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local M = {}
M.init = function()
-- get tty
local tty_handle = io.popen('tty')
if tty_handle == nil then return end
local tty = tty_handle:read('*a')
tty_handle:close()
if tty:find("not a tty") then error('not a tty') end
M.tty = tty
end
M.update = function()
if M.tty == nil then return end
if not M.normal then
-- get colorscheme Normal highlight
local normal = vim.api.nvim_get_hl(0, { name = 'Normal', create = false })
if (normal.bg == nil) then return end
-- cache old value for use with VimResume
M.normal = normal
end
-- emit CSI to change terminal background to Normal.bg
os.execute('printf "\\033]11;' .. string.format('#%06x', M.normal.bg) .. '\\007" > ' .. M.tty)
-- set colorscheme Normal.bg to NONE, making it transparent
vim.cmd [[hi Normal ctermbg=NONE guibg=NONE]]
end
M.reset = function()
if M.tty == nil then return end
os.execute('printf "\\033]111\\007" > ' .. M.tty)
end
M.setup = function(opts)
opts = opts or {}
M.init()
vim.api.nvim_create_autocmd({ 'ColorScheme', 'UIEnter', 'VimResume' }, { callback = M.update })
vim.api.nvim_create_autocmd({ 'UILeave' }, { callback = M.reset })
end
return M
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