Refacture structure proposal. (#1793)

.gitignore

@@ -1,5 +1,5 @@
 cover.out
-mc
+./mc
 *~
 *.test
 release

Makefile

@@ -19,26 +19,32 @@ verifiers: vet fmt lint cyclo deadcode spelling
 vet:
 	@echo "Running $@:"
 	@GO15VENDOREXPERIMENT=1 go tool vet -all *.go
+	@GO15VENDOREXPERIMENT=1 go tool vet -all ./command
 	@GO15VENDOREXPERIMENT=1 go tool vet -all ./pkg
 	@GO15VENDOREXPERIMENT=1 go tool vet -shadow=true *.go
+	@GO15VENDOREXPERIMENT=1 go tool vet -shadow=true ./command
 	@GO15VENDOREXPERIMENT=1 go tool vet -shadow=true ./pkg
 
 spelling:
 	@GO15VENDOREXPERIMENT=1 ${GOPATH}/bin/misspell *.go
+	@GO15VENDOREXPERIMENT=1 ${GOPATH}/bin/misspell command/**/*
 	@GO15VENDOREXPERIMENT=1 ${GOPATH}/bin/misspell pkg/**/*
 
 fmt:
 	@echo "Running $@:"
 	@GO15VENDOREXPERIMENT=1 gofmt -s -l *.go
+	@GO15VENDOREXPERIMENT=1 gofmt -s -l command
 	@GO15VENDOREXPERIMENT=1 gofmt -s -l pkg
 lint:
 	@echo "Running $@:"
 	@GO15VENDOREXPERIMENT=1 $(GOPATH)/bin/golint .
+	@GO15VENDOREXPERIMENT=1 $(GOPATH)/bin/golint github.com/minio/mc/command
 	@GO15VENDOREXPERIMENT=1 $(GOPATH)/bin/golint github.com/minio/mc/pkg...
 
 cyclo:
 	@echo "Running $@:"
 	@GO15VENDOREXPERIMENT=1 $(GOPATH)/bin/gocyclo -over 40 *.go
+	@GO15VENDOREXPERIMENT=1 $(GOPATH)/bin/gocyclo -over 40 command
 	@GO15VENDOREXPERIMENT=1 $(GOPATH)/bin/gocyclo -over 40 pkg
 
 deadcode:
@@ -51,6 +57,7 @@ build: getdeps verifiers
 test: getdeps verifiers
 	@echo "Running all testing:"
 	@GO15VENDOREXPERIMENT=1 go test $(GOFLAGS) ./
+	@GO15VENDOREXPERIMENT=1 go test $(GOFLAGS) github.com/minio/mc/command
 	@GO15VENDOREXPERIMENT=1 go test $(GOFLAGS) github.com/minio/mc/pkg...
 
 gomake-all: build

command/access-perms.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 // isValidAccessPERM - is provided access perm string supported.
 func (b accessPerms) isValidAccessPERM() bool {

command/accounting-reader.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"sync"

command/api_handlers_test.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"bytes"

command/build-constants.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 var (
 	// mcVersion - version time.RFC3339.

command/cat-main.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"errors"

command/client-errors.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import "fmt"
 

command/client-fs.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"io"

command/client-fs_test.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"bytes"

command/client-s3-trace_v2.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"bytes"

command/client-s3-trace_v4.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"bytes"

command/client-s3.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"errors"

command/client-s3_test.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 // bucketHandler is an http.Handler that verifies bucket responses and validates incoming requests
 import (

command/client-url.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"bytes"

command/client-url_test.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import . "gopkg.in/check.v1"
 

command/client.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"io"

command/common-methods.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"io"

command/config-fix.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"fmt"

command/config-host-main.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"encoding/json"

command/config-main.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import "github.com/minio/cli"
 

command/config-migrate.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"fmt"

command/config-old.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 /////////////////// Config V1 ///////////////////
 type hostConfigV1 struct {

command/config-utils.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"regexp"

command/config-v8.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"sync"

command/config-validate.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"bytes"

command/config.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"os"

command/cp-main.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"bufio"

command/cp-url-syntax.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"fmt"

command/cp-url.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"path/filepath"

command/damerau-levenshtein.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"math"

command/diff-main.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"encoding/json"

command/difference.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"fmt"

