Fix key binding g r (#3728)

autoload/SpaceVim/api/vim/tab.vim

@@ -34,16 +34,21 @@ function! s:self.realTabBuffers(id) abort
   return filter(copy(tabpagebuflist(a:id)), 'buflisted(v:val) && getbufvar(v:val, "&buftype") ==# ""')
 endfunction
 
-function! s:self.previous_tabpagenr() abort
+function! s:tab_closed_handle() abort
-  let tabsinfo = self.__cmp.execute('tabs')
+  if expand('<afile>') <= get(s:, 'previous_tabpagenr', 0)
-  let number = 0
+    let s:previous_tabpagenr -= 1
-  for line in split(tabsinfo, "\n")
-    if line =~# '^Tab page \d'
-      let number = str2nr(matchstr(line, '\d\+'))
-    elseif line =~# '^#'
-      return number
   endif
-  endfor
+endfunction
+
+" as vim do not support tabpagenr('#')
+augroup spacevim_api_vim_tab
+  autocmd!
+  autocmd TabLeave * let s:previous_tabpagenr = tabpagenr()
+  autocmd TabClosed * call <SID>tab_closed_handle()
+augroup END
+
+function! s:self.previous_tabpagenr() abort
+  return get(s:, 'previous_tabpagenr', 0)
 endfunction
 
 function! SpaceVim#api#vim#tab#get() abort

autoload/SpaceVim/default.vim

@@ -9,6 +9,7 @@
 scriptencoding utf-8
 
 let s:SYSTEM = SpaceVim#api#import('system')
+let s:TAB = SpaceVim#api#import('vim#tab')
 
 " Default options {{{
 function! SpaceVim#default#options() abort
@@ -264,7 +265,7 @@ function! SpaceVim#default#keyBindings() abort
   " Tabs
   nnoremap <silent> g0 :<C-u>tabfirst<CR>
   nnoremap <silent> g$ :<C-u>tablast<CR>
-  nnoremap <silent><expr> gr tabpagenr('#') > 0 ? ':exe "tabnext " . tabpagenr("#")<cr>' : ''
+  nnoremap <silent> gr :<C-u>call <SID>switch_tabs()<CR>
 
   " Remove spaces at the end of lines
   nnoremap <silent> ,<Space> :<C-u>silent! keeppatterns %substitute/\s\+$//e<CR>
@@ -351,4 +352,11 @@ function! SpaceVim#default#Customfoldtext() abort
   return prefix . line . expansionString . foldSizeStr . foldPercentage . foldLevelStr
 endfunction
 
+function! s:switch_tabs() abort
+  let previous_tab = s:TAB.previous_tabpagenr()
+  if previous_tab > 0
+    exe "tabnext " . previous_tab
+  endif
+endfunction
+
 " vim:set et sw=2:

docs/cn/documentation.md

@@ -630,7 +630,7 @@ endfunction
 如果只有一个 Tab, Buffers 将被罗列在标签栏上，每一个包含：序号、文件类型图标、文件名。如果有不止一个 Tab, 那么所有 Tab 将被罗列在标签栏上。标签栏上每一个 Tab 或者 Buffer 可通过快捷键 `<Leader> number` 进行快速访问，默认的 `<Leader>` 是 `\`。
 
 | 快捷键       | 功能描述                                |
-| ------------ | ------------------ |
+| ------------ | --------------------------------------- |
 | `<Leader> 1` | 跳至标签栏序号 1                        |
 | `<Leader> 2` | 跳至标签栏序号 2                        |
 | `<Leader> 3` | 跳至标签栏序号 3                        |
@@ -640,10 +640,15 @@ endfunction
 | `<Leader> 7` | 跳至标签栏序号 7                        |
 | `<Leader> 8` | 跳至标签栏序号 8                        |
 | `<Leader> 9` | 跳至标签栏序号 9                        |
-| `g r`        | 跳至前一个标签序号 |
+| `g r`        | 跳至前一个 Tab，常用于两个 Tab 来回切换 |
+
+**注意:** 两个缓冲区来回切换的快捷键是 `SPC Tab`，
+可阅读[缓冲区管理](#缓冲区管理)部分内容，了解更多缓冲区相关的快捷键。
 
 标签栏上也支持鼠标操作，左键可以快速切换至该标签，中键删除该标签。该特性只支持 Neovim，并且需要 `has('tablineat')` 特性。
 
+**注意:** 这一特性仅限于Neovim并且 `has('tablineat')` 返回 `true`。
+
 | 快捷键           | 功能描述     |
 | ---------------- | ------------ |
 | `<Mouse-left>`   | 切换至该标签 |

docs/documentation.md

@@ -653,7 +653,7 @@ tabs will be listed on the tabline. Each item can be quickly accessed by using
 `<Leader> number`. Default `<Leader>` is `\`.
 
 | Key Bindings | Descriptions                                    |
-| ------------ | -------------------------- |
+| ------------ | ----------------------------------------------- |
 | `<Leader> 1` | Jump to index 1 on tabline                      |
 | `<Leader> 2` | Jump to index 2 on tabline                      |
 | `<Leader> 3` | Jump to index 3 on tabline                      |
@@ -663,7 +663,10 @@ tabs will be listed on the tabline. Each item can be quickly accessed by using
 | `<Leader> 7` | Jump to index 7 on tabline                      |
 | `<Leader> 8` | Jump to index 8 on tabline                      |
 | `<Leader> 9` | Jump to index 9 on tabline                      |
-| `g r`        | Go to previous tab         |
+| `g r`        | Switch to alternate tab (switch back and forth) |
+
+**Note:** `SPC Tab` is the key binding for switching to alternate buffer.
+Read [Buffers and Files](#buffers-and-files) section for more info.
 
 SpaceVim tabline also supports mouse click, left mouse button will switch to buffer,
 while middle button will delete the buffer.