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Make mapping that accepts count independent of line count

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1

I have a mapping that looks like this:

nnoremap <expr> <c-x>b ":call MyFunction(" . v:count . ")<cr>"

I also tried to instead define function with range, but the effect is the same.

The point is to be able to press a number, followed by the mapping, e.g. 30<c-x>b. The problem is, it fails if the number of remaining lines in the file is less than count I input. The function actually don't do any line operations, so I don't care about actual number of lines. How can I make a mapping or a function that accepts count and isn't dependent on number of lines in open file?

key-bindings functions count

share|improve this question

asked 8 hours ago

ThunderbeefThunderbeef

19011 silver badge88 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Couldnt you just use v:count in MyFunction, and not go through the expr hoops?
  
  – D. Ben Knoble
  3 hours ago
  

  
  
  
  

add a comment
 | 

1

I have a mapping that looks like this:

nnoremap <expr> <c-x>b ":call MyFunction(" . v:count . ")<cr>"

I also tried to instead define function with range, but the effect is the same.

The point is to be able to press a number, followed by the mapping, e.g. 30<c-x>b. The problem is, it fails if the number of remaining lines in the file is less than count I input. The function actually don't do any line operations, so I don't care about actual number of lines. How can I make a mapping or a function that accepts count and isn't dependent on number of lines in open file?

key-bindings functions count

share|improve this question

asked 8 hours ago

ThunderbeefThunderbeef

19011 silver badge88 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Couldnt you just use v:count in MyFunction, and not go through the expr hoops?
  
  – D. Ben Knoble
  3 hours ago
  

  
  
  
  

add a comment
 | 

I have a mapping that looks like this:

nnoremap <expr> <c-x>b ":call MyFunction(" . v:count . ")<cr>"

I also tried to instead define function with range, but the effect is the same.

The point is to be able to press a number, followed by the mapping, e.g. 30<c-x>b. The problem is, it fails if the number of remaining lines in the file is less than count I input. The function actually don't do any line operations, so I don't care about actual number of lines. How can I make a mapping or a function that accepts count and isn't dependent on number of lines in open file?

key-bindings functions count

share|improve this question

asked 8 hours ago

ThunderbeefThunderbeef

19011 silver badge88 bronze badges

nnoremap <expr> <c-x>b ":call MyFunction(" . v:count . ")<cr>"

share|improve this question

asked 8 hours ago

ThunderbeefThunderbeef

19011 silver badge88 bronze badges

share|improve this question

asked 8 hours ago

ThunderbeefThunderbeef

19011 silver badge88 bronze badges

asked 8 hours ago

ThunderbeefThunderbeef

19011 silver badge88 bronze badges

asked 8 hours ago

ThunderbeefThunderbeef

19011 silver badge88 bronze badges

1 Answer
1

active

oldest

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4

The answer is actually not as complicated as you might think. A trick that I have found very useful in situations similar to this is to remove the <cr> from the end of your mapping and see what comes up. If I do that and run 30<C-x>b, this pops up in the command line:

:.,.+29call MyFunction(30)

This is because it's basically like you typed 30:call MyFunction(30), and putting a count before : will always insert a range. (Try it!)

To fix this, you just use <C-u> to clear the command line before typing in "call MyFunction(30)"

nnoremap <expr> <c-x>b ":<C-u>call MyFunction(" . v:count . ")<cr>"

From :h c_<C-u>

 *c_CTRL-U*
CTRL-U Remove all characters between the cursor position and
 the beginning of the line. Previous versions of vim
 deleted all characters on the line. If that is the
 preferred behavior, add the following to your .vimrc: >
 :cnoremap <C-U> <C-E><C-U>

share|improve this answer

edited 8 hours ago

answered 8 hours ago

DJMcMayhem♦DJMcMayhem

12.1k33 gold badges3131 silver badges6767 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It is worth mentioning that without <C-U> call MyFunction(30) (unless it has range attribute) will be executed 30 times in a row. So in most cases <C-U> is a must.
  
  – Matt
  8 hours ago
  
  

  
  
  
  

add a comment
 | 

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4

The answer is actually not as complicated as you might think. A trick that I have found very useful in situations similar to this is to remove the <cr> from the end of your mapping and see what comes up. If I do that and run 30<C-x>b, this pops up in the command line:

:.,.+29call MyFunction(30)

This is because it's basically like you typed 30:call MyFunction(30), and putting a count before : will always insert a range. (Try it!)

