From b9837e2d99bddff368c4b5e2721479093c1f8858 Mon Sep 17 00:00:00 2001
From: Kim Alvefur <zash@zash.se>
Date: Fri, 12 Nov 2021 12:19:01 +0100
Subject: util.human.io: Trim any broken UTF-8 from ellipsis

This should fix basic problems with multi-byte UTF-8 sequences getting
cut in the middle.

Down the rabbit hole we go...
---
 util/human/io.lua | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'util/human/io.lua')

diff --git a/util/human/io.lua b/util/human/io.lua
index 2e59ea85..09ed2807 100644
--- a/util/human/io.lua
+++ b/util/human/io.lua
@@ -1,4 +1,5 @@
 local array = require "util.array";
+local utf8 = rawget(_G,"utf8") or require"util.encodings".utf8;
 
 local function getchar(n)
 	local stty_ret = os.execute("stty raw -echo 2>/dev/null");
@@ -96,7 +97,10 @@ local function padleft(s, width)
 end
 
 local function ellipsis(s, width)
-	return s:sub(1, width-1) .. "…";
+	if #s <= width then return s; end
+	s = s:sub(1, width - 1)
+	while not utf8.len(s) do s = s:sub(1, -2); end
+	return s .. "…";
 end
 
 local function new_table(col_specs, max_width)
-- 
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