From ea2b48e77fff865e90251b4661f65ccbec80fd3b Mon Sep 17 00:00:00 2001
From: Christopher Monsanto <chris@monsan.to>
Date: Sat, 9 May 2020 07:36:28 -0400
Subject: [PATCH] Allow gaps in sheets

---
 tools/sheet/index.js | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/tools/sheet/index.js b/tools/sheet/index.js
index 8c13f3bd..8ee53ecc 100644
--- a/tools/sheet/index.js
+++ b/tools/sheet/index.js
@@ -13,6 +13,15 @@ if (!sheetjs || !dest) {
 (async() => {
     const {default: sheet} = await import(path.join(process.cwd(), sheetjs));
 
+    for (let i = 0; i < sheet.entries.length; i++) {
+        if (sheet.entries[i] === undefined)
+            throw new Error(`gap: ${i}`);
+        if (sheet.entries[i] === null) {
+            // ImageMagick blank entry
+            sheet.entries[i] = "xc:transparent";
+        }
+    }
+
     cp.execFileSync("montage", [
         ...sheet.entries,
         "-background", "transparent",