1 files changed, 25 insertions, 0 deletions
diff --git a/src/utils/web.ts b/src/utils/web.ts
index 9cfe718..5c46aec 100644
--- a/src/utils/web.ts
+++ b/src/utils/web.ts
@@ -16,6 +16,10 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
+/**
+ * Prompts the user to save a file to their system
+ * @param file The file to save
+ */
 export function saveFile(file: File) {
     const a = document.createElement("a");
     a.href = URL.createObjectURL(file);
@@ -28,3 +32,24 @@ export function saveFile(file: File) {
         document.body.removeChild(a);
     });
 }
+
+/**
+ * Prompts the user to choose a file from their system
+ * @param mimeTypes A comma separated list of mime types to accept, see https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/accept#unique_file_type_specifiers
+ * @returns A promise that resolves to the chosen file or null if the user cancels
+ */
+export function chooseFile(mimeTypes: string) {
+    return new Promise<File | null>(resolve => {
+        const input = document.createElement("input");
+        input.type = "file";
+        input.style.display = "none";
+        input.accept = mimeTypes;
+        input.onchange = async () => {
+            resolve(input.files?.[0] ?? null);
+        };
+
+        document.body.appendChild(input);
+        input.click();
+        setImmediate(() => document.body.removeChild(input));
+    });
+}