Greet the user with a message and create the project directory.

Author: KockaAdmiralac

extensions/includes/pull.mjs

@@ -7,13 +7,16 @@ import { addToPromise, isImageBackground } from './util.mjs';
 // Conflict with the DOM File type.
 const TiledFile = /** @type {any} */ (File);
 
+const PROJECT_FOLDER = tiled.project.folders[0];
+const IMAGES_FOLDER = FileInfo.joinPaths(PROJECT_FOLDER, 'images');
+
 /**
  * Gets the path to a map file based on its metadata.
  * @param {DataMaps} map Map for which to get the path
  * @returns {string} Path to the map file
  */
 function getMapPath(map) {
-    return FileInfo.joinPaths(tiled.project.folders[0], `${
+    return FileInfo.joinPaths(PROJECT_FOLDER, `${
         map.en.custom?.fileName ||
         map.en.custom?.interwiki?.en.mapName
     }.mw-datamaps`);
@@ -26,9 +29,7 @@ function getMapPath(map) {
  * @returns {string} Path to the background image
  */
 function getBackgroundPath(fileName) {
-    const imagesDir = FileInfo.joinPaths(tiled.project.folders[0], 'images');
-    TiledFile.makePath(imagesDir);
-    return FileInfo.joinPaths(imagesDir, fileName);
+    return FileInfo.joinPaths(IMAGES_FOLDER, fileName);
 }
 
 /**
@@ -319,6 +320,20 @@ tiled.assetOpened.connect(asset => {
         });
 });
 
+if (!TiledFile.exists(PROJECT_FOLDER)) {
+    tiled.alert(`Looks like you are just setting up this Tiled project. Welcome! This is a message from the Tiled-DataMaps extension that allows for easy publishing of interactive maps to MediaWiki wikis from Tiled (https://github.com/utdrwiki/maps).
+
+Maps from the wiki will download in a few seconds - please use Project > Refresh Folders or restart Tiled to see them in the map sidebar.
+
+If you have any questions, please read the instructions at https://undertale.wiki/d/t/interactive-maps-project/318 first! You can leave any questions over there, or at the Undertale/Deltarune Wiki Discord server (https://undertale.wiki/UT:D, channel #wiki-discussion, thread "Interactive Maps Project").
+
+This extension is primarily meant for Undertale, Deltarune and Undertale Yellow wikis. You can ask for support over Discord or Discussions even if you're editing some other wiki, but when implementing features or fixes our own wikis take priority.
+`);
+}
+
+TiledFile.makePath(PROJECT_FOLDER);
+TiledFile.makePath(IMAGES_FOLDER);
+
 Promise.all(getLanguageCodes().map(language => addToPromise(getAllMaps(language), language)))
     .then(mapsByLanguage => {
         const diffMaps = getDiffMaps(collectMaps(mapsByLanguage))