Fix indent config

close #1322

autoload/SpaceVim.vim

@@ -39,6 +39,9 @@ lockvar g:spacevim_version
 " <
 let g:spacevim_default_indent          = 2
 ""
+" In Insert mode: Use the appropriate number of spaces to insert a <Tab>
+let g:spacevim_expand_tab              = 1
+""
 " Enable/Disable relativenumber, by default it is enabled.
 let g:spacevim_relativenumber          = 1
 ""
@@ -652,8 +655,14 @@ function! SpaceVim#end() abort
     set relativenumber
   endif
 
+  " tab options:
+  set smarttab
+  let &expandtab = g:spacevim_expand_tab
+  let &tabstop = g:spacevim_default_indent
+  let &softtabstop = g:spacevim_default_indent
   let &shiftwidth = g:spacevim_default_indent
 
+
   if g:spacevim_realtime_leader_guide
     nnoremap <silent><nowait> <leader> :<c-u>LeaderGuide get(g:, 'mapleader', '\')<CR>
     vnoremap <silent> <leader> :<c-u>LeaderGuideVisual get(g:, 'mapleader', '\')<CR>

autoload/SpaceVim/default.vim

@@ -35,7 +35,6 @@ function! SpaceVim#default#options() abort
   " begining start delete the char you just typed in if you do not use set
   " nocompatible ,you need this
   set backspace=indent,eol,start
-  set smarttab
   set nrformats-=octal
   set listchars=tab:→\ ,eol:↵,trail:·,extends:↷,precedes:↶
   set fillchars=vert:│,fold:·
@@ -56,12 +55,6 @@ function! SpaceVim#default#options() abort
   " do not break words.
   set linebreak
 
-  " tab options:
-  set tabstop=4
-  set expandtab
-  set softtabstop=4
-  set shiftwidth=4
-
   " Enable line number
   set number
 

doc/SpaceVim.txt

@@ -86,6 +86,9 @@ Change the default indentation of SpaceVim. Default is 2.
   let g:spacevim_default_indent = 2
 <
 
+                                                       *g:spacevim_expand_tab*
+In Insert mode: Use the appropriate number of spaces to insert a <Tab>
+
                                                    *g:spacevim_relativenumber*
 Enable/Disable relativenumber, by default it is enabled.