From 35add63ec4dce39710095f17abd86777de9e5b49 Mon Sep 17 00:00:00 2001
From: Elizabeth Hunt <me@liz.coffee>
Date: Sat, 4 Oct 2025 18:36:10 -0700
Subject: Working history state

---
 src/utils/grid.ts | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 src/utils/grid.ts

(limited to 'src/utils/grid.ts')

diff --git a/src/utils/grid.ts b/src/utils/grid.ts
new file mode 100644
index 0000000..71370da
--- /dev/null
+++ b/src/utils/grid.ts
@@ -0,0 +1,50 @@
+import type { AnsiTermColor, Grid } from '@/types/grid';
+import { getAnsiColorEscape, getAnsiEscapeCodeFromDiff } from './ansi';
+
+const defaultColor: AnsiTermColor = { foreground: null, background: null };
+export const gridFromAscii = (
+    ascii: string,
+    color: AnsiTermColor = defaultColor,
+): Grid => {
+    const lineWidth = Math.max(...ascii.split('\n').map((line) => line.length));
+    return ascii.split('\n').map((line, y) =>
+        line
+            .split('')
+            .map((char, x) => ({
+                char,
+                color,
+                x,
+                y,
+            }))
+            .concat(
+                Array(lineWidth - line.length)
+                    .fill(0)
+                    .map((_, x) => ({
+                        char: ' ',
+                        color,
+                        x: x + line.length,
+                        y,
+                    })),
+            ),
+    );
+};
+
+export const gridToAnsi = (grid: Grid) => {
+    const reset: AnsiTermColor = { foreground: null, background: null };
+    const { fg, bg } = getAnsiColorEscape(reset);
+    const resetCode = `${fg}${bg}`;
+
+    const rows = [];
+    for (let y = 0; y < grid.length; y++) {
+        let row = '';
+        for (let x = 0; x < grid[y].length; x++) {
+            const cell = grid[y][x];
+            const previousColor = x > 0 ? grid[y][x - 1].color : reset;
+            row +=
+                getAnsiEscapeCodeFromDiff(previousColor, cell.color) +
+                cell.char;
+        }
+        rows.push(row);
+    }
+    return resetCode + rows.join(resetCode + '\n');
+};
-- 
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