command/error.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"encoding/json"

command/flags.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import "github.com/minio/cli"
 

command/fs-pathutils.go

@@ -16,7 +16,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 func normalizePath(path string) string {
 	return path

command/fs-pathutils_window.go

@@ -16,7 +16,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"path/filepath"

command/globals.go

@@ -15,7 +15,7 @@
  */
 
 // This package contains all the global variables and constants. ONLY TO BE ACCESSED VIA GET/SET FUNCTIONS.
-package main
+package command
 
 import (
 	"github.com/minio/cli"

command/ls-main.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"strings"

command/ls.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"encoding/json"

command/ls_test.go

@@ -14,4 +14,4 @@
  * limitations under the License.
  */
 
-package main
+package command

command/main.go

@@ -0,0 +1,268 @@
+/*
+ * Minio Client (C) 2014, 2015 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package command
+
+import (
+	"bytes"
+	"fmt"
+	"os"
+	"path/filepath"
+	"runtime"
+	"sort"
+	"strconv"
+
+	"github.com/cheggaaa/pb"
+	"github.com/minio/cli"
+	"github.com/minio/mc/pkg/console"
+	"github.com/minio/minio/pkg/probe"
+	"github.com/pkg/profile"
+)
+
+var (
+	// global flags for mc.
+	mcFlags = []cli.Flag{
+		cli.BoolFlag{
+			Name:  "help, h",
+			Usage: "Show help.",
+		},
+	}
+)
+
+// Help template for mc
+var mcHelpTemplate = `NAME:
+  {{.Name}} - {{.Usage}}
+
+USAGE:
+  {{.Name}} {{if .Flags}}[FLAGS] {{end}}COMMAND{{if .Flags}} [COMMAND FLAGS | -h]{{end}} [ARGUMENTS...]
+
+COMMANDS:
+  {{range .Commands}}{{join .Names ", "}}{{ "\t" }}{{.Usage}}
+  {{end}}{{if .Flags}}
+GLOBAL FLAGS:
+  {{range .Flags}}{{.}}
+  {{end}}{{end}}
+VERSION:
+  ` + mcVersion +
+	`{{ "\n"}}{{range $key, $value := ExtraInfo}}
+{{$key}}:
+  {{$value}}
+{{end}}`
+
+// Main starts mc application
+func Main() {
+	// Enable profiling supported modes are [cpu, mem, block].
+	// ``MC_PROFILER`` supported options are [cpu, mem, block].
+	switch os.Getenv("MC_PROFILER") {
+	case "cpu":
+		defer profile.Start(profile.CPUProfile, profile.ProfilePath(mustGetProfileDir())).Stop()
+	case "mem":
+		defer profile.Start(profile.MemProfile, profile.ProfilePath(mustGetProfileDir())).Stop()
+	case "block":
+		defer profile.Start(profile.BlockProfile, profile.ProfilePath(mustGetProfileDir())).Stop()
+	}
+
+	probe.Init() // Set project's root source path.
+	probe.SetAppInfo("Release-Tag", mcReleaseTag)
+	probe.SetAppInfo("Commit", mcShortCommitID)
+
+	app := registerApp()
+	app.Before = registerBefore
+	app.ExtraInfo = func() map[string]string {
+		if _, e := pb.GetTerminalWidth(); e != nil {
+			globalQuiet = true
+		}
+		if globalDebug {
+			return getSystemData()
+		}
+		return make(map[string]string)
+	}
+
+	app.RunAndExitOnError()
+}
+
+// Function invoked when invalid command is passed.
+func commandNotFound(ctx *cli.Context, command string) {
+	msg := fmt.Sprintf("‘%s’ is not a mc command. See ‘mc --help’.", command)
+	closestCommands := findClosestCommands(command)
+	if len(closestCommands) > 0 {
+		msg += fmt.Sprintf("\n\nDid you mean one of these?\n")
+		if len(closestCommands) == 1 {
+			cmd := closestCommands[0]
+			msg += fmt.Sprintf("        ‘%s’", cmd)
+		} else {
+			for _, cmd := range closestCommands {
+				msg += fmt.Sprintf("        ‘%s’\n", cmd)
+			}
+		}
+	}
+	fatalIf(errDummy().Trace(), msg)
+}
+
+// Check for sane config environment early on and gracefully report.
+func checkConfig() {
+	// Refresh the config once.
+	loadMcConfig = loadMcConfigFactory()
+	// Ensures config file is sane.
+	config, err := loadMcConfig()
+	// Verify if the path is accesible before validating the config
+	fatalIf(err.Trace(mustGetMcConfigPath()), "Unable to access configuration file.")
+
+	// Validate and print error messges
+	ok, errMsgs := validateConfigFile(config)
+	if !ok {
+		var errorMsg bytes.Buffer
+		for index, errMsg := range errMsgs {
+			// Print atmost 10 errors
+			if index > 10 {
+				break
+			}
+			errorMsg.WriteString(errMsg + "\n")
+		}
+		console.Fatalln(errorMsg.String())
+	}
+}
+
+func migrate() {
+	// Fix broken config files if any.
+	fixConfig()
+
+	// Migrate config files if any.
+	migrateConfig()
+
