fix(exclude): revert absolute path value for buildDir (#31)

Author: erezrokah

index.js

@@ -1,19 +1,19 @@
-const { join } = require('path')
-
 /* Generates a sitemap */
 const makeSitemap = require('./make_sitemap')
 
 module.exports = {
   onPostBuild: async ({ constants, inputs, utils }) => {
     const baseUrl = inputs.baseUrl || process.env.URL
     // Backwards compat... Correct opt is buildDir
-    const buildDir = join(process.cwd(), inputs.dir || inputs.distPath || inputs.buildDir || constants.PUBLISH_DIR)
+    const buildDir = inputs.dir || inputs.distPath || inputs.buildDir || constants.PUBLISH_DIR
+    // remove leading / to treat the dir a a relative one
+    const trimmedBuildDir = buildDir.startsWith('/') ? buildDir.slice(1) : buildDir
 
     console.log('Creating sitemap from files...')
 
     const data = await makeSitemap({
       homepage: baseUrl,
-      distPath: buildDir,
+      distPath: trimmedBuildDir,
       exclude: inputs.exclude,
       prettyURLs: inputs.prettyURLs,
       changeFreq: inputs.changeFreq,