Add vista.vim (https://github.com/liuchengxu/vista.vim) integration

autoload/airline/extensions.vim

@@ -213,6 +213,11 @@ function! airline#extensions#load()
     call add(s:loaded_ext, 'tagbar')
   endif
 
+  if get(g:, 'airline#extensions#vista#enabled', 1)
+    call airline#extensions#vista#init(s:ext)
+    call add(s:loaded_ext, 'vista')
+  endif
+
   if get(g:, 'airline#extensions#bookmark#enabled', 1)
         \ && exists(':BookmarkToggle')
     call airline#extensions#bookmark#init(s:ext)

autoload/airline/extensions/vista.vim

@@ -0,0 +1,14 @@
+" MIT License. Copyright (c) 2019 s1341 (github@shmarya.net)
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+function! airline#extensions#vista#currenttag()
+  if get(w:, 'airline_active', 0)
+    return get(b:, 'vista_nearest_method_or_function', '')
+  endif
+endfunction
+
+function! airline#extensions#vista#init(ext)
+  call airline#parts#define_function('vista', 'airline#extensions#vista#currenttag')
+endfunction

autoload/airline/init.vim

@@ -166,7 +166,7 @@ function! airline#init#bootstrap()
         \ 'ycm_error_count', 'ycm_warning_count', 'neomake_error_count',
         \ 'neomake_warning_count', 'ale_error_count', 'ale_warning_count',
         \ 'languageclient_error_count', 'languageclient_warning_count',
-        \ 'coc_warning_count', 'coc_error_count'])
+        \ 'coc_warning_count', 'coc_error_count', 'vista'])
   call airline#parts#define_text('bookmark', '')
   call airline#parts#define_text('capslock', '')
   call airline#parts#define_text('gutentags', '')
@@ -200,7 +200,7 @@ function! airline#init#sections()
     let g:airline_section_gutter = airline#section#create(['%='])
   endif
   if !exists('g:airline_section_x')
-    let g:airline_section_x = airline#section#create_right(['bookmark', 'tagbar', 'gutentags', 'grepper', 'filetype'])
+    let g:airline_section_x = airline#section#create_right(['bookmark', 'tagbar', 'vista', 'gutentags', 'grepper', 'filetype'])
   endif
   if !exists('g:airline_section_y')
     let g:airline_section_y = airline#section#create_right(['ffenc'])

doc/airline.txt

@@ -1167,6 +1167,12 @@ virtualenv <https://github.com/jmcantrell/vim-virtualenv>
 * enable/disable virtualenv integration >
   let g:airline#extensions#virtualenv#enabled = 1
 <
+-------------------------------------                   *airline-vista*
+vista.vim <https://github.com/liuchngxu/vista.vim>
+
+* enable/disable vista integration >
+  let g:airline#extensions#vista#enabled = 1
+
 -------------------------------------                   *airline-whitespace*
 * enable/disable detection of whitespace errors. >
   let g:airline#extensions#whitespace#enabled = 1