feat: allow path as function

playground/vite.config.ts

@@ -85,10 +85,19 @@ export default defineConfig({
           // ignores .vue files
           extensions: ['.md'],
         },
-        // {
-        //   src: 'src/features/',
-        //   path: 'features-prefix/',
-        // },
+        {
+          src: 'src/features',
+          filePatterns: '*/pages/**/*',
+          path: (file) => {
+            const prefix = 'src/features'
+            // +1 for the starting slash
+            file = file
+              .slice(file.lastIndexOf(prefix) + prefix.length + 1)
+              .replace('/pages', '')
+            console.log('👉 FILE', file)
+            return file
+          },
+        },
       ],
       logs: true,
       // getRouteName: getPascalCaseRouteName,

src/core/RoutesFolderWatcher.ts

@@ -12,7 +12,7 @@ import { appendExtensionListToPattern, asRoutePath } from './utils'
 
 export class RoutesFolderWatcher {
   src: string
-  path: string
+  path: string | ((filepath: string) => string)
   extensions: string[]
   filePatterns: string[]
   exclude: string[]

src/core/context.ts

@@ -79,21 +79,19 @@ export function createRoutesContext(options: ResolvedOptions) {
             // TODO: do they return the symbolic link path or the original file?
             // followSymbolicLinks: false,
             ignore: ignorePattern,
-          })
-            .then((files) => files.map((file) => resolve(folder.src, file)))
-            .then((files) =>
-              Promise.all(
-                files
-                  // ensure consistent files in Windows/Unix and absolute paths
-                  .map((file) => resolve(folder.src, file))
-                  .map((file) =>
-                    addPage({
-                      routePath: asRoutePath(folder, file),
-                      filePath: file,
-                    })
-                  )
-              )
+          }).then((files) =>
+            Promise.all(
+              files
+                // ensure consistent files in Windows/Unix and absolute paths
+                .map((file) => resolve(folder.src, file))
+                .map((file) =>
+                  addPage({
+                    routePath: asRoutePath(folder, file),
+                    filePath: file,
+                  })
+                )
             )
+          )
         })
     )
 

src/core/utils.ts

@@ -244,12 +244,12 @@ export function asRoutePath(
   { src, path = '' }: RoutesFolderOption,
   filePath: string
 ) {
-  return (
-    // add the path prefix if any
-    path +
-    // remove the absolute path to the pages folder
-    filePath.slice(src.length + 1)
-  )
+  return typeof path === 'string'
+    ? // add the path prefix if any
+      path +
+        // remove the absolute path to the pages folder
+        filePath.slice(src.length + 1)
+    : path(filePath)
 }
 
 /**

src/options.ts

@@ -7,15 +7,37 @@ import { ParseSegmentOptions } from './core/treeNodeValue'
 
 export interface RoutesFolderOption {
   /**
-   * Path to the folder containing the components that should be used for routes.
+   * Folder to scan files that should be used for routes. **Cannot be a glob**, use the `path`, `filePatterns`, and
+   * `exclude` options to filter out files. This section will **be removed** from the resulting path.
    */
   src: string
 
-  // TODO: allow a function to customize based on the filepath
   /**
-   * Prefix to add to the route path **as is**. You might need to end with a slash. Defaults to `''`.
+   * Prefix to add to the route path **as is**. Defaults to `''`. Can also be a function
+   * to reuse parts of the filepath, in that case you should return a **modified version of the filepath**.
+   *
+   * @example
+   * ```js
+   * {
+   *   src: 'src/pages',
+   *   // this is equivalent to the default behavior
+   *   path: (file) => file.slice(file.lastIndexOf('src/pages') + 'src/pages'.length
+   * },
+   * {
+   *   src: 'src/features',
+   *   // match all files (note the \ is not needed in real code)
+   *   filePatterns: '*‍/pages/**\/',
+   *   path: (file) => {
+   *     const prefix = 'src/features'
+   *     // remove the everything before src/features and removes /pages
+   *     // /src/features/feature1/pages/index.vue -> feature1/index.vue
+   *     return file.slice(file.lastIndexOf(prefix) + prefix.length + 1).replace('/pages', '')
+   *   },
+   * },
+   * ```
+   *
    */
-  path?: string
+  path?: string | ((filepath: string) => string)
 
   /**
    * Allows to override the global `filePattern` option for this folder. It can also extend the global values by passing
@@ -40,7 +62,7 @@ export interface RoutesFolderOption {
  * Normalized options for a routes folder.
  */
 export interface RoutesFolderOptionResolved extends RoutesFolderOption {
-  path: string
+  path: string | ((filepath: string) => string)
   /**
    * Final glob pattern to match files in the folder.
    */