PRO dustem_write_spin,dir,st

;Writes ALL needed CHRG_xxx.DAT files in temporary dustem directory

IF ptr_valid(st[0]) THEN BEGIN
  comments=(*st[0]).comments
  Ncomments=n_elements(comments)
ENDIF ELSE BEGIN
  Ncomments=0L
ENDELSE
  
Nst=n_elements(st)
  
;stop
  
;  frmts=[ $
;         '(F8.5,F8.5,F8.5,F8.5,E8.5,E8.5,F8.5)', $
;         '(F8.5,F8.5,F8.5,F8.5,F8.5,F8.5)', $
;         '(F8.5,F8.5,F8.5,F8.5,F8.5)', $
;         '(F8.5,F8.5,F8.5,F8.5,F8.5)', $
;         '(F8.5)']

frmts=[ $
         '(A)', $
         '(A)', $
         '(A)', $
         '(A)', $
         '(A)']

;Start loop over type of grain
FOR i=0L,Nst-1 DO BEGIN
  ;Test if the pointer is pointing to something
  IF ptr_valid(st[i]) THEN BEGIN
      ;Get filename
      ffile=(*st[i]).file
      fv=str_sep(ffile,'/')
      file=dir+fv(n_elements(fv)-1)
      ;Open file
      message,'Will write SPIN file '+file,/continue
      openw,unit,file,/get_lun
      ;Print comments
      IF Ncomments NE 0 THEN BEGIN
        FOR ii=0,Ncomments-1 DO BEGIN
          printf,unit,comments[ii]
        ENDFOR
      ENDIF
      ;Print data
      FOR k=0L,n_elements((*st[i]).fspin)-1 DO BEGIN
        printf,unit,((*st[i]).fspin)[k],format=frmts[k]
      ENDFOR
      close,unit
      free_lun,unit
  ENDIF ELSE BEGIN
    ;left blank intentionally
  ENDELSE
ENDFOR

END