Merge pull request #317 from amrfaissal/centralized-logging

New logging infrastructure for Bee

apiapp.go

@@ -549,8 +549,7 @@ func createapi(cmd *Command, args []string) int {
 	w := NewColorWriter(os.Stdout)
 
 	if len(args) < 1 {
-		ColorLog("[ERRO] Argument [appname] is missing\n")
+		logger.Fatal("Argument [appname] is missing")
-		os.Exit(2)
 	}
 
 	if len(args) > 1 {
@@ -568,7 +567,7 @@ func createapi(cmd *Command, args []string) int {
 	if conn == "" {
 	}
 
-	ColorLog("[INFO] Creating API...\n")
+	logger.Info("Creating API...")
 
 	os.MkdirAll(apppath, 0755)
 	fmt.Fprintf(w, "\t%s%screate%s\t %s%s\n", "\x1b[32m", "\x1b[1m", "\x1b[21m", apppath, "\x1b[0m")
@@ -599,9 +598,9 @@ func createapi(cmd *Command, args []string) int {
 				-1,
 			),
 		)
-		ColorLog("[INFO] Using '%s' as 'driver'\n", driver)
+		logger.Infof("Using '%s' as 'driver'", driver)
-		ColorLog("[INFO] Using '%s' as 'conn'\n", conn)
+		logger.Infof("Using '%s' as 'conn'", conn)
-		ColorLog("[INFO] Using '%s' as 'tables'\n", tables)
+		logger.Infof("Using '%s' as 'tables'", tables)
 		generateAppcode(string(driver), string(conn), "3", string(tables), apppath)
 	} else {
 		os.Mkdir(path.Join(apppath, "models"), 0755)
@@ -635,15 +634,14 @@ func createapi(cmd *Command, args []string) int {
 		WriteToFile(path.Join(apppath, "main.go"),
 			strings.Replace(apiMaingo, "{{.Appname}}", packpath, -1))
 	}
-	ColorLog("[SUCC] New API successfully created!\n")
+	logger.Success("New API successfully created!")
 	return 0
 }
 
 func checkEnv(appname string) (apppath, packpath string, err error) {
 	gps := GetGOPATHs()
 	if len(gps) == 0 {
-		ColorLog("[ERRO] Fail to start[ %s ]\n", "GOPATH environment variable is not set or empty")
+		logger.Fatal("GOPATH environment variable is not set or empty")
-		os.Exit(2)
 	}
 	currpath, _ := os.Getwd()
 	currpath = path.Join(currpath, appname)
@@ -658,15 +656,16 @@ func checkEnv(appname string) (apppath, packpath string, err error) {
 	// In case of multiple paths in the GOPATH, by default
 	// we use the first path
 	gopath := gps[0]
-	ColorLog("[%s]You current workdir is not a $GOPATH/src, bee will create the application in GOPATH: %s\n", WARN, gopath)
+
-	Debugf("GOPATH: %s", gopath)
+	logger.Warn("You current workdir is not inside $GOPATH/src")
+	logger.Debugf("GOPATH: %s", gopath)
 
 	gosrcpath := path.Join(gopath, "src")
 	apppath = path.Join(gosrcpath, appname)
 
 	if _, e := os.Stat(apppath); os.IsNotExist(e) == false {
 		err = fmt.Errorf("Cannot create application without removing '%s' first.", apppath)
-		ColorLog("[ERRO] Path '%s' already exists\n", apppath)
+		logger.Errorf("Path '%s' already exists", apppath)
 		return
 	}
 	packpath = strings.Join(strings.Split(apppath[len(gosrcpath)+1:], string(path.Separator)), "/")

autorouter.go

@@ -66,7 +66,7 @@ func getControllerInfo(path string) (map[string][]string, error) {
 
 	files := make([]*source, 0, len(fis))
 	for _, fi := range fis {
-		// Only load go files.
+		// Only load Go files
 		if strings.HasSuffix(fi.Name(), ".go") {
 			f, err := os.Open(path + "/" + fi.Name())
 			if err != nil {
@@ -107,7 +107,7 @@ func getControllerInfo(path string) (map[string][]string, error) {
 	return cm, nil
 }
 
-// A source describles a source code file.
+// source represents a source code file.
 type source struct {
 	name string
 	data []byte
@@ -120,27 +120,25 @@ func (s *source) ModTime() time.Time { return time.Time{} }
 func (s *source) IsDir() bool        { return false }
 func (s *source) Sys() interface{}   { return nil }
 
-// A routerWalker holds the state used when building the documentation.
+// routerWalker holds the state used when building the documentation.
 type routerWalker struct {
 	pdoc *Package
-	srcs map[string]*source // Source files.
+	srcs map[string]*source // Source files
 	fset *token.FileSet
-	buf  []byte // scratch space for printNode method.
+	buf  []byte // scratch space for printNode method
 }
 
 // Package represents full information and documentation for a package.
 type Package struct {
 	ImportPath string
-
+	Types      []*Type // Top-level declarations
-	// Top-level declarations.
-	Types []*Type
 }
 
 // Type represents structs and interfaces.
 type Type struct {
-	Name    string // Type name.
+	Name    string // Type name
 	Decl    string
-	Methods []*Func // Exported methods.
+	Methods []*Func // Exported methods
 }
 
 // Func represents functions
@@ -150,7 +148,7 @@ type Func struct {
 
 // build generates data from source files.
 func (w *routerWalker) build(srcs []*source) (*Package, error) {
-	// Add source files to walker, I skipped references here.
+	// Add source files to walker, I skipped references here
 	w.srcs = make(map[string]*source)
 	for _, src := range srcs {
 		w.srcs[src.name] = src
@@ -158,7 +156,7 @@ func (w *routerWalker) build(srcs []*source) (*Package, error) {
 
 	w.fset = token.NewFileSet()
 
-	// Find the package and associated files.
+	// Find the package and associated files
 	ctxt := gobuild.Context{
 		GOOS:          runtime.GOOS,
 		GOARCH:        runtime.GOARCH,
@@ -174,7 +172,7 @@ func (w *routerWalker) build(srcs []*source) (*Package, error) {
 	}
 
 	bpkg, err := ctxt.ImportDir(w.pdoc.ImportPath, 0)
-	// Continue if there are no Go source files; we still want the directory info.
+	// Continue if there are no Go source files; we still want the directory info
 	_, nogo := err.(*gobuild.NoGoError)
 	if err != nil {
 		if nogo {
@@ -272,9 +270,8 @@ func simpleImporter(imports map[string]*ast.Object, path string) (*ast.Object, e
 		name = strings.TrimPrefix(name, "biogo.")
 
