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local t = require('test.testutil')
local n = require('test.functional.testnvim')()
local Screen = require('test.functional.ui.screen')
local clear = n.clear
local api = n.api
local eq = t.eq
local poke_eventloop = n.poke_eventloop
local assert_alive = n.assert_alive
local CSI = '\027['
describe(':terminal synchronized output (mode 2026)', function()
local screen, chan, buf
before_each(function()
clear()
screen = Screen.new(50, 7)
buf = api.nvim_create_buf(true, true)
chan = api.nvim_open_term(buf, {})
api.nvim_win_set_buf(0, buf)
end)
it('renders content sent inside a synchronized update', function()
api.nvim_chan_send(chan, CSI .. '?2026h')
api.nvim_chan_send(chan, 'synced line 1\r\n')
api.nvim_chan_send(chan, 'synced line 2\r\n')
api.nvim_chan_send(chan, CSI .. '?2026l')
screen:expect([[
^synced line 1 |
synced line 2 |
|*4
|
]])
end)
it('renders all lines from a synchronized update', function()
api.nvim_chan_send(chan, CSI .. '?2026h')
for i = 1, 5 do
api.nvim_chan_send(chan, 'line ' .. i .. '\r\n')
end
api.nvim_chan_send(chan, CSI .. '?2026l')
screen:expect([[
^line 1 |
line 2 |
line 3 |
line 4 |
line 5 |
|
|
]])
-- Buffer lines should also match.
local lines = api.nvim_buf_get_lines(buf, 0, -1, true)
eq('line 1', lines[1])
eq('line 2', lines[2])
eq('line 5', lines[5])
end)
it('handles multiple synchronized update cycles', function()
-- First cycle.
api.nvim_chan_send(chan, CSI .. '?2026h')
api.nvim_chan_send(chan, 'cycle 1\r\n')
api.nvim_chan_send(chan, CSI .. '?2026l')
screen:expect([[
^cycle 1 |
|*5
|
]])
-- Second cycle.
api.nvim_chan_send(chan, CSI .. '?2026h')
api.nvim_chan_send(chan, 'cycle 2\r\n')
api.nvim_chan_send(chan, CSI .. '?2026l')
screen:expect([[
^cycle 1 |
cycle 2 |
|*4
|
]])
end)
it('works with content before and after sync', function()
-- Unsynchronized content.
api.nvim_chan_send(chan, 'before\r\n')
poke_eventloop()
screen:expect([[
^before |
|*5
|
]])
-- Synchronized content.
api.nvim_chan_send(chan, CSI .. '?2026h')
api.nvim_chan_send(chan, 'during\r\n')
api.nvim_chan_send(chan, CSI .. '?2026l')
screen:expect([[
^before |
during |
|*4
|
]])
-- More unsynchronized content.
api.nvim_chan_send(chan, 'after\r\n')
screen:expect([[
^before |
during |
after |
|*3
|
]])
end)
it('does not crash when mode 2026 is set and queried', function()
api.nvim_chan_send(chan, CSI .. '?2026h')
assert_alive()
api.nvim_chan_send(chan, CSI .. '?2026l')
assert_alive()
end)
it('defers screen update during sync mode', function()
-- Establish a known screen state first.
api.nvim_chan_send(chan, 'visible\r\n')
screen:expect([[
^visible |
|*5
|
]])
-- Begin sync and send more content — screen should not change.
api.nvim_chan_send(chan, CSI .. '?2026h')
api.nvim_chan_send(chan, 'deferred\r\n')
screen:expect_unchanged()
-- End sync — now the deferred content should appear.
api.nvim_chan_send(chan, CSI .. '?2026l')
screen:expect([[
^visible |
deferred |
|*4
|
]])
end)
it('handles rapid sync on/off toggling', function()
for i = 1, 5 do
api.nvim_chan_send(chan, CSI .. '?2026h')
api.nvim_chan_send(chan, 'rapid ' .. i .. '\r\n')
api.nvim_chan_send(chan, CSI .. '?2026l')
end
screen:expect([[
^rapid 1 |
rapid 2 |
rapid 3 |
rapid 4 |
rapid 5 |
|
|
]])
end)
end)
|
