===================================================================
RCS file: /cvs/docbook2mdoc/main.c,v
retrieving revision 1.4
retrieving revision 1.6
diff -u -p -r1.4 -r1.6
--- docbook2mdoc/main.c	2019/04/08 22:47:34	1.4
+++ docbook2mdoc/main.c	2019/04/12 19:14:50	1.6
@@ -1,4 +1,4 @@
-/* $Id: main.c,v 1.4 2019/04/08 22:47:34 schwarze Exp $ */
+/* $Id: main.c,v 1.6 2019/04/12 19:14:50 schwarze Exp $ */
 /*
  * Copyright (c) 2014 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2019 Ingo Schwarze <schwarze@openbsd.org>
@@ -28,6 +28,12 @@
  * The steering function of the docbook2mdoc(1) program.
  */
 
+enum	outt {
+	OUTT_MDOC = 0,
+	OUTT_TREE,
+	OUTT_LINT
+};
+
 int
 main(int argc, char *argv[])
 {
@@ -36,6 +42,7 @@ main(int argc, char *argv[])
 	const char	*progname;
 	const char	*fname;
 	int		 ch, fd, rc, warn;
+	enum outt	 outtype;
 
 	if ((progname = strrchr(argv[0], '/')) == NULL)
 		progname = argv[0];
@@ -43,8 +50,22 @@ main(int argc, char *argv[])
 		progname++;
 
 	warn = 0;
-	while ((ch = getopt(argc, argv, "W")) != -1) {
+	outtype = OUTT_MDOC;
+	while ((ch = getopt(argc, argv, "T:W")) != -1) {
 		switch (ch) {
+		case 'T':
+			if (strcmp(optarg, "mdoc") == 0)
+				outtype = OUTT_MDOC;
+			else if (strcmp(optarg, "tree") == 0)
+				outtype = OUTT_TREE;
+			else if (strcmp(optarg, "lint") == 0)
+				outtype = OUTT_LINT;
+			else {
+				fprintf(stderr, "%s: Bad argument\n",
+				    optarg);
+				goto usage;
+			}
+			break;
 		case 'W':
 			warn = 1;
 			break;
@@ -75,18 +96,21 @@ main(int argc, char *argv[])
 
 	if ((parser = parse_alloc(warn)) == NULL) {
 		perror(NULL);
-		return 1;
+		return 6;
 	}
 	tree = parse_file(parser, fd, fname);
-	rc = tree->flags & TREE_FAIL ? 1 : 0;
+	rc = tree->flags & TREE_ERROR ? 3 : tree->flags & TREE_WARN ? 2 : 0;
 
 	/* Format. */
 
-	if (tree->root != NULL) {
-		if (rc)
+	if (outtype != OUTT_LINT && tree->root != NULL) {
+		if (rc > 2)
 			fputc('\n', stderr);
-		ptree_print(tree);
-		if (rc)
+		if (outtype == OUTT_MDOC)
+			ptree_print_mdoc(tree);
+		else
+			ptree_print_tree(tree);
+		if (rc > 2)
 			fputs("\nThe output may be incomplete, see the "
 			    "parse error reported above.\n\n", stderr);
 	}
@@ -94,6 +118,7 @@ main(int argc, char *argv[])
 	return rc;
 
 usage:
-	fprintf(stderr, "usage: %s [-W] [input_filename]\n", progname);
-	return 1;
+	fprintf(stderr, "usage: %s [-W] [-T mdoc | tree | lint] "
+	    "[input_filename]\n", progname);
+	return 5;
 }