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local sys = require("system")
sys.autotermrestore() -- set up auto restore of terminal settings on exit
-- setup Windows console to handle ANSI processing
sys.setconsoleflags(io.stdout, sys.getconsoleflags(io.stdout) + sys.COF_VIRTUAL_TERMINAL_PROCESSING)
sys.setconsoleflags(io.stdin, sys.getconsoleflags(io.stdin) + sys.CIF_VIRTUAL_TERMINAL_INPUT)
-- setup Posix to disable canonical mode and echo
local of_attr = sys.tcgetattr(io.stdin)
sys.setnonblock(io.stdin, true)
sys.tcsetattr(io.stdin, sys.TCSANOW, {
lflag = of_attr.lflag - sys.L_ICANON - sys.L_ECHO, -- disable canonical mode and echo
})
-- generate string to move cursor horizontally
-- positive goes right, negative goes left
local function cursor_move_horiz(n)
if n == 0 then
return ""
end
return "\27[" .. (n > 0 and n or -n) .. (n > 0 and "C" or "D")
end
local rows, cols
print("Change the terminal window size, press any key to exit")
while not sys.readansi(0.2) do -- use readansi to not leave stray bytes in the input buffer
local nrows, ncols = sys.termsize()
if rows ~= nrows or cols ~= ncols then
rows, cols = nrows, ncols
local text = "Terminal size: " .. rows .. "x" .. cols .. " "
io.write(text .. cursor_move_horiz(-#text))
io.flush()
end
end
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