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website/src/lib/components/export/utils.svelte.ts

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+import { getFile, settings } from '$lib/db';
+import { applyToOrderedSelectedItemsFromFile } from '$lib/components/file-list/Selection';
+import { get } from 'svelte/store';
+import { buildGPX, type GPXFile } from 'gpx';
+import FileSaver from 'file-saver';
+import JSZip from 'jszip';
+
+const { fileOrder } = settings;
+
+export enum ExportState {
+    NONE,
+    SELECTION,
+    ALL,
+}
+export const exportState = $state({
+    current: ExportState.NONE,
+});
+
+async function exportFiles(fileIds: string[], exclude: string[]) {
+    if (fileIds.length > 1) {
+        await exportFilesAsZip(fileIds, exclude);
+    } else {
+        const firstFileId = fileIds.at(0);
+        if (firstFileId != null) {
+            const file = getFile(firstFileId);
+            if (file) {
+                exportFile(file, exclude);
+            }
+        }
+    }
+}
+
+export async function exportSelectedFiles(exclude: string[]) {
+    const fileIds: string[] = [];
+    applyToOrderedSelectedItemsFromFile(async (fileId, level, items) => {
+        fileIds.push(fileId);
+    });
+    await exportFiles(fileIds, exclude);
+}
+
+export async function exportAllFiles(exclude: string[]) {
+    await exportFiles(get(fileOrder), exclude);
+}
+
+function exportFile(file: GPXFile, exclude: string[]) {
+    const blob = new Blob([buildGPX(file, exclude)], { type: 'application/gpx+xml' });
+    FileSaver.saveAs(blob, `${file.metadata.name}.gpx`);
+}
+
+async function exportFilesAsZip(fileIds: string[], exclude: string[]) {
+    const zip = new JSZip();
+    for (const fileId of fileIds) {
+        const file = getFile(fileId);
+        if (file) {
+            const gpx = buildGPX(file, exclude);
+            let filename = file.metadata.name;
+            for (let i = 1; zip.files[filename + '.gpx']; i++) {
+                filename = file.metadata.name + `-${i}`;
+            }
+            zip.file(filename + '.gpx', gpx);
+        }
+    }
+    if (Object.keys(zip.files).length > 0) {
+        const blob = await zip.generateAsync({ type: 'blob' });
+        FileSaver.saveAs(blob, 'gpx-files.zip');
+    }
+}