bridge: implement json pretty print flag

Make bridge work like other iproute2 commands and accept
same json and pretty flags.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David Ahern <dsahern@gmail.com>

bridge/br_common.h

@@ -26,5 +26,5 @@ extern int show_stats;
 extern int show_details;
 extern int timestamp;
 extern int compress_vlans;
-extern int json_output;
+extern int json;
 extern struct rtnl_handle rth;

bridge/bridge.c

@@ -23,7 +23,7 @@ int oneline;
 int show_stats;
 int show_details;
 int compress_vlans;
-int json_output;
+int json;
 int timestamp;
 char *batch_file;
 int force;
@@ -39,7 +39,7 @@ static void usage(void)
 "where	OBJECT := { link | fdb | mdb | vlan | monitor }\n"
 "	OPTIONS := { -V[ersion] | -s[tatistics] | -d[etails] |\n"
 "		     -o[neline] | -t[imestamp] | -n[etns] name |\n"
-"		     -c[ompressvlans] -j{son} }\n");
+"		     -c[ompressvlans] -p[retty] -j{son} }\n");
 	exit(-1);
 }
 
@@ -175,7 +175,9 @@ main(int argc, char **argv)
 		} else if (matches(opt, "-force") == 0) {
 			++force;
 		} else if (matches(opt, "-json") == 0) {
-			++json_output;
+			++json;
+		} else if (matches(opt, "-pretty") == 0) {
+			++pretty;
 		} else if (matches(opt, "-batch") == 0) {
 			argc--;
 			argv++;

bridge/fdb.c

@@ -132,10 +132,8 @@ int print_fdb(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
 	if (filter_vlan && filter_vlan != vid)
 		return 0;
 
-	if (jw_global) {
+	if (jw_global)
-		jsonw_pretty(jw_global, 1);
 		jsonw_start_object(jw_global);
-	}
 
 	if (n->nlmsg_type == RTM_DELNEIGH) {
 		if (jw_global)
@@ -388,14 +386,18 @@ static int fdb_show(int argc, char **argv)
 		exit(1);
 	}
 
-	if (json_output) {
+	if (json) {
 		jw_global = jsonw_new(stdout);
 		if (!jw_global) {
 			fprintf(stderr, "Error allocation json object\n");
 			exit(1);
 		}
+		if (pretty)
+			jsonw_pretty(jw_global, 1);
+
 		jsonw_start_array(jw_global);
 	}
+
 	if (rtnl_dump_filter(&rth, print_fdb, stdout) < 0) {
 		fprintf(stderr, "Dump terminated\n");
 		exit(1);

bridge/mdb.c

@@ -325,7 +325,7 @@ static int mdb_show(int argc, char **argv)
 		return -1;
 	}
 
-	if (!json_output) {
+	if (!json) {
 		/* Normal output */
 		if (rtnl_dump_filter(&rth, print_mdb, stdout) < 0) {
 			fprintf(stderr, "Dump terminated\n");
@@ -333,9 +333,17 @@ static int mdb_show(int argc, char **argv)
 		}
 		return 0;
 	}
+
 	/* Json output */
 	jw_global = jsonw_new(stdout);
-	jsonw_pretty(jw_global, 1);
+	if (!jw_global) {
+		fprintf(stderr, "Error allocation json object\n");
+		exit(1);
+	}
+
+	if (pretty)
+		jsonw_pretty(jw_global, 1);
+
 	jsonw_start_object(jw_global);
 	jsonw_name(jw_global, "mdb");
 	jsonw_start_array(jw_global);

bridge/vlan.c

@@ -258,7 +258,6 @@ static int filter_vlan_check(__u16 vid, __u16 flags)
 static void print_vlan_port(FILE *fp, int ifi_index)
 {
 	if (jw_global) {
-		jsonw_pretty(jw_global, 1);
 		jsonw_name(jw_global,
 			   ll_index_to_name(ifi_index));
 		jsonw_start_array(jw_global);
@@ -578,17 +577,21 @@ static int vlan_show(int argc, char **argv)
 	if (!show_stats) {
 		if (rtnl_wilddump_req_filter(&rth, PF_BRIDGE, RTM_GETLINK,
 					     (compress_vlans ?
-						RTEXT_FILTER_BRVLAN_COMPRESSED :
+					      RTEXT_FILTER_BRVLAN_COMPRESSED :
-						RTEXT_FILTER_BRVLAN)) < 0) {
+					      RTEXT_FILTER_BRVLAN)) < 0) {
 			perror("Cannont send dump request");
 			exit(1);
 		}
-		if (json_output) {
+
+		if (json) {
 			jw_global = jsonw_new(stdout);
 			if (!jw_global) {
 				fprintf(stderr, "Error allocation json object\n");
 				exit(1);
 			}
+			if (pretty)
+				jsonw_pretty(jw_global, 1);
+
 			jsonw_start_object(jw_global);
 		} else {
 			if (show_vlan_tunnel_info)

man/man8/bridge.8

@@ -22,6 +22,7 @@ bridge \- show / manipulate bridge addresses and devices
 \fB\-s\fR[\fItatistics\fR] |
 \fB\-n\fR[\fIetns\fR] name |
 \fB\-b\fR[\fIatch\fR] filename |
+\fB\-p\fR[\fIretty\fR] |
 \fB\-j\fR[\fIson\fR] }
 
 .ti -8
@@ -171,6 +172,11 @@ return code will be non zero.
 .BR "\-json"
 Display results in JSON format. Currently available for vlan and fdb.
 
+.TP
+.BR "\-pretty"
+When combined with -j generate a pretty JSON output.
+
+
 .SH BRIDGE - COMMAND SYNTAX
 
 .SS