Force R to use existing tmux session about nvim-r HOT 11 CLOSED

On Ubuntu 16.04, if Vim is already running in a Tmux session, \rf starts R in a Tmux split pane. I tested with this minimal vimrc:

set nocompatible
call plug#begin('~/.config/nvim/plugged')
Plug 'jalvesaq/Nvim-R'
call plug#end()
filetype plugin indent on
syntax on
let R_tmux_split = 1

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My goal is to incentive the use of Neovim because its setup is simpler for new users. If using Neovim and running R in a Neovim buffer, the plugin will depend only on R, which is an obvious dependency. No special configuration is required in the vimrc, bashrc, Rprofile or tmux.conf. The option R_tmux_split is in the FAQ section because if it was in the Options section I would have to bring all the complication from Vim-R-plugin Installation and Use sections to Nvim-R.

We may let this issue open for some weeks because Vim-R-plugin users will find it useful.

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@jimhester @jalvesaq would you be willing to help me preserve the behavior of the Vim-R-Plugin on OS X?
I would prefer to have R open in another Tmux pane instead of its own window.

I have tried setting let g:R_tmux_split = 1 in my .vimrc but now I am receiving the error:

Error detected while processing function StartR: line 119: E117: Unknown function: StartR_TmuxSplit

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If I remove the let g:R_tmux_split = 1 from my .vimrc, R starts as expected, but in a new window.

I am running tmux version 2.1 and a custom-built Vim 7.4 with +channel +conceal +job enabled.

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Are you sure that you do not have old files in your .vim directory? The file R/tmux_split.vim will not be completely sourced (and, consequently, the function StartR_TmuxSplit will not be defined) if the function TmuxActivePane is already defined. If you do this

cd ~/.vim
grep -R 'function TmuxActivePane'

the searched string should be found in only one script (R/tmux_split.vim).

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After grepping the .vim directory this was the only file to contain this function declaration.

cd ~/.vim
grep -rnw "." -e 'function TmuxActivePane'
./plugged/Nvim-R/R/tmux_split.vim:7:function TmuxActivePane()

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I even tried installing Nvim-R as a Vimball file (version 0.9.3) and removing and cleaning the plugged version.

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@jalvesaq Thank you for all of your help. I found the issue to be this line in my .vimrc.

set ft = R

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I had the same problem as Jim.
I thought it had something to do with Tmux but the let g:R_tmux_split = 1 in the .vimrc fixed it.

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I installed the development version of Tmux (2.4) and it works with both options R_tmux_split=0 and R_tmux_split=1.

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Hi Jakson,
Thanks for looking into this. I was getting a NvimR "server" error when entering F2 to connect to R. But it's working reliably now.

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