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I want to send commands to tmux to run Elixir tests from vim. Using the % variable allows me to run the command to run a test for a single file. The relevant line in my .vimrc is

nmap <silent> <leader>ef :! tmux send -t 0.1 'mix test %:p' Enter<CR><c-L>

This sends, for example, mix test /path/to/spec.exs when I'm in a spec. That works for testing a single file.

Now I want to be able to run a single test. The command would have the format

mix test /path/to/test.exs:<lineno>, so the path, a colon, and the line number. I tried things like line(.), but I can't figure out how to interpolate that inside of a tmux send string.

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Here's an example of inserting line number in a shell command:

:exe "!echo " . line(".")

So your mapping would be something like this:

nnoremap <silent> <leader>ef :exe "!tmux send -t 0.1 'mix test %:p:" . line(".") . "' Enter"<CR><C-L>

I run tmux so I was able to test that the command appeared in a tmux pane (though I can't actually verify the command since I don't have 'mix').

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    Turns out I was using the wrong concatenation operator. Also, <c-L> clears the output of the shell exit code so vim doesn't switch to the output. Thanks. – nickcoxdotme Oct 16 '17 at 15:11
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    Oh, so it does. That's handy. I'll add it back. Cheers. – B Layer Oct 16 '17 at 17:18

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