Add new focus:parent action

Author: shanesmith

autoload/fern/mapping/node.vim

@@ -9,6 +9,7 @@ function! fern#mapping#node#init(disable_default_mappings) abort
   nnoremap <buffer><silent> <Plug>(fern-action-expand:in)     :<C-u>call <SID>call('expand_in')<CR>
   nnoremap <buffer><silent> <Plug>(fern-action-collapse)      :<C-u>call <SID>call('collapse')<CR>
   nnoremap <buffer><silent> <Plug>(fern-action-reveal)        :<C-u>call <SID>call('reveal')<CR>
+  nnoremap <buffer><silent> <Plug>(fern-action-focus:parent)  :<C-u>call <SID>call('focus_parent')<CR>
 
   nnoremap <buffer><silent> <Plug>(fern-action-enter)         :<C-u>call <SID>call('enter')<CR>
   nnoremap <buffer><silent> <Plug>(fern-action-leave)         :<C-u>call <SID>call('leave')<CR>
@@ -115,6 +116,16 @@ function! s:map_reveal(helper) abort
   return fern#internal#viewer#reveal(a:helper, path)
 endfunction
 
+function! s:map_focus_parent(helper) abort
+  let owner = a:helper.sync.get_cursor_node().__owner
+
+  if empty(owner)
+    return
+  endif
+
+  call a:helper.sync.focus_node(owner.__key)
+endfunction
+
 function! s:map_enter(helper) abort
   let node = a:helper.sync.get_cursor_node()
   if node is# v:null

doc/fern.txt

@@ -892,6 +892,9 @@ GLOBAL							*fern-mapping-global*
 *<Plug>(fern-action-reveal)*
 	Open a prompt to reveal a node in a tree.
 
+*<Plug>(fern-action-focus:parent)*
+	Focus the parent of the cursor node.
+
 *<Plug>(fern-action-enter)*
 	Open a new fern buffer which root node is a cursor node. In other
 	word, get enter the directory.