 		// It's also common for the last element of the path to contain an
-		// extra "go" prefix, but not always. TODO: examine unresolved ids to
+		// extra "go" prefix, but not always.
-		// detect when trimming the "go" prefix is appropriate.
+		// TODO: examine unresolved ids to detect when trimming the "go" prefix is appropriate.
-
 		pkg = ast.NewObj(ast.Pkg, name)
 		pkg.Data = ast.NewScope(nil)
 		imports[path] = pkg

bale.go

@@ -50,19 +50,19 @@ func runBale(cmd *Command, args []string) int {
 
 	err := loadConfig()
 	if err != nil {
-		ColorLog("[ERRO] Fail to parse bee.json[ %s ]\n", err)
+		logger.Fatalf("Failed to load configuration: %s", err)
 	}
 
 	os.RemoveAll("bale")
 	os.Mkdir("bale", os.ModePerm)
 
-	// Pack and compress data.
+	// Pack and compress data
 	for _, p := range conf.Bale.Dirs {
 		if !isExist(p) {
-			ColorLog("[WARN] Skipped directory( %s )\n", p)
+			logger.Warnf("Skipped directory: %s", p)
 			continue
 		}
-		ColorLog("[INFO] Packaging directory( %s )\n", p)
+		logger.Infof("Packaging directory: %s", p)
 		filepath.Walk(p, walkFn)
 	}
 
@@ -74,22 +74,21 @@ func runBale(cmd *Command, args []string) int {
 
 	fw, err := os.Create("bale.go")
 	if err != nil {
-		ColorLog("[ERRO] Fail to create file[ %s ]\n", err)
+		logger.Fatalf("Failed to create file: %s", err)
-		os.Exit(2)
 	}
 	defer fw.Close()
 
 	_, err = fw.Write(buf.Bytes())
 	if err != nil {
-		ColorLog("[ERRO] Fail to write data[ %s ]\n", err)
+		logger.Fatalf("Failed to write data: %s", err)
-		os.Exit(2)
 	}
 
-	ColorLog("[SUCC] Baled resources successfully!\n")
+	logger.Success("Baled resources successfully!")
 	return 0
 }
 
 const (
+	// BaleHeader ...
 	BaleHeader = `package main
 
 import(
@@ -150,14 +149,13 @@ func walkFn(resPath string, info os.FileInfo, err error) error {
 		return nil
 	}
 
-	// Open resource files.
+	// Open resource files
 	fr, err := os.Open(resPath)
 	if err != nil {
-		ColorLog("[ERRO] Fail to read file[ %s ]\n", err)
+		logger.Fatalf("Failed to read file: %s", err)
-		os.Exit(2)
 	}
 
-	// Convert path.
+	// Convert path
 	resPath = strings.Replace(resPath, "_", "_0_", -1)
 	resPath = strings.Replace(resPath, ".", "_1_", -1)
 	resPath = strings.Replace(resPath, "-", "_2_", -1)
@@ -168,19 +166,18 @@ func walkFn(resPath string, info os.FileInfo, err error) error {
 	}
 	resPath = strings.Replace(resPath, sep, "_4_", -1)
 
-	// Create corresponding Go source files.
+	// Create corresponding Go source files
 	os.MkdirAll(path.Dir(resPath), os.ModePerm)
 	fw, err := os.Create("bale/" + resPath + ".go")
 	if err != nil {
-		ColorLog("[ERRO] Fail to create file[ %s ]\n", err)
+		logger.Fatalf("Failed to create file: %s", err)
-		os.Exit(2)
 	}
 	defer fw.Close()
 
-	// Write header.
+	// Write header
 	fmt.Fprintf(fw, Header, resPath)
 
-	// Copy and compress data.
+	// Copy and compress data
 	gz := gzip.NewWriter(&ByteWriter{Writer: fw})
 	io.Copy(gz, fr)
 	gz.Close()
@@ -202,6 +199,7 @@ func filterSuffix(name string) bool {
 }
 
 const (
+	// Header ...
 	Header = `package bale
 
 import(
@@ -212,6 +210,7 @@ import(
 
 func R%s() []byte {
 	gz, err := gzip.NewReader(bytes.NewBuffer([]byte{`
+	// Footer ...
 	Footer = `
 	}))
 
@@ -229,6 +228,7 @@ func R%s() []byte {
 
 var newline = []byte{'\n'}
 
+// ByteWriter ...
 type ByteWriter struct {
 	io.Writer
 	c int
@@ -244,12 +244,9 @@ func (w *ByteWriter) Write(p []byte) (n int, err error) {
 			w.Writer.Write(newline)
 			w.c = 0
 		}
-
 		fmt.Fprintf(w.Writer, "0x%02x,", p[n])
 		w.c++
 	}
-
 	n++
-
 	return
 }

banner.go

@@ -6,7 +6,6 @@ import (
 	"os"
 	"runtime"
 	"text/template"
-	"time"
 )
 
 type vars struct {
@@ -21,25 +20,17 @@ type vars struct {
 	BeegoVersion string
 }
 
-// Now returns the current local time in the specified layout
-func Now(layout string) string {
-	return time.Now().Format(layout)
-}
-
 // InitBanner loads the banner and prints it to output
 // All errors are ignored, the application will not
 // print the banner in case of error.
 func InitBanner(out io.Writer, in io.Reader) {
 	if in == nil {
-		ColorLog("[ERRO] The input is nil\n")
+		logger.Fatal("The input is nil")
-		os.Exit(2)
 	}
 
 	banner, err := ioutil.ReadAll(in)
 	if err != nil {
-		ColorLog("[ERRO] Error trying to read the banner\n")
+		logger.Fatalf("Error while trying to read the banner: %s", err)
-		ColorLog("[HINT] %v\n", err)
-		os.Exit(2)
 	}
 
 	show(out, string(banner))
@@ -51,9 +42,7 @@ func show(out io.Writer, content string) {
 		Parse(content)
 
 	if err != nil {
-		ColorLog("[ERRO] Cannot parse the banner template\n")
+		logger.Fatalf("Cannot parse the banner template: %s", err)
-		ColorLog("[HINT] %v\n", err)
-		os.Exit(2)
 	}
 
 	err = t.Execute(out, vars{
@@ -67,7 +56,5 @@ func show(out io.Writer, content string) {
 		version,
 		getBeegoVersion(),
 	})
-	if err != nil {
+	MustCheck(err)
-		panic(err)
-	}
 }

bee.go

@@ -27,6 +27,7 @@ import (
 
 const version = "1.5.2"
 
+// Command is the unit of execution
 type Command struct {
 	// Run runs the command.
 	// The args are the arguments after the command name.
@@ -60,6 +61,7 @@ func (c *Command) Name() string {
 	return name
 }
 
+// Usage puts out the usage for the command.
 func (c *Command) Usage() {
 	fmt.Fprintf(os.Stderr, "usage: %s\n\n", c.UsageLine)
 	fmt.Fprintf(os.Stderr, "%s\n", strings.TrimSpace(string(c.Long)))

code.go

@@ -109,12 +109,12 @@ func (v *annotationVisitor) Visit(n ast.Node) ast.Visitor {
 		v.ignoreName()
 		ast.Walk(v, n.Type)
 	case *ast.Field:
-		for _ = range n.Names {
+		for range n.Names {
 			v.ignoreName()
 		}
 		ast.Walk(v, n.Type)
 	case *ast.ValueSpec:
-		for _ = range n.Names {
+		for range n.Names {
 			v.add(AnchorAnnotation, "")
 		}
 		if n.Type != nil {

color.go

@@ -14,7 +14,10 @@
 
 package main
 
-import "io"
+import (
+	"fmt"
+	"io"
+)
 
