From ca3524b9e36e7bf0d12764bb4d3090da1b1b6cb2 Mon Sep 17 00:00:00 2001
From: Christopher Monsanto <chris@monsan.to>
Date: Wed, 30 Sep 2020 21:30:58 -0400
Subject: [PATCH] sheet: wait for drain on writing entries

---
 tools/sheet/index.ts | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/tools/sheet/index.ts b/tools/sheet/index.ts
index 7ca3caf6..ec53e7dc 100644
--- a/tools/sheet/index.ts
+++ b/tools/sheet/index.ts
@@ -40,7 +40,13 @@ const proc = cp.spawn("magick", [
 
 // Write one at a time to avoid "malloc(): corrupted top size" error
 for (const entry of sheet.entries) {
-    proc.stdin.write(entry + "\n");
+    if (!proc.stdin.write(entry + "\n")) {
+        // imagick doesn't like it when it receives the input too fast. This
+        // seems to avoid a realloc() invalid next size error.
+        await new Promise(resolve => {
+            proc.stdin.once('drain', resolve);
+        });
+    }
 }
 proc.stdin.end();