adds trail export

web/src/lib/util/file_util.ts

@@ -17,3 +17,14 @@ export function readAsDataURLAsync(file: File) {
         fr.readAsDataURL(file);
     });
 }
+
+export function saveAs(data: Blob, fileName: string) {
+    var a = document.createElement("a") as HTMLAnchorElement;
+    a.setAttribute("style", "display: none");
+    document.body.appendChild(a);
+    const url = window.URL.createObjectURL(data);
+    a.href = url;
+    a.download = fileName;
+    a.click();
+    window.URL.revokeObjectURL(url);
+};

web/src/lib/util/gpx_util.ts

@@ -1,9 +1,11 @@
 import GPX from "$lib/models/gpx/gpx";
 import { Trail } from "$lib/models/trail";
 import { Waypoint } from "$lib/models/waypoint";
+import { currentUser } from "$lib/stores/user_store";
 import GeoJsonToGpx from "$lib/vendor/geoJSONToGPX";
 import { kml, tcx } from "$lib/vendor/toGeoJSON/toGeoJSON";
 import cryptoRandomString from "crypto-random-string";
+import { get } from "svelte/store";
 
 export async function gpx2trail(gpxString: string) {
     const gpx = await GPX.parse(gpxString);
@@ -18,7 +20,7 @@ export async function gpx2trail(gpxString: string) {
 
     trail.description = gpx.metadata?.desc;
 
-    for (const wpt of gpx.wpt ?? []) {               
+    for (const wpt of gpx.wpt ?? []) {
         const wp = new Waypoint(wpt.$.lat ?? 0, wpt.$.lon ?? 0);
         wp.id = cryptoRandomString({ length: 15 });
         wp.name = wpt.name
@@ -29,13 +31,13 @@ export async function gpx2trail(gpxString: string) {
     const totals = gpx.getTotals()
 
     const trackPoints = gpx.trk?.at(0)?.trkseg?.at(0)?.trkpt
-    const routePoints = gpx.rte?.at(0)?.rtept;    
+    const routePoints = gpx.rte?.at(0)?.rtept;
 
-    const startPoint = trackPoints?.at(0) ?? routePoints?.at(0);    
+    const startPoint = trackPoints?.at(0) ?? routePoints?.at(0);
     if (startPoint) {
         trail.lat = startPoint.$.lat
         trail.lon = startPoint.$.lon
-    }    
+    }
 
     const startTime = trackPoints?.at(0)?.time;
     const endTime = trackPoints?.at((trackPoints?.length ?? 1) - 1)?.time
@@ -49,7 +51,44 @@ export async function gpx2trail(gpxString: string) {
     trail.elevation_gain = totals.elevationGain;
     trail.distance = totals.distance
 
-    return {gpx: gpx, trail: trail}
+    return { gpx: gpx, trail: trail }
+}
+
+export async function trail2gpx(trail: Trail) {
+    if (!trail.expand.gpx_data) {
+        throw Error("Trail has no GPX data")
+    }
+    const gpx = await GPX.parse(trail.expand.gpx_data) as GPX;
+
+    if (gpx instanceof Error) {
+        throw gpx;
+    }
+
+    gpx.metadata = {
+        name: trail.name,
+        desc: trail.description ?? "",
+        time: trail.date ? new Date(trail.date) : new Date(),
+        keywords: `${trail.category ?? ""}, ${trail.location ?? ""}`,
+        author: { name: trail.author ?? "", email: get(currentUser)?.email ?? "" }
+    }
+
+    if(!gpx.wpt) {
+        gpx.wpt = [];
+    }
+
+    for (const wp of trail.expand.waypoints) {
+        const gpxWpt = gpx.wpt.find((w) => w.$.lat == wp.lat && w.$.lon == wp.lon)
+        if(!gpxWpt) {
+            gpx.wpt.push({
+                $: {
+                    lat: wp.lat,
+                    lon: wp.lon
+                }
+            })
+        }
+    }
+
+    return gpx.toString();
 }
 
 export function fromKML(kmlData: string) {