integrate changesPlugin for displaying hunks

autoload/airline/extensions.vim

@@ -148,7 +148,7 @@ function! airline#extensions#load()
   endif
 
   if (get(g:, 'airline#extensions#hunks#enabled', 1) && get(g:, 'airline_enable_hunks', 1))
-        \ && (exists('g:loaded_signify') || exists('g:loaded_gitgutter'))
+        \ && (exists('g:loaded_signify') || exists('g:loaded_gitgutter') || exists('g:loaded_changes'))
     call airline#extensions#hunks#init(s:ext)
   endif
 

autoload/airline/extensions/hunks.vim

@@ -1,7 +1,7 @@
 " MIT License. Copyright (c) 2013-2014 Bailey Ling.
 " vim: et ts=2 sts=2 sw=2
 
-if !get(g:, 'loaded_signify', 0) && !get(g:, 'loaded_gitgutter', 0)
+if !get(g:, 'loaded_signify', 0) && !get(g:, 'loaded_gitgutter', 0) && !get(g:, 'loaded_changes', 0)
   finish
 endif
 
@@ -27,6 +27,19 @@ function! s:get_hunks_gitgutter()
   return GitGutterGetHunkSummary()
 endfunction
 
+function! s:get_hunks_changes()
+  if !get(b:, 'changes_view_enabled', 0) || s:is_branch_empty()
+    return []
+  endif
+  let hunks = changes#GetStats()
+  for i in hunks
+    if i > 0
+      return hunks
+    endif
+  endfor
+  return []
+endfunction
+
 function! s:get_hunks_empty()
   return ''
 endfunction
@@ -38,6 +51,8 @@ function! s:get_hunks()
       let s:source_func = 's:get_hunks_signify'
     elseif exists('*GitGutterGetHunkSummary')
       let s:source_func = 's:get_hunks_gitgutter'
+    elseif exists('*changes#GetStats')
+      let s:source_func = 's:get_hunks_changes'
     else
       let s:source_func = 's:get_hunks_empty'
     endif

doc/airline.txt

@@ -317,6 +317,7 @@ csv.vim <https://github.com/chrisbra/csv.vim>
 -------------------------------------                        *airline-hunks*
 vim-gitgutter <https://github.com/airblade/vim-gitgutter>
 vim-signify <https://github.com/mhinz/vim-signify>
+changesPlugin <https://github.com/chrisbra/changesPlugin>
 
 * enable/disable showing a summary of changed hunks under source control. >
   let g:airline#extensions#hunks#enabled = 1