Merged unite source by Skeept.

autoload/unite/sources/ultisnips.vim

@@ -0,0 +1,56 @@
+let s:save_cpo = &cpo
+set cpo&vim
+
+let s:unite_source = {
+      \ 'name': 'ultisnips',
+      \ 'hooks': {},
+      \ 'action_table': {},
+      \ 'default_action': 'expand',
+      \ }
+
+let s:unite_source.action_table.preview = {
+      \ 'description' : 'ultisnips snippets',
+      \ 'is_quit' : 0,
+      \ }
+
+function! s:unite_source.action_table.preview.func(candidate)
+  " no nice preview at this point, cannot get snippet text
+  let snippet_preview = a:candidate['word']
+  echo snippet_preview
+endfunction
+
+let s:unite_source.action_table.expand = {
+      \ 'description': 'expand the current snippet',
+      \ 'is_quit': 1
+      \}
+
+function! s:unite_source.action_table.expand.func(candidate)
+  let delCurrWord = (getline(".")[col(".")-1] == " ") ? "" : "diw"
+  exe "normal " . delCurrWord . "a" . a:candidate['trigger'] . " "
+  call UltiSnips#ExpandSnippet()
+  return ''
+endfunction
+
+function! s:unite_source.gather_candidates(args, context)
+  let default_val = {'word': '', 'unite__abbr': '', 'is_dummy': 0, 'source':
+        \  'ultisnips', 'unite__is_marked': 0, 'kind': 'command', 'is_matched': 1,
+        \    'is_multiline': 0}
+  let snippet_list = UltiSnips#SnippetsInCurrentScope()
+  let canditates = []
+  for snip in items(snippet_list)
+    let curr_val = copy(default_val)
+    let curr_val['word'] = snip[0] . "     " . snip[1]
+    let curr_val['trigger'] = snip[0]
+    call add(canditates, curr_val)
+  endfor
+  return canditates
+endfunction
+
+function! unite#sources#ultisnips#define()
+  return s:unite_source
+endfunction
+
+"unlet s:unite_source
+
+let &cpo = s:save_cpo
+unlet s:save_cpo

doc/UltiSnips.txt

@@ -236,7 +236,7 @@ vimrc file. >
    let g:UltiSnipsJumpBackwardTrigger="<s-tab>"
 
 UltiSnips will only map the jump triggers while a snippet is active to
-interfer as little as possible with other mappings. 
+interfer as little as possible with other mappings.
 
 The default value for g:UltiSnipsJumpBackwardTrigger interferes with the
 built-in complete function: |i_CTRL-X_CTRL-K|. A workaround is to add the
@@ -1284,6 +1284,22 @@ offers a really nice completion dialogue for snippets.
 neocomplete - UltiSnips ships with a source for neocomplete and therefore
 offers out of the box completion dialogue support for it too.
 
+unite - UltiSnips has a source for unite. As an example of how you can use the
+it add the following function and mappings to your vimrc: >
+
+  function! UltiSnipsCallUnite()
+    Unite -start-insert -winheight=100 -immediately -no-empty ultisnips
+    return ''
+  endfunction
+
+  inoremap <silent> <F12> <C-R>=(pumvisible()? "\<LT>C-E>":"")<CR><C-R>=UltiSnipsCallUnite()<CR>
+  nnoremap <silent> <F12> a<C-R>=(pumvisible()? "\<LT>C-E>":"")<CR><C-R>=UltiSnipsCallUnite()<CR>
+
+When typing <F12> in either insert or normal mode you will get the unite
+interface with matching snippets. Pressing enter will expand the corresponding
+snippet. If only one snippet matches the text in front of the cursor will be
+expanded when you press the <F12> key.
+
 Supertab - UltiSnips has built-in support for Supertab. Just use a recent
 enough version of both plugins and <tab> will either expand a snippet or defer
 to Supertab for expansion.

test.py

@@ -3406,6 +3406,20 @@ class Plugin_Neocomplete_BugTest(_VimTest):
         vim_config.append('let g:neocomplete#enable_auto_delimiter = 1')
         vim_config.append('let g:neocomplete#enable_refresh_always = 1')
 # End: Plugin: Neocomplete  #}}}
+# Plugin: unite {{{#
+class Plugin_unite_BugTest(_VimTest):
+    plugins = ["Shougo/unite.vim"]
+    snippets = ("t", "Hello", "", "w")
+    keys = "iab\\ t=UltiSnipsCallUnite()\n"
+    wanted = "iab\\ Hello "
+
+    def _extra_options_pre_init(self, vim_config):
+        vim_config.append(r'set iskeyword+=\\ ')
+        vim_config.append('function! UltiSnipsCallUnite()')
+        vim_config.append('  Unite -start-insert -winheight=100 -immediately -no-empty ultisnips')
+        vim_config.append('  return ""')
+        vim_config.append('endfunction')
+# End: Plugin: unite  #}}}
 # Plugin: Supertab {{{#
 class Plugin_SuperTab_SimpleTest(_VimTest):
     plugins = ["ervandew/supertab"]