Fix missing key case, add BC type checking (#1206)

* Fix missing key case, add BC type checking

Resolves #1205

* Assign g:NERDTreeCustomOpenArgs also before quick return

* Fix syntax to be compatibile with Vim 7.3

CHANGELOG.md

@@ -5,6 +5,7 @@
         - **.PATCH**: Pull Request Title (PR Author) [PR Number](Link to PR)
 -->
 #### 6.9
+- **.12**: Respect NERDTreeCustomOpenArgs when opening bookmark (przepompownia) [#1200](https://github.com/preservim/nerdtree/pull/1200)
 - **.11**: Revamp the README. (buncis, PhilRunninger) [#1192](https://github.com/preservim/nerdtree/pull/1192), [#1193](https://github.com/preservim/nerdtree/pull/1193)
 - **.10**: Open a mirrored NERDTree with correct width (PhilRunninger) [#1177](https://github.com/preservim/nerdtree/pull/1177)
 - **.9**: Updated Readme, removed typo (H3RSKO) [#1167](https://github.com/preservim/nerdtree/pull/1167)

README.markdown

@@ -162,6 +162,11 @@ autocmd BufEnter * if tabpagenr('$') == 1 && winnr('$') == 1 && exists('b:NERDTr
 " Open the existing NERDTree on each new tab.
 autocmd BufWinEnter * silent NERDTreeMirror
 ```
+or change your NERDTree-launching shortcut key like so:
+```vim
+" Mirror the NERDTree before showing it. This makes it the same on all tabs.
+nnoremap <C-n> :NERDTreeMirror<CR>:NERDTreeFocus<CR>
+```
 
 ### How can I change the default arrows?
 

autoload/nerdtree/ui_glue.vim

@@ -108,10 +108,41 @@ function! s:customOpenBookmark(node) abort
 endfunction
 
 "FUNCTION: s:initCustomOpenArgs() {{{1
-" Make sure NERDTreeCustomOpenArgs has needed keys
 function! s:initCustomOpenArgs() abort
-    let g:NERDTreeCustomOpenArgs = get(g:, 'NERDTreeCustomOpenArgs', {})
-    return extend(g:NERDTreeCustomOpenArgs, {'file':{'reuse': 'all', 'where': 'p'}, 'dir':{}}, 'keep')
+    let l:defaultOpenArgs = {'file': {'reuse': 'all', 'where': 'p'}, 'dir': {}}
+    let l:customOpenArgs = get(g:, 'NERDTreeCustomOpenArgs', {})
+
+    if !s:validateType(l:customOpenArgs, type({})) || empty(l:customOpenArgs)
+        let g:NERDTreeCustomOpenArgs = l:customOpenArgs
+        return l:defaultOpenArgs
+    endif
+
+    for l:typeKey in keys(l:defaultOpenArgs)
+        if !s:validateType(get(l:customOpenArgs, l:typeKey, {}), type({}))
+              \ || !has_key(l:customOpenArgs, l:typeKey)
+            let l:customOpenArgs[l:typeKey] = l:defaultOpenArgs[l:typeKey]
+            continue
+        endif
+
+        for l:optionName in keys(l:defaultOpenArgs[l:typeKey])
+            if s:validateType(get(l:customOpenArgs[l:typeKey], l:optionName, v:null), type(''))
+                continue
+            endif
+            let l:customOpenArgs[l:typeKey][l:optionName] = l:defaultOpenArgs[l:typeKey][l:optionName]
+        endfor
+    endfor
+
+    let g:NERDTreeCustomOpenArgs = l:customOpenArgs
+
+    return extend(l:customOpenArgs, l:defaultOpenArgs, 'keep')
+endfunction
+
+function! s:validateType(variable, type) abort
+    if type(a:variable) == a:type
+        return v:true
+    endif
+
+    return v:false
 endfunction
 
 "FUNCTION: s:activateAll() {{{1
@@ -500,9 +531,10 @@ function! nerdtree#ui_glue#openBookmark(name) abort
     endtry
     if l:bookmark.path.isDirectory
         call l:bookmark.open(b:NERDTree)
-    else
-        call l:bookmark.open(b:NERDTree, {'where': 'p'})
+        return
     endif
+
+    call l:bookmark.open(b:NERDTree, s:initCustomOpenArgs().file)
 endfunction
 
 " FUNCTION: s:openHSplit(target) {{{1