feat(select): add support for fzf-lua (#14)

lua/dressing/config.lua

@@ -28,7 +28,7 @@ local default_config = {
   },
   select = {
     -- Priority list of preferred vim.select implementations
-    backend = { "telescope", "fzf", "builtin", "nui" },
+    backend = { "telescope", "fzf_lua", "fzf", "builtin", "nui" },
 
     -- Options for telescope selector
     telescope = {
@@ -44,6 +44,14 @@ local default_config = {
       },
     },
 
+    -- Options for fzf_lua selector
+    fzf_lua = {
+      winopts = {
+        width = 0.5,
+        height = 0.4,
+      },
+    },
+
     -- Options for nui Menu
     nui = {
       position = "50%",

lua/dressing/select/fzf_lua.lua

@@ -0,0 +1,33 @@
+local M = {}
+
+M.is_supported = function()
+  return pcall(require, "fzf-lua")
+end
+
+M.select = function(config, items, opts, on_choice)
+  local fzf = require("fzf-lua")
+  local labels = {}
+  for i, item in ipairs(items) do
+    table.insert(labels, string.format("%d: %s", i, opts.format_item(item)))
+  end
+
+  local fzf_opts = vim.tbl_deep_extend("keep", config, {
+    fzf_opts = {
+      ["--no-multi"] = "",
+      ["--preview-window"] = "hidden:right:0",
+    },
+  })
+  fzf.fzf_wrap(fzf_opts, labels, function(selected)
+    if not selected then
+      on_choice(nil, nil)
+    else
+      local label = selected[1]
+      local colon = string.find(label, ":")
+      local lnum = tonumber(string.sub(label, 1, colon - 1))
+      local item = items[lnum]
+      on_choice(item, lnum)
+    end
+  end)()
+end
+
+return M

tests/manual/select.lua

@@ -0,0 +1,21 @@
+-- Run this test with :source %
+
+local function run_test(backend)
+  local config = require("dressing.config")
+  local prev_backend = config.select.backend
+  config.select.backend = backend
+  vim.ui.select({ "first", "second", "third" }, {
+    prompt = "Make selection",
+    kind = "test",
+  }, function(item, lnum)
+    if item and lnum then
+      vim.notify(string.format("selected '%s' (idx %d)", item, lnum), vim.log.levels.INFO)
+    else
+      vim.notify("Selection canceled", vim.log.levels.INFO)
+    end
+    config.select.backend = prev_backend
+  end)
+end
+
+-- Replace this with the desired backend to test
+run_test("fzf_lua")