Refactoring console printing style, supports --json even for error messages now - fixes #418

cmd-access.go

@@ -17,6 +17,7 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"time"
 
@@ -31,42 +32,51 @@ func runAccessCmd(ctx *cli.Context) {
 		cli.ShowCommandHelpAndExit(ctx, "access", 1) // last argument is exit code
 	}
 	if !isMcConfigExist() {
-		console.Fatalln("\"mc\" is not configured.  Please run \"mc config generate\".")
+		console.Fatalln(console.ErrorMessage{
+			Message: "Please run \"mc config generate\"",
+			Error:   iodine.New(errors.New("\"mc\" is not configured"), nil),
+		})
 	}
 	config, err := getMcConfig()
 	if err != nil {
-		console.Fatalf("loading config file failed with following reason: [%s]\n", iodine.ToError(err))
+		console.Fatalln(console.ErrorMessage{
+			Message: "loading config file failed",
+			Error:   iodine.New(err, nil),
+		})
 	}
 	targetURLConfigMap := make(map[string]*hostConfig)
 	targetURLs, err := getExpandedURLs(ctx.Args(), config.Aliases)
 	if err != nil {
-		switch e := iodine.ToError(err).(type) {
+		console.Fatalln(console.ErrorMessage{
-		case errUnsupportedScheme:
+			Message: "Unknown type of URL ",
-			console.Fatalf("Unknown type of URL ‘%s’. Reason: %s.\n", e.url, e)
+			Error:   iodine.New(err, nil),
-		default:
+		})
-			console.Fatalf("reading URLs failed with following Reason: %s\n", e)
-		}
 	}
 	acl := bucketACL(ctx.Args().First())
 	if !acl.isValidBucketACL() {
-		console.Fatalf("Access type ‘%s’ is not supported. Valid types are [private, public, readonly].\n", acl)
+		console.Fatalln(console.ErrorMessage{
+			Message: "Valid types are [private, public, readonly].",
+			Error:   iodine.New(errors.New("Invalid ACL Type ‘"+acl.String()+"’"), nil),
+		})
 	}
 	targetURLs = targetURLs[1:] // 1 or more target URLs
 	for _, targetURL := range targetURLs {
 		targetConfig, err := getHostConfig(targetURL)
 		if err != nil {
-			console.Fatalf("Unable to read configuration for host ‘%s’. Reason: %s.\n", targetURL, iodine.ToError(err))
+			console.Fatalln(console.ErrorMessage{
+				Message: "Unable to read configuration for host " + "‘" + targetURL + "’",
+				Error:   iodine.New(err, nil),
+			})
 		}
 		targetURLConfigMap[targetURL] = targetConfig
 	}
 	for targetURL, targetConfig := range targetURLConfigMap {
 		errorMsg, err := doUpdateAccessCmd(targetURL, acl.String(), targetConfig)
-		err = iodine.New(err, nil)
 		if err != nil {
-			if errorMsg == "" {
+			console.Errorln(console.ErrorMessage{
-				errorMsg = "Empty error message.  Please rerun this command with --debug and file a bug report."
+				Message: errorMsg,
-			}
+				Error:   iodine.New(err, nil),
-			console.Errorf("%s", errorMsg)
+			})
 		}
 	}
 }
@@ -76,10 +86,8 @@ func doUpdateAccessCmd(targetURL, targetACL string, targetConfig *hostConfig) (s
 	var clnt client.Client
 	clnt, err = getNewClient(targetURL, targetConfig)
 	if err != nil {
-		err := iodine.New(err, nil)
+		msg := fmt.Sprintf("Unable to initialize client for ‘%s’", targetURL)
-		msg := fmt.Sprintf("Unable to initialize client for ‘%s’. Reason: %s.\n",
+		return msg, iodine.New(err, nil)
-			targetURL, iodine.ToError(err))
-		return msg, err
 	}
 	return doUpdateAccess(clnt, targetURL, targetACL)
 }
@@ -87,15 +95,14 @@ func doUpdateAccessCmd(targetURL, targetACL string, targetConfig *hostConfig) (s
 func doUpdateAccess(clnt client.Client, targetURL, targetACL string) (string, error) {
 	err := clnt.SetBucketACL(targetACL)
 	for i := 0; i < globalMaxRetryFlag && err != nil && isValidRetry(err); i++ {
-		fmt.Println(console.Retry("Retrying ... %d", i))
+		console.Retry("Retrying ...", i)
 		// Progressively longer delays
 		time.Sleep(time.Duration(i*i) * time.Second)
 		err = clnt.SetBucketACL(targetACL)
 	}
 	if err != nil {
-		err := iodine.New(err, nil)
+		msg := fmt.Sprintf("Failed to add bucket access policy for URL ‘%s’", targetURL)
-		msg := fmt.Sprintf("Failed to add bucket access policy for URL ‘%s’. Reason: %s.\n", targetURL, iodine.ToError(err))
+		return msg, iodine.New(err, nil)
-		return msg, err
 	}
 	return "", nil
 }

cmd-cat.go

@@ -18,6 +18,7 @@ package main
 
 import (
 	"errors"
+	"fmt"
 	"io"
 	"os"
 
@@ -31,33 +32,42 @@ func runCatCmd(ctx *cli.Context) {
 		cli.ShowCommandHelpAndExit(ctx, "cat", 1) // last argument is exit code
 	}
 	if !isMcConfigExist() {
-		console.Fatalln("\"mc\" is not configured.  Please run \"mc config generate\".")
+		console.Fatalln(console.ErrorMessage{
+			Message: "Please run \"mc config generate\"",
+			Error:   iodine.New(errors.New("\"mc\" is not configured"), nil),
+		})
 	}
 	config, err := getMcConfig()
 	if err != nil {
-		console.Fatalf("Unable to read config file ‘%s’. Reason: %s.\n", mustGetMcConfigPath(), iodine.ToError(err))
+		console.Fatalln(console.ErrorMessage{
+			Message: fmt.Sprintf("Unable to read config file ‘%s’", mustGetMcConfigPath()),
+			Error:   iodine.New(err, nil),
+		})
 	}
 
