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util.human.io: Add term_width() method to discover the terminal width

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This is not standard POSIX, but apparently very widely supported. For
reference: https://www.austingroupbugs.net/view.php?id=1053
This commit is contained in:
Matthew Wild 2023-04-07 12:33:17 +01:00
parent f937942519
commit 403acbb836
1 changed files with 12 additions and 0 deletions
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12
util/human/io.lua
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@ -108,6 +108,17 @@ if utf8.len and utf8.offset then
end
end
local function term_width(default)
local stty = io.popen("stty -a");
if not stty then return default; end
local result = stty:read("*a");
if result then
result = result:match("%f[%w]columns[ =]*(%d+)");
end
stty:close();
return tonumber(result or default);
end
local function ellipsis(s, width)
if len(s) <= width then return s; end
if width == 1 then return "…"; end
@ -194,6 +205,7 @@ return {
printf = printf;
padleft = padleft;
padright = padright;
term_width = term_width;
ellipsis = ellipsis;
table = new_table;
};