use floating windows for flygrep (#2216)

autoload/SpaceVim/plugins/flygrep.vim

@@ -16,6 +16,8 @@ let s:LIST = SpaceVim#api#import('data#list')
 let s:HI = SpaceVim#api#import('vim#highlight')
 " }}}
 
+let s:grepid = 0
+
 " Init local options: {{{
 let s:grep_expr = ''
 let [
@@ -258,6 +260,7 @@ function! s:close_grep_job() abort
   " NOTE: the jobid maybe -1, that is means the cmd is not executable.
   if s:grepid > 0
     call s:JOB.stop(s:grepid)
+    let s:std_line = 0
   endif
   call timer_stop(s:grep_timer_id)
   call timer_stop(s:preview_timer_id)
@@ -275,6 +278,16 @@ endfunction
 " @vimlint(EVL103, 1, a:data)
 " @vimlint(EVL103, 1, a:id)
 " @vimlint(EVL103, 1, a:event)
+
+" if exists('*nvim_open_win')
+" let s:std_line = 0
+" function! s:grep_stdout(id, data, event) abort
+" let datas =filter(a:data, '!empty(v:val)')
+" call nvim_buf_set_lines(s:buffer_id,s:std_line,-1,v:true,datas)
+" let s:std_line += len(datas)
+" call s:MPT._build_prompt()
+" endfunction
+" else
 function! s:grep_stdout(id, data, event) abort
   let datas =filter(a:data, '!empty(v:val)')
   " let datas = s:LIST.uniq_by_func(datas, function('s:file_line'))
@@ -288,6 +301,7 @@ function! s:grep_stdout(id, data, event) abort
     endif
   endif
 endfunction
+" endif
 
 function! s:grep_stderr(id, data, event) abort
   call SpaceVim#logger#error(' flygerp stderr: ' . string(a:data))
@@ -297,6 +311,7 @@ function! s:grep_exit(id, data, event) abort
   redraw
   call s:MPT._build_prompt()
   redrawstatus
+  let s:std_line = 1
   let s:grepid = 0
 endfunction
 " @vimlint(EVL103, 0, a:data)
@@ -446,6 +461,13 @@ endfunction
 let s:previewd_bufnrs = []
 
 " @vimlint(EVL103, 1, a:timer)
+" use floating windows to preview
+let s:preview_win_id = -1
+if exists('*nvim_open_win')
+  function! s:preview_timer(timer) abort
+
+  endfunction
+else
   function! s:preview_timer(timer) abort
     for id in filter(s:previewd_bufnrs, 'bufexists(v:val) && buflisted(v:val)')
       exe 'silent bd ' . id
@@ -463,6 +485,7 @@ function! s:preview_timer(timer) abort
     resize 18
     call s:MPT._build_prompt()
   endfunction
+endif
 " @vimlint(EVL103, 0, a:timer)
 
 
@@ -573,7 +596,22 @@ function! SpaceVim#plugins#flygrep#open(agrv) abort
   let s:mode = ''
   " set default handle func: s:flygrep
   let s:MPT._handle_fly = function('s:flygrep')
+  if exists('*nvim_open_win')
+    let s:buffer_id = nvim_create_buf(v:false, v:false)
+    let flygrep_win_height = 16
+    let s:flygrep_win_id = nvim_open_win(s:buffer_id, v:true, &columns, flygrep_win_height,
+          \ {
+          \ 'relative': 'editor',
+          \ 'row': &lines - flygrep_win_height - 2,
+          \ 'col': 0
+          \ })
+  else
     noautocmd rightbelow split __flygrep__
+    let s:flygrep_win_id = win_getid()
+  endif
+  if exists('&winhighlight')
+    set winhighlight=Normal:Pmenu,EndOfBuffer:Pmenu,CursorLine:PmenuSel
+  endif
   let s:flygrep_buffer_id = bufnr('%')
   setlocal buftype=nofile bufhidden=wipe nobuflisted nolist noswapfile nowrap cursorline nospell nonu norelativenumber
   let save_tve = &t_ve
@@ -632,6 +670,42 @@ function! SpaceVim#plugins#flygrep#open(agrv) abort
 endfunction
 " }}}
 
+let s:statusline_win_id = -1
+let s:statusline_buf_id = -1
+function! s:create_statusline() abort
+  let s:statusline_buf_id = nvim_create_buf(0,0)
+  let s:statusline_win_id = nvim_open_win(s:statusline_buf_id,
+        \ v:true,
+        \ &columns ,
+        \ 1,
+        \ {
+        \   'relative': 'editor',
+        \   'row': &lines ,
+        \   'col': 10
+        \ })
+  call setbufvar(s:statusline_buf_id, '&relativenumber', 0)
+  call setbufvar(s:statusline_buf_id, '&number', 0)
+  call nvim_buf_set_virtual_text(
+        \ s:statusline_buf_id,
+        \ -1,
+        \ 0,
+        \ [
+        \ ['FlyGrep ', 'SpaceVim_statusline_a_bold'],
+        \ ['', 'SpaceVim_statusline_a_SpaceVim_statusline_b'],
+        \ [SpaceVim#plugins#flygrep#mode(), 'SpaceVim_statusline_b'],
+        \ ['', 'SpaceVim_statusline_b_SpaceVim_statusline_c'],
+        \ [getcwd(), 'SpaceVim_statusline_c'],
+        \ ['', 'SpaceVim_statusline_c_SpaceVim_statusline_b'],
+        \ [SpaceVim#plugins#flygrep#lineNr(), 'SpaceVim_statusline_b'],
+        \ ['', 'SpaceVim_statusline_b_SpaceVim_statusline_z'],
+        \ ],
+        \ {})
+endfunction
+
+function! Test_st() abort
+  call s:create_statusline()
+endfunction
+
 " Plugin API: SpaceVim#plugins#flygrep#lineNr() {{{
 function! SpaceVim#plugins#flygrep#lineNr() abort
   if getline(1) ==# ''