 type outputMode int
 
@@ -49,3 +52,77 @@ func NewModeColorWriter(w io.Writer, mode outputMode) io.Writer {
 	}
 	return w
 }
+
+func bold(message string) string {
+	return fmt.Sprintf("\x1b[1m%s\x1b[21m", message)
+}
+
+// Cyan returns a cyan string
+func Cyan(message string) string {
+	return fmt.Sprintf("\x1b[36m%s\x1b[0m", message)
+}
+
+// Blue returns a blue string
+func Blue(message string) string {
+	return fmt.Sprintf("\x1b[34m%s\x1b[0m", message)
+}
+
+// Red returns a red string
+func Red(message string) string {
+	return fmt.Sprintf("\x1b[31m%s\x1b[0m", message)
+}
+
+// Green returns a green string
+func Green(message string) string {
+	return fmt.Sprintf("\x1b[32m%s\x1b[0m", message)
+}
+
+// Yellow returns a yellow string
+func Yellow(message string) string {
+	return fmt.Sprintf("\x1b[33m%s\x1b[0m", message)
+}
+
+// Gray returns a gray string
+func Gray(message string) string {
+	return fmt.Sprintf("\x1b[37m%s\x1b[0m", message)
+}
+
+// Magenta returns a magenta string
+func Magenta(message string) string {
+	return fmt.Sprintf("\x1b[35m%s\x1b[0m", message)
+}
+
+// CyanBold returns a cyan bold string
+func CyanBold(message string) string {
+	return fmt.Sprintf("\x1b[36m%s\x1b[0m", bold(message))
+}
+
+// BlueBold returns a blue bold string
+func BlueBold(message string) string {
+	return fmt.Sprintf("\x1b[34m%s\x1b[0m", bold(message))
+}
+
+// RedBold returns a red bold string
+func RedBold(message string) string {
+	return fmt.Sprintf("\x1b[31m%s\x1b[0m", bold(message))
+}
+
+// GreenBold returns a green bold string
+func GreenBold(message string) string {
+	return fmt.Sprintf("\x1b[32m%s\x1b[0m", bold(message))
+}
+
+// YellowBold returns a yellow bold string
+func YellowBold(message string) string {
+	return fmt.Sprintf("\x1b[33m%s\x1b[0m", bold(message))
+}
+
+// GrayBold returns a gray bold string
+func GrayBold(message string) string {
+	return fmt.Sprintf("\x1b[37m%s\x1b[0m", bold(message))
+}
+
+// MagentaBold returns a magenta bold string
+func MagentaBold(message string) string {
+	return fmt.Sprintf("\x1b[35m%s\x1b[0m", bold(message))
+}

colorwriter_windows.go

@@ -419,7 +419,7 @@ func (cw *colorWriter) Write(p []byte) (int, error) {
 	}
 
 	if cw.mode != DiscardNonColorEscSeq || cw.state == outsideCsiCode {
-		nw, err = cw.w.Write(p[first:len(p)])
+		nw, err = cw.w.Write(p[first:])
 		r += nw
 	}
 

conf.go

@@ -25,7 +25,7 @@ import (
 	"gopkg.in/yaml.v2"
 )
 
-const ConfVer = 0
+const confVer = 0
 
 var defaultConf = `{
 	"version": 0,
@@ -89,20 +89,20 @@ func loadConfig() (err error) {
 		}
 
 		if fileInfo.Name() == "bee.json" {
-			ColorLog("[INFO] Loading configuration from 'bee.json'...\n")
+			logger.Info("Loading configuration from 'bee.json'...")
 			err = parseJSON(path, conf)
 			if err != nil {
-				ColorLog("[ERRO] Failed to parse JSON file: %v\n", err)
+				logger.Errorf("Failed to parse JSON file: %s", err)
 				return err
 			}
 			return io.EOF
 		}
 
 		if fileInfo.Name() == "Beefile" {
-			ColorLog("[INFO] Loading configuration from 'Beefile'...\n")
+			logger.Info("Loading configuration from 'Beefile'...")
 			err = parseYAML(path, conf)
 			if err != nil {
-				ColorLog("[ERRO] Failed to parse YAML file: %v\n", err)
+				logger.Errorf("Failed to parse YAML file: %s", err)
 				return err
 			}
 			return io.EOF
@@ -113,7 +113,7 @@ func loadConfig() (err error) {
 	// In case no configuration file found or an error different than io.EOF,
 	// fallback to default configuration
 	if err != io.EOF {
-		ColorLog("[INFO] Loading default configuration...\n")
+		logger.Info("Loading default configuration...")
 		err = json.Unmarshal([]byte(defaultConf), &conf)
 		if err != nil {
 			return
@@ -124,9 +124,9 @@ func loadConfig() (err error) {
 	err = nil
 
 	// Check format version
-	if conf.Version != ConfVer {
+	if conf.Version != confVer {
-		ColorLog("[WARN] Your bee.json is outdated. Please do consider updating it.\n")
+		logger.Warn("Your configuration file is outdated. Please do consider updating it.")
-		ColorLog("[HINT] Compare bee.json under bee source code path and yours\n")
+		logger.Hint("Check the latest version of bee's configuration file.")
 	}
 
 	// Set variables

fix.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"go/parser"
 	"go/token"
 	"io/ioutil"
@@ -8,7 +9,6 @@ import (
 	"path/filepath"
 	"regexp"
 	"strings"
-	"fmt"
 )
 
 var cmdFix = &Command{
@@ -28,11 +28,12 @@ func init() {
 func runFix(cmd *Command, args []string) int {
 	ShowShortVersionBanner()
 
-	ColorLog("[INFO] Upgrading the application...\n")
+	logger.Info("Upgrading the application...")
 	dir, err := os.Getwd()
 	if err != nil {
-		ColorLog("[ERRO] GetCurrent Path:%s\n", err)
+		logger.Fatalf("Error while getting the current working directory: %s", err)
 	}
+
 	filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
 		if info.IsDir() {
 			if strings.HasPrefix(info.Name(), ".") {
@@ -49,11 +50,11 @@ func runFix(cmd *Command, args []string) int {
 		err = fixFile(path)
 		fmt.Println("\tfix\t", path)
 		if err != nil {
-			ColorLog("[ERRO] Could not fix file: %s\n", err)
+			logger.Errorf("Could not fix file: %s", err)
 		}
 		return err
 	})
-	ColorLog("[INFO] Upgrade done!\n")
+	logger.Success("Upgrade done!")
 	return 0
 }
 
@@ -167,18 +168,18 @@ func fixFile(file string) error {
 	}
 	fixed := rp.Replace(string(content))
 
-	// forword the RequestBody from the replace
+	// Forword the RequestBody from the replace
 	// "Input.Request", "Input.Context.Request",
 	fixed = strings.Replace(fixed, "Input.Context.RequestBody", "Input.RequestBody", -1)
 
-	// regexp replace
+	// Regexp replace
 	pareg := regexp.MustCompile(`(Input.Params\[")(.*)("])`)
 	fixed = pareg.ReplaceAllString(fixed, "Input.Param(\"$2\")")
 	pareg = regexp.MustCompile(`(Input.Data\[\")(.*)(\"\])(\s)(=)(\s)(.*)`)
 	fixed = pareg.ReplaceAllString(fixed, "Input.SetData(\"$2\", $7)")
 	pareg = regexp.MustCompile(`(Input.Data\[\")(.*)(\"\])`)
 	fixed = pareg.ReplaceAllString(fixed, "Input.Data(\"$2\")")
-	// fix the cache object Put method
+	// Fix the cache object Put method
 	pareg = regexp.MustCompile(`(\.Put\(\")(.*)(\",)(\s)(.*)(,\s*)([^\*.]*)(\))`)
 	if pareg.MatchString(fixed) && strings.HasSuffix(file, ".go") {
 		fixed = pareg.ReplaceAllString(fixed, ".Put(\"$2\", $5, $7*time.Second)")
@@ -199,11 +200,11 @@ func fixFile(file string) error {
 			fixed = strings.Replace(fixed, "import (", "import (\n\t\"time\"", 1)
 		}
 	}
-	// replace the v.Apis in docs.go
+	// Replace the v.Apis in docs.go
 	if strings.Contains(file, "docs.go") {
 		fixed = strings.Replace(fixed, "v.Apis", "v.APIs", -1)
 	}
-	// replace the config file
+	// Replace the config file
 	if strings.HasSuffix(file, ".conf") {
 		fixed = strings.Replace(fixed, "HttpCertFile", "HTTPSCertFile", -1)
 		fixed = strings.Replace(fixed, "HttpKeyFile", "HTTPSKeyFile", -1)

