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.
--- 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");