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-- this plugin registers two autocmds that trigger when openeing and closing the editor, setting the
-- background of the terminal to the color used by our colorscheme using CSI control codes.
local state = { enabled = false }
if not state.enabled then
return
end
local set_bg = function(clear)
if not (state.tty and state.normal) then
return
end
if clear then
-- emit CSI to unset custom background
os.execute('printf "\\033]111\\007" > ' .. state.tty)
else
-- emit CSI to change terminal background to Normal.bg
os.execute(
'printf "\\033]11;' .. string.format('#%06x', state.normal.bg) .. '\\007" > ' .. state.tty
)
-- set colorscheme Normal.bg to NONE, making it transparent
vim.cmd([[hi Normal ctermbg=NONE guibg=NONE]])
end
end
local discover = function()
if not state.tty then
-- get tty handle
local ok, tty_handle = pcall(io.popen, 'tty')
if (not ok) or tty_handle == nil then
return
end
local tty = tty_handle:read('*l')
tty_handle:close()
if tty:find('not a tty') then
return
end
state.tty = tty
end
if not state.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
state.normal = normal
end
-- vim.notify('syncbg: ' .. vim.inspect(state), vim.log.levels.DEBUG)
end
-- setup autogroup
local aug = vim.api.nvim_create_augroup('syncbg', { clear = true })
-- register update hook
vim.api.nvim_create_autocmd({ 'ColorScheme', 'UIEnter', 'VimResume' }, {
group = aug,
callback = vim.schedule_wrap(function()
discover()
set_bg(false)
end),
})
-- register reset hook
vim.api.nvim_create_autocmd({ 'UILeave' }, {
group = aug,
callback = vim.schedule_wrap(function()
set_bg(true)
end),
})
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