src/testdir/test_scroll_opt.vim

" Test for reset 'scroll' and 'smoothscroll'

source check.vim
source screendump.vim

func Test_reset_scroll()
  let scr = &l:scroll

  setlocal scroll=1
  setlocal scroll&
  call assert_equal(scr, &l:scroll)

  setlocal scroll=1
  setlocal scroll=0
  call assert_equal(scr, &l:scroll)

  try
    execute 'setlocal scroll=' . (winheight(0) + 1)
    " not reached
    call assert_false(1)
  catch
    call assert_exception('E49:')
  endtry

  split

  let scr = &l:scroll

  setlocal scroll=1
  setlocal scroll&
  call assert_equal(scr, &l:scroll)

  setlocal scroll=1
  setlocal scroll=0
  call assert_equal(scr, &l:scroll)

  quit!
endfunc

func Test_CtrlE_CtrlY_stop_at_end()
  enew
  call setline(1, ['one', 'two'])
  set number
  exe "normal \<C-Y>"
  call assert_equal(["  1 one   "], ScreenLines(1, 10))
  exe "normal \<C-E>\<C-E>\<C-E>"
  call assert_equal(["  2 two   "], ScreenLines(1, 10))

  bwipe!
  set nonumber
endfunc

func Test_smoothscroll_CtrlE_CtrlY()
  CheckScreendump

  let lines =<< trim END
      vim9script
      setline(1, [
        'line one',
        'word '->repeat(20),
        'line three',
        'long word '->repeat(7),
        'line',
        'line',
        'line',
      ])
      set smoothscroll
      :5
  END
  call writefile(lines, 'XSmoothScroll', 'D')
  let buf = RunVimInTerminal('-S XSmoothScroll', #{rows: 12, cols: 40})

  call term_sendkeys(buf, "\<C-E>")
  call VerifyScreenDump(buf, 'Test_smoothscroll_1', {})
  call term_sendkeys(buf, "\<C-E>")
  call VerifyScreenDump(buf, 'Test_smoothscroll_2', {})
  call term_sendkeys(buf, "\<C-E>")
  call VerifyScreenDump(buf, 'Test_smoothscroll_3', {})
  call term_sendkeys(buf, "\<C-E>")
  call VerifyScreenDump(buf, 'Test_smoothscroll_4', {})

  call term_sendkeys(buf, "\<C-Y>")
  call VerifyScreenDump(buf, 'Test_smoothscroll_5', {})
  call term_sendkeys(buf, "\<C-Y>")
  call VerifyScreenDump(buf, 'Test_smoothscroll_6', {})
  call term_sendkeys(buf, "\<C-Y>")
  call VerifyScreenDump(buf, 'Test_smoothscroll_7', {})
  call term_sendkeys(buf, "\<C-Y>")
  call VerifyScreenDump(buf, 'Test_smoothscroll_8', {})

  if has('folding')
    call term_sendkeys(buf, ":set foldmethod=indent\<CR>")
    " move the cursor so we can reuse the same dumps
    call term_sendkeys(buf, "5G")
    call term_sendkeys(buf, "\<C-E>")
    call VerifyScreenDump(buf, 'Test_smoothscroll_1', {})
    call term_sendkeys(buf, "\<C-E>")
    call VerifyScreenDump(buf, 'Test_smoothscroll_2', {})
    call term_sendkeys(buf, "7G")
    call term_sendkeys(buf, "\<C-Y>")
    call VerifyScreenDump(buf, 'Test_smoothscroll_7', {})
    call term_sendkeys(buf, "\<C-Y>")
    call VerifyScreenDump(buf, 'Test_smoothscroll_8', {})
  endif

  call StopVimInTerminal(buf)
endfunc

func Test_smoothscroll_number()
  CheckScreendump

  let lines =<< trim END
      vim9script
      setline(1, [
        'one ' .. 'word '->repeat(20),
        'two ' .. 'long word '->repeat(7),
        'line',
        'line',
        'line',
      ])
      set smoothscroll
      set number cpo+=n
      :3

      def g:DoRel()
        set number relativenumber scrolloff=0
        :%del
        setline(1, [
          'one',
          'very long text '->repeat(12),
          'three',
        ])
        exe "normal 2Gzt\<C-E>"
      enddef
  END
  call writefile(lines, 'XSmoothNumber', 'D')
  let buf = RunVimInTerminal('-S XSmoothNumber', #{rows: 12, cols: 40})

  call VerifyScreenDump(buf, 'Test_smooth_number_1', {})
  call term_sendkeys(buf, "\<C-E>")
  call VerifyScreenDump(buf, 'Test_smooth_number_2', {})
  call term_sendkeys(buf, "\<C-E>")
  call VerifyScreenDump(buf, 'Test_smooth_number_3', {})

  call term_sendkeys(buf, ":set cpo-=n\<CR>")
  call VerifyScreenDump(buf, 'Test_smooth_number_4', {})
  call term_sendkeys(buf, "\<C-Y>")
  call VerifyScreenDump(buf, 'Test_smooth_number_5', {})
  call term_sendkeys(buf, "\<C-Y>")
  call VerifyScreenDump(buf, 'Test_smooth_number_6', {})

  call term_sendkeys(buf, ":call DoRel()\<CR>")
  call VerifyScreenDump(buf, 'Test_smooth_number_7', {})