+	// Migrate session files if any.
+	migrateSession()
+
+	// Migrate shared urls if any.
+	migrateShare()
+}
+
+// Get os/arch/platform specific information.
+// Returns a map of current os/arch/platform/memstats.
+func getSystemData() map[string]string {
+	host, e := os.Hostname()
+	fatalIf(probe.NewError(e), "Unable to determine the hostname.")
+
+	memstats := &runtime.MemStats{}
+	runtime.ReadMemStats(memstats)
+	mem := fmt.Sprintf("Used: %s | Allocated: %s | UsedHeap: %s | AllocatedHeap: %s",
+		pb.Format(int64(memstats.Alloc)).To(pb.U_BYTES),
+		pb.Format(int64(memstats.TotalAlloc)).To(pb.U_BYTES),
+		pb.Format(int64(memstats.HeapAlloc)).To(pb.U_BYTES),
+		pb.Format(int64(memstats.HeapSys)).To(pb.U_BYTES))
+	platform := fmt.Sprintf("Host: %s | OS: %s | Arch: %s", host, runtime.GOOS, runtime.GOARCH)
+	goruntime := fmt.Sprintf("Version: %s | CPUs: %s", runtime.Version(), strconv.Itoa(runtime.NumCPU()))
+	return map[string]string{
+		"PLATFORM": platform,
+		"RUNTIME":  goruntime,
+		"MEM":      mem,
+	}
+}
+
+// initMC - initialize 'mc'.
+func initMC() {
+	// Check if mc config exists.
+	if !isMcConfigExists() {
+		err := saveMcConfig(newMcConfig())
+		fatalIf(err.Trace(), "Unable to save new mc config.")
+
+		console.Infoln("Configuration written to ‘" + mustGetMcConfigPath() + "’. Please update your access credentials.")
+	}
+
+	// Check if mc session folder exists.
+	if !isSessionDirExists() {
+		fatalIf(createSessionDir().Trace(), "Unable to create session config folder.")
+	}
+
+	// Check if mc share folder exists.
+	if !isShareDirExists() {
+		initShareConfig()
+	}
+}
+
+func registerBefore(ctx *cli.Context) error {
+	// Check if mc was compiled using a supported version of Golang.
+	checkGoVersion()
+
+	// Set the config folder.
+	setMcConfigDir(ctx.GlobalString("config-folder"))
+
+	// Migrate any old version of config / state files to newer format.
+	migrate()
+
+	// Initialize default config files.
+	initMC()
+
+	// Set global flags.
+	setGlobalsFromContext(ctx)
+
+	// Check if config can be read.
+	checkConfig()
+
+	return nil
+}
+
+// findClosestCommands to match a given string with commands trie tree.
+func findClosestCommands(command string) []string {
+	var closestCommands []string
+	for _, value := range commandsTree.PrefixMatch(command) {
+		closestCommands = append(closestCommands, value.(string))
+	}
+	sort.Strings(closestCommands)
+	// Suggest other close commands - allow missed, wrongly added and even transposed characters
+	for _, value := range commandsTree.walk(commandsTree.root) {
+		if sort.SearchStrings(closestCommands, value.(string)) < len(closestCommands) {
+			continue
+		}
+		// 2 is arbitrary and represents the max allowed number of typed errors
+		if DamerauLevenshteinDistance(command, value.(string)) < 2 {
+			closestCommands = append(closestCommands, value.(string))
+		}
+	}
+	return closestCommands
+}
+
+func registerApp() *cli.App {
+	// Register all the commands (refer flags.go)
+	registerCmd(lsCmd)      // List contents of a bucket.
+	registerCmd(mbCmd)      // Make a bucket.
+	registerCmd(catCmd)     // Display contents of a file.
+	registerCmd(pipeCmd)    // Write contents of stdin to a file.
+	registerCmd(shareCmd)   // Share documents via URL.
+	registerCmd(cpCmd)      // Copy objects and files from multiple sources to single destination.
+	registerCmd(mirrorCmd)  // Mirror objects and files from single source to multiple destinations.
+	registerCmd(diffCmd)    // Computer differences between two files or folders.
+	registerCmd(rmCmd)      // Remove a file or bucket
+	registerCmd(policyCmd)  // Set policy permissions.
+	registerCmd(sessionCmd) // Manage sessions for copy and mirror.
+	registerCmd(configCmd)  // Configure minio client.
+	registerCmd(updateCmd)  // Check for new software updates.
+	registerCmd(versionCmd) // Print version.
+
+	app := cli.NewApp()
+	app.Usage = "Minio Client for cloud storage and filesystems."
+	app.Commands = commands
+	app.Author = "Minio.io"
+	app.Flags = append(mcFlags, globalFlags...)
+	app.CustomAppHelpTemplate = mcHelpTemplate
+	app.CommandNotFound = commandNotFound // handler function declared above.
+	return app
+}
+
+// mustGetProfilePath must get location that the profile will be written to.
+func mustGetProfileDir() string {
+	return filepath.Join(mustGetMcConfigDir(), globalProfileDir)
+}

