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-- this plugin registers two autocmds that trigger when openeing and closing vim, setting the
-- background of the terminal to the color used by our colorscheme using CSI control codes.
local state = {}
-- 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
state.tty = tty
-- register update hook
vim.api.nvim_create_autocmd({ 'ColorScheme', 'UIEnter', 'VimResume' }, {
callback = function()
if state.tty == nil then
return
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
-- 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,
})
-- register reset hook
vim.api.nvim_create_autocmd({ 'UILeave' }, {
callback = function()
if state.tty == nil then
return
end
os.execute('printf "\\033]111\\007" > ' .. state.tty)
end,
})
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