cmd/resolver: implement command to delete record on hosts file

The command has the following signature,

      resolver hosts.d rr delete <name> <domain>

Given the hosts name "hosts" and domain "my.hosts" it will delete
all records that have domain name "my.hosts" inside the file.

2 files changed, 33 insertions, 0 deletions

diff --git a/cmd/resolver/main.go b/cmd/resolver/main.go
index 2c40b90..fac894c 100644
--- a/cmd/resolver/main.go
+++ b/cmd/resolver/main.go
@@ -206,6 +206,10 @@ hosts.d rr add <name> <domain> <value>
 	If the domain name already exists, the new record will be appended
 	instead of replaced.
 
+hosts.d rr delete <name> <domain>
+
+	Delete record from hosts file "name" by domain name.
+
 
 ==  Examples
 
@@ -299,5 +303,16 @@ Add new record "127.0.0.1 my.hosts" to hosts file named "hosts",
 	  "Type": 1,
 	  "Class": 1,
 	  "TTL": 604800
+	}
+
+Delete record "my.hosts" from hosts file "hosts",
+
+	$ resolver hosts.d rr delete hosts my.hosts
+	{
+	  "Value": "127.0.0.1",
+	  "Name": "my.hosts",
+	  "Type": 1,
+	  "Class": 1,
+	  "TTL": 604800
 	}`)
 }
diff --git a/cmd/resolver/resolver.go b/cmd/resolver/resolver.go
index 62ce953..792f8d9 100644
--- a/cmd/resolver/resolver.go
+++ b/cmd/resolver/resolver.go
@@ -362,6 +362,24 @@ func (rsol *resolver) doCmdHostsdRecord(args []string) {
 		fmt.Println(string(jsonb))
 
 	case subCmdDelete:
+		args = args[1:]
+		if len(args) <= 1 {
+			log.Fatalf("resolver: %s %s: missing arguments", rsol.cmd, subCmd)
+		}
+
+		resc = rsol.newRescachedClient()
+		record, err = resc.HostsdRecordDelete(args[0], args[1])
+		if err != nil {
+			log.Fatalf("resolver: %s", err)
+		}
+
+		jsonb, err = json.MarshalIndent(record, "", "  ")
+		if err != nil {
+			log.Fatalf("resolver: %s", err)
+		}
+
+		fmt.Println(string(jsonb))
+
 	default:
 		log.Fatalf("resolver: %s %s: unknown command %s", rsol.cmd, subCmdRR, subCmd)
 	}