How to pass variables as arguments of a function in a vim script

Question

I am trying to pass some global variables to a function in a vim script. However, I end up receiving the variable names, not the actual variable values once they are passed to the function. Here is a simple case:

let g:my_var_a = "melon"
let g:my_var_b = "apple"

" Define the main function
function! MyFunc(myarg1, myarg2)
    echom "Arguments: " . a:myarg1 . ", " . a:myarg2
endfunction

" Link the function to a command
command! -nargs=* HookMyFunc call MyFunc(<f-args>)

" Link the command to a plug
nnoremap <unique> <Plug>MyHook :HookMyFunc g:my_var_a g:my_var_b<CR>

" Assign a key to the plug
nmap <silent> <leader>z <Plug>MyHook

So, if I do this: nnoremap <unique> <Plug>MyHook :HookMyFunc melon apple<CR>

I get the output of: Arguments: melon apple

and when I do this: nnoremap <unique> <Plug>MyHook :HookMyFunc g:my_var_a g:my_var_b<CR>

my output is Arguments: g:my_var_a g:my_var_b

What is the way to evaluate those variables as they are passed to the function?

Peter Rincker · Accepted Answer · 2015-04-15 23:00:58Z

5

You need to evaluate the line with :execute so it will become:

nnoremap <unique> <Plug>MyHook :execute 'HookMyFunc ' . g:my_var_a . ' ' . g:my_var_b<CR>

Think of this as building up a string and then evaluating(/executing) it.

For more help see: :h :exe

answered Apr 15, 2015 at 23:00

Peter Rincker

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