command/mb-main.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"encoding/json"

command/mc_test.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"path/filepath"

command/mirror-main.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"bufio"

command/mirror-url.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"fmt"

command/notifier.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"fmt"

command/pipe-main.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"os"

command/policy-main.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"encoding/json"

command/print.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import "github.com/minio/mc/pkg/console"
 

command/progress-bar.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"io"

command/rm-main.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"encoding/json"

command/runtime-checks.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"fmt"

command/scan-bar.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"fmt"

command/session-main.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"encoding/json"

command/session-migrate.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"os"

command/session-old.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"os"

command/session-v7.go

@@ -16,7 +16,7 @@
 
 // Session V2 - Version 2 stores session header and session data in
 // two separate files. Session data contains fully prepared URL list.
-package main
+package command
 
 import (
 	"encoding/json"

command/session.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"os"

command/session_test.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"os"

command/share-db-v1.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"os"

command/share-download-main.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"time"

command/share-list-main.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"fmt"

command/share-main.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"os"

command/share-upload-main.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"fmt"

command/share.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"bytes"

command/signals.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"os"

command/time.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"fmt"

command/trie.go

@@ -15,7 +15,7 @@
  */
 
 // This file implements a simple trie tree to be used for 'mc' cli commands.
-package main
+package command
 
 // This package borrows idea from - https://godoc.org/golang.org/x/text/internal/triegen.
 

command/typed-errors.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"errors"

command/update-main.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"encoding/json"

command/utils.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"math/rand"

command/version-main.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"encoding/json"

command/version_test.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package command
 
 import (
 	"net/http"

main.go

@@ -17,252 +17,9 @@
 package main
 
 import (
-	"bytes"
+	command "github.com/minio/mc/command"
-	"fmt"
-	"os"
-	"path/filepath"
-	"runtime"
-	"sort"
-	"strconv"
-
-	"github.com/cheggaaa/pb"
-	"github.com/minio/cli"
-	"github.com/minio/mc/pkg/console"
-	"github.com/minio/minio/pkg/probe"
-	"github.com/pkg/profile"
 )
 
