Feat: add focus on tree functionality (#563)

README.md

@@ -115,7 +115,7 @@ let g:nvim_tree_icons = {
 nnoremap <C-n> :NvimTreeToggle<CR>
 nnoremap <leader>r :NvimTreeRefresh<CR>
 nnoremap <leader>n :NvimTreeFindFile<CR>
-" NvimTreeOpen and NvimTreeClose are also available if you need them
+" NvimTreeOpen, NvimTreeClose and NvimTreeFocus are also available if you need them
 
 set termguicolors " this variable must be enabled for colors to be applied properly
 

doc/nvim-tree-lua.txt

@@ -33,6 +33,10 @@ closes the tree
 
 open or close the tree
 
+|:NvimTreeFocus| 	                          *:NvimTreeFocus*
+
+open the tree if it is closed, and then focus on the tree
+
 |:NvimTreeRefresh|			          *:NvimTreeRefresh*
 
 refresh the tree

lua/nvim-tree.lua

@@ -11,6 +11,13 @@ local api = vim.api
 
 local M = {}
 
+function M.focus()
+  if not view.win_open() then
+    lib.open()
+  end
+  view.focus();
+end
+
 function M.toggle()
   if view.win_open() then
     view.close()

plugin/tree.vim

@@ -37,6 +37,7 @@ augroup end
 command! NvimTreeOpen lua require'nvim-tree'.open()
 command! NvimTreeClose lua require'nvim-tree'.close()
 command! NvimTreeToggle lua require'nvim-tree'.toggle()
+command! NvimTreeFocus lua require'nvim-tree'.focus()
 command! NvimTreeRefresh lua require'nvim-tree'.refresh()
 command! NvimTreeClipboard lua require'nvim-tree'.print_clipboard()
 command! NvimTreeFindFile lua require'nvim-tree'.find_file(true)