Add telescopes provider (#168)

Amendment: replace the old `builtin`

lua/telescope/actions.lua

@@ -165,6 +165,15 @@ actions.set_command_line = function(prompt_bufnr)
   vim.cmd(entry.value)
 end
 
+actions.run_builtin = function(prompt_bufnr)
+  local entry = actions.get_selected_entry(prompt_bufnr)
+
+  actions.close(prompt_bufnr)
+  vim.cmd [[startinsert]]
+
+  require('telescope.builtin')[entry.text]()
+end
+
 -- TODO: Think about how to do this.
 actions.insert_value = function(prompt_bufnr)
   local entry = actions.get_selected_entry(prompt_bufnr)

lua/telescope/builtin.lua

@@ -523,6 +523,10 @@ builtin.builtin = function(opts)
     },
     previewer = previewers.qflist.new(opts),
     sorter = conf.generic_sorter(opts),
+    attach_mappings = function(_, map)
+      map('i', '<CR>', actions.run_builtin)
+      return true
+    end
   }):find()
 end