Add Help Menu in NodeLibrarySidebarTab (#3922)

Co-authored-by: github-actions <github-actions@github.com>
Co-authored-by: Claude <noreply@anthropic.com>

src/services/nodeHelpService.ts

@@ -0,0 +1,59 @@
+import { api } from '@/scripts/api'
+import type { ComfyNodeDefImpl } from '@/stores/nodeDefStore'
+import { NodeSourceType, getNodeSource } from '@/types/nodeSource'
+import { extractCustomNodeName } from '@/utils/nodeHelpUtil'
+
+export class NodeHelpService {
+  async fetchNodeHelp(node: ComfyNodeDefImpl, locale: string): Promise<string> {
+    const nodeSource = getNodeSource(node.python_module)
+
+    if (nodeSource.type === NodeSourceType.CustomNodes) {
+      return this.fetchCustomNodeHelp(node, locale)
+    } else {
+      return this.fetchCoreNodeHelp(node, locale)
+    }
+  }
+
+  private async fetchCustomNodeHelp(
+    node: ComfyNodeDefImpl,
+    locale: string
+  ): Promise<string> {
+    const customNodeName = extractCustomNodeName(node.python_module)
+    if (!customNodeName) {
+      throw new Error('Invalid custom node module')
+    }
+
+    // Try locale-specific path first
+    const localePath = `/extensions/${customNodeName}/docs/${node.name}/${locale}.md`
+    let res = await fetch(api.fileURL(localePath))
+
+    if (!res.ok) {
+      // Fall back to non-locale path
+      const fallbackPath = `/extensions/${customNodeName}/docs/${node.name}.md`
+      res = await fetch(api.fileURL(fallbackPath))
+    }
+
+    if (!res.ok) {
+      throw new Error(res.statusText)
+    }
+
+    return res.text()
+  }
+
+  private async fetchCoreNodeHelp(
+    node: ComfyNodeDefImpl,
+    locale: string
+  ): Promise<string> {
+    const mdUrl = `/docs/${node.name}/${locale}.md`
+    const res = await fetch(api.fileURL(mdUrl))
+
+    if (!res.ok) {
+      throw new Error(res.statusText)
+    }
+
+    return res.text()
+  }
+}
+
+// Export singleton instance
+export const nodeHelpService = new NodeHelpService()