feat(api): add api.config.mappings.default_on_attach (#2037)

lua/nvim-tree/api.lua

@@ -170,6 +170,8 @@ Api.marks.navigate.next = require("nvim-tree.marks.navigation").next
 Api.marks.navigate.prev = require("nvim-tree.marks.navigation").prev
 Api.marks.navigate.select = require("nvim-tree.marks.navigation").select
 
+Api.config.mappings.default_on_attach = require("nvim-tree.keymap").default_on_attach
+
 Api.config.mappings.active = function()
   return require("nvim-tree.keymap-legacy").active_mappings_clone()
 end

lua/nvim-tree/keymap-legacy.lua

@@ -37,11 +37,10 @@ local BEGIN_ON_ATTACH = [[
 -- Please see https://github.com/nvim-tree/nvim-tree.lua/wiki/Migrating-To-on_attach for assistance in migrating.
 --
 
-local api = require('nvim-tree.api')
+local function on_attach(bufnr)
+  local api = require('nvim-tree.api')
 
-local on_attach = function(bufnr)
-
-  local opts = function(desc)
+  local function opts(desc)
     return { desc = 'nvim-tree: ' .. desc, buffer = bufnr, noremap = true, silent = true, nowait = true }
   end
 ]]

lua/nvim-tree/keymap.lua

@@ -1,14 +1,14 @@
-local api = require "nvim-tree.api"
-
 local M = {}
 
 -- stylua: ignore start
 function M.default_on_attach(bufnr)
-  -- BEGIN_DEFAULT_ON_ATTACH
-  local opts = function(desc)
+  local api = require('nvim-tree.api')
+
+  local function opts(desc)
     return { desc = 'nvim-tree: ' .. desc, buffer = bufnr, noremap = true, silent = true, nowait = true }
   end
 
+  -- BEGIN_DEFAULT_ON_ATTACH
   vim.keymap.set('n', '<C-]>', api.tree.change_root_to_node,          opts('CD'))
   vim.keymap.set('n', '<C-e>', api.node.open.replace_tree_buffer,     opts('Open: In Place'))
   vim.keymap.set('n', '<C-k>', api.node.show_info_popup,              opts('Info'))