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In my Vim configuration, I have mapped the <C-j> key to <cmd>bn<CR>, but because the C-j key corresponds to the null character in Vim, this causes some strange issues when defining macros. For instance, if I define a macro for q with

qq<CR>q

the macro executes the keystroke <CR>, as expected. But if I try to define @q directly with the keystrokes,

:let @q='^M'<CR>

where ^M is the literal newline character, executing q with @q behaves like <CR><C-j>. And indeed, checking :reg shows that "q=^M^J when defined directly, and "q=^M when defined via macro recording. It seems like this extra null character is only appended when the string ends in a carriage return.

I would like to be able to define "q directly without this terminating null character. My solution for now has been to replace ^M$ with ^M^[. While this works for virtually all cases, it's not perfect (for instance, if the macro ends in the middle of a chord, the <nop> would exit the chord).

Why does assignment and macro recording differ in this way? And is there a way to perform assign a register without this terminating null character?

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  • I can reproduce the problem on Windows. Commented Aug 13, 2022 at 21:35

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I believe the reason is that when you set the register using the let @q= syntax, if it ends with ^M or ^J (<CR> or <NL>) the register is considered line wise (instead of character wise) and and ^J is added at its end.

see :help :let-@

If you want to programmatically set register q to ^M you can do:

setreg('q', '^M', 'c')
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    setreg works! Thank you!
    – Andy Wang
    Commented Aug 14, 2022 at 2:55

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