From 44b19ed36c9e83e1916c19ad149552b36468699f Mon Sep 17 00:00:00 2001
From: andrewlalis <me@andrewlalis.com>
Date: Sun, 15 Mar 2026 08:33:11 -0400
Subject: [PATCH] CSV escape processing.

---
 finnow-api/source/util/csv.d | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/finnow-api/source/util/csv.d b/finnow-api/source/util/csv.d
index 2458e52..385d613 100644
--- a/finnow-api/source/util/csv.d
+++ b/finnow-api/source/util/csv.d
@@ -27,7 +27,14 @@ struct CsvStreamWriter(S) if (isByteOutputStream!S) {
             result = stream.writeToStream([',']);
             throwIfError(result);
         }
+        import std.regex : replaceAll, regex;
+        import std.string : indexOf;
         string s = value.to!string();
+        bool shouldValueBeQuoted = indexOf(s, '"') != -1 || indexOf(s, ',') != -1;
+        s = replaceAll(value.to!string(), regex("\""), "\"\"");
+        if (shouldValueBeQuoted) {
+            s = "\"" ~ s ~ "\"";
+        }
         result = stream.writeToStream(cast(ubyte[]) s);
         throwIfError(result);
         atStartOfRow = false;