g.go

@@ -81,29 +81,28 @@ func generateCode(cmd *Command, args []string) int {
 
 	currpath, _ := os.Getwd()
 	if len(args) < 1 {
-		ColorLog("[ERRO] command is missing\n")
+		logger.Fatal("Command is missing")
-		os.Exit(2)
 	}
 
 	gps := GetGOPATHs()
 	if len(gps) == 0 {
-		ColorLog("[ERRO] Fail to start[ %s ]\n", "GOPATH environment variable is not set or empty")
+		logger.Fatal("GOPATH environment variable is not set or empty")
-		os.Exit(2)
 	}
+
 	gopath := gps[0]
-	Debugf("GOPATH: %s", gopath)
+
+	logger.Debugf("GOPATH: %s", gopath)
 
 	gcmd := args[0]
 	switch gcmd {
 	case "scaffold":
 		if len(args) < 2 {
-			ColorLog("[ERRO] Wrong number of arguments\n")
+			logger.Fatal("Wrong number of arguments. Run: bee help generate")
-			ColorLog("[HINT] Usage: bee generate scaffold [scaffoldname] [-fields=\"\"]\n")
-			os.Exit(2)
 		}
+		// Load the configuration
 		err := loadConfig()
 		if err != nil {
-			ColorLog("[ERRO] Fail to parse bee.json[ %s ]\n", err)
+			logger.Fatalf("Failed to load configuration: %s", err)
 		}
 		cmd.Flag.Parse(args[2:])
 		if driver == "" {
@@ -119,19 +118,18 @@ func generateCode(cmd *Command, args []string) int {
 			}
 		}
 		if fields == "" {
-			ColorLog("[ERRO] Wrong number of arguments\n")
+			logger.Hint("fields option should not be empty, i.e. -fields=\"title:string,body:text\"")
-			ColorLog("[HINT] Usage: bee generate scaffold [scaffoldname] [-fields=\"title:string,body:text\"]\n")
+			logger.Fatal("Wrong number of arguments. Run: bee help generate")
-			os.Exit(2)
 		}
 		sname := args[1]
 		generateScaffold(sname, fields.String(), currpath, driver.String(), conn.String())
 	case "docs":
 		generateDocs(currpath)
 	case "appcode":
-		// load config
+		// Load the configuration
 		err := loadConfig()
 		if err != nil {
-			ColorLog("[ERRO] Fail to parse bee.json[ %s ]\n", err)
+			logger.Fatalf("Failed to load configuration: %s", err)
 		}
 		cmd.Flag.Parse(args[1:])
 		if driver == "" {
@@ -153,20 +151,20 @@ func generateCode(cmd *Command, args []string) int {
 		if level == "" {
 			level = "3"
 		}
-		ColorLog("[INFO] Using '%s' as 'driver'\n", driver)
+		logger.Infof("Using '%s' as 'driver'", driver)
-		ColorLog("[INFO] Using '%s' as 'conn'\n", conn)
+		logger.Infof("Using '%s' as 'conn'", conn)
-		ColorLog("[INFO] Using '%s' as 'tables'\n", tables)
+		logger.Infof("Using '%s' as 'tables'", tables)
-		ColorLog("[INFO] Using '%s' as 'level'\n", level)
+		logger.Infof("Using '%s' as 'level'", level)
 		generateAppcode(driver.String(), conn.String(), level.String(), tables.String(), currpath)
 	case "migration":
 		if len(args) < 2 {
-			ColorLog("[ERRO] Wrong number of arguments\n")
+			logger.Fatal("Wrong number of arguments. Run: bee help generate")
-			ColorLog("[HINT] Usage: bee generate migration [migrationname] [-fields=\"\"]\n")
-			os.Exit(2)
 		}
 		cmd.Flag.Parse(args[2:])
 		mname := args[1]
-		ColorLog("[INFO] Using '%s' as migration name\n", mname)
+
+		logger.Infof("Using '%s' as migration name", mname)
+
 		upsql := ""
 		downsql := ""
 		if fields != "" {
@@ -180,21 +178,16 @@ func generateCode(cmd *Command, args []string) int {
 			cname := args[1]
 			generateController(cname, currpath)
 		} else {
-			ColorLog("[ERRO] Wrong number of arguments\n")
+			logger.Fatal("Wrong number of arguments. Run: bee help generate")
-			ColorLog("[HINT] Usage: bee generate controller [controllername]\n")
-			os.Exit(2)
 		}
 	case "model":
 		if len(args) < 2 {
-			ColorLog("[ERRO] Wrong number of arguments\n")
+			logger.Fatal("Wrong number of arguments. Run: bee help generate")
-			ColorLog("[HINT] Usage: bee generate model [modelname] [-fields=\"\"]\n")
-			os.Exit(2)
 		}
 		cmd.Flag.Parse(args[2:])
 		if fields == "" {
-			ColorLog("[ERRO] Wrong number of arguments\n")
+			logger.Hint("fields option should not be empty, i.e. -fields=\"title:string,body:text\"")
-			ColorLog("[HINT] Usage: bee generate model [modelname] [-fields=\"title:string,body:text\"]\n")
+			logger.Fatal("Wrong number of arguments. Run: bee help generate")
-			os.Exit(2)
 		}
 		sname := args[1]
 		generateModel(sname, fields.String(), currpath)
@@ -203,13 +196,11 @@ func generateCode(cmd *Command, args []string) int {
 			cname := args[1]
 			generateView(cname, currpath)
 		} else {
-			ColorLog("[ERRO] Wrong number of arguments\n")
+			logger.Fatal("Wrong number of arguments. Run: bee help generate")
-			ColorLog("[HINT] Usage: bee generate view [viewpath]\n")
-			os.Exit(2)
 		}
 	default:
-		ColorLog("[ERRO] Command is missing\n")
+		logger.Fatal("Command is missing")
 	}
-	ColorLog("[SUCC] %s successfully generated!\n", strings.Title(gcmd))
+	logger.Successf("%s successfully generated!", strings.Title(gcmd))
 	return 0
 }

g_appcode.go

@@ -18,7 +18,6 @@ import (
 	"database/sql"
 	"fmt"
 	"os"
-	"os/exec"
 	"path"
 	"path/filepath"
 	"regexp"
@@ -39,7 +38,7 @@ type DbTransformer interface {
 	GetTableNames(conn *sql.DB) []string
 	GetConstraints(conn *sql.DB, table *Table, blackList map[string]bool)
 	GetColumns(conn *sql.DB, table *Table, blackList map[string]bool)
-	GetGoDataType(sqlType string) string
+	GetGoDataType(sqlType string) (string, error)
 }
 
