# HG changeset patch
# User Kim Alvefur <zash@zash.se>
# Date 1689535297 -7200
# Node ID 8dbe693ded6b898cb63c570ad08ae52aa9ebccb7
# Parent  c8d949cf6b09127031420c0b5f9ec420bd44afd4
util.human.io: Fix stray 'stty' error by only querying width of real ttys

This adds a dependency on a binary and *nix-specific module but then
stty is probably *nix-specific anyway so maybe that's fine.

diff -r c8d949cf6b09 -r 8dbe693ded6b util/human/io.lua
--- a/util/human/io.lua	Sun Jul 16 20:49:33 2023 +0200
+++ b/util/human/io.lua	Sun Jul 16 21:21:37 2023 +0200
@@ -1,4 +1,5 @@
 local array = require "prosody.util.array";
+local pposix = require "prosody.util.pposix";
 local utf8 = rawget(_G, "utf8") or require"prosody.util.encodings".utf8;
 local len = utf8.len or function(s)
 	local _, count = s:gsub("[%z\001-\127\194-\253][\128-\191]*", "");
@@ -111,6 +112,9 @@
 local function term_width(default)
 	local env_cols = tonumber(os.getenv "COLUMNS");
 	if env_cols then return env_cols; end
+	if not pposix.isatty(io.stdout) then
+		return default;
+	end
 	local stty = io.popen("stty -a");
 	if not stty then return default; end
 	local result = stty:read("*a");