Set cells with empty formulas have undefined value

Author: jstrieb

src/classes.svelte.js

@@ -316,7 +316,7 @@ export class Sheet {
         this.heights.length;
         this.widths.length;
 
-        if (cell.formula == null) {
+        if (cell.formula == null || cell.formula == "") {
           cell.value.rederive([], (_, set) => set(undefined));
           return;
         }

test/sheet-and-formula.test.js

@@ -367,3 +367,10 @@ test("Formula functions can access `this`", async () => {
   const state = createSheet([["=BOLD(RC[1] + 1)", "3"]]);
   await expectSheet(state.currentSheet, [[4, 3]]);
 });
+
+test("Cells with empty formula have undefined value", async () => {
+  const state = createSheet([["", "3"]]);
+  await expectSheet(state.currentSheet, [[undefined, 3]]);
+  state.currentSheet.cells[0][1].formula = "";
+  await expectSheet(state.currentSheet, [[undefined, undefined]]);
+});

todo.md

@@ -56,6 +56,7 @@
   - LINK/URL
   - DEBUG?
 - Keyboard shortcuts
+  - Tab stays in insert mode
   - Navigate windows/sheets
     - gt and gT
     - i3 type key commands
@@ -104,4 +105,3 @@
   - The bottom border of sheet tabs do not adjust after renaming
   - If all sheets are deleted, it glitches
   - Clicking a cell in insert mode switches to normal mode
-  - Turn the empty string back into `undefined`