feat: add get_filetype option for snippet source (#352)

Closes #292

Author: niuiic

README.md

@@ -384,6 +384,9 @@ MiniDeps.add({
           global_snippets = { 'all' },
           extended_filetypes = {},
           ignored_filetypes = {},
+          get_filetype = function(context)
+            return vim.bo.filetype
+          end
         }
 
         --- Example usage for disabling the snippet provider after pressing trigger characters (i.e. ".")

lua/blink/cmp/sources/snippets/init.lua

@@ -4,6 +4,7 @@
 --- @field global_snippets string[]
 --- @field extended_filetypes table<string, string[]>
 --- @field ignored_filetypes string[]
+--- @field get_filetype fun(context: blink.cmp.Context): string
 
 local snippets = {}
 
@@ -13,11 +14,12 @@ function snippets.new(opts)
   self.cache = {}
   --- @type blink.cmp.SnippetsOpts
   self.registry = require('blink.cmp.sources.snippets.registry').new(opts or {})
+  self.get_filetype = opts.get_filetype or function() return vim.bo.filetype end
   return self
 end
 
-function snippets:get_completions(_, callback)
-  local filetype = vim.bo.filetype
+function snippets:get_completions(context, callback)
+  local filetype = self.get_filetype(context)
   if vim.tbl_contains(self.registry.config.ignored_filetypes, filetype) then return callback() end
 
   if not self.cache[filetype] then