To fix this, you just use <C-u> to clear the command line before typing in "call MyFunction(30)"

nnoremap <expr> <c-x>b ":<C-u>call MyFunction(" . v:count . ")<cr>"

From :h c_<C-u>

 *c_CTRL-U*
CTRL-U Remove all characters between the cursor position and
 the beginning of the line. Previous versions of vim
 deleted all characters on the line. If that is the
 preferred behavior, add the following to your .vimrc: >
 :cnoremap <C-U> <C-E><C-U>

share|improve this answer

edited 8 hours ago

answered 8 hours ago

DJMcMayhem♦DJMcMayhem

12.1k33 gold badges3131 silver badges6767 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It is worth mentioning that without <C-U> call MyFunction(30) (unless it has range attribute) will be executed 30 times in a row. So in most cases <C-U> is a must.
  
  – Matt
  8 hours ago
  
  

  
  
  
  

add a comment
 | 

4

The answer is actually not as complicated as you might think. A trick that I have found very useful in situations similar to this is to remove the <cr> from the end of your mapping and see what comes up. If I do that and run 30<C-x>b, this pops up in the command line:

:.,.+29call MyFunction(30)

This is because it's basically like you typed 30:call MyFunction(30), and putting a count before : will always insert a range. (Try it!)

To fix this, you just use <C-u> to clear the command line before typing in "call MyFunction(30)"

nnoremap <expr> <c-x>b ":<C-u>call MyFunction(" . v:count . ")<cr>"

From :h c_<C-u>

 *c_CTRL-U*
CTRL-U Remove all characters between the cursor position and
 the beginning of the line. Previous versions of vim
 deleted all characters on the line. If that is the
 preferred behavior, add the following to your .vimrc: >
 :cnoremap <C-U> <C-E><C-U>

share|improve this answer

edited 8 hours ago

answered 8 hours ago

DJMcMayhem♦DJMcMayhem

12.1k33 gold badges3131 silver badges6767 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It is worth mentioning that without <C-U> call MyFunction(30) (unless it has range attribute) will be executed 30 times in a row. So in most cases <C-U> is a must.
  
  – Matt
  8 hours ago
  
  

  
  
  
  

add a comment
 | 

The answer is actually not as complicated as you might think. A trick that I have found very useful in situations similar to this is to remove the <cr> from the end of your mapping and see what comes up. If I do that and run 30<C-x>b, this pops up in the command line:

:.,.+29call MyFunction(30)

This is because it's basically like you typed 30:call MyFunction(30), and putting a count before : will always insert a range. (Try it!)

To fix this, you just use <C-u> to clear the command line before typing in "call MyFunction(30)"

nnoremap <expr> <c-x>b ":<C-u>call MyFunction(" . v:count . ")<cr>"

From :h c_<C-u>

 *c_CTRL-U*
CTRL-U Remove all characters between the cursor position and
 the beginning of the line. Previous versions of vim
 deleted all characters on the line. If that is the
 preferred behavior, add the following to your .vimrc: >
 :cnoremap <C-U> <C-E><C-U>

share|improve this answer

edited 8 hours ago

answered 8 hours ago

DJMcMayhem♦DJMcMayhem

12.1k33 gold badges3131 silver badges6767 bronze badges

:.,.+29call MyFunction(30)

nnoremap <expr> <c-x>b ":<C-u>call MyFunction(" . v:count . ")<cr>"

 *c_CTRL-U*
CTRL-U Remove all characters between the cursor position and
 the beginning of the line. Previous versions of vim
 deleted all characters on the line. If that is the
 preferred behavior, add the following to your .vimrc: >
 :cnoremap <C-U> <C-E><C-U>

share|improve this answer

edited 8 hours ago

answered 8 hours ago

DJMcMayhem♦DJMcMayhem

12.1k33 gold badges3131 silver badges6767 bronze badges

answered 8 hours ago

DJMcMayhem♦DJMcMayhem

12.1k33 gold badges3131 silver badges6767 bronze badges

answered 8 hours ago

DJMcMayhem♦DJMcMayhem

12.1k33 gold badges3131 silver badges6767 bronze badges