 	// Convert arguments to URLs: expand alias, fix format...
 	urls, err := getExpandedURLs(ctx.Args(), config.Aliases)
 	if err != nil {
-		switch e := iodine.ToError(err).(type) {
+		console.Fatalln(console.ErrorMessage{
-		case errUnsupportedScheme:
+			Message: fmt.Sprintf("Unknown type of URL ‘%s’", urls),
-			console.Fatalf("Unknown type of URL ‘%s’. Reason: %s.\n", e.url, e)
+			Error:   iodine.New(err, nil),
-		default:
+		})
-			console.Fatalf("Unable to parse arguments. Reason: %s.\n", iodine.ToError(err))
-		}
 	}
 
 	sourceURLs := urls
 	sourceURLConfigMap, err := getHostConfigs(sourceURLs)
 	if err != nil {
-		console.Fatalf("Unable to read host configuration for ‘%s’ from config file ‘%s’. Reason: %s.\n",
+		console.Fatalln(console.ErrorMessage{
-			sourceURLs, mustGetMcConfigPath(), iodine.ToError(err))
+			Message: fmt.Sprintf("Unable to read host configuration for ‘%s’ from config file ‘%s’", sourceURLs, mustGetMcConfigPath()),
+			Error:   iodine.New(err, nil),
+		})
 	}
 	humanReadable, err := doCatCmd(sourceURLConfigMap)
 	if err != nil {
-		console.Fatalln(humanReadable)
+		console.Fatalln(console.ErrorMessage{
+			Message: humanReadable,
+			Error:   iodine.New(err, nil),
+		})
 	}
 }
 

cmd-config.go

@@ -34,13 +34,19 @@ func runConfigCmd(ctx *cli.Context) {
 	arg := ctx.Args().First()
 	tailArgs := ctx.Args().Tail()
 	if len(tailArgs) > 2 {
-		console.Fatalln("Incorrect number of arguments, please use \"mc config help\"")
+		console.Fatalln(console.ErrorMessage{
+			Message: "Incorrect number of arguments, please use \"mc config help\"",
+			Error:   iodine.New(errInvalidArgument{}, nil),
+		})
 	}
 	msg, err := doConfig(arg, tailArgs)
 	if err != nil {
-		console.Fatalln(msg)
+		console.Fatalln(console.ErrorMessage{
+			Message: msg,
+			Error:   err,
+		})
 	}
-	console.Infoln(msg)
+	console.Infoln(console.Message(msg))
 }
 
 // saveConfig writes configuration data in json format to config file.

cmd-cp.go

@@ -17,6 +17,8 @@
 package main
 
 import (
+	"errors"
+	"fmt"
 	"runtime"
 	"sync"
 
@@ -33,7 +35,7 @@ func doCopy(sourceURL string, sourceConfig *hostConfig, targetURL string, target
 	}
 	switch globalQuietFlag {
 	case true:
-		console.Infof("‘%s’ -> ‘%s’\n", sourceURL, targetURL)
+		console.Infoln(console.Message(fmt.Sprintf("‘%s’ -> ‘%s’", sourceURL, targetURL)))
 	default:
 		// set up progress
 		reader = bar.NewProxyReader(reader)
@@ -117,13 +119,21 @@ func runCopyCmd(ctx *cli.Context) {
 	if len(ctx.Args()) < 2 || ctx.Args().First() == "help" {
 		cli.ShowCommandHelpAndExit(ctx, "cp", 1) // last argument is exit code
 	}
+
 	if !isMcConfigExist() {
-		console.Fatalln("\"mc\" is not configured.  Please run \"mc config generate\".")
+		console.Fatalln(console.ErrorMessage{
+			Message: "Please run \"mc config generate\"",
+			Error:   iodine.New(errors.New("\"mc\" is not configured"), nil),
+		})
 	}
+
 	// extract URLs.
 	URLs, err := args2URLs(ctx.Args())
 	if err != nil {
-		console.Fatalln(iodine.ToError(err))
+		console.Fatalln(console.ErrorMessage{
+			Message: fmt.Sprintf("Unknown URL types: ‘%s’", URLs),
+			Error:   iodine.New(err, nil),
+		})
 	}
 
 	// Separate source and target. 'cp' can take only one target,
@@ -138,7 +148,10 @@ func runCopyCmd(ctx *cli.Context) {
 	}
 	for err := range doCopyCmd(sourceURLs, targetURL, bar) {
 		if err != nil {
-			console.Errorln(iodine.ToError(err))
+			console.Errorln(console.ErrorMessage{
+				Message: "Failed with",
+				Error:   iodine.New(err, nil),
+			})
 		}
 	}
 	if !globalQuietFlag {

cmd-diff.go

@@ -17,6 +17,9 @@
 package main
 
 import (
+	"errors"
+	"fmt"
+
 	"github.com/minio/cli"
 	"github.com/minio/mc/pkg/console"
 	"github.com/minio/minio/pkg/iodine"
@@ -28,11 +31,17 @@ func runDiffCmd(ctx *cli.Context) {
 		cli.ShowCommandHelpAndExit(ctx, "diff", 1) // last argument is exit code
 	}
 	if !isMcConfigExist() {
-		console.Fatalln("\"mc\" is not configured.  Please run \"mc config generate\".")
+		console.Fatalln(console.ErrorMessage{
+			Message: "Please run \"mc config generate\"",
+			Error:   iodine.New(errors.New("\"mc\" is not configured"), nil),
+		})
 	}
 	config, err := getMcConfig()
 	if err != nil {
-		console.Fatalf("Unable to read config file ‘%s’. Reason: %s.\n", mustGetMcConfigPath(), iodine.ToError(err))
+		console.Fatalln(console.ErrorMessage{
+			Message: fmt.Sprintf("Unable to read config file ‘%s’", mustGetMcConfigPath()),
+			Error:   err,
+		})
 	}
 
 	firstURL := ctx.Args().First()
@@ -42,40 +51,59 @@ func runDiffCmd(ctx *cli.Context) {
 	if err != nil {
 		switch iodine.ToError(err).(type) {
 		case errUnsupportedScheme:
-			console.Fatalf("Unknown type of URL ‘%s’.\n", firstURL)
+			console.Fatalln(console.ErrorMessage{
+				Message: fmt.Sprintf("Unknown type of URL ‘%s’.", firstURL),
+				Error:   err,
+			})
 		default:
-			console.Fatalf("Unable to parse argument ‘%s’. Reason: %s.\n", firstURL, iodine.ToError(err))
+			console.Fatalln(console.ErrorMessage{
+				Message: fmt.Sprintf("Unable to parse argument ‘%s’.", firstURL),
+				Error:   err,
+			})
 		}
 	}
 
