🚀 go-pugleaf

Here is a patch to GNU indent 1.7 that gives it a more helpful usage
message, though still not in the league of GNU tar.  It also now gives
the usage message if you hand it an invalid option.


*** diff.c.prev	Sun Jul 23 00:22:07 1989
--- diff.c	Sun Jul 23 00:24:08 1989
***************
*** 271,288 ****
  	  ignore_all_space_flag = 1;
  	  length_varies = 1;
  	  break;
  	}
        prev = c;
      }
  
    if (optind != argc - 2)
!     fatal ("requires two file names.  Usage: diff [-options] file1 file2");
! 
!   /*
!    * @@ need more complicated usage string for directory options??
!    * Note three liner at top of BSD documentation, and John Gilmore
!    * message in his public domain tar being used by GNU.  
!    */
  
    if (ignore_regexp)
      {
--- 271,285 ----
  	  ignore_all_space_flag = 1;
  	  length_varies = 1;
  	  break;
+ 
+ 	default:
+ 	  usage ();
  	}
        prev = c;
      }
  
    if (optind != argc - 2)
!     usage ();
  
    if (ignore_regexp)
      {
***************
*** 321,326 ****
--- 318,332 ----
  
    exit (val);
  }
+ 
+ usage ()
+ {
+   fprintf (stderr,
+     "Usage: diff [-#] [-abBcdefhHilnNprstTw]\n");
+   fprintf (stderr,
+     "            [-C lines] [-F regexp] [-I regexp] [-S file] path1 path2\n");
+   exit (1);
+ } 
  
  specify_style (style)
       enum output_style style;