factors out body and slug in getEntryInfo()

src/index.ts

@@ -48,11 +48,15 @@ export default function gemtext(config: GemtextConfig = {}): AstroIntegration {
                         } catch { }
                       }
 
+                      const body = lines.slice(bodyStartLineIndex).join('\n');
+
+                      const slug = typeof data['slug'] === 'string' ? data['slug'] : fileUrl.pathname;
+
                       return {
                         data,
                         rawData: frontmatter,
-                        body: lines.slice(bodyStartLineIndex).join('\n'),
+                        body,
-                        slug: typeof data['slug'] === 'string' ? data['slug'] : fileUrl.pathname,
+                        slug,
                       };
                     },
                 })