From 17f1026c46e6e3797caf3c69737f66bd612c58e1 Mon Sep 17 00:00:00 2001
From: Igor Aleksanov <popzxc@yandex.ru>
Date: Sat, 3 Oct 2020 16:45:16 +0300
Subject: Improve string helpers functions

---
 crates/stdx/src/lib.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'crates/stdx/src/lib.rs')

diff --git a/crates/stdx/src/lib.rs b/crates/stdx/src/lib.rs
index 011935cad..522a9c1ab 100644
--- a/crates/stdx/src/lib.rs
+++ b/crates/stdx/src/lib.rs
@@ -32,8 +32,12 @@ pub fn to_lower_snake_case(s: &str) -> String {
     let mut buf = String::with_capacity(s.len());
     let mut prev = false;
     for c in s.chars() {
+        // `&& prev` is required to not insert `_` before the first symbol.
         if c.is_ascii_uppercase() && prev {
-            buf.push('_')
+            // This check is required to not translate `Weird_Case` into `weird__case`.
+            if buf.chars().last() != Some('_') {
+                buf.push('_')
+            }
         }
         prev = true;
 
-- 
cgit v1.2.3