 // MysqlDB is the MySQL version of DbTransformer
@@ -265,9 +264,7 @@ func generateAppcode(driver, connStr, level, tables, currpath string) {
 	case "3":
 		mode = OModel | OController | ORouter
 	default:
-		ColorLog("[ERRO] Invalid 'level' option: %s\n", level)
+		logger.Fatal("Invalid level value. Must be either \"1\", \"2\", or \"3\"")
-		ColorLog("[HINT] Level must be either 1, 2 or 3\n")
-		os.Exit(2)
 	}
 	var selectedTables map[string]bool
 	if tables != "" {
@@ -280,12 +277,9 @@ func generateAppcode(driver, connStr, level, tables, currpath string) {
 	case "mysql":
 	case "postgres":
 	case "sqlite":
-		ColorLog("[ERRO] Generating app code from SQLite database is not supported yet.\n")
+		logger.Fatal("Generating app code from SQLite database is not supported yet.")
-		os.Exit(2)
 	default:
-		ColorLog("[ERRO] Unknown database driver: %s\n", driver)
+		logger.Fatal("Unknown database driver. Must be either \"mysql\", \"postgres\" or \"sqlite\"")
-		ColorLog("[HINT] Driver must be one of mysql, postgres or sqlite\n")
-		os.Exit(2)
 	}
 	gen(driver, connStr, mode, selectedTables, currpath)
 }
@@ -295,12 +289,11 @@ func generateAppcode(driver, connStr, level, tables, currpath string) {
 func gen(dbms, connStr string, mode byte, selectedTableNames map[string]bool, apppath string) {
 	db, err := sql.Open(dbms, connStr)
 	if err != nil {
-		ColorLog("[ERRO] Could not connect to %s database: %s, %s\n", dbms, connStr, err)
+		logger.Fatalf("Could not connect to '%s' database using '%s': %s", dbms, connStr, err)
-		os.Exit(2)
 	}
 	defer db.Close()
 	if trans, ok := dbDriver[dbms]; ok {
-		ColorLog("[INFO] Analyzing database tables...\n")
+		logger.Info("Analyzing database tables...")
 		tableNames := trans.GetTableNames(db)
 		tables := getTableObjects(tableNames, db, trans)
 		mvcPath := new(MvcPath)
@@ -311,25 +304,21 @@ func gen(dbms, connStr string, mode byte, selectedTableNames map[string]bool, ap
 		pkgPath := getPackagePath(apppath)
 		writeSourceFiles(pkgPath, tables, mode, mvcPath, selectedTableNames)
 	} else {
-		ColorLog("[ERRO] Generating app code from %s database is not supported yet.\n", dbms)
+		logger.Fatalf("Generating app code from '%s' database is not supported yet.", dbms)
-		os.Exit(2)
 	}
 }
 
-// getTables gets a list table names in current database
+// GetTableNames returns a slice of table names in the current database
 func (*MysqlDB) GetTableNames(db *sql.DB) (tables []string) {
 	rows, err := db.Query("SHOW TABLES")
 	if err != nil {
-		ColorLog("[ERRO] Could not show tables\n")
+		logger.Fatalf("Could not show tables: %s", err)
-		ColorLog("[HINT] Check your connection string\n")
-		os.Exit(2)
 	}
 	defer rows.Close()
 	for rows.Next() {
 		var name string
 		if err := rows.Scan(&name); err != nil {
-			ColorLog("[ERRO] Could not show tables\n")
+			logger.Fatalf("Could not show tables: %s", err)
-			os.Exit(2)
 		}
 		tables = append(tables, name)
 	}
@@ -358,8 +347,8 @@ func getTableObjects(tableNames []string, db *sql.DB, dbTransformer DbTransforme
 	return
 }
 
-// getConstraints gets primary key, unique key and foreign keys of a table from information_schema
+// GetConstraints gets primary key, unique key and foreign keys of a table from
-// and fill in Table struct
+// information_schema and fill in the Table struct
 func (*MysqlDB) GetConstraints(db *sql.DB, table *Table, blackList map[string]bool) {
 	rows, err := db.Query(
 		`SELECT
@@ -372,14 +361,12 @@ func (*MysqlDB) GetConstraints(db *sql.DB, table *Table, blackList map[string]bo
 			c.table_schema = database() AND c.table_name = ? AND u.table_schema = database() AND u.table_name = ?`,
 		table.Name, table.Name) //  u.position_in_unique_constraint,
 	if err != nil {
-		ColorLog("[ERRO] Could not query INFORMATION_SCHEMA for PK/UK/FK information\n")
+		logger.Fatal("Could not query INFORMATION_SCHEMA for PK/UK/FK information")
-		os.Exit(2)
 	}
 	for rows.Next() {
 		var constraintTypeBytes, columnNameBytes, refTableSchemaBytes, refTableNameBytes, refColumnNameBytes, refOrdinalPosBytes []byte
 		if err := rows.Scan(&constraintTypeBytes, &columnNameBytes, &refTableSchemaBytes, &refTableNameBytes, &refColumnNameBytes, &refOrdinalPosBytes); err != nil {
-			ColorLog("[ERRO] Could not read INFORMATION_SCHEMA for PK/UK/FK information\n")
+			logger.Fatal("Could not read INFORMATION_SCHEMA for PK/UK/FK information")
-			os.Exit(2)
 		}
 		constraintType, columnName, refTableSchema, refTableName, refColumnName, refOrdinalPos :=
 			string(constraintTypeBytes), string(columnNameBytes), string(refTableSchemaBytes),
@@ -389,7 +376,7 @@ func (*MysqlDB) GetConstraints(db *sql.DB, table *Table, blackList map[string]bo
 				table.Pk = columnName
 			} else {
 				table.Pk = ""
-				// add table to blacklist so that other struct will not reference it, because we are not
+				// Add table to blacklist so that other struct will not reference it, because we are not
 				// registering blacklisted tables
 				blackList[table.Name] = true
 			}
@@ -406,11 +393,11 @@ func (*MysqlDB) GetConstraints(db *sql.DB, table *Table, blackList map[string]bo
 	}
 }
 
-// getColumns retrieve columns details from information_schema
+// GetColumns retrieves columns details from
-// and fill in the Column struct
+// information_schema and fill in the Column struct
 func (mysqlDB *MysqlDB) GetColumns(db *sql.DB, table *Table, blackList map[string]bool) {
 	// retrieve columns
-	colDefRows, _ := db.Query(
+	colDefRows, err := db.Query(
 		`SELECT
 			column_name, data_type, column_type, is_nullable, column_default, extra
 		FROM
@@ -418,20 +405,28 @@ func (mysqlDB *MysqlDB) GetColumns(db *sql.DB, table *Table, blackList map[strin
 		WHERE
 			table_schema = database() AND table_name = ?`,
 		table.Name)
+	if err != nil {
+		logger.Fatalf("Could not query the database: %s", err)
+	}
 	defer colDefRows.Close()
+
 	for colDefRows.Next() {
 		// datatype as bytes so that SQL <null> values can be retrieved
 		var colNameBytes, dataTypeBytes, columnTypeBytes, isNullableBytes, columnDefaultBytes, extraBytes []byte
 		if err := colDefRows.Scan(&colNameBytes, &dataTypeBytes, &columnTypeBytes, &isNullableBytes, &columnDefaultBytes, &extraBytes); err != nil {
-			ColorLog("[ERRO] Could not query INFORMATION_SCHEMA for column information\n")
+			logger.Fatal("Could not query INFORMATION_SCHEMA for column information")
-			os.Exit(2)
 		}
 		colName, dataType, columnType, isNullable, columnDefault, extra :=
 			string(colNameBytes), string(dataTypeBytes), string(columnTypeBytes), string(isNullableBytes), string(columnDefaultBytes), string(extraBytes)
+
 		// create a column
 		col := new(Column)
 		col.Name = camelCase(colName)
-		col.Type = mysqlDB.GetGoDataType(dataType)
+		col.Type, err = mysqlDB.GetGoDataType(dataType)
+		if err != nil {
+			logger.Fatalf("%s", err)
+		}
+
 		// Tag info
 		tag := new(OrmTag)
 		tag.Column = colName
@@ -466,7 +461,10 @@ func (mysqlDB *MysqlDB) GetColumns(db *sql.DB, table *Table, blackList map[strin
 				if isSQLSignedIntType(dataType) {
 					sign := extractIntSignness(columnType)
 					if sign == "unsigned" && extra != "auto_increment" {
-						col.Type = mysqlDB.GetGoDataType(dataType + " " + sign)
+						col.Type, err = mysqlDB.GetGoDataType(dataType + " " + sign)
+						if err != nil {
+							logger.Fatalf("%s", err)
+						}
 					}
 				}
 				if isSQLStringType(dataType) {
@@ -500,15 +498,13 @@ func (mysqlDB *MysqlDB) GetColumns(db *sql.DB, table *Table, blackList map[strin
 }
 
