fix(docs): resolve VitePress example preview assets

Signed-off-by: yjlu12 <1064690083@qq.com>

Author: lyj715824

docs/.vitepress/examples.data.ts

@@ -1,6 +1,6 @@
 // Build-time data loader: reads the community workflow examples under examples/
 // and exposes their metadata to the docs site gallery.
-import { readFileSync } from "node:fs";
+import { existsSync, readFileSync } from "node:fs";
 import { basename, dirname } from "node:path";
 
 export interface ExampleMeta {
@@ -15,17 +15,12 @@ export interface ExampleMeta {
   event: string;
   repoPath: string; // e.g. examples/history-knowledge-qa
   hasPreview: boolean;
-  previewUrl: string;
+  previewPath: string;
 }
 
 declare const data: ExampleMeta[];
 export { data };
 
-const previewAssets = import.meta.glob("../../examples/*/preview.png", {
-  eager: true,
-  import: "default"
-}) as Record<string, string>;
-
 function parseFrontmatter(md: string): Record<string, string | string[]> | null {
   const m = md.match(/^---\r?\n([\s\S]*?)\r?\n---/);
   if (!m) return null;
@@ -64,6 +59,8 @@ export default {
       if (id === "TEMPLATE") continue;
       const fm = parseFrontmatter(readFileSync(file, "utf8"));
       if (!fm || !fm.id) continue;
+      const previewPath = `${dirname(file)}/preview.png`;
+      const hasPreview = existsSync(previewPath);
       examples.push({
         id: String(fm.id),
         title: String(fm.title ?? fm.id),
@@ -75,8 +72,8 @@ export default {
         dslVersion: String(fm.dslVersion ?? ""),
         event: String(fm.event ?? ""),
         repoPath: `examples/${id}`,
-        hasPreview: Boolean(previewAssets[`../../examples/${id}/preview.png`]),
-        previewUrl: previewAssets[`../../examples/${id}/preview.png`] ?? ""
+        hasPreview,
+        previewPath: hasPreview ? `examples/${id}/preview.png` : ""
       });
     }
     return examples.sort((a, b) => a.category.localeCompare(b.category) || a.title.localeCompare(b.title));

docs/.vitepress/theme/ExamplesGallery.vue

@@ -3,6 +3,19 @@ import { computed, ref } from "vue";
 import { useData } from "vitepress";
 import { data as examples } from "../examples.data";
 
+const previewAssets = import.meta.glob("../../../examples/*/preview.png", {
+  eager: true,
+  import: "default",
+  query: "?url"
+}) as Record<string, string>;
+
+const previewUrlsById = Object.fromEntries(
+  Object.entries(previewAssets).map(([path, url]) => {
+    const segments = path.split("/");
+    return [segments[segments.length - 2], url];
+  })
+);
+
 const REPO = "https://github.com/iflytek/astron-agent";
 const { lang } = useData();
 const isZh = computed(() => lang.value === "zh-CN");
@@ -38,6 +51,8 @@ const hideBrokenPreview = (id: string): void => {
   failedPreviews.value = new Set(failedPreviews.value).add(id);
 };
 
+const getPreviewUrl = (id: string): string => previewUrlsById[id] ?? "";
+
 const contributeHref = computed(() => (isZh.value ? "/zh/contribute-to-docs" : "/contribute-to-docs"));
 </script>
 
@@ -70,7 +85,7 @@ const contributeHref = computed(() => (isZh.value ? "/zh/contribute-to-docs" : "
         <img
           v-if="e.hasPreview && !failedPreviews.has(e.id)"
           class="exg__preview"
-          :src="e.previewUrl"
+          :src="getPreviewUrl(e.id)"
           :alt="`${e.title} workflow preview`"
           loading="lazy"
           @error="hideBrokenPreview(e.id)"