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-- This example shows how to remove platform differences to create a
-- cross-platform level playing field.
local sys = require "system"
if sys.is_windows then
-- Windows holds multiple copies of environment variables, to ensure `getenv`
-- returns what `setenv` sets we need to use the `system.getenv` instead of
-- `os.getenv`.
os.getenv = sys.getenv -- luacheck: ignore
-- Set up the terminal to handle ANSI escape sequences on Windows.
if sys.isatty(io.stdout) then
sys.setconsoleflags(io.stdout, sys.getconsoleflags(io.stdout) + sys.COF_VIRTUAL_TERMINAL_PROCESSING)
end
if sys.isatty(io.stderr) then
sys.setconsoleflags(io.stderr, sys.getconsoleflags(io.stderr) + sys.COF_VIRTUAL_TERMINAL_PROCESSING)
end
if sys.isatty(io.stdin) then
sys.setconsoleflags(io.stdin, sys.getconsoleflags(io.stdout) + sys.ENABLE_VIRTUAL_TERMINAL_INPUT)
end
else
-- On Posix, one can set a variable to an empty string, but on Windows, this
-- will remove the variable from the environment. To make this consistent
-- across platforms, we will remove the variable from the environment if the
-- value is an empty string.
local old_setenv = sys.setenv
function sys.setenv(name, value)
if value == "" then value = nil end
return old_setenv(name, value)
end
end
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