vim script "input()" function that doesn't require user to hit enter

Question

I would like to have the user call my function and then have the function request user input but I do not want the user to have to type 'enter' after typing a letter as is required by the "input()" function. For instance, the user should be able to type single letter commands like 'h','j','k','l' and each letter typed would loop around my function until the user typed 'x' for exit. If I use "input()" then the user would have to type 'h<enter>','j<enter>'...

Any suggestions on how I might be able to do this?

If more clarification is needed please let me know.

UPDATE

Got it working:

function! s:getchar()
  let c = getchar()
  if c =~ '^\d\+$'
    let c = nr2char(c)
  endif
  return c
endfunction

" Interactively change the window size
function! InteractiveWindow()
  let char = "s"
  while char =~ '^\w$'
    echo "(InteractiveWindow) TYPE: h,j,k,l to resize or a for auto resize"
    let char = s:getchar()
    if char == "h" | call SetWindowSize( "incr" ,-5 ,0 ) | endif
    if char == "j" | call SetWindowSize( "incr"  ,0 ,5 ) | endif
    if char == "k" | call SetWindowSize( "incr"  ,0 ,-5) | endif
    if char == "l" | call SetWindowSize( "incr"  ,5 ,0 ) | endif
    if char == "a" | call SetWindowSize( "abs"  ,0  ,0 ) | endif
    redraw
  endwhile
endfunction

I really like the functionality this bit of code provides. It essentially lets you create a new vim mode, for instance you could call the code above a "window-mode" just like visual-mode or insert-mode. Pretty powerful stuff... — stephenmm
– stephenmm, Commented Nov 19, 2010 at 5:16

Kamal · Accepted Answer · 2010-11-15 22:13:43Z

12

getchar()

http://vimdoc.sourceforge.net/htmldoc/eval.html#getchar()

answered Nov 15, 2010 at 22:13

Kamal

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2 Comments

Herbert Sitz Over a year ago

@stephen (and anyone else) -- I'm curious how you're presenting the prompt to the user for input that can be captured with getchar(). Maybe I'm dense but it's not jumping out at me.

stephenmm Over a year ago

I actually haven't implemented it yet (and why I did not mark it as correct yet) but from looking around it seems like getchar will work for me. I am hoping to get a change to implement it later tonight, so I will let you know.

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