Open new tab only if it doesn't exists, otherwise switch to the already open tab.

[moeabdol]

I <3 NERDTree; however, my memory falls short most of the time when trying to remember which tabs I have opened. Or even worse, I get lazy eyeballing and verifying if a certain tab is already open.
When I select a file in NERDTree and press t to open it in a tab, I realize I have now two tabs open that are pointing to the same file. For example.
| Foo.txt | Bar.txt | Foo.txt |

This was also documented on stack overflow
http://stackoverflow.com/questions/27172873/vim-nerdtree-how-to-prohibit-duplicate-files-in-tabs

It would be really cool if NERDTree would switch to the existing tab.

This issue if solved, will shutdown all NERDTree haters especially them oil-vinegar, ctrl-p netrw trolls.

[scrooloose]

Grab the latest version and stick this in ~/.vim/nerdtree_plugin/override_tab_mapping.vim

https://gist.github.com/scrooloose/0495cade24f1f2ebb602

Let me know if there are any problems :)

[moeabdol]

Thanks @scrooloose works like a charm 👍

[kjyv]

If one also wants this for double clicking files (when configured to open in tabs), add the following line to that file (right after the first):
call NERDTreeAddKeyMap({ 'key': '<2-LeftMouse>', 'callback': 'NERDTreeMyOpenInTab', 'scope': "FileNo de", 'override': 1})