-var (
-	// global flags for mc.
-	mcFlags = []cli.Flag{
-		cli.BoolFlag{
-			Name:  "help, h",
-			Usage: "Show help.",
-		},
-	}
-)
-
-// Help template for mc
-var mcHelpTemplate = `NAME:
-  {{.Name}} - {{.Usage}}
-
-USAGE:
-  {{.Name}} {{if .Flags}}[FLAGS] {{end}}COMMAND{{if .Flags}} [COMMAND FLAGS | -h]{{end}} [ARGUMENTS...]
-
-COMMANDS:
-  {{range .Commands}}{{join .Names ", "}}{{ "\t" }}{{.Usage}}
-  {{end}}{{if .Flags}}
-GLOBAL FLAGS:
-  {{range .Flags}}{{.}}
-  {{end}}{{end}}
-VERSION:
-  ` + mcVersion +
-	`{{ "\n"}}{{range $key, $value := ExtraInfo}}
-{{$key}}:
-  {{$value}}
-{{end}}`
-
-// Function invoked when invalid command is passed.
-func commandNotFound(ctx *cli.Context, command string) {
-	msg := fmt.Sprintf("‘%s’ is not a mc command. See ‘mc --help’.", command)
-	closestCommands := findClosestCommands(command)
-	if len(closestCommands) > 0 {
-		msg += fmt.Sprintf("\n\nDid you mean one of these?\n")
-		if len(closestCommands) == 1 {
-			cmd := closestCommands[0]
-			msg += fmt.Sprintf("        ‘%s’", cmd)
-		} else {
-			for _, cmd := range closestCommands {
-				msg += fmt.Sprintf("        ‘%s’\n", cmd)
-			}
-		}
-	}
-	fatalIf(errDummy().Trace(), msg)
-}
-
-// Check for sane config environment early on and gracefully report.
-func checkConfig() {
-	// Refresh the config once.
-	loadMcConfig = loadMcConfigFactory()
-	// Ensures config file is sane.
-	config, err := loadMcConfig()
-	// Verify if the path is accesible before validating the config
-	fatalIf(err.Trace(mustGetMcConfigPath()), "Unable to access configuration file.")
-
-	// Validate and print error messges
-	ok, errMsgs := validateConfigFile(config)
-	if !ok {
-		var errorMsg bytes.Buffer
-		for index, errMsg := range errMsgs {
-			// Print atmost 10 errors
-			if index > 10 {
-				break
-			}
-			errorMsg.WriteString(errMsg + "\n")
-		}
-		console.Fatalln(errorMsg.String())
-	}
-}
-
-func migrate() {
-	// Fix broken config files if any.
-	fixConfig()
-
-	// Migrate config files if any.
-	migrateConfig()
-
-	// Migrate session files if any.
-	migrateSession()
-
-	// Migrate shared urls if any.
-	migrateShare()
-}
-
-// Get os/arch/platform specific information.
-// Returns a map of current os/arch/platform/memstats.
-func getSystemData() map[string]string {
-	host, e := os.Hostname()
-	fatalIf(probe.NewError(e), "Unable to determine the hostname.")
-
-	memstats := &runtime.MemStats{}
-	runtime.ReadMemStats(memstats)
-	mem := fmt.Sprintf("Used: %s | Allocated: %s | UsedHeap: %s | AllocatedHeap: %s",
-		pb.Format(int64(memstats.Alloc)).To(pb.U_BYTES),
-		pb.Format(int64(memstats.TotalAlloc)).To(pb.U_BYTES),
-		pb.Format(int64(memstats.HeapAlloc)).To(pb.U_BYTES),
-		pb.Format(int64(memstats.HeapSys)).To(pb.U_BYTES))
-	platform := fmt.Sprintf("Host: %s | OS: %s | Arch: %s", host, runtime.GOOS, runtime.GOARCH)
-	goruntime := fmt.Sprintf("Version: %s | CPUs: %s", runtime.Version(), strconv.Itoa(runtime.NumCPU()))
-	return map[string]string{
-		"PLATFORM": platform,
-		"RUNTIME":  goruntime,
-		"MEM":      mem,
-	}
-}
-
-// initMC - initialize 'mc'.
-func initMC() {
-	// Check if mc config exists.
-	if !isMcConfigExists() {
-		err := saveMcConfig(newMcConfig())
-		fatalIf(err.Trace(), "Unable to save new mc config.")
-
-		console.Infoln("Configuration written to ‘" + mustGetMcConfigPath() + "’. Please update your access credentials.")
-	}
-
-	// Check if mc session folder exists.
-	if !isSessionDirExists() {
-		fatalIf(createSessionDir().Trace(), "Unable to create session config folder.")
-	}
-
-	// Check if mc share folder exists.
-	if !isShareDirExists() {
-		initShareConfig()
-	}
-}
-
-func registerBefore(ctx *cli.Context) error {