 	_, err = getHostConfig(firstURL)
 	if err != nil {
-		console.Fatalf("Unable to read host configuration for ‘%s’ from config file ‘%s’. Reason: %s.\n",
+		console.Fatalln(console.ErrorMessage{
-			firstURL, mustGetMcConfigPath(), iodine.ToError(err))
+			Message: fmt.Sprintf("Unable to read host configuration for ‘%s’ from config file ‘%s’.", firstURL, mustGetMcConfigPath()),
+			Error:   err,
+		})
 	}
 
 	_, err = getHostConfig(secondURL)
 	if err != nil {
-		console.Fatalf("Unable to read host configuration for ‘%s’ from config file ‘%s’. Reason: %s.\n",
+		console.Fatalln(console.ErrorMessage{
-			secondURL, mustGetMcConfigPath(), iodine.ToError(err))
+			Message: fmt.Sprintf("Unable to read host configuration for ‘%s’ from config file ‘%s’. Reason: %s.", secondURL, mustGetMcConfigPath()),
+			Error:   err,
+		})
 	}
 
 	secondURL, err = getExpandedURL(secondURL, config.Aliases)
 	if err != nil {
 		switch iodine.ToError(err).(type) {
 		case errUnsupportedScheme:
-			console.Fatalf("Unknown type of URL ‘%s’. Reason: %s.\n", secondURL, iodine.ToError(err))
+			console.Fatalln(console.ErrorMessage{
+				Message: fmt.Sprintf("Unknown type of URL ‘%s’.", secondURL),
+				Error:   err,
+			})
 		default:
-			console.Fatalf("Unable to parse argument ‘%s’. Reason: %s.\n", secondURL, iodine.ToError(err))
+			console.Fatalln(console.ErrorMessage{
+				Message: fmt.Sprintf("Unable to parse argument ‘%s’.", secondURL),
+				Error:   err,
+			})
 		}
 	}
 	// TODO recursive is not working yet
 	newFirstURL := stripRecursiveURL(firstURL)
 	for diff := range doDiffCmd(newFirstURL, secondURL, isURLRecursive(firstURL)) {
 		if diff.err != nil {
-			console.Fatalln(diff.message)
+			console.Fatalln(console.ErrorMessage{
+				Message: diff.message,
+				Error:   diff.err,
+			})
 		}
-		console.Infoln(diff.message)
+		console.Infoln(console.Message(diff.message))
 	}
 }
 

cmd-ls.go

@@ -17,6 +17,9 @@
 package main
 
 import (
+	"errors"
+	"fmt"
+
 	"github.com/minio/cli"
 	"github.com/minio/mc/pkg/console"
 	"github.com/minio/minio/pkg/iodine"
@@ -27,12 +30,20 @@ func runListCmd(ctx *cli.Context) {
 	if !ctx.Args().Present() || ctx.Args().First() == "help" {
 		cli.ShowCommandHelpAndExit(ctx, "ls", 1) // last argument is exit code
 	}
+
 	if !isMcConfigExist() {
-		console.Fatalln("\"mc\" is not configured.  Please run \"mc config generate\".")
+		console.Fatalln(console.ErrorMessage{
+			Message: "Please run \"mc config generate\"",
+			Error:   iodine.New(errors.New("\"mc\" is not configured"), nil),
+		})
 	}
+
 	config, err := getMcConfig()
 	if err != nil {
-		console.Fatalf("Unable to read config file ‘%s’. Reason: %s.\n", mustGetMcConfigPath(), iodine.ToError(err))
+		console.Fatalln(console.ErrorMessage{
+			Message: fmt.Sprintf("Unable to read config file ‘%s’", mustGetMcConfigPath()),
+			Error:   iodine.New(err, nil),
+		})
 	}
 	targetURLConfigMap := make(map[string]*hostConfig)
 	for _, arg := range ctx.Args() {
@@ -40,15 +51,23 @@ func runListCmd(ctx *cli.Context) {
 		if err != nil {
 			switch e := iodine.ToError(err).(type) {
 			case errUnsupportedScheme:
-				console.Fatalf("Unknown type of URL ‘%s’. Reason: %s.\n", e.url, e)
+				console.Fatalln(console.ErrorMessage{
+					Message: fmt.Sprintf("Unknown type of URL ‘%s’", e.url),
+					Error:   iodine.New(e, nil),
+				})
 			default:
-				console.Fatalf("Unable to parse argument ‘%s’. Reason: %s.\n", arg, iodine.ToError(err))
+				console.Fatalln(console.ErrorMessage{
+					Message: fmt.Sprintf("Unable to parse argument ‘%s’", arg),
+					Error:   iodine.New(err, nil),
+				})
 			}
 		}
 		targetConfig, err := getHostConfig(targetURL)
 		if err != nil {
-			console.Fatalf("Unable to read host configuration for ‘%s’ from config file ‘%s’. Reason: %s.\n",
+			console.Fatalln(console.ErrorMessage{
-				targetURL, mustGetMcConfigPath(), iodine.ToError(err))
+				Message: fmt.Sprintf("Unable to read host configuration for ‘%s’ from config file ‘%s’", targetURL, mustGetMcConfigPath()),
+				Error:   iodine.New(err, nil),
+			})
 		}
 		targetURLConfigMap[targetURL] = targetConfig
 	}
@@ -56,9 +75,11 @@ func runListCmd(ctx *cli.Context) {
 		// if recursive strip off the "..."
 		newTargetURL := stripRecursiveURL(targetURL)
 		err = doListCmd(newTargetURL, targetConfig, isURLRecursive(targetURL))
-		err = iodine.New(err, nil)
 		if err != nil {
-			console.Fatalf("Failed to list ‘%s’. Reason: %s.\n", targetURL, iodine.ToError(err))
+			console.Fatalln(console.ErrorMessage{
+				Message: fmt.Sprintf("Failed to list ‘%s’", targetURL),
+				Error:   iodine.New(err, nil),
+			})
 		}
 	}
 }

cmd-mb.go

@@ -17,6 +17,7 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"time"
 
