Add toggle whitespace mappings SPC t w

autoload/SpaceVim/api/vim/statusline.vim

@@ -5,7 +5,7 @@ function! s:self.build(left_sections, right_sections, lsep, rsep, hi_a, hi_b, hi
     let l = '%#' . a:hi_a . '#' . a:left_sections[0]
     let l .= '%#' . a:hi_a . '_' . a:hi_b . '#' . a:lsep
     let flag = 1
-    for sec in a:left_sections[1:]
+    for sec in filter(a:left_sections[1:], '!empty(v:val)')
         if flag == 1
             let l .= '%#' . a:hi_b . '#' . sec
             let l .= '%#' . a:hi_b . '_' . a:hi_c . '#' . a:lsep
@@ -30,7 +30,7 @@ function! s:self.build(left_sections, right_sections, lsep, rsep, hi_a, hi_b, hi
     endif
     let l .= '%#' . a:hi_b . '_' . a:hi_z . '#' . a:rsep
     let flag = 1
-    for sec in a:right_sections
+    for sec in filter(a:right_sections, '!empty(v:val)')
         if flag == 1
             let l .= '%#' . a:hi_b . '#' . sec
             let l .= '%#' . a:hi_c . '_' . a:hi_b . '#' . a:rsep

autoload/SpaceVim/layers/core/statusline.vim

@@ -47,6 +47,10 @@ let s:modes = {
             \ 'icon' : s:MESSLETTERS.circled_letter('S'),
             \ 'desc' : 'spell-checking mode',
             \ },
+            \ 'whitespace' :{
+            \ 'icon' : s:MESSLETTERS.circled_letter('w'),
+            \ 'desc' : 'whitespace mode',
+            \ },
             \ }
 
 let s:loaded_sections = ['syntax checking', 'major mode', 'minor mode lighters', 'version control info']
@@ -109,13 +113,22 @@ function! s:git_branch() abort
     return ''
 endfunction
 
+function! s:whitespace() abort
+    let ln = search('\s\+$', 'n')
+    if ln != 0
+        return ' trailing[' . ln . '] '
+    else
+        return ''
+    endif
+endfunction
+
 
 function! s:modes() abort
     let m = ' ❖ '
     for mode in s:loaded_modes
         let m .= s:modes[mode].icon . ' '
     endfor
-    return m
+    return m . ' '
 endfunction
 
 function! s:filesize() abort
@@ -179,6 +192,9 @@ function! s:active() abort
         call add(rsec, s:time())
     endif
 
+    if index(s:loaded_sections, 'whitespace') != -1
+        call add(rsec, s:whitespace())
+    endif
     return s:STATUSLINE.build(lsec, rsec, s:lsep, s:rsep,
                 \ 'SpaceVim_statusline_a', 'SpaceVim_statusline_b', 'SpaceVim_statusline_c', 'SpaceVim_statusline_z')
 endfunction

autoload/SpaceVim/layers/ui.vim

@@ -70,6 +70,9 @@ function! SpaceVim#layers#ui#config() abort
     call SpaceVim#mapping#space#def('nnoremap', ['t', 'S'], 'call call('
                 \ . string(s:_function('s:toggle_spell_check')) . ', [])',
                 \ 'toggle syntax checker', 1)
+    call SpaceVim#mapping#space#def('nnoremap', ['t', 'w'], 'call call('
+                \ . string(s:_function('s:toggle_whitespace')) . ', [])',
+                \ 'toggle the whitespace', 1)
 endfunction
 " function() wrapper
 if v:version > 703 || v:version == 703 && has('patch1170')
@@ -201,3 +204,8 @@ function! s:toggle_spell_check() abort
     endif
     call SpaceVim#layers#core#statusline#toggle_mode('spell-checking')
 endfunction
+
+function! s:toggle_whitespace() abort
+    call SpaceVim#layers#core#statusline#toggle_section('whitespace')
+    call SpaceVim#layers#core#statusline#toggle_mode('whitespace')
+endfunction