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website/src/lib/default-file-name.ts

@@ -0,0 +1,19 @@
+/**
+ * The name of a new file: the default name (translated), followed by a number when other files
+ * already have a default name (the name alone counts as number 1): "New file", "New file 2",
+ * "New file 3"...
+ */
+export function defaultFileName(defaultName: string, existingNames: string[]): string {
+    let highest = 0;
+    for (const name of existingNames) {
+        if (name === defaultName) {
+            highest = Math.max(highest, 1);
+        } else if (name.startsWith(`${defaultName} `)) {
+            const suffix = name.slice(defaultName.length + 1);
+            if (/^[1-9][0-9]*$/.test(suffix)) {
+                highest = Math.max(highest, parseInt(suffix));
+            }
+        }
+    }
+    return highest === 0 ? defaultName : `${defaultName} ${highest + 1}`;
+}