perf(shell): add center-float position

autoload/SpaceVim/layers/shell.vim

@@ -200,6 +200,20 @@ function! s:open_default_shell(open_with_file_cwd) abort
             \ })
 
     exe win_id2win(s:term_win_id) .  'wincmd w'
+  elseif s:default_position ==# 'center-float' && exists('*nvim_open_win')
+    let s:term_win_id =  nvim_open_win(bufnr('%'), v:true,
+          \ {
+            \ 'relative': 'editor',
+            \ 'width'   : &columns - 10, 
+            \ 'height'  : &lines - 10,
+            \ 'row': 5,
+            \ 'border' : 'single',
+            \ 'col': 5
+            \ })
+
+    exe win_id2win(s:term_win_id) .  'wincmd w'
+
+  call nvim_set_option_value('winhighlight', 'NormalFloat:Normal,FloatBorder:WinSeparator', { 'win' : s:term_win_id})
   else
     " no terminal window found. Open a new window
     let cmd = s:default_position ==# 'float' ?

docs/cn/layers/shell.md

@@ -44,7 +44,7 @@ The default shell is quickly accessible via a the default shortcut key `SPC '`.
 ### 设置终端打开位置及高度
 
 在启用该模块时，可以通过 `default_position` 这一模块选项来指定终端打开的位置，
-目前可以选的值为：`top`, `bottom`, `left`, `right`, `float` or `full`，默认的值为 `top`。
+目前可以选的值为：`top`, `bottom`, `left`, `right`, `float`, `center-float` or `full`，默认的值为 `top`。
 
 同时，可以通过 `default_height` 这一模块选项指定终端打开的高度，默认值为 30。
 

docs/layers/shell.md

@@ -46,7 +46,7 @@ The default shell is quickly accessible via a the default shortcut key `SPC '`.
 ### Default shell position and height
 
 It is possible to choose where the shell should pop up by setting the
-variable `default_position` to either `top`, `bottom`, `left`, `right`, `float`
+variable `default_position` to either `top`, `bottom`, `left`, `right`, `float`, `center-float`
 or `full`. Default value is `top`. It is also possible to set the default height
 in percents with the variable `default_height`. Default value is 30.