first class integration with tagbar

autoload/airline.vim

@@ -71,9 +71,9 @@ endfunction
 
 function! airline#update_externals()
   let g:airline_externals_bufferline = g:airline_enable_bufferline && exists('*bufferline#get_status_string')
-        \ ? '%{bufferline#refresh_status()}'.bufferline#get_status_string()
-        \ : "%f%m"
-  let g:airline_externals_syntastic = g:airline_enable_syntastic && exists('*SyntasticStatuslineFlag') ? '%{SyntasticStatuslineFlag()}' : ''
+        \ ? '%{bufferline#refresh_status()}'.bufferline#get_status_string() : "%f%m"
+  let g:airline_externals_syntastic = g:airline_enable_syntastic && exists('*SyntasticStatuslineFlag')
+        \ ? '%{SyntasticStatuslineFlag()}' : ''
   let g:airline_externals_branch = g:airline_enable_branch
         \ ? (exists('*fugitive#head') && strlen(fugitive#head()) > 0
           \ ? g:airline_branch_prefix.fugitive#head()
@@ -81,6 +81,8 @@ function! airline#update_externals()
             \ ? g:airline_branch_prefix.lawrencium#statusline()
             \ : '')
         \ : ''
+  let g:airline_externals_tagbar = g:airline_enable_tagbar && exists(':Tagbar')
+        \ ? '%(%{tagbar#currenttag("%s","")} '.g:airline_right_alt_sep.'%)' : ''
 endfunction
 
 function! s:getwinvar(winnr, key, ...)
@@ -120,7 +122,8 @@ function! s:get_statusline(winnr, active)
     let sl.=l:status_color.' %f%m'
   endif
   if !s:getwinvar(a:winnr, 'airline_left_only', 0)
-    let sl.='%= '.s:get_section(a:winnr, 'x').' '
+    let sl.='%='.g:airline_externals_tagbar
+    let sl.=' '.s:get_section(a:winnr, 'x').' '
     let sl.=l:info_sep_color
     let sl.=a:active ? g:airline_right_sep : g:airline_right_alt_sep
     let sl.=l:info_color

doc/airline.txt

@@ -6,24 +6,23 @@ INTRODUCTION                                                       *airline*
 There's already powerline <https://github.com/Lokaltog/powerline>, why yet
 another statusline?
 
-*  it's 100% vimscript; no python needed.
-*  it's small.  i want the core plugin to be less than 200 lines as a rule.
-*  it gets you 90% of the way there; in addition to all the standard goodies,
-   it integrates with a variety of popular plugins, including:
+*  100% vimscript; no python needed.
+*  small.  i want the core plugin to be less than 200 lines as a rule.
+*  integrates with a variety of popular plugins, including:
   *  fugitve <https://github.com/tpope/vim-fugitive>
   *  syntastic <https://github.com/scrooloose/syntastic>
   *  vim-bufferline <https://github.com/bling/vim-bufferline>
   *  unite <https://github.com/Shougo/unite.vim>
   *  ctrlp <https://github.com/kien/ctrlp.vim>
   *  lawrencium <https://bitbucket.org/ludovicchabant/vim-lawrencium>
-*  it looks good with regular fonts, and provides configuration points so you
+*  looks good with regular fonts, and provides configuration points so you
    can use unicode or powerline symbols.
-*  it's fast to load, taking roughly 1ms.  by comparison, powerline needs
-   60ms on the same machine.
-*  it's fully customizable; if you know a little |statusline| syntax you can
+*  fast to load, taking roughly 1ms.  by comparison, powerline needs 60ms
+   on the same machine.
+*  fully customizable; if you know a little |statusline| syntax you can
    tweak it to your needs.
-*  it's trivial to write colorschemes; for a minimal theme you need to edit
-   9 lines of colors. (please send pull requests if you create new themes!)
+*  trivial to write colorschemes; for a minimal theme you need to edit
+   9 lines of colors. (please send pull requests)
 
 ==============================================================================
 NAME                                                          *airline-name*
@@ -59,6 +58,11 @@ values):
   let g:airline_enable_syntastic=1
 <
 
+* enable/disable tagbar integration
+>
+  let g:airline_enable_tagbar=1
+<
+
 * enable modified detection
 >
   let g:airline_detect_modified=1

plugin/airline.vim

@@ -18,6 +18,7 @@ call s:check_defined('g:airline_right_alt_sep', exists('g:airline_powerline_font
 call s:check_defined('g:airline_enable_bufferline', 1)
 call s:check_defined('g:airline_enable_branch', 1)
 call s:check_defined('g:airline_enable_syntastic', 1)
+call s:check_defined('g:airline_enable_tagbar', 1)
 call s:check_defined('g:airline_detect_iminsert', 0)
 call s:check_defined('g:airline_detect_modified', 1)
 call s:check_defined('g:airline_detect_paste', 1)