add virtualenv extension

README.md

@@ -7,7 +7,7 @@ Lean & mean statusline for vim that's light as air.
 # Features
 
 *  tiny core written with extensibility in mind ([open/closed principle][8]).
-*  integrates with a variety of plugins, including: [vim-bufferline][6], [fugitive][4], [unite][9], [ctrlp][10], [minibufexpl][15], [gundo][16], [undotree][17], [nerdtree][18], [tagbar][19], [vim-gitgutter][29], [vim-signify][30], [syntastic][5] and [lawrencium][21].
+*  integrates with a variety of plugins, including: [vim-bufferline][6], [fugitive][4], [unite][9], [ctrlp][10], [minibufexpl][15], [gundo][16], [undotree][17], [nerdtree][18], [tagbar][19], [vim-gitgutter][29], [vim-signify][30], [syntastic][5], [lawrencium][21] and [virtualenv][31]
 *  looks good with regular fonts and provides configuration points so you can use unicode or powerline symbols.
 *  optimized for speed; it loads in under a millisecond.
 *  extensive suite of themes for popular colorschemes including [solarized][23] (dark and light), [tomorrow][24] (all variants), [molokai][25], [jellybeans][26] and others; have a look at the [screenshots][14] in the wiki.
@@ -48,6 +48,9 @@ vim-airline provides seamless integration with a variety of plugins.  These exte
 ### hunks ([vim-gitgutter][29] & [vim-signify][30])
 ![image](https://f.cloud.github.com/assets/306502/995185/73fc7054-09b9-11e3-9d45-618406c6ed98.png)
 
+### [virtualenv][31]
+![image](https://f.cloud.github.com/assets/390964/1021386/73ed49e4-0cfc-11e3-96df-8d5084cde7da.png)
+
 # Rationale
 
 There's already [powerline][2], why yet another statusline?
@@ -151,3 +154,4 @@ MIT license. Copyright (c) 2013 Bailey Ling.
 [28]: https://github.com/chrisbra/csv.vim
 [29]: https://github.com/airblade/vim-gitgutter
 [30]: https://github.com/mhinz/vim-signify
+[31]: https://github.com/jmcantrell/vim-virtualenv

autoload/airline/extensions.vim

@@ -161,6 +161,10 @@ function! airline#extensions#load()
     call airline#extensions#bufferline#init(s:ext)
   endif
 
+  if (get(g:, 'virtualenv_loaded', 1) && get(g:, 'airline_enable_virtualenv', 1))
+    call airline#extensions#virtualenv#init(s:ext)
+  endif
+
   if g:airline_section_warning == '__'
     if (get(g:, 'airline#extensions#syntastic#enabled', 1) && get(g:, 'airline_enable_syntastic', 1))
           \ && exists(':SyntasticCheck')

autoload/airline/extensions/virtualenv.vim

@@ -0,0 +1,13 @@
+" MIT License. Copyright (c) 2013 Bailey Ling.
+" vim: et ts=2 sts=2 sw=2
+
+function! airline#extensions#virtualenv#init(ext)
+  call a:ext.add_statusline_func('airline#extensions#virtualenv#apply')
+endfunction
+
+function! airline#extensions#virtualenv#apply(...)
+  if &filetype == "python"
+    let w:airline_section_x = '%{virtualenv#statusline()} '.g:airline_section_x
+  endif
+endfunction
+

doc/airline.txt

@@ -169,7 +169,7 @@ extension.
   let g:airline_section_b       (the fugitive/lawrencium branch indicator)
   let g:airline_section_c       (bufferline or filename)
   let g:airline_section_gutter  (readonly, csv)
-  let g:airline_section_x       (tagbar, filetype)
+  let g:airline_section_x       (tagbar, virtualenv, filetype)
   let g:airline_section_y       (fileencoding, fileformat)
   let g:airline_section_z       (percentage, line number, column number)
   let g:airline_section_warning (syntastic, whitespace)
@@ -253,6 +253,12 @@ ctrlp <https://github.com/kien/ctrlp.vim>
   let g:airline#extensions#ctrlp#color_template = 'visual'
   let g:airline#extensions#ctrlp#color_template = 'replace'
 <
+                                                        *airline-virtualenv*
+
+virtualenv <https://github.com/jmcantrell/vim-virtualenv>
+
+* enable/disable virtualenv integration >
+  let g:airline#extensions#virtualenv#enabled = 1
 
 ==============================================================================
 FUNCREFS                                                  *airline-funcrefs*