@@ -32,37 +33,51 @@ func runMakeBucketCmd(ctx *cli.Context) {
 		cli.ShowCommandHelpAndExit(ctx, "mb", 1) // last argument is exit code
 	}
 	if !isMcConfigExist() {
-		console.Fatalln("\"mc\" is not configured.  Please run \"mc config generate\".")
+		console.Fatalln(console.ErrorMessage{
+			Message: "Please run \"mc config generate\"",
+			Error:   errors.New("\"mc\" is not configured"),
+		})
 	}
 	config, err := getMcConfig()
 	if err != nil {
-		console.Fatalf("Unable to read config file ‘%s’. Reason: %s\n", mustGetMcConfigPath(), iodine.ToError(err))
+		console.Fatalln(console.ErrorMessage{
+			Message: "Unable to read config file ‘" + mustGetMcConfigPath() + "’",
+			Error:   err,
+		})
 	}
 	targetURLConfigMap := make(map[string]*hostConfig)
-	targetURLs, err := getExpandedURLs(ctx.Args(), config.Aliases)
+	for _, arg := range ctx.Args() {
-	if err != nil {
+		targetURL, err := getExpandedURL(arg, config.Aliases)
-		switch e := iodine.ToError(err).(type) {
+		if err != nil {
-		case errUnsupportedScheme:
+			switch e := iodine.ToError(err).(type) {
-			console.Fatalf("Unknown URL type ‘%s’ passed. Reason: %s.\n", e.url, e)
+			case errUnsupportedScheme:
-		default:
+				console.Fatalln(console.ErrorMessage{
-			console.Fatalf("Error in parsing path or URL. Reason: %s.\n", e)
+					Message: fmt.Sprintf("Unknown type of URL ‘%s’", e.url),
+					Error:   e,
+				})
+			default:
+				console.Fatalln(console.ErrorMessage{
+					Message: fmt.Sprintf("Unable to parse argument ‘%s’", arg),
+					Error:   err,
+				})
+			}
 		}
-	}
-	for _, targetURL := range targetURLs {
 		targetConfig, err := getHostConfig(targetURL)
 		if err != nil {
-			console.Fatalf("Unable to read configuration for host ‘%s’. Reason: %s.\n", targetURL, iodine.ToError(err))
+			console.Fatalln(console.ErrorMessage{
+				Message: fmt.Sprintf("Unable to read host configuration for ‘%s’ from config file ‘%s’", targetURL, mustGetMcConfigPath()),
+				Error:   err,
+			})
 		}
 		targetURLConfigMap[targetURL] = targetConfig
 	}
 	for targetURL, targetConfig := range targetURLConfigMap {
 		errorMsg, err := doMakeBucketCmd(targetURL, targetConfig)
-		err = iodine.New(err, nil)
 		if err != nil {
-			if errorMsg == "" {
+			console.Errorln(console.ErrorMessage{
-				errorMsg = "Empty error message.  Please rerun this command with --debug and file a bug report."
+				Message: errorMsg,
-			}
+				Error:   err,
-			console.Errorf("%s", errorMsg)
+			})
 		}
 	}
 }
@@ -73,10 +88,8 @@ func doMakeBucketCmd(targetURL string, targetConfig *hostConfig) (string, error)
 	var clnt client.Client
 	clnt, err = getNewClient(targetURL, targetConfig)
 	if err != nil {
-		err := iodine.New(err, nil)
+		msg := fmt.Sprintf("Unable to initialize client for ‘%s’", targetURL)
-		msg := fmt.Sprintf("Unable to initialize client for ‘%s’. Reason: %s.\n",
+		return msg, iodine.New(err, nil)
-			targetURL, iodine.ToError(err))
-		return msg, err
 	}
 	return doMakeBucket(clnt, targetURL)
 }
@@ -85,15 +98,14 @@ func doMakeBucketCmd(targetURL string, targetConfig *hostConfig) (string, error)
 func doMakeBucket(clnt client.Client, targetURL string) (string, error) {
 	err := clnt.MakeBucket()
 	for i := 0; i < globalMaxRetryFlag && err != nil && isValidRetry(err); i++ {
-		fmt.Println(console.Retry("Retrying ... %d", i))
+		console.Retry("Retrying ...", i)
 		// Progressively longer delays
 		time.Sleep(time.Duration(i*i) * time.Second)
 		err = clnt.MakeBucket()
 	}
 	if err != nil {
-		err := iodine.New(err, nil)
+		msg := fmt.Sprintf("Failed to create bucket for URL ‘%s’", targetURL)
-		msg := fmt.Sprintf("Failed to create bucket for URL ‘%s’. Reason: %s.\n", targetURL, iodine.ToError(err))
+		return msg, iodine.New(err, nil)
-		return msg, err
 	}
 	return "", nil
 }

cmd-sync.go

@@ -17,6 +17,8 @@
 package main
 
 import (
+	"errors"
+	"fmt"
 	"runtime"
 	"sync"
 
@@ -29,12 +31,20 @@ func runSyncCmd(ctx *cli.Context) {
 	if len(ctx.Args()) < 2 || ctx.Args().First() == "help" {
 		cli.ShowCommandHelpAndExit(ctx, "sync", 1) // last argument is exit code
 	}
+
 	if !isMcConfigExist() {
-		console.Fatalln("\"mc\" is not configured.  Please run \"mc config generate\".")
+		console.Fatalln(console.ErrorMessage{
+			Message: "Please run \"mc config generate\"",
+			Error:   iodine.New(errors.New("\"mc\" is not configured"), nil),
+		})
 	}
+
 	URLs, err := args2URLs(ctx.Args())
 	if err != nil {
-		console.Fatalln(iodine.ToError(err))
+		console.Fatalln(console.ErrorMessage{
+			Message: fmt.Sprintf("Unknown URL types found: ‘%s’", URLs),
+			Error:   iodine.New(err, nil),
+		})
 	}
 
