CODEWITHSUNDEEP
vim
schomper
schomper

Reputation: 11

Vim: How do I see whether a command is switched on?

I want to implement a function that cycles through setting the line numbers.

I'm having trouble evaluating the state of the number command. For instance I have tried:

function! CycleNumbers()
    if exists(":number")
        set nonumber
    elseif exists(":nonumber")
        set number
    endif
endfunction

Is there a way to test for number being off? Something like number==off?

Thank you for your help

Upvotes: 0

Views: 47

Answers (2)

René Nyffenegger
René Nyffenegger

Reputation: 40499

You can toggle an option with the exclamation mark (on the command line):

:set number!

See also :help set-!

If you insist on having a function, then you want something like

fu! CycleNumbers()

    set number!

endfu

Edit

If you want to query the current value of the option, you use the &option syntax:

if &number == 0
   ... 
else
   ...
endif

Upvotes: 3

Kent
Kent

Reputation: 195059

why not check the option value? something like :

let &number = &number? 0: 1

or simply as you said in comment, set nu!

to get the information, if line number is shown, read &number variable. if it's 1 the number is currently showing. 0, not.

something like:

if &number
   "showing
else
   "not showing
endif

fill your logic codes there.

Upvotes: 4

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