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I've added these two lines to my vimrc:

:nnoremap <silent><C-j> m`:silent +g/\m^\s*$/d<CR>``:noh<CR>
:nnoremap <silent><A-j> :set paste<CR>m`o<Esc>``:set nopaste<CR>

Upon saving and reloading the vimrc (:so $MYVIMRC), only the first binding works. The second does not work. The behavior I see is like the A-j just registers as a j, with the cursor moving down a line. My expected behavior is to see the a new line added below the cursor and a return to normal mode.

As context: I am using OS X's Terminal.app, and I have "Use option as meta key" turned on in its settings.

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Do you only want to use option as the meta key for vim, or for other purposes as well? –  Dean Jun 27 '13 at 2:15
    
I'd want to get this working and then figure it out –  dimadima Jun 27 '13 at 4:15
    
<A-> mappings don't work reliably across environments and, specifically in Mac OS X's terminal emulators (<A-> and <M-> are equivalent). Use a different approach, like :help mapleader. –  romainl Jun 27 '13 at 5:32

1 Answer 1

I've never had any luck getting alt/meta working on OSX. However, you can just use the multi-byte character that is mapped to by default (when option as meta is not selected). In the case of option-j, it's .

:nnoremap <silent>∆ :set paste<CR>m`o<Esc>``:set nopaste<CR>
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