 	// Separate source and target. 'sync' can take only one source.
@@ -66,7 +76,10 @@ func runSyncCmd(ctx *cli.Context) {
 
 	for syncURLs := range prepareSyncURLs(sourceURL, targetURLs) {
 		if syncURLs.Error != nil {
-			console.Errorln(iodine.ToError(syncURLs.Error))
+			console.Errorln(console.ErrorMessage{
+				Message: "Failed with",
+				Error:   iodine.New(syncURLs.Error, nil),
+			})
 			continue
 		}
 		syncQueue <- true
@@ -75,16 +88,25 @@ func runSyncCmd(ctx *cli.Context) {
 			defer wg.Done()
 			srcConfig, err := getHostConfig(syncURLs.SourceContent.Name)
 			if err != nil {
-				console.Errorln(iodine.ToError(err))
+				console.Fatalln(console.ErrorMessage{
+					Message: "Failed with",
+					Error:   iodine.New(err, nil),
+				})
 				return
 			}
 			tgtConfig, err := getHostConfig(syncURLs.TargetContent.Name)
 			if err != nil {
-				console.Errorln(iodine.ToError(err))
+				console.Fatalln(console.ErrorMessage{
+					Message: "Failed with",
+					Error:   iodine.New(err, nil),
+				})
 				return
 			}
 			if err := doCopy(syncURLs.SourceContent.Name, srcConfig, syncURLs.TargetContent.Name, tgtConfig, bar); err != nil {
-				console.Errorln(iodine.ToError(err))
+				console.Errorln(console.ErrorMessage{
+					Message: "Failed with",
+					Error:   iodine.New(err, nil),
+				})
 			}
 			<-syncQueue
 		}(syncURLs, &bar)

cmd-update.go

@@ -17,6 +17,8 @@
 package main
 
 import (
+	"errors"
+	"fmt"
 	"runtime"
 	"time"
 
@@ -56,17 +58,24 @@ func runUpdateCmd(ctx *cli.Context) {
 		cli.ShowCommandHelpAndExit(ctx, "update", 1) // last argument is exit code
 	}
 	if !isMcConfigExist() {
-		console.Fatalln("\"mc\" is not configured.  Please run \"mc config generate\".")
+		console.Fatalln(console.ErrorMessage{
+			Message: "Please run \"mc config generate\"",
+			Error:   iodine.New(errors.New("\"mc\" is not configured"), nil),
+		})
 	}
 	hostConfig, err := getHostConfig(mcUpdateURL)
 	if err != nil {
-		console.Fatalf("Unable to read configuration for host ‘%s’. Reason: %s.\n", mcUpdateURL, iodine.ToError(err))
+		console.Fatalln(console.ErrorMessage{
+			Message: fmt.Sprintf("Unable to read configuration for host ‘%s’", mcUpdateURL),
+			Error:   iodine.New(err, nil),
+		})
 	}
 	msg, err := doUpdateCheck(hostConfig)
 	if err != nil {
-		console.Fatalln(msg)
+		console.Fatalln(console.ErrorMessage{
-	}
+			Message: msg,
-	if msg != "" {
+			Error:   iodine.New(err, nil),
-		console.Infoln(msg)
+		})
 	}
+	console.Infoln(console.Message(msg))
 }

config.go

@@ -125,7 +125,7 @@ func getMcConfig() (*configV1, error) {
 
 }
 
-// isMcConfigExist returns true/false if config exists
+// isMcConfigExist returns err if config doesn't exist
 func isMcConfigExist() bool {
 	configFile, err := getMcConfigPath()
 	if err != nil {

ls.go

@@ -17,11 +17,7 @@
 package main
 
 import (
-	"encoding/json"
-	"fmt"
-	"os"
 	"strings"
-	"time"
 
 	"github.com/dustin/go-humanize"
 	"github.com/minio/mc/pkg/client"
@@ -36,49 +32,22 @@ const (
 	printDate = "2006-01-02 15:04:05 MST"
 )
 
-// printJSON rather than colored output
+// printContent prints content meta-data
-func printJSON(content *client.Content) {
+func printContent(c *client.Content) {
-	type jsonContent struct {
+	content := console.Content{}
-		Filetype string `json:"content-type"`
+	content.Filetype = func() string {
-		Date     string `json:"last-modified"`
+		if c.Type.IsDir() {
-		Size     string `json:"size"`
-		Name     string `json:"name"`
-	}
-	contentJSON := new(jsonContent)
-	contentJSON.Date = content.Time.Local().Format(printDate)
-	contentJSON.Size = humanize.IBytes(uint64(content.Size))
-	contentJSON.Filetype = func() string {
-		if content.Type.IsDir() {
 			return "inode/directory"
 		}
-		if content.Type.IsRegular() {
+		if c.Type.IsRegular() {
 			return "application/octet-stream"
 		}
 		return "application/octet-stream"
 	}()
-	contentJSON.Name = content.Name
+	content.Size = humanize.IBytes(uint64(c.Size))
-	contentBytes, _ := json.MarshalIndent(contentJSON, "", "\t")
+	content.Name = strings.TrimSuffix(c.Name, "/")
-	fmt.Println(string(contentBytes))
+	content.Time = c.Time.Local().Format(printDate)
-}
+	console.ContentInfo(content)
-
-// printContent prints content meta-data
-func printContent(date time.Time, size int64, name string, fileType os.FileMode) {
-	fmt.Printf(console.Time("[%s] ", date.Local().Format(printDate)))
-	fmt.Printf(console.Size("%6s ", humanize.IBytes(uint64(size))))
-
-	// just making it explicit
-	switch {
-	case fileType.IsDir() == true:
-		// if one finds a prior suffix no need to append a new one
-		switch {
-		case strings.HasSuffix(name, "/") == true:
-			fmt.Println(console.Dir("%s", name))
-		default:
-			fmt.Println(console.Dir("%s/", name))
-		}
-	default:
-		fmt.Println(console.File("%s", name))
-	}
 }
 
