rework: allow multiple snippets

doc: update document

Author: haorenW1025

doc/completion-nvim.txt

@@ -239,6 +239,9 @@ g:completion_chain_complete_list	    *g:completion_chain_complete_list*
 	"lsp": lsp completion
 	"snippet": snippet sources based on g:completion_enable_snippet
 	"path": path completion relative to the current file.
+	"UltiSnips": ultisnips source
+	"Neosnippet": neosnippet source
+	"vim-vsnip": vim-vsnip source
 <
 
 	For ins-complete sources, possible 'mode' to the actual key in vim are

lua/completion/source.lua

@@ -24,6 +24,15 @@ local complete_items_map = {
     trigger = path.triggerFunction,
     trigger_character = {'/'}
   },
+  ['UltiSnips'] = {
+    item = snippet.getUltisnipItems
+  },
+  ['vim-vsnip'] = {
+    item = snippet.getVsnipItems
+  },
+  ['Neosnippet'] = {
+    item = snippet.getNeosnippetItems
+  }
 }
 
 M.prefixLength = 0

lua/completion/source/snippet.lua

@@ -4,7 +4,7 @@ local match = require'completion.matching'
 local M = {}
 
 
-local getUltisnipItems = function(prefix)
+M.getUltisnipItems = function(prefix)
   if vim.fn.exists("*UltiSnips#SnippetsInCurrentScope") == 0 then return {} end
   local snippetsList = api.nvim_call_function('UltiSnips#SnippetsInCurrentScope', {})
   local complete_items = {}
@@ -28,7 +28,7 @@ local getUltisnipItems = function(prefix)
   return complete_items
 end
 
-local getNeosnippetItems = function(prefix)
+M.getNeosnippetItems = function(prefix)
   if vim.fn.exists("*neosnippet#helpers#get_completion_snippets") == 0 then return {} end
   local snippetsList = api.nvim_call_function('neosnippet#helpers#get_completion_snippets', {})
   local complete_items = {}
@@ -51,7 +51,7 @@ local getNeosnippetItems = function(prefix)
   return complete_items
 end
 
-local getVsnipItems = function(prefix)
+M.getVsnipItems = function(prefix)
   if vim.fn.exists('g:loaded_vsnip') == 0 then return {} end
   local snippetsList = api.nvim_call_function('vsnip#source#find', {api.nvim_buf_get_option(0, 'filetype')})
   local complete_items = {}
@@ -76,15 +76,15 @@ local getVsnipItems = function(prefix)
   return complete_items
 end
 
-M.getCompletionItems = function(prefix, score_func, _)
+M.getCompletionItems = function(prefix)
   local source = vim.g.completion_enable_snippet
   local snippet_list = {}
   if source == 'UltiSnips' then
-    snippet_list = getUltisnipItems(prefix, score_func)
+    snippet_list = M.getUltisnipItems(prefix)
   elseif source == 'Neosnippet' then
-    snippet_list = getNeosnippetItems(prefix, score_func)
+    snippet_list = M.getNeosnippetItems(prefix)
   elseif source == 'vim-vsnip' then
-    snippet_list = getVsnipItems(prefix, score_func)
+    snippet_list = M.getVsnipItems(prefix)
   end
   return snippet_list
 end