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Based on v:count help I define:

:map _x :<C-U>echo "the count is " . v:count . ' and count1 is ' . v:count1<CR>

So

_x
the count is 0 and count1 is 1
0_x
the count is 0 and count1 is 1
1_x
the count is 1 and count1 is 1
3_x
the count is 3 and count1 is 3

My goal is detect when map do not get count at all, but v:count always get a 0 value.

Is there any chance to detect that?

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3
  • It might be better at this stage to create a separate, new question asking specifically about the counts passed to user-defined ex commands. The existing answer is correct for the original question you asked (which gave the example of a normal-mode map), and some might consider it unsporting to change the parameters at this point. (Not meaning to imply that you did anything wrong originally: I understand it's not necessarily obvious that normal-mode and command-line mode counts would behave differently.) – Rich Mar 12 '18 at 16:38
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    I create a wrong use case then vimdoc.sourceforge.net/htmldoc/map.html (Search for special case). Let's accept the answer – albfan Mar 13 '18 at 12:22
  • Accepting the answer looks good to me! (In case it's not clear, that bit of the documentation is explaining how you can do something like nnoremap 0 dd but then still use a normal-mode command with a count such as 20j without triggering your mapping when you type the 0 in 20.) – Rich Mar 13 '18 at 12:31
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0 is not a valid count. 0_x does not mean give a count of 0 to command _x, it means go to the first column of the line, then run command _x. You cannot give 0 as a count.

Hence, v:count == 0 means no count is provided. Some commands interpret count 0 as equivalent to 1. For this reason, a shortcut v:count1 is also provided which is the same as v:count except when no count is given, in which case v:count == 1. You cannot use v:count1 alone to determine when no count is provided.

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    It defaults to -count=0 because 0 is used as the "no count provided" value. Normal mode commands can never receive a count of 0. – tommcdo Mar 12 '18 at 14:23
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    @albfan I think there is some confusion between ex commands like :Search and normal mode commands like _x. They both have something called a "count" but they are not the same thing at all. – Mass Mar 12 '18 at 16:02

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