;
; Read macro definition
;
IF debug_w THEN print, '   ENTER get_macro_def...'

; name of macro file
   file_mac = hom_def+'fld_macros.def'
   IF debug_w THEN print,  '    var_name in get_macro_def: ', var_name 
; 
; special case for stddev monthly 
   stddev_mth =  '00'
   pos_underscore =  strpos(var_name,'_')
   IF pos_underscore GE 0 THEN BEGIN
      stddev_mth = STRMID(var_name, pos_underscore + 1, 2)
      var_name = STRMID(var_name, 0, pos_underscore)
   ENDIF

; find definition of macro
   spawn, 'grep -i " '+STRMID(var_name, 2, 16)+' " '+file_mac, line
   line = strcompress(strtrim(line[0], 2))
   length = strlen(line)
   IF debug_w THEN print,  '    line: ', line 

   IF length EQ 0 THEN BEGIN
      print, ' *** WARNING : No macro definition for field ', var_name, $
       ' in file ', file_mac
      stop
   ENDIF


; Separate macro def and legend+unit
;
   leg_pos = strpos(line,'<')
   line_def = STRMID(line,0,leg_pos)
   line_def = strcompress(strtrim(line_def[0], 2))
   macro_def = str_sep(line_def, ' ')
   nfields = n_elements(macro_def)
;
; extract legend and unit
;
   legend = extract_str(line, '<', '>')
   unit = extract_str(line, '[', ']')

IF debug_w THEN print, '   EXIT get_macro_def...'