-	// Check if mc was compiled using a supported version of Golang.
-	checkGoVersion()
-
-	// Set the config folder.
-	setMcConfigDir(ctx.GlobalString("config-folder"))
-
-	// Migrate any old version of config / state files to newer format.
-	migrate()
-
-	// Initialize default config files.
-	initMC()
-
-	// Set global flags.
-	setGlobalsFromContext(ctx)
-
-	// Check if config can be read.
-	checkConfig()
-
-	return nil
-}
-
-// findClosestCommands to match a given string with commands trie tree.
-func findClosestCommands(command string) []string {
-	var closestCommands []string
-	for _, value := range commandsTree.PrefixMatch(command) {
-		closestCommands = append(closestCommands, value.(string))
-	}
-	sort.Strings(closestCommands)
-	// Suggest other close commands - allow missed, wrongly added and even transposed characters
-	for _, value := range commandsTree.walk(commandsTree.root) {
-		if sort.SearchStrings(closestCommands, value.(string)) < len(closestCommands) {
-			continue
-		}
-		// 2 is arbitrary and represents the max allowed number of typed errors
-		if DamerauLevenshteinDistance(command, value.(string)) < 2 {
-			closestCommands = append(closestCommands, value.(string))
-		}
-	}
-	return closestCommands
-}
-
-func registerApp() *cli.App {
-	// Register all the commands (refer flags.go)
-	registerCmd(lsCmd)      // List contents of a bucket.
-	registerCmd(mbCmd)      // Make a bucket.
-	registerCmd(catCmd)     // Display contents of a file.
-	registerCmd(pipeCmd)    // Write contents of stdin to a file.
-	registerCmd(shareCmd)   // Share documents via URL.
-	registerCmd(cpCmd)      // Copy objects and files from multiple sources to single destination.
-	registerCmd(mirrorCmd)  // Mirror objects and files from single source to multiple destinations.
-	registerCmd(diffCmd)    // Computer differences between two files or folders.
-	registerCmd(rmCmd)      // Remove a file or bucket
-	registerCmd(policyCmd)  // Set policy permissions.
-	registerCmd(sessionCmd) // Manage sessions for copy and mirror.
-	registerCmd(configCmd)  // Configure minio client.
-	registerCmd(updateCmd)  // Check for new software updates.
-	registerCmd(versionCmd) // Print version.
-
-	app := cli.NewApp()
-	app.Usage = "Minio Client for cloud storage and filesystems."
-	app.Commands = commands
-	app.Author = "Minio.io"
-	app.Flags = append(mcFlags, globalFlags...)
-	app.CustomAppHelpTemplate = mcHelpTemplate
-	app.CommandNotFound = commandNotFound // handler function declared above.
-	return app
-}
-
-// mustGetProfilePath must get location that the profile will be written to.
-func mustGetProfileDir() string {
-	return filepath.Join(mustGetMcConfigDir(), globalProfileDir)
-}
-
 func main() {
-	// Enable profiling supported modes are [cpu, mem, block].
+	command.Main()
-	// ``MC_PROFILER`` supported options are [cpu, mem, block].
-	switch os.Getenv("MC_PROFILER") {
-	case "cpu":
-		defer profile.Start(profile.CPUProfile, profile.ProfilePath(mustGetProfileDir())).Stop()
-	case "mem":
-		defer profile.Start(profile.MemProfile, profile.ProfilePath(mustGetProfileDir())).Stop()
-	case "block":
-		defer profile.Start(profile.BlockProfile, profile.ProfilePath(mustGetProfileDir())).Stop()
-	}
-
-	probe.Init() // Set project's root source path.
-	probe.SetAppInfo("Release-Tag", mcReleaseTag)
-	probe.SetAppInfo("Commit", mcShortCommitID)
-
-	app := registerApp()
-	app.Before = registerBefore
-
-	app.ExtraInfo = func() map[string]string {
-		if _, e := pb.GetTerminalWidth(); e != nil {
-			globalQuiet = true
-		}
-		if globalDebug {
-			return getSystemData()
-		}
-		return make(map[string]string)
-	}
-
-	app.RunAndExitOnError()
 }