 // GetGoDataType maps an SQL data type to Golang data type
-func (*MysqlDB) GetGoDataType(sqlType string) (goType string) {
+func (*MysqlDB) GetGoDataType(sqlType string) (string, error) {
 	var typeMapping = map[string]string{}
 	typeMapping = typeMappingMysql
 	if v, ok := typeMapping[sqlType]; ok {
-		return v
+		return v, nil
 	}
-	ColorLog("[ERRO] data type (%s) not found!\n", sqlType)
+	return "", fmt.Errorf("data type '%s' not found", sqlType)
-	os.Exit(2)
-	return goType
 }
 
 // GetTableNames for PostgreSQL
@@ -519,16 +515,14 @@ func (*PostgresDB) GetTableNames(db *sql.DB) (tables []string) {
 		table_type = 'BASE TABLE' AND
 		table_schema NOT IN ('pg_catalog', 'information_schema')`)
 	if err != nil {
-		ColorLog("[ERRO] Could not show tables: %s\n", err)
+		logger.Fatalf("Could not show tables: %s", err)
-		ColorLog("[HINT] Check your connection string\n")
-		os.Exit(2)
 	}
 	defer rows.Close()
+
 	for rows.Next() {
 		var name string
 		if err := rows.Scan(&name); err != nil {
-			ColorLog("[ERRO] Could not show tables\n")
+			logger.Fatalf("Could not show tables: %s", err)
-			os.Exit(2)
 		}
 		tables = append(tables, name)
 	}
@@ -558,14 +552,13 @@ func (*PostgresDB) GetConstraints(db *sql.DB, table *Table, blackList map[string
 			 AND u.table_name = $2`,
 		table.Name, table.Name) //  u.position_in_unique_constraint,
 	if err != nil {
-		ColorLog("[ERRO] Could not query INFORMATION_SCHEMA for PK/UK/FK information: %s\n", err)
+		logger.Fatalf("Could not query INFORMATION_SCHEMA for PK/UK/FK information: %s", err)
-		os.Exit(2)
 	}
+
 	for rows.Next() {
 		var constraintTypeBytes, columnNameBytes, refTableSchemaBytes, refTableNameBytes, refColumnNameBytes, refOrdinalPosBytes []byte
 		if err := rows.Scan(&constraintTypeBytes, &columnNameBytes, &refTableSchemaBytes, &refTableNameBytes, &refColumnNameBytes, &refOrdinalPosBytes); err != nil {
-			ColorLog("[ERRO] Could not read INFORMATION_SCHEMA for PK/UK/FK information\n")
+			logger.Fatalf("Could not read INFORMATION_SCHEMA for PK/UK/FK information: %s", err)
-			os.Exit(2)
 		}
 		constraintType, columnName, refTableSchema, refTableName, refColumnName, refOrdinalPos :=
 			string(constraintTypeBytes), string(columnNameBytes), string(refTableSchemaBytes),
@@ -595,7 +588,7 @@ func (*PostgresDB) GetConstraints(db *sql.DB, table *Table, blackList map[string
 // GetColumns for PostgreSQL
 func (postgresDB *PostgresDB) GetColumns(db *sql.DB, table *Table, blackList map[string]bool) {
 	// retrieve columns
-	colDefRows, _ := db.Query(
+	colDefRows, err := db.Query(
 		`SELECT
 			column_name,
 			data_type,
@@ -614,20 +607,27 @@ func (postgresDB *PostgresDB) GetColumns(db *sql.DB, table *Table, blackList map
 			table_catalog = current_database() AND table_schema NOT IN ('pg_catalog', 'information_schema')
 			 AND table_name = $1`,
 		table.Name)
+	if err != nil {
+		logger.Fatalf("Could not query INFORMATION_SCHEMA for column information: %s", err)
+	}
 	defer colDefRows.Close()
+
 	for colDefRows.Next() {
 		// datatype as bytes so that SQL <null> values can be retrieved
 		var colNameBytes, dataTypeBytes, columnTypeBytes, isNullableBytes, columnDefaultBytes, extraBytes []byte
 		if err := colDefRows.Scan(&colNameBytes, &dataTypeBytes, &columnTypeBytes, &isNullableBytes, &columnDefaultBytes, &extraBytes); err != nil {
-			ColorLog("[ERRO] Could not query INFORMATION_SCHEMA for column information\n")
+			logger.Fatalf("Could not query INFORMATION_SCHEMA for column information: %s", err)
-			os.Exit(2)
 		}
 		colName, dataType, columnType, isNullable, columnDefault, extra :=
 			string(colNameBytes), string(dataTypeBytes), string(columnTypeBytes), string(isNullableBytes), string(columnDefaultBytes), string(extraBytes)
-		// create a column
+		// Create a column
 		col := new(Column)
 		col.Name = camelCase(colName)
-		col.Type = postgresDB.GetGoDataType(dataType)
+		col.Type, err = postgresDB.GetGoDataType(dataType)
+		if err != nil {
+			logger.Fatalf("%s", err)
+		}
+
 		// Tag info
 		tag := new(OrmTag)
 		tag.Column = colName
@@ -690,13 +690,11 @@ func (postgresDB *PostgresDB) GetColumns(db *sql.DB, table *Table, blackList map
 }
 
 // GetGoDataType returns the Go type from the mapped Postgres type
-func (*PostgresDB) GetGoDataType(sqlType string) (goType string) {
+func (*PostgresDB) GetGoDataType(sqlType string) (string, error) {
 	if v, ok := typeMappingPostgres[sqlType]; ok {
-		return v
+		return v, nil
 	}
-	ColorLog("[ERRO] data type (%s) not found!\n", sqlType)
+	return "", fmt.Errorf("data type '%s' not found", sqlType)
-	os.Exit(2)
-	return goType
 }
 
