Add -json flag to publish list|show

Signed-off-by: Joshua Colson <joshua.colson@gmail.com>

cmd/publish_show.go

@@ -1,6 +1,7 @@
 package cmd
 
 import (
+	"encoding/json"
 	"fmt"
 	"strings"
 
@@ -9,12 +10,23 @@ import (
 )
 
 func aptlyPublishShow(cmd *commander.Command, args []string) error {
-	var err error
 	if len(args) < 1 || len(args) > 2 {
 		cmd.Usage()
 		return commander.ErrCommandError
 	}
 
+	jsonFlag := cmd.Flag.Lookup("json").Value.Get().(bool)
+
+	if jsonFlag {
+		return aptlyPublishShowJson(cmd, args)
+	}
+
+	return aptlyPublishShowTxt(cmd, args)
+}
+
+func aptlyPublishShowTxt(cmd *commander.Command, args []string) error {
+	var err error
+
 	distribution := args[0]
 	param := "."
 
@@ -63,6 +75,36 @@ func aptlyPublishShow(cmd *commander.Command, args []string) error {
 	return err
 }
 
+func aptlyPublishShowJson(cmd *commander.Command, args []string) error {
+	var err error
+
+	distribution := args[0]
+	param := "."
+
+	if len(args) == 2 {
+		param = args[1]
+	}
+
+	storage, prefix := deb.ParsePrefix(param)
+
+	repo, err := context.CollectionFactory().PublishedRepoCollection().ByStoragePrefixDistribution(storage, prefix, distribution)
+	if err != nil {
+		return fmt.Errorf("unable to show: %s", err)
+	}
+
+	err = context.CollectionFactory().PublishedRepoCollection().LoadComplete(repo, context.CollectionFactory())
+	if err != nil {
+		return err
+	}
+
+	var output []byte
+	if output, err = json.MarshalIndent(repo, "", "  "); err == nil {
+		fmt.Println(string(output))
+	}
+
+	return err
+}
+
 func makeCmdPublishShow() *commander.Command {
 	cmd := &commander.Command{
 		Run:       aptlyPublishShow,
@@ -77,5 +119,7 @@ Example:
 `,
 	}
 
+	cmd.Flag.Bool("json", false, "display record in JSON format")
+
 	return cmd
 }