docbook2mdoc: Parsing errors are too easy to miss because they typically

[schwarze@mandoc.bsd.lv]

Log Message:
-----------
Parsing errors are too easy to miss because they typically emit a
one-line error message followed by lengthy formatted output
of what was parsed before the error occurred.

Make parsing errors more conspicious by taking two steps:

1. If there was a parsing error, print a blank line to standard output
before starting formatted output, for better separation.

2. After the formatted output, if there was a parsing error, print
the following to standard error: a blank line, a message that output
is incomplete, and another blank line.

Modified Files:
--------------
    docbook2mdoc:
        main.c

Revision Data
-------------
Index: main.c
===================================================================
RCS file: /home/cvs/mdocml/docbook2mdoc/main.c,v
retrieving revision 1.1
retrieving revision 1.2
diff -Lmain.c -Lmain.c -u -p -r1.1 -r1.2
--- main.c
+++ main.c
@@ -80,9 +80,15 @@ main(int argc, char *argv[])
 	rc = 1;
 	if ((parser = parse_alloc(warn)) != NULL) {
 		if ((tree = parse_file(parser, fd, fname)) != NULL) {
-			if ((tree->flags & TREE_FAIL) == 0)
+			if (tree->flags & TREE_FAIL)
+				fputc('\n', stderr);
+			else
 				rc = 0;
 			ptree_print(tree);
+			if (tree->flags & TREE_FAIL)
+				fputs("\nThe output is incomplete, see "
+				    "the parse error reported above.\n\n",
+				    stderr);
 			pnode_unlink(tree->root);
 			tree->root = NULL;
 		}
--
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