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

doc/nvim-tree-lua.txt

@@ -1425,6 +1425,13 @@ api.tree.toggle_help()                       *nvim-tree.api.tree.toggle_help()*
     - navigate.prev
     - navigate.select
 
+                           *nvim-tree.api.config.mappings.default_on_attach()*
+api.config.mappings.default_on_attach({bufnr})
+    Set all |nvim-tree-mappings-default|. Call from your |nvim-tree.on_attach|
+
+    Parameters: ~
+      • {bufnr} (number) nvim-tree buffer number passed to |nvim-tree.on_attach|
+
 api.config.mappings.active()          *nvim-tree.api.config.mappings.active()*
     Deprecated: only functions when using legacy |nvim-tree.view.mappings|
     Retrieve a clone of the currently active mappings: defaults + user.
@@ -1490,14 +1497,13 @@ will be applied.
 
 You are encouraged to copy these to your own |nvim-tree.on_attach| function.
 >
-  local on_attach = function(bufnr)
   local api = require('nvim-tree.api')
 
-    -- BEGIN_DEFAULT_ON_ATTACH
-    local opts = function(desc)
+  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'))
@@ -1551,6 +1557,20 @@ You are encouraged to copy these to your own |nvim-tree.on_attach| function.
   vim.keymap.set('n', '<2-LeftMouse>',  api.node.open.edit,           opts('Open'))
   vim.keymap.set('n', '<2-RightMouse>', api.tree.change_root_to_node, opts('CD'))
   -- END_DEFAULT_ON_ATTACH
+<
+Alternatively, you may apply these default mappings from your |nvim-tree.on_attach| via
+|nvim-tree.api.config.mappings.default_on_attach()| e.g.
+>
+  local function my_on_attach(bufnr)
+    local api = require('nvim-tree.api')
+
+    local function opts(desc)
+      return { desc = 'nvim-tree: ' .. desc, buffer = bufnr, noremap = true, silent = true, nowait = true }
+    end
+
+    api.config.mappings.default_on_attach(bufnr)
+
+    -- your removals and mappings go here
   end
 <
 ==============================================================================

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'))

scripts/update-help.sh

@@ -29,16 +29,13 @@ begin="BEGIN_DEFAULT_ON_ATTACH"
 end="END_DEFAULT_ON_ATTACH"
 
 # scrape DEFAULT_ON_ATTACH, indented at 2
-sed -n -e "/${begin}/,/${end}/{ /${begin}/d; /${end}/d; p; }" lua/nvim-tree/keymap.lua > /tmp/DEFAULT_ON_ATTACH.2.lua
+sed -n -e "/${begin}/,/${end}/{ /${begin}/d; /${end}/d; p; }" lua/nvim-tree/keymap.lua > /tmp/DEFAULT_ON_ATTACH.lua
 
-# indent some more
-sed -e "s/^  /    /" /tmp/DEFAULT_ON_ATTACH.2.lua > /tmp/DEFAULT_ON_ATTACH.4.lua
-
-# help, indented at 4
-sed -i -e "/${begin}/,/${end}/{ /${begin}/{p; r /tmp/DEFAULT_ON_ATTACH.4.lua
+# help
+sed -i -e "/${begin}/,/${end}/{ /${begin}/{p; r /tmp/DEFAULT_ON_ATTACH.lua
            }; /${end}/p; d; }" doc/nvim-tree-lua.txt
 
-# legacy keymap, indented at 2
-sed -i -e "/${begin}/,/${end}/{ /${begin}/{p; r /tmp/DEFAULT_ON_ATTACH.2.lua
+# legacy keymap
+sed -i -e "/${begin}/,/${end}/{ /${begin}/{p; r /tmp/DEFAULT_ON_ATTACH.lua
            }; /${end}/p; d; }" lua/nvim-tree/keymap-legacy.lua