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--!A cross-platform build utility based on Lua
--
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
--
-- http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
--
-- Copyright (C) 2015-2020, TBOOX Open Source Group.
--
-- @author ruki
-- @file tty.lua
--
-- define module
local tty = tty or {}
-- load modules
local io = require("base/io")
-- @see http://www.termsys.demon.co.uk/vtansi.htm
-- write control characters
function tty._iowrite(...)
local isatty = tty._ISATTY
if isatty == nil then
isatty = io.isatty()
tty._ISATTY = isatty
end
if isatty then
io.write(...)
end
end
-- erases from the current cursor position to the end of the current line.
function tty.erase_line_to_end()
tty._iowrite("\x1b[K")
return tty
end
-- erases from the current cursor position to the start of the current line.
function tty.erase_line_to_start()
tty._iowrite("\x1b[1K")
return tty
end
-- erases the entire current line
function tty.erase_line()
tty._iowrite("\x1b[2K")
return tty
end
-- erases the screen from the current line down to the bottom of the screen.
function tty.erase_down()
tty._iowrite("\x1b[J")
return tty
end
-- erases the screen from the current line up to the top of the screen.
function tty.erase_up()
tty._iowrite("\x1b[1J")
return tty
end
-- erases the screen with the background colour and moves the cursor to home.
function tty.erase_screen()
tty._iowrite("\x1b[2J")
return tty
end
-- save current cursor position.
function tty.cursor_save()
tty._iowrite("\x1b[s")
return tty
end
-- restores cursor position after a save cursor.
function tty.cursor_restore()
tty._iowrite("\x1b[u")
return tty
end
-- save current cursor position and color attrs
function tty.cursor_and_attrs_save()
tty._iowrite("\x1b7")
return tty
end
-- restores cursor position and color attrs after a save cursor.
function tty.cursor_and_attrs_restore()
tty._iowrite("\x1b8")
return tty
end
-- carriage return
function tty.cr()
tty._iowrite("\r")
return tty
end
-- flush control
function tty.flush()
if io.isatty() then
io.flush()
end
return tty
end
-- return module
return tty
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