Allow mapping multiple keys to single action.

README.md

@@ -47,7 +47,7 @@ let g:lua_tree_show_icons = {
 " You don't have to define all keys.
 " NOTE: the 'edit' key will wrap/unwrap a folder and open a file
 let g:lua_tree_bindings = {
-    \ 'edit':            '<CR>',
+    \ 'edit':            ['<CR>', 'o'],
     \ 'edit_vsplit':     '<C-v>',
     \ 'edit_split':      '<C-x>',
     \ 'edit_tab':        '<C-t>',

doc/nvim-tree-lua.txt

@@ -192,7 +192,7 @@ you can change default keybindings by defining this variable.
 default keybindings will be applied to undefined keys.
 >
     let g:lua_tree_bindings = {
-        \ edit:          '<cr>',
+        \ edit:          ['<cr>', 'o'], // Multiple keys provided via list
         \ edit_vsplit:   '<c-v>',
         \ edit_split:    '<c-x>',
         \ edit_tab:      '<c-t>',

lua/lib/config.lua

@@ -45,7 +45,7 @@ end
 function M.get_bindings()
   local keybindings = vim.g.lua_tree_bindings or {}
   return {
-    edit            = keybindings.edit or '<CR>',
+    edit            = keybindings.edit or {'<CR>', 'o'},
     edit_vsplit     = keybindings.edit_vsplit or '<C-v>',
     edit_split      = keybindings.edit_split or '<C-x>',
     edit_tab        = keybindings.edit_tab or '<C-t>',

lua/lib/lib.lua

@@ -207,6 +207,12 @@ function M.change_dir(foldername)
   M.init(false, M.Tree.bufnr ~= nil)
 end
 
+local function set_mapping(buf, key, fn)
+  api.nvim_buf_set_keymap(buf, 'n', key, ':lua require"tree".'..fn..'<cr>', {
+      nowait = true, noremap = true, silent = true
+    })
+end
+
 local function set_mappings()
   if vim.g.lua_tree_disable_keybindings == 1 then
       return
@@ -239,9 +245,13 @@ local function set_mappings()
   }
 
   for k,v in pairs(mappings) do
-    api.nvim_buf_set_keymap(buf, 'n', k, ':lua require"tree".'..v..'<cr>', {
-        nowait = true, noremap = true, silent = true
-      })
+    if type(k) == 'table' then
+      for _, key in pairs(k) do
+        set_mapping(buf, key, v)
+      end
+    else
+      set_mapping(buf, k, v)
+    end
   end
 end