feat(select): add snacks_picker backend (#188)

* feat(select): add snacks_picker backend

Adds the
[snacks picker](https://github.com/folke/snacks.nvim/blob/main/docs/picker.md)
backend option.

Like telescope and fzf-lua, it already provides it's own override for
`vim.ui.select`, BUT since plugins like avante rely on using
dressing.nvim for picking files and such, having a backend that can
fuzzy find is more convenient than the builtin.

* Fix screenshot

* fix: bump up the priority of the snacks picker

---------

Co-authored-by: Steven Arcangeli <506791+stevearc@users.noreply.github.com>

Author: synic

README.md

@@ -42,6 +42,10 @@ Neovim 0.8.0+ (for earlier versions, use the [nvim-0.7](https://github.com/steve
 
 ![Screenshot from 2021-12-02 19-47-56](https://user-images.githubusercontent.com/506791/144542071-1aa66f81-b07c-492e-9884-fdafed1006df.png)
 
+`vim.select` (snacks_picker)
+
+![Screenshot from 2025-01-29 03-08-00](https://github.com/user-attachments/assets/4bc72539-9c81-4428-8778-f7904a16898c)
+
 `vim.select` (built-in)
 
 ![Screenshot from 2021-12-04 17-14-32](https://user-images.githubusercontent.com/506791/144729527-ede0d7ba-a6e6-41e0-be5a-1a5f16d35b05.png)
@@ -196,7 +200,7 @@ require("dressing").setup({
     enabled = true,
 
     -- Priority list of preferred vim.select implementations
-    backend = { "telescope", "fzf_lua", "fzf", "builtin", "nui" },
+    backend = { "telescope", "fzf_lua", "fzf", "builtin", "nui", "snacks_picker" },
 
     -- Trim trailing `:` from prompt
     trim_prompt = true,

lua/dressing/config.lua

@@ -67,7 +67,7 @@ local default_config = {
     enabled = true,
 
     -- Priority list of preferred vim.select implementations
-    backend = { "telescope", "fzf_lua", "fzf", "builtin", "nui" },
+    backend = { "snacks_picker", "telescope", "fzf_lua", "fzf", "builtin", "nui" },
 
     -- Trim trailing `:` from prompt
     trim_prompt = true,

lua/dressing/select/snacks_picker.lua

@@ -0,0 +1,11 @@
+local M = {}
+
+M.is_supported = function()
+  return pcall(require, "snacks.picker")
+end
+
+M.select = function(_, items, opts, on_choice)
+  return require("snacks.picker.select").select(items, opts, on_choice)
+end
+
+return M