Output json

instance.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"encoding/json"
+	"fmt"
 	"net"
 	"os"
 	"sort"
@@ -54,6 +56,23 @@ func (s instances) printTable() {
 	table.Render()
 }
 
+func (s instances) printJson() {
+	rows := make([]map[string]string, len(s))
+
+	for i := 0; i < len(s); i++ {
+		rows[i] = map[string]string{
+			"name":      s[i].name,
+			"id":        *s[i].InstanceId,
+			"publicIp":  stringify(s[i].PublicIpAddress),
+			"privateIp": *s[i].PrivateIpAddress,
+			"key":       stringify(s[i].KeyName),
+		}
+	}
+
+	bytes, _ := json.MarshalIndent(rows, "", "  ")
+	fmt.Print(string(bytes))
+}
+
 func (s instances) sort() {
 	sort.Sort(s)
 }

main.go

@@ -26,6 +26,7 @@ var (
 	debug   = kingpin.Flag("debug", "Enable debug mode.").Bool()
 	regions = kingpin.Flag("region", "AWS Region to query. Repeat for multiple regions.").Short('r').Default(DEFAULT_REGIONS...).Strings()
 	retries = kingpin.Flag("retries", "Number of times to retry AWS API calls in case of errors.").Default("10").Int()
+	jsonOut = kingpin.Flag("json", "Output json.").Bool()
 )
 
 func init() {
@@ -103,7 +104,11 @@ func main() {
 	// Sort and print instances that were returned to us
 	if len(insts) > 0 {
 		insts.sort()
-		insts.printTable()
+		if *jsonOut {
+			insts.printJson()
+		} else {
+			insts.printTable()
+		}
 	}
 
 	if *debug {