;+
; NAME: 
;  isfile
; PURPOSE: 
;  Check if a file exists
; DESCRIPTION:
; CATEGORY:
;  fileio 
; CALLING SEQUENCE:
;  exists = IsFile(fn)
; INPUTS:
;  fn: the filename
; OPTIONAL INPUT PARAMETERS:
; KEYWORD INPUT PARAMETERS:
; OUTPUTS:
;  exists (boolean): true if file exists
; KEYWORD OUTPUT PARAMETERS:
; COMMON BLOCKS:
; SIDE EFFECTS:
; RESTRICTIONS:
; PROCEDURE:
;  call findfile
; MODIFICATION HISTORY:
;  2002/05/30 - Initial  version written, Leslie Young SwRI
;  2011/10/20 - Protect against fn=' '
;-
function isfile, fn
    
    if n_elements(fn) eq 1 then begin
   
        res = findfile(fn, count = count)
        return, (count gt 0) and (strtrim(fn,2) ne '')
    endif else begin
        n = n_elements(fn)
        out = (strtrim(fn,2) ne '') ; to get the right size and protect against ''
        for i = 0, n-1 do out[i] = isfile(fn[i]) and out[i]
        return, out
    endelse
end

pro isfileTEST

  fn = 'isfile.pro'
  print, fn, IsFile(fn)
  fn = 'NoSuchFile'
  print, fn, IsFile(fn)
  
end