From 2d9b4992eccedd19cf6d7e4f84338511c3a87e5e Mon Sep 17 00:00:00 2001
From: ToruNiina <niina.toru.68u@gmail.com>
Date: Sun, 21 Apr 2019 16:38:08 +0900
Subject: [PATCH] fix: restrict length of underline by size of line

in some cases, `region` contains several lines and `region::size`
returns the whole size that is a sum of lengthes of all the lines.
To avoid too long underlines, restrict the length of underline by
the length of the line that is shown in the message.
---
 toml/region.hpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/toml/region.hpp b/toml/region.hpp
index 1720a7f..6ef6f9b 100644
--- a/toml/region.hpp
+++ b/toml/region.hpp
@@ -343,7 +343,8 @@ inline std::string format_underline(const std::string& message,
         {
             // invalid
             // ~~~~~~~
-            retval << make_string(reg->size(), '~');
+            const auto underline_len = std::min(reg->size(), reg->line().size());
+            retval << make_string(underline_len, '~');
         }
 
         retval << ' ';