Add Snippets support for vim-vsnip.

Author: halkn

README.md

@@ -11,7 +11,7 @@ supported.
 - Asynchronous completion using the `libuv` api.
 - Automatically open hover windows when popupmenu is available.
 - Automatically open signature help if it's available.
-- Snippets integration with UltiSnips and Neosnippet.
+- Snippets integration with UltiSnips and Neosnippet and Vsnip.
 - Apply *additionalTextEdits* in LSP spec if it's available.
 - Chain completion support inspired by ![vim-mucomplete](https://github.com/lifepillar/vim-mucomplete)
 
@@ -101,10 +101,10 @@ inoremap <silent><expr> <TAB>
 - By default other snippets source support are disabled, turn them on by
 
 ```vim
-" possible value: 'UltiSnips', 'Neosnippet'
+" possible value: 'UltiSnips', 'Neosnippet', 'Vsnip'
 let g:completion_enable_snippet = 'UltiSnips'
 ```
-- Support `UltiSnips` and `Neosnippet`
+- Support `UltiSnips` and `Neosnippet` and `Vsnip`
 
 ### LSP Based Snippet parsing
 

doc/completion-nvim.txt

@@ -24,7 +24,7 @@ FEATURE                                                  *completion-features*
 - Asynchronous completion using libuv api.
 - Automatically open hover windows when popupmenu is available.
 - Automatically open signature help if it's available.
-- Snippets integration with UltiSnips and Neosnippet.
+- Snippets integration with UltiSnips and Neosnippet and Vsnip.
 - ins-complete method integration
 - Apply additionalTextEdits in LSP spec if it's available.
 - Chain completion support inspired by vim-mucomplete
@@ -87,7 +87,7 @@ g:completion_enable_auto_popup               *g:completion_enable_auto_popup*
 g:completion_enable_snippet                      *g:completion_enable_snippet*
 
         You can specify which snippet engines you want to use. Possible values
-        are |UltiSnips| and |Neosnippet|.
+        are |UltiSnips| and |Neosnippet| and |Vsnip|.
 
         Note: Snippet engines will not work without setting this variables.
 

lua/completion.lua

@@ -76,6 +76,8 @@ function M.confirmCompletion()
       api.nvim_call_function('UltiSnips#ExpandSnippet', {})
     elseif complete_item.kind == 'Neosnippet' then
       api.nvim_input("<c-r>".."=neosnippet#expand('"..complete_item.word.."')".."<CR>")
+    elseif complete_item.kind == 'Vsnip' then
+      api.nvim_call_function('vsnip#expand', {})
     end
     M.completionConfirm = false
   end

lua/completion/health.lua

@@ -29,8 +29,14 @@ local checkSnippetSource = function()
     else
       health_error("Neosnippet is not available! Check if you install Neosnippet correctly.")
     end
+  elseif snippet_source == 'Vsnip' then
+    if string.match(api.nvim_get_option("rtp"), ".*vsnip.*") then
+      health_ok("You are using Vsnip as your snippet source")
+    else
+      health_error("Vsnip is not available! Check if you install Vsnip correctly.")
+    end
   else
-    health_error("You're snippet source is not available! possible value are: UltiSnips, Neosnippet")
+    health_error("You're snippet source is not available! possible value are: UltiSnips, Neosnippet, Vsnip")
   end
 end
 

lua/source/snippet.lua

@@ -51,13 +51,39 @@ local getNeosnippetItems = function(prefix)
   return complete_items
 end
 
+local getVsnipItems = function(prefix)
+  if vim.fn.exists("*vsnip#source#find") == 0 then return {} end
+  local snippetsList = api.nvim_call_function('vsnip#source#find', {api.nvim_buf_get_option(0, 'filetype')})
+  local complete_items = {}
+  if vim.tbl_isempty(snippetsList) == 0 then
+    return {}
+  end
+  local priority = vim.g.completion_items_priority['Vsnip']
+  for sourceIdx, source in pairs(snippetsList) do
+    for snippetIdx, snippet in pairs(source) do
+      for prefixIdx, word in pairs(snippet.prefix) do
+        local user_data = {hover = snippet.description}
+        local item = {}
+        item.word = word
+        item.kind = 'Vsnip'
+        item.priority = priority
+        item.user_data = user_data
+        match.matching(complete_items, prefix, item)
+      end
+    end
+  end
+  return complete_items
+end
+
 M.getCompletionItems = function(prefix, score_func, _)
   local source = vim.g.completion_enable_snippet
   local snippet_list = {}
   if source == 'UltiSnips' then
     snippet_list = getUltisnipItems(prefix, score_func)
   elseif source == 'Neosnippet' then
     snippet_list = getNeosnippetItems(prefix, score_func)
+  elseif source == 'Vsnip' then
+    snippet_list = getVsnipItems(prefix, source_func)
   end
   return snippet_list
 end