feat: add prefiltering to treesitter picker (#879)

doc/telescope.txt

@@ -470,6 +470,9 @@ builtin.file_browser({opts})                          *builtin.file_browser()*
 
 builtin.treesitter()                                    *builtin.treesitter()*
     Lists function names, variables, and other symbols from treesitter queries
+    - Default keymaps:
+      - `<C-l>`: show autocompletion menu to prefilter your query by kind of ts
+        node you want to see (i.e. `:var:`)
 
 
     Fields: ~

lua/telescope/builtin/files.lua

@@ -348,7 +348,10 @@ files.treesitter = function(opts)
       entry_maker = opts.entry_maker or make_entry.gen_from_treesitter(opts)
     },
     previewer = conf.grep_previewer(opts),
-    sorter = conf.generic_sorter(opts),
+    sorter = conf.prefilter_sorter{
+      tag = "kind",
+      sorter = conf.generic_sorter(opts)
+    }
   }):find()
 end
 

lua/telescope/builtin/init.lua

@@ -73,6 +73,8 @@ builtin.fd = builtin.find_files
 builtin.file_browser = require('telescope.builtin.files').file_browser
 
 --- Lists function names, variables, and other symbols from treesitter queries
+--- - Default keymaps:
+---   - `<C-l>`: show autocompletion menu to prefilter your query by kind of ts node you want to see (i.e. `:var:`)
 ---@field show_line boolean: if true, shows the row:column that the result is found at (default is true)
 builtin.treesitter = require('telescope.builtin.files').treesitter