 // doList - list all entities inside a folder
@@ -97,12 +66,8 @@ func doList(clnt client.Client, targetURL string, recursive bool) error {
 			// To be consistent we have to filter them out
 			contentName = strings.TrimPrefix(contentName, strings.TrimSuffix(targetURL, "/")+"/")
 		}
-		switch {
+		contentCh.Content.Name = contentName
-		case globalJSONFlag == true:
+		printContent(contentCh.Content)
-			printJSON(contentCh.Content)
-		default:
-			printContent(contentCh.Content.Time, contentCh.Content.Size, contentName, contentCh.Content.Type)
-		}
 	}
 	if err != nil {
 		return iodine.New(err, map[string]string{"Target": targetURL})

main.go

@@ -17,6 +17,7 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"os"
 	"os/user"
@@ -34,7 +35,10 @@ import (
 func checkConfig() {
 	_, err := user.Current()
 	if err != nil {
-		console.Fatalln("Unable to determine current user")
+		console.Fatalln(console.ErrorMessage{
+			Message: "Unable to determine current user",
+			Error:   err,
+		})
 	}
 
 	// If config doesn't exist, do not attempt to read it
@@ -45,7 +49,10 @@ func checkConfig() {
 	// Ensures config file is sane
 	_, err = getMcConfig()
 	if err != nil {
-		console.Fatalf("Unable to read config file: %s\n", mustGetMcConfigPath())
+		console.Fatalln(console.ErrorMessage{
+			Message: fmt.Sprintf("Unable to read config file: %s", mustGetMcConfigPath()),
+			Error:   err,
+		})
 	}
 }
 
@@ -107,14 +114,23 @@ func main() {
 			app.ExtraInfo = getSystemData()
 			console.NoDebugPrint = false
 		}
+		if globalJSONFlag {
+			console.NoJSONPrint = false
+		}
 		themeName := ctx.GlobalString("theme")
 		switch {
 		case console.IsValidTheme(themeName) != true:
-			console.Fatalf("Theme ‘%s’ is not supported.  Please choose from this list: %s.\n", themeName, console.GetThemeNames())
+			console.Fatalln(console.ErrorMessage{
+				Message: fmt.Sprintf("Please choose from this list: %s.", console.GetThemeNames()),
+				Error:   fmt.Errorf("Theme ‘%s’ is not supported.", themeName),
+			})
 		default:
 			err := console.SetTheme(themeName)
 			if err != nil {
-				console.Fatalf("Failed to set theme ‘%s’. Reason: %s.\n", themeName, iodine.ToError(err))
+				console.Fatalln(console.ErrorMessage{
+					Message: fmt.Sprintf("Failed to set theme ‘%s’.", themeName),
+					Error:   err,
+				})
 			}
 		}
 		checkConfig()
@@ -122,7 +138,10 @@ func main() {
 	}
 	app.After = func(ctx *cli.Context) error {
 		if !isMcConfigExist() {
-			console.Fatalln("\"mc\" is not configured.  Please run \"mc config generate\".")
+			console.Fatalln(console.ErrorMessage{
+				Message: "Please run \"mc config generate\"",
+				Error:   iodine.New(errors.New("\"mc\" is not configured"), nil),
+			})
 		}
 		return nil
 	}

pkg/client/s3/s3.go

@@ -247,7 +247,7 @@ func (c *s3Client) listInRoutine(contentCh chan client.ContentOnChannel) {
 				content := new(client.Content)
 				content.Name = object.Data.Key
 				switch {
-				case object.Data.Size == 0:
+				case strings.HasSuffix(object.Data.Key, "/"):
 					content.Time = time.Now()
 					content.Type = os.ModeDir
 				default:

pkg/client/s3/trace.go

@@ -75,9 +75,10 @@ func (t Trace) Response(res *http.Response) (err error) {
 
 // print HTTP Response
 func (t Trace) print(data []byte) {
-	if t.Writer != nil {
+	switch {
+	case t.Writer != nil:
 		fmt.Fprintf(t.Writer, "%s", data)
-	} else {
+	default:
-		console.Debugf("%s", data)
+		console.Debugln(string(data))
 	}
 }

pkg/console/console.go

@@ -17,6 +17,7 @@
 package console
 
 import (
+	"encoding/json"
 	"fmt"
 	"os"
 	"sync"
@@ -31,6 +32,40 @@ import (
 // NoDebugPrint defines if the input should be printed in debug or not. By default it's set to true.
 var NoDebugPrint = true
 
+// NoJsonPrint defines if the input should be printed in json formatted or not. By default it's set to true.
+var NoJSONPrint = true
+
+// Message info string
+type Message string
+
+// ErrorMessage error message structure
+type ErrorMessage struct {
+	Message string `json:"Message"`
+	Error   error  `json:"Reason"`
+}
+
+// Content content message structure
+type Content struct {
+	Filetype string `json:"ContentType"`
+	Time     string `json:"LastModified"`
+	Size     string `json:"Size"`
+	Name     string `json:"Name"`
+}
+
+// Theme holds console color scheme
+type Theme struct {
+	Fatal *color.Color
+	Error *color.Color
+	Info  *color.Color
+	Debug *color.Color
+	Size  *color.Color
+	Time  *color.Color
+	File  *color.Color
+	Dir   *color.Color
+	Retry *color.Color
+	JSON  *color.Color
+}
+
 var (
 	mutex = &sync.RWMutex{}
 
@@ -54,78 +89,134 @@ var (
 		return theme
 	}()
 
-	// Print prints a error message and exits
+	// Print prints a message
 	Print = themesDB[currThemeName].Info.Print
-	// Println prints a error message with a new line and exits
-	Println = themesDB[currThemeName].Info.Println
-	// Printf prints a error message with formatting and exits
-	Printf = themesDB[currThemeName].Info.Printf
 