 // deleteAndRecreatePaths removes several directories completely
@@ -717,15 +715,15 @@ func createPaths(mode byte, paths *MvcPath) {
 // Newly geneated files will be inside these folders.
 func writeSourceFiles(pkgPath string, tables []*Table, mode byte, paths *MvcPath, selectedTables map[string]bool) {
 	if (OModel & mode) == OModel {
-		ColorLog("[INFO] Creating model files...\n")
+		logger.Info("Creating model files...")
 		writeModelFiles(tables, paths.ModelPath, selectedTables)
 	}
 	if (OController & mode) == OController {
-		ColorLog("[INFO] Creating controller files...\n")
+		logger.Info("Creating controller files...")
 		writeControllerFiles(tables, paths.ControllerPath, selectedTables, pkgPath)
 	}
 	if (ORouter & mode) == ORouter {
-		ColorLog("[INFO] Creating router files...\n")
+		logger.Info("Creating router files...")
 		writeRouterFile(tables, paths.RouterPath, selectedTables, pkgPath)
 	}
 }
@@ -746,21 +744,21 @@ func writeModelFiles(tables []*Table, mPath string, selectedTables map[string]bo
 		var f *os.File
 		var err error
 		if isExist(fpath) {
-			ColorLog("[WARN] '%v' already exists. Do you want to overwrite it? [Yes|No] ", fpath)
+			logger.Warnf("'%s' already exists. Do you want to overwrite it? [Yes|No] ", fpath)
 			if askForConfirmation() {
 				f, err = os.OpenFile(fpath, os.O_RDWR|os.O_TRUNC, 0666)
 				if err != nil {
-					ColorLog("[WARN] %v\n", err)
+					logger.Warnf("%s", err)
 					continue
 				}
 			} else {
-				ColorLog("[WARN] Skipped create file '%s'\n", fpath)
+				logger.Warnf("Skipped create file '%s'", fpath)
 				continue
 			}
 		} else {
 			f, err = os.OpenFile(fpath, os.O_CREATE|os.O_RDWR, 0666)
 			if err != nil {
-				ColorLog("[WARN] %v\n", err)
+				logger.Warnf("%s", err)
 				continue
 			}
 		}
@@ -773,7 +771,8 @@ func writeModelFiles(tables []*Table, mPath string, selectedTables map[string]bo
 		fileStr := strings.Replace(template, "{{modelStruct}}", tb.String(), 1)
 		fileStr = strings.Replace(fileStr, "{{modelName}}", camelCase(tb.Name), -1)
 		fileStr = strings.Replace(fileStr, "{{tableName}}", tb.Name, -1)
-		// if table contains time field, import time.Time package
+
+		// If table contains time field, import time.Time package
 		timePkg := ""
 		importTimePkg := ""
 		if tb.ImportTimePkg {
@@ -783,8 +782,7 @@ func writeModelFiles(tables []*Table, mPath string, selectedTables map[string]bo
 		fileStr = strings.Replace(fileStr, "{{timePkg}}", timePkg, -1)
 		fileStr = strings.Replace(fileStr, "{{importTimePkg}}", importTimePkg, -1)
 		if _, err := f.WriteString(fileStr); err != nil {
-			ColorLog("[ERRO] Could not write model file to %s\n", fpath)
+			logger.Fatalf("Could not write model file to '%s': %s", fpath, err)
-			os.Exit(2)
 		}
 		CloseFile(f)
 		fmt.Fprintf(w, "\t%s%screate%s\t %s%s\n", "\x1b[32m", "\x1b[1m", "\x1b[21m", fpath, "\x1b[0m")
@@ -797,7 +795,7 @@ func writeControllerFiles(tables []*Table, cPath string, selectedTables map[stri
 	w := NewColorWriter(os.Stdout)
 
 	for _, tb := range tables {
-		// if selectedTables map is not nil and this table is not selected, ignore it
+		// If selectedTables map is not nil and this table is not selected, ignore it
 		if selectedTables != nil {
 			if _, selected := selectedTables[tb.Name]; !selected {
 				continue
@@ -811,29 +809,28 @@ func writeControllerFiles(tables []*Table, cPath string, selectedTables map[stri
 		var f *os.File
 		var err error
 		if isExist(fpath) {
-			ColorLog("[WARN] '%v' already exists. Do you want to overwrite it? [Yes|No] ", fpath)
+			logger.Warnf("'%s' already exists. Do you want to overwrite it? [Yes|No] ", fpath)
 			if askForConfirmation() {
 				f, err = os.OpenFile(fpath, os.O_RDWR|os.O_TRUNC, 0666)
 				if err != nil {
-					ColorLog("[WARN] %v\n", err)
+					logger.Warnf("%s", err)
 					continue
 				}
 			} else {
-				ColorLog("[WARN] Skipped create file '%s'\n", fpath)
+				logger.Warnf("Skipped create file '%s'", fpath)
 				continue
 			}
 		} else {
 			f, err = os.OpenFile(fpath, os.O_CREATE|os.O_RDWR, 0666)
 			if err != nil {
-				ColorLog("[WARN] %v\n", err)
+				logger.Warnf("%s", err)
 				continue
 			}
 		}
 		fileStr := strings.Replace(CtrlTPL, "{{ctrlName}}", camelCase(tb.Name), -1)
 		fileStr = strings.Replace(fileStr, "{{pkgPath}}", pkgPath, -1)
 		if _, err := f.WriteString(fileStr); err != nil {
-			ColorLog("[ERRO] Could not write controller file to %s\n", fpath)
+			logger.Fatalf("Could not write controller file to '%s': %s", fpath, err)
-			os.Exit(2)
 		}
 		CloseFile(f)
 		fmt.Fprintf(w, "\t%s%screate%s\t %s%s\n", "\x1b[32m", "\x1b[1m", "\x1b[21m", fpath, "\x1b[0m")
@@ -847,7 +844,7 @@ func writeRouterFile(tables []*Table, rPath string, selectedTables map[string]bo
 
 	var nameSpaces []string
 	for _, tb := range tables {
-		// if selectedTables map is not nil and this table is not selected, ignore it
+		// If selectedTables map is not nil and this table is not selected, ignore it
 		if selectedTables != nil {
 			if _, selected := selectedTables[tb.Name]; !selected {
 				continue
@@ -856,63 +853,44 @@ func writeRouterFile(tables []*Table, rPath string, selectedTables map[string]bo
 		if tb.Pk == "" {
 			continue
 		}
-		// add namespaces
+		// Add namespaces
 		nameSpace := strings.Replace(NamespaceTPL, "{{nameSpace}}", tb.Name, -1)
 		nameSpace = strings.Replace(nameSpace, "{{ctrlName}}", camelCase(tb.Name), -1)
 		nameSpaces = append(nameSpaces, nameSpace)
 	}
-	// add export controller
+	// Add export controller
 	fpath := path.Join(rPath, "router.go")
 	routerStr := strings.Replace(RouterTPL, "{{nameSpaces}}", strings.Join(nameSpaces, ""), 1)
 	routerStr = strings.Replace(routerStr, "{{pkgPath}}", pkgPath, 1)
 	var f *os.File
 	var err error
 	if isExist(fpath) {
-		ColorLog("[WARN] '%v' already exists. Do you want to overwrite it? [Yes|No] ", fpath)
+		logger.Warnf("'%s' already exists. Do you want to overwrite it? [Yes|No] ", fpath)
 		if askForConfirmation() {
 			f, err = os.OpenFile(fpath, os.O_RDWR|os.O_TRUNC, 0666)
 			if err != nil {
-				ColorLog("[WARN] %v\n", err)
+				logger.Warnf("%s", err)
 				return
 			}
 		} else {
-			ColorLog("[WARN] Skipped create file '%s'\n", fpath)
+			logger.Warnf("Skipped create file '%s'", fpath)
 			return
 		}
 	} else {
 		f, err = os.OpenFile(fpath, os.O_CREATE|os.O_RDWR, 0666)
 		if err != nil {
-			ColorLog("[WARN] %v\n", err)
+			logger.Warnf("%s", err)
 			return
 		}
 	}
 	if _, err := f.WriteString(routerStr); err != nil {
-		ColorLog("[ERRO] Could not write router file to '%s'\n", fpath)
+		logger.Fatalf("Could not write router file to '%s': %s", fpath, err)
-		os.Exit(2)
 	}
 	CloseFile(f)
 	fmt.Fprintf(w, "\t%s%screate%s\t %s%s\n", "\x1b[32m", "\x1b[1m", "\x1b[21m", fpath, "\x1b[0m")
 	formatSourceCode(fpath)
 }
 
