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local helpers = require('test.functional.helpers')(after_each)
local clear = helpers.clear
local command = helpers.command
local eval = helpers.eval
local expect = helpers.expect
local eq = helpers.eq
local feed = helpers.feed
local feed_command = helpers.feed_command
local insert = helpers.insert
local funcs = helpers.funcs
local function lastmessage()
local messages = funcs.split(funcs.execute('messages'), '\n')
return messages[#messages]
end
describe('u CTRL-R g- g+', function()
before_each(clear)
local function create_history(num_steps)
if num_steps == 0 then return end
insert('1')
if num_steps == 1 then return end
feed('o2<esc>')
feed('o3<esc>')
feed('u')
if num_steps == 2 then return end
feed('o4<esc>')
if num_steps == 3 then return end
feed('u')
end
local function undo_and_redo(hist_pos, undo, redo, expect_str)
command('enew!')
create_history(hist_pos)
local cur_contents = helpers.curbuf_contents()
feed(undo)
expect(expect_str)
feed(redo)
expect(cur_contents)
end
-- TODO Look for message saying 'Already at oldest change'
it('does nothing when no changes have happened', function()
undo_and_redo(0, 'u', '<C-r>', '')
undo_and_redo(0, 'g-', 'g+', '')
end)
it('undoes a change when at a leaf', function()
undo_and_redo(1, 'u', '<C-r>', '')
undo_and_redo(1, 'g-', 'g+', '')
end)
it('undoes a change when in a non-leaf', function()
undo_and_redo(2, 'u', '<C-r>', '1')
undo_and_redo(2, 'g-', 'g+', '1')
end)
it('undoes properly around a branch point', function()
undo_and_redo(3, 'u', '<C-r>', [[
1
2]])
undo_and_redo(3, 'g-', 'g+', [[
1
2
3]])
end)
it('can find the previous sequence after undoing to a branch', function()
undo_and_redo(4, 'u', '<C-r>', '1')
undo_and_redo(4, 'g-', 'g+', '1')
end)
end)
describe(':undo! command', function()
before_each(function()
clear()
feed('i1 little bug in the code<Esc>')
feed('o1 little bug in the code<Esc>')
feed('oTake 1 down, patch it around<Esc>')
feed('o99 little bugs in the code<Esc>')
end)
it('works', function()
feed_command('undo!')
expect([[
1 little bug in the code
1 little bug in the code
Take 1 down, patch it around]])
feed('<C-r>')
eq('Already at newest change', lastmessage())
end)
it('works with arguments', function()
feed_command('undo! 2')
expect([[
1 little bug in the code
1 little bug in the code]])
feed('<C-r>')
eq('Already at newest change', lastmessage())
end)
it('correctly sets alternative redo', function()
feed('uo101 little bugs in the code<Esc>')
feed_command('undo!')
feed('<C-r>')
expect([[
1 little bug in the code
1 little bug in the code
Take 1 down, patch it around
99 little bugs in the code]])
feed('uuoTake 2 down, patch them around<Esc>')
feed('o101 little bugs in the code<Esc>')
feed_command('undo! 2')
feed('<C-r><C-r>')
expect([[
1 little bug in the code
1 little bug in the code
Take 1 down, patch it around
99 little bugs in the code]])
end)
it('fails when attempting to redo or move to different undo branch', function()
feed_command('undo! 4')
eq('E5767: Cannot use :undo! to redo or move to a different undo branch', eval('v:errmsg'))
feed('u')
feed_command('undo! 4')
eq('E5767: Cannot use :undo! to redo or move to a different undo branch', eval('v:errmsg'))
feed('o101 little bugs in the code<Esc>')
feed('o101 little bugs in the code<Esc>')
feed_command('undo! 4')
eq('E5767: Cannot use :undo! to redo or move to a different undo branch', eval('v:errmsg'))
end)
end)
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