 	// Fatal prints a error message and exits
-	Fatal = func(a ...interface{}) { print(themesDB[currThemeName].Error, a...); os.Exit(1) }
+	Fatal = func(msg ErrorMessage) {
+		defer os.Exit(1)
+		if msg.Error != nil {
+			if NoJSONPrint {
+				reason := "Reason: " + iodine.ToError(msg.Error).Error()
+				message := msg.Message + ", " + reason
+				print(themesDB[currThemeName].Error, message)
+				if !NoDebugPrint {
+					print(themesDB[currThemeName].Error, msg.Error)
+				}
+				return
+			}
+			errorMessageBytes, _ := json.Marshal(&msg)
+			print(themesDB[currThemeName].JSON, string(errorMessageBytes))
+		}
+	}
 	// Fatalln prints a error message with a new line and exits
-	Fatalln = func(a ...interface{}) { println(themesDB[currThemeName].Error, a...); os.Exit(1) }
+	Fatalln = func(msg ErrorMessage) {
-	// Fatalf prints a error message with formatting and exits
+		defer os.Exit(1)
-	Fatalf = func(f string, a ...interface{}) { printf(themesDB[currThemeName].Error, f, a...); os.Exit(1) }
+		if msg.Error != nil {
+			if NoJSONPrint {
+				reason := "Reason: " + iodine.ToError(msg.Error).Error()
+				message := msg.Message + ", " + reason
+				println(themesDB[currThemeName].Error, message)
+				if !NoDebugPrint {
+					println(themesDB[currThemeName].Error, msg.Error)
+				}
+				return
+			}
+			errorMessageBytes, _ := json.Marshal(&msg)
+			println(themesDB[currThemeName].JSON, string(errorMessageBytes))
+		}
+	}
 
 	// Error prints a error message
-	Error = func(a ...interface{}) { print(themesDB[currThemeName].Error, a...) }
+	Error = func(msg ErrorMessage) {
+		if msg.Error != nil {
+			if NoJSONPrint {
+				reason := "Reason: " + iodine.ToError(msg.Error).Error()
+				message := msg.Message + ", " + reason
+				print(themesDB[currThemeName].Error, message)
+				if !NoDebugPrint {
+					print(themesDB[currThemeName].Error, msg.Error)
+				}
+				return
+			}
+			errorMessageBytes, _ := json.Marshal(&msg)
+			print(themesDB[currThemeName].JSON, string(errorMessageBytes))
+		}
+	}
 	// Errorln prints a error message with a new line
-	Errorln = func(a ...interface{}) { println(themesDB[currThemeName].Error, a...) }
+	Errorln = func(msg ErrorMessage) {
-	// Errorf prints a error message with formatting
+		if msg.Error != nil {
-	Errorf = func(f string, a ...interface{}) { printf(themesDB[currThemeName].Error, f, a...) }
+			if NoJSONPrint {
+				reason := "Reason: " + iodine.ToError(msg.Error).Error()
+				message := msg.Message + ", " + reason
+				println(themesDB[currThemeName].Error, message)
+				if !NoDebugPrint {
+					println(themesDB[currThemeName].Error, msg.Error)
+				}
+				return
+			}
+			errorMessageBytes, _ := json.Marshal(&msg)
+			println(themesDB[currThemeName].JSON, string(errorMessageBytes))
+		}
+	}
 
 	// Info prints a informational message
-	Info = func(a ...interface{}) { print(themesDB[currThemeName].Info, a...) }
+	Info = func(msg Message) {
-	// Infoln prints a informational message with a new line
+		if NoJSONPrint {
-	Infoln = func(a ...interface{}) { println(themesDB[currThemeName].Info, a...) }
+			print(themesDB[currThemeName].Info, msg)
-	// Infof prints a informational message with formatting
+			return
-	Infof = func(f string, a ...interface{}) { printf(themesDB[currThemeName].Info, f, a...) }
+		}
+		infoBytes, _ := json.Marshal(&msg)
+		print(themesDB[currThemeName].JSON, string(infoBytes))
+	}
 
+	// Infoln prints a informational message with a new line
+	Infoln = func(msg Message) {
+		if NoJSONPrint {
+			println(themesDB[currThemeName].Info, msg)
+			return
+		}
+		infoBytes, _ := json.Marshal(&msg)
+		println(themesDB[currThemeName].JSON, string(infoBytes))
+	}
+
+	// Debug prints a debug message without a new line
 	// Debug prints a debug message
 	Debug = func(a ...interface{}) {
 		if !NoDebugPrint {
 			print(themesDB[currThemeName].Debug, a...)
 		}
 	}
+
 	// Debugln prints a debug message with a new line
 	Debugln = func(a ...interface{}) {
 		if !NoDebugPrint {
 			println(themesDB[currThemeName].Debug, a...)
 		}
 	}
-	// Debugf prints a debug message with formatting
+	// ContentInfo prints a structure Content
-	Debugf = func(f string, a ...interface{}) {
+	ContentInfo = func(c Content) {
-		if !NoDebugPrint {
+		if NoJSONPrint {
-			printf(themesDB[currThemeName].Debug, f, a...)
+			print(themesDB[currThemeName].Time, c.Time)
+			print(themesDB[currThemeName].Size, c.Size)
+			switch c.Filetype {
+			case "inode/directory":
+				println(themesDB[currThemeName].Dir, c.Name)
+			case "application/octet-stream":
+				println(themesDB[currThemeName].File, c.Name)
+			}
+			return
 		}
+		contentBytes, _ := json.Marshal(&c)
+		println(themesDB[currThemeName].JSON, string(contentBytes))
 	}
 
-	// File - File("foo.txt")
+	// Retry prints a retry message
-	File = themesDB[currThemeName].File.SprintfFunc()
+	Retry = func(a ...interface{}) {
-	// Dir - Dir("dir/")
+		println(themesDB[currThemeName].Retry, a...)
-	Dir = themesDB[currThemeName].Dir.SprintfFunc()
+	}
-	// Size - Size("12GB")
-	Size = themesDB[currThemeName].Size.SprintfFunc()
-	// Time - Time("12 Hours")
-	Time = themesDB[currThemeName].Time.SprintfFunc()
-	// Retry - Retry message number
-	Retry = themesDB[currThemeName].Retry.SprintfFunc()
 )
 
