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I'm having some problems remapping my home key; it works when I run Vim from tmux but not when I run it from a regular xterm without tmux. It looks like they're sending different escape codes and Vim only picks up on tmux's one for some reason.

I tried mucking about with a lot of TERM values, to no avail. So I figured I'd just hard-code this escape code in my vimrc and move on:

set nocompatible " `^[` is the escape character. set <Home>=^[OH set t_kh=^[OH echo &t_kh noremap <Home> :echoerr "home!"<CR>

Starting with $ vim -u vimrc Vim outputs ^[OH, which is expected. But after I've started Vim the setting seems to be not set:

:set t_kh? E846: Key code not set: t_kh? :verbose set t_kh? E846: Key code not set: t_kh?

And the remapped home key doesn't work. Manually running :set <Home> or :set t_kh fixes the problem; I can now use my custom <Home> mapping.

Why aren't these options taking effect? How can I make them take effect?

I have no plugins and am using Vim 8.0.586 on Arch Linux.

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  • Is something setting 'term' after your vimrc is loaded? Commented May 15, 2017 at 14:46
  • Don't think so @jamessan, :verbose set term? just gives term=xterm-256color without extra information. Also tried without plugins/vimrc, and I get exactly the same results. Commented May 15, 2017 at 14:49
  • You say you have no plugins but do you have anything else? See :scriptnames Commented May 17, 2017 at 8:07
  • It loads the default plugins from ` /usr/share/vim/vim80/plugin/` @laktak, but other than that nothing. Commented May 17, 2017 at 11:03
  • I guess I'm out of ideas - I have the same version on arch but can't replicate your issue. Try a different terminal? I'm using urxvt. Commented May 17, 2017 at 19:40

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I found this in :help xterm-function-keys:

An xterm can send function keys F1 to F4 in two modes: vt100 compatible or not. Because Vim may not know what the xterm is sending, both types of keys are recognized. The same happens for the <Home> and <End> keys. normal vt100 <F1> t_k1 <Esc>[11~ <xF1> <Esc>OP <xF1>-xterm <F2> t_k2 <Esc>[12~ <xF2> <Esc>OQ <xF2>-xterm <F3> t_k3 <Esc>[13~ <xF3> <Esc>OR <xF3>-xterm <F4> t_k4 <Esc>[14~ <xF4> <Esc>OS <xF4>-xterm <Home> t_kh <Esc>[7~ <xHome> <Esc>OH <xHome>-xterm <End> t_@7 <Esc>[4~ <xEnd> <Esc>OF <xEnd>-xterm When Vim starts, <xF1> is mapped to <F1>, <xF2> to <F2> etc. This means that by default both codes do the same thing. If you make a mapping for <xF2>, because your terminal does have two keys, the default mapping is overwritten, thus you can use the <F2> and <xF2> keys for something different.

Setting both <Home> and <xHome> seems to work well! Because we only want this to take effect inside xterm I added a &term check (tmux is screen-256color):

set nocompatible if &term == "xterm-256color" " `^[` is the escape character. set <Home>=^[OH set <xHome>=^[OH endif noremap <Home> :echoerr "home!"<CR>

I'd be lying if I'd say that I fully comprehend all of the above, but it seems to work well without ill effects in my testing.

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