1 files changed, 25 insertions, 0 deletions
diff --git a/src/lib/Saving.ts b/src/lib/Saving.ts
new file mode 100644
index 0000000..0d71057
--- /dev/null
+++ b/src/lib/Saving.ts
@@ -0,0 +1,25 @@
+import type { Grid } from "./Sudoku";
+
+export function save(grid: Grid) {
+  const a = document.createElement("a");
+  const fileParts = [JSON.stringify(grid)];
+  const blob = new Blob(fileParts, { type: 'application/json' }); // the blob
+  a.href = URL.createObjectURL(blob);
+  a.download = "sudoku-save.json";
+  a.click();
+}
+export function readGridFromFile(f: File): Promise<string[][] | null> {
+  return new Promise(res => {
+    let reader = new FileReader();
+    reader.onload = e => {
+      try {
+        //@ts-expect-error
+        const json = JSON.parse(e.target.result);
+        res(json)
+      } catch (error) {
+        res(null)
+      }
+    };
+    reader.readAsText(f);
+  })
+}