-// Theme holds console color scheme
-type Theme struct {
-	Fatal *color.Color
-	Error *color.Color
-	Info  *color.Color
-	Debug *color.Color
-	Size  *color.Color
-	Time  *color.Color
-	File  *color.Color
-	Dir   *color.Color
-	Retry *color.Color
-}
-
 var (
 	// wrap around standard fmt functions
 	// print prints a message prefixed with message type and program name
@@ -155,11 +246,24 @@ var (
 			c.Print(a...)
 			color.Output = output
 			mutex.Unlock()
-		default:
+		case themesDB[currThemeName].Info:
 			mutex.Lock()
 			c.Print(ProgramName() + ": ")
 			c.Print(a...)
 			mutex.Unlock()
+		// special cases only for Content where it requires custom formatting
+		case themesDB[currThemeName].Time:
+			mutex.Lock()
+			c.Print(fmt.Sprintf("[%s]", a...))
+			mutex.Unlock()
+		case themesDB[currThemeName].Size:
+			mutex.Lock()
+			c.Printf(fmt.Sprintf("%6s ", a...))
+			mutex.Unlock()
+		default:
+			mutex.Lock()
+			c.Print(a...)
+			mutex.Unlock()
 		}
 	}
 
@@ -190,45 +294,23 @@ var (
 			c.Println(a...)
 			color.Output = output
 			mutex.Unlock()
-		default:
+		case themesDB[currThemeName].Info:
 			mutex.Lock()
 			c.Print(ProgramName() + ": ")
 			c.Println(a...)
 			mutex.Unlock()
-		}
+		case themesDB[currThemeName].Dir:
-	}
-
-	// printf - same as print, but takes a format specifier
-	printf = func(c *color.Color, f string, a ...interface{}) {
-		switch c {
-		case themesDB[currThemeName].Debug:
 			mutex.Lock()
-			output := color.Output
+			// ugly but its needed
-			color.Output = stderrColoredOutput
+			c.Printf("%s/\n", a...)
-			c.Print(ProgramName() + ": <DEBUG> ")
-			c.Printf(f, a...)
-			color.Output = output
 			mutex.Unlock()
-		case themesDB[currThemeName].Fatal:
+		case themesDB[currThemeName].File:
 			mutex.Lock()
-			output := color.Output
+			c.Println(a...)
-			color.Output = stderrColoredOutput
-			c.Print(ProgramName() + ": <FATAL> ")
-			c.Printf(f, a...)
-			color.Output = output
-			mutex.Unlock()
-		case themesDB[currThemeName].Error:
-			mutex.Lock()
-			output := color.Output
-			color.Output = stderrColoredOutput
-			c.Print(ProgramName() + ": <ERROR> ")
-			c.Printf(f, a...)
-			color.Output = output
 			mutex.Unlock()
 		default:
 			mutex.Lock()
-			c.Print(ProgramName() + ": ")
+			c.Println(a...)
-			c.Printf(f, a...)
 			mutex.Unlock()
 		}
 	}
@@ -262,46 +344,6 @@ func SetTheme(themeName string) error {
 	}
 
 	currThemeName = themeName
-	theme := themesDB[currThemeName]
-
-	// Error prints a error message
-	Error = func(a ...interface{}) { print(theme.Error, a...) }
-	// Errorln prints a error message with a new line
-	Errorln = func(a ...interface{}) { println(theme.Error, a...) }
-	// Errorf prints a error message with formatting
-	Errorf = func(f string, a ...interface{}) { printf(theme.Error, f, a...) }
-
-	// Info prints a informational message
-	Info = func(a ...interface{}) { print(theme.Info, a...) }
-	// Infoln prints a informational message with a new line
-	Infoln = func(a ...interface{}) { println(theme.Info, a...) }
-	// Infof prints a informational message with formatting
-	Infof = func(f string, a ...interface{}) { printf(theme.Info, f, a...) }
-
-	// Debug prints a debug message
-	Debug = func(a ...interface{}) {
-		if !NoDebugPrint {
-			print(theme.Debug, a...)
-		}
-	}
-	// Debugln prints a debug message with a new line
-	Debugln = func(a ...interface{}) {
-		if !NoDebugPrint {
-			println(theme.Debug, a...)
-		}
-	}
-	// Debugf prints a debug message with formatting
-	Debugf = func(f string, a ...interface{}) {
-		if !NoDebugPrint {
-			printf(theme.Debug, f, a...)
-		}
-	}
-
-	Dir = theme.Dir.SprintfFunc()
-	File = theme.File.SprintfFunc()
-	Size = theme.Size.SprintfFunc()
-	Time = theme.Time.SprintfFunc()
-	Retry = theme.Retry.SprintfFunc()
 
 	mutex.Unlock()
 

pkg/console/themes.go

@@ -29,6 +29,7 @@ var MiniTheme = Theme{
 	Size:  (color.New(color.FgYellow)),
 	Time:  (color.New(color.FgGreen)),
 	Retry: (color.New(color.FgMagenta, color.Bold)),
+	JSON:  (color.New(color.FgWhite, color.Italic)),
 }
 
 // WhiteTheme - All white color theme
@@ -42,6 +43,7 @@ var WhiteTheme = Theme{
 	Size:  (color.New(color.FgWhite, color.Bold)),
 	Time:  (color.New(color.FgWhite, color.Bold)),
 	Retry: (color.New(color.FgWhite, color.Bold)),
+	JSON:  (color.New(color.FgWhite, color.Bold, color.Italic)),
 }
 
 // NoColorTheme - Disables color theme
@@ -55,4 +57,5 @@ var NoColorTheme = Theme{
 	Size:  (color.New()),
 	Time:  (color.New()),
 	Retry: (color.New()),
+	JSON:  (color.New()),
 }