        (n.data as Record<string, unknown>)?.title === refName
+    )?.id ?? refName
+  )
+}
+
+/** Extract template refs from content: extends "x", include "y", import "z" as ... */
+export function getTemplateRefs(content: string): string[] {
+  const refs: string[] = []
+  const extendMatch = content.match(/\{\%\s*extends\s+["']([^"']+)["']\s*\%\}/)
+  if (extendMatch) refs.push(extendMatch[1].trim())
+  const includeRegex = /\{\%\s*include\s+["']([^"']+)["']\s*\%\}/g
+  let m
+  while ((m = includeRegex.exec(content)) !== null) refs.push(m[1].trim())
+  const importRegex = /\{\%\s*import\s+["']([^"']+)["']\s+as\s+\w+\s*\%\}/g
+  while ((m = importRegex.exec(content)) !== null) refs.push(m[1].trim())
+  return refs
+}