-// formatSourceCode formats source files
-func formatSourceCode(filename string) {
-	cmd := exec.Command("gofmt", "-w", filename)
-	if err := cmd.Run(); err != nil {
-		ColorLog("[WARN] gofmt err: %s\n", err)
-	}
-}
-
-// camelCase converts a _ delimited string to camel case
-// e.g. very_important_person => VeryImportantPerson
-func camelCase(in string) string {
-	tokens := strings.Split(in, "_")
-	for i := range tokens {
-		tokens[i] = strings.Title(strings.Trim(tokens[i], " "))
-	}
-	return strings.Join(tokens, "")
-}
-
 func isSQLTemporalType(t string) bool {
 	return t == "date" || t == "datetime" || t == "timestamp" || t == "time"
 }
@@ -972,12 +950,12 @@ func getFileName(tbName string) (filename string) {
 
 func getPackagePath(curpath string) (packpath string) {
 	gopath := os.Getenv("GOPATH")
-	Debugf("gopath:%s", gopath)
 	if gopath == "" {
-		ColorLog("[ERRO] You should set GOPATH in the env")
+		logger.Fatal("GOPATH environment variable is not set or empty")
-		os.Exit(2)
 	}
 
+	logger.Debugf("GOPATH: %s", gopath)
+
 	appsrcpath := ""
 	haspath := false
 	wgopath := filepath.SplitList(gopath)
@@ -993,13 +971,11 @@ func getPackagePath(curpath string) (packpath string) {
 	}
 
 	if !haspath {
-		ColorLog("[ERRO] Can't generate application code outside of GOPATH '%s'\n", gopath)
+		logger.Fatalf("Cannot generate application code outside of GOPATH '%s'", gopath)
-		os.Exit(2)
 	}
 
 	if curpath == appsrcpath {
-		ColorLog("[ERRO] Can't generate application code outside of application PATH \n")
+		logger.Fatal("Cannot generate application code outside of application path")
-		os.Exit(2)
 	}
 
 	packpath = strings.Join(strings.Split(curpath[len(appsrcpath)+1:], string(filepath.Separator)), "/")

g_controllers.go

@@ -21,9 +21,6 @@ import (
 	"strings"
 )
 
-// article
-// cms/article
-//
 func generateController(cname, currpath string) {
 	w := NewColorWriter(os.Stdout)
 
@@ -36,15 +33,14 @@ func generateController(cname, currpath string) {
 		packageName = p[i+1 : len(p)-1]
 	}
 
-	ColorLog("[INFO] Using '%s' as controller name\n", controllerName)
+	logger.Infof("Using '%s' as controller name", controllerName)
-	ColorLog("[INFO] Using '%s' as package name\n", packageName)
+	logger.Infof("Using '%s' as package name", packageName)
 
 	fp := path.Join(currpath, "controllers", p)
 	if _, err := os.Stat(fp); os.IsNotExist(err) {
 		// Create the controller's directory
 		if err := os.MkdirAll(fp, 0777); err != nil {
-			ColorLog("[ERRO] Could not create controllers directory: %s\n", err)
+			logger.Fatalf("Could not create controllers directory: %s", err)
-			os.Exit(2)
 		}
 	}
 
@@ -56,7 +52,7 @@ func generateController(cname, currpath string) {
 
 		var content string
 		if _, err := os.Stat(modelPath); err == nil {
-			ColorLog("[INFO] Using matching model '%s'\n", controllerName)
+			logger.Infof("Using matching model '%s'", controllerName)
 			content = strings.Replace(controllerModelTpl, "{{packageName}}", packageName, -1)
 			pkgPath := getPackagePath(currpath)
 			content = strings.Replace(content, "{{pkgPath}}", pkgPath, -1)
@@ -71,8 +67,7 @@ func generateController(cname, currpath string) {
 		formatSourceCode(fpath)
 		fmt.Fprintf(w, "\t%s%screate%s\t %s%s\n", "\x1b[32m", "\x1b[1m", "\x1b[21m", fpath, "\x1b[0m")
 	} else {
-		ColorLog("[ERRO] Could not create controller file: %s\n", err)
+		logger.Fatalf("Could not create controller file: %s", err)
-		os.Exit(2)
 	}
 }
 

g_docs.go

@@ -26,7 +26,6 @@ import (
 	"path/filepath"
 	"reflect"
 	"regexp"
-	"runtime"
 	"strconv"
 	"strings"
 	"unicode"
@@ -92,8 +91,7 @@ func parsePackagesFromDir(path string) {
 	parsePackageFromDir(path)
 	list, err := ioutil.ReadDir(path)
 	if err != nil {
-		ColorLog("[ERRO] Can't read directory %s : %s\n", path, err)
+		logger.Fatalf("Cannot read directory '%s': %s", path, err)
-		os.Exit(1)
 	}
 	for _, item := range list {
 		if item.IsDir() && item.Name() != "vendor" {
@@ -108,11 +106,10 @@ func parsePackageFromDir(path string) {
 		name := info.Name()
 		return !info.IsDir() && !strings.HasPrefix(name, ".") && strings.HasSuffix(name, ".go")
 	}, parser.ParseComments)
-
 	if err != nil {
-		ColorLog("[ERRO] the model %s parser.ParseDir error: %s\n", path, err)
+		logger.Fatalf("Error while parsing dir at '%s': %s", path, err)
-		os.Exit(1)
 	}
+
 	for k, v := range folderPkgs {
 		astPkgs[k] = v
 	}
@@ -124,13 +121,13 @@ func generateDocs(curpath string) {
 	f, err := parser.ParseFile(fset, path.Join(curpath, "routers", "router.go"), nil, parser.ParseComments)
 
 	if err != nil {
-		ColorLog("[ERRO] parse router.go error\n")
+		logger.Fatalf("Error while parsing router.go: %s", err)
-		os.Exit(2)
 	}
 
 	rootapi.Infos = swagger.Information{}
 	rootapi.SwaggerVersion = "2.0"
-	//analysis API comments
+
+	// Analyse API comments
 	if f.Comments != nil {
 		for _, c := range f.Comments {
 			for _, s := range strings.Split(c.Text(), "\n") {
@@ -168,13 +165,14 @@ func generateDocs(curpath string) {
 			}
 		}
 	}
-	// analisys controller package
+
+	// Analyse controller package
 	for _, im := range f.Imports {
 		localName := ""
 		if im.Name != nil {
 			localName = im.Name.Name
 		}
-		analisyscontrollerPkg(localName, im.Path.Value)
+		analyseControllerPkg(localName, im.Path.Value)
 	}
 	for _, d := range f.Decls {
 		switch specDecl := d.(type) {
@@ -184,11 +182,11 @@ func generateDocs(curpath string) {
 				case *ast.AssignStmt:
 					for _, l := range stmt.Rhs {
 						if v, ok := l.(*ast.CallExpr); ok {
-							// analisys NewNamespace, it will return version and the subfunction
+							// Analyse NewNamespace, it will return version and the subfunction
 							if selName := v.Fun.(*ast.SelectorExpr).Sel.String(); selName != "NewNamespace" {
 								continue
 							}
-							version, params := analisysNewNamespace(v)
+							version, params := analyseNewNamespace(v)
 							if rootapi.BasePath == "" && version != "" {
 								rootapi.BasePath = version
 							}
@@ -197,12 +195,12 @@ func generateDocs(curpath string) {
 								case *ast.CallExpr:
 									controllerName := ""
 									if selname := pp.Fun.(*ast.SelectorExpr).Sel.String(); selname == "NSNