From 77e9a22aff13a12cb17d67dbd1bc47aa5d5072f4 Mon Sep 17 00:00:00 2001
From: Ilya Sovtsov <70143303+bo1led-owl@users.noreply.github.com>
Date: Wed, 7 Jun 2023 12:51:29 +0400
Subject: [PATCH] Add check for a non-zero value for tab width (#7178)

---
 helix-core/src/syntax.rs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/helix-core/src/syntax.rs b/helix-core/src/syntax.rs
index c2dd33106..2a5bb974d 100644
--- a/helix-core/src/syntax.rs
+++ b/helix-core/src/syntax.rs
@@ -48,6 +48,21 @@ where
         .transpose()
 }
 
+fn deserialize_tab_width<'de, D>(deserializer: D) -> Result<usize, D::Error>
+where
+    D: serde::Deserializer<'de>,
+{
+    usize::deserialize(deserializer).and_then(|n| {
+        if n > 0 && n <= 16 {
+            Ok(n)
+        } else {
+            Err(serde::de::Error::custom(
+                "tab width must be a value from 1 to 16 inclusive",
+            ))
+        }
+    })
+}
+
 pub fn deserialize_auto_pairs<'de, D>(deserializer: D) -> Result<Option<AutoPairs>, D::Error>
 where
     D: serde::Deserializer<'de>,
@@ -424,6 +439,7 @@ pub struct DebuggerQuirks {
 #[derive(Debug, Serialize, Deserialize)]
 #[serde(rename_all = "kebab-case")]
 pub struct IndentationConfiguration {
+    #[serde(deserialize_with = "deserialize_tab_width")]
     pub tab_width: usize,
     pub unit: String,
 }