  call StopVimInTerminal(buf)
endfunc

func Test_smoothscroll_diff_mode()
  CheckScreendump

  let lines =<< trim END
      vim9script
      var text = 'just some text here'
      setline(1, text)
      set smoothscroll
      diffthis
      new
      setline(1, text)
      set smoothscroll
      diffthis
  END
  call writefile(lines, 'XSmoothDiff', 'D')
  let buf = RunVimInTerminal('-S XSmoothDiff', #{rows: 8})

  call VerifyScreenDump(buf, 'Test_smooth_diff_1', {})
  call term_sendkeys(buf, "\<C-Y>")
  call VerifyScreenDump(buf, 'Test_smooth_diff_1', {})
  call term_sendkeys(buf, "\<C-E>")
  call VerifyScreenDump(buf, 'Test_smooth_diff_1', {})

  call StopVimInTerminal(buf)
endfunc

func Test_smoothscroll_wrap_scrolloff_zero()
  CheckScreendump

  let lines =<< trim END
      vim9script
      setline(1, ['Line' .. (' with some text'->repeat(7))]->repeat(7))
      set smoothscroll scrolloff=0
      :3
  END
  call writefile(lines, 'XSmoothWrap', 'D')
  let buf = RunVimInTerminal('-S XSmoothWrap', #{rows: 8, cols: 40})

  call VerifyScreenDump(buf, 'Test_smooth_wrap_1', {})

  " moving cursor down - whole bottom line shows
  call term_sendkeys(buf, "j")
  call VerifyScreenDump(buf, 'Test_smooth_wrap_2', {})

  call term_sendkeys(buf, "\<C-E>j")
  call VerifyScreenDump(buf, 'Test_smooth_wrap_3', {})

  call term_sendkeys(buf, "G")
  call VerifyScreenDump(buf, 'Test_smooth_wrap_4', {})

  " moving cursor up - whole top line shows
  call term_sendkeys(buf, "2k")
  call VerifyScreenDump(buf, 'Test_smooth_wrap_5', {})

  call StopVimInTerminal(buf)
endfunc

func Test_smoothscroll_wrap_long_line()
  CheckScreendump

  let lines =<< trim END
      vim9script
      setline(1, ['one', 'two', 'Line' .. (' with lots of text'->repeat(30))])
      set smoothscroll scrolloff=0
      normal 3G10|zt
  END
  call writefile(lines, 'XSmoothWrap', 'D')
  let buf = RunVimInTerminal('-S XSmoothWrap', #{rows: 6, cols: 40})
  call VerifyScreenDump(buf, 'Test_smooth_long_1', {})

  " scrolling up, cursor moves screen line down
  call term_sendkeys(buf, "\<C-E>")
  call VerifyScreenDump(buf, 'Test_smooth_long_2', {})
  call term_sendkeys(buf, "5\<C-E>")
  call VerifyScreenDump(buf, 'Test_smooth_long_3', {})

  " scrolling down, cursor moves screen line up
  call term_sendkeys(buf, "5\<C-Y>")
  call VerifyScreenDump(buf, 'Test_smooth_long_4', {})
  call term_sendkeys(buf, "\<C-Y>")
  call VerifyScreenDump(buf, 'Test_smooth_long_5', {})

  " 'scrolloff' set to 1, scrolling up, cursor moves screen line down
  call term_sendkeys(buf, ":set scrolloff=1\<CR>")
  call term_sendkeys(buf, "10|\<C-E>")
  call VerifyScreenDump(buf, 'Test_smooth_long_6', {})
  
  " 'scrolloff' set to 1, scrolling down, cursor moves screen line up
  call term_sendkeys(buf, "\<C-E>")
  call term_sendkeys(buf, "gjgj")
  call term_sendkeys(buf, "\<C-Y>")
  call VerifyScreenDump(buf, 'Test_smooth_long_7', {})
  
  " 'scrolloff' set to 2, scrolling up, cursor moves screen line down
  call term_sendkeys(buf, ":set scrolloff=2\<CR>")
  call term_sendkeys(buf, "10|\<C-E>")
  call VerifyScreenDump(buf, 'Test_smooth_long_8', {})
  
  " 'scrolloff' set to 2, scrolling down, cursor moves screen line up
  call term_sendkeys(buf, "\<C-E>")
  call term_sendkeys(buf, "gj")
  call term_sendkeys(buf, "\<C-Y>")
  call VerifyScreenDump(buf, 'Test_smooth_long_9', {})
  
  call StopVimInTerminal(buf)
endfunc

func Test_smoothscroll_one_long_line()
  CheckScreendump

  let lines =<< trim END
      vim9script
      setline(1, 'with lots of text '->repeat(7))
      set smoothscroll scrolloff=0
  END
  call writefile(lines, 'XSmoothOneLong', 'D')
  let buf = RunVimInTerminal('-S XSmoothOneLong', #{rows: 6, cols: 40})
  call VerifyScreenDump(buf, 'Test_smooth_one_long_1', {})
  
  call term_sendkeys(buf, "\<C-E>")
  call VerifyScreenDump(buf, 'Test_smooth_one_long_2', {})

  call term_sendkeys(buf, "0")
  call VerifyScreenDump(buf, 'Test_smooth_one_long_1', {})

  call StopVimInTerminal(buf)
endfunc


" vim: shiftwidth=2 sts=2 expandtab