From ed7ceebfe07c674933b002beda88391ad5cd6066 Mon Sep 17 00:00:00 2001
From: Seiichi Uchida <seuchida@gmail.com>
Date: Sat, 7 Oct 2017 22:17:01 +0900
Subject: [PATCH] Faster last_line_extendable()

---
 src/utils.rs | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/src/utils.rs b/src/utils.rs
index 649a6070fd2..3106df9ed8b 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -171,12 +171,18 @@ pub fn trimmed_last_line_width(s: &str) -> usize {
 
 #[inline]
 pub fn last_line_extendable(s: &str) -> bool {
-    s.lines().last().map_or(false, |s| {
-        s.ends_with("\"#")
-            || s.trim()
-                .chars()
-                .all(|c| c == ')' || c == ']' || c == '}' || c == '?')
-    })
+    if s.ends_with("\"#") {
+        return true;
+    }
+    for c in s.chars().rev() {
+        match c {
+            ')' | ']' | '}' | '?' => continue,
+            '\n' => break,
+            _ if c.is_whitespace() => continue,
+            _ => return false,
+        }
+    }
+    true
 }
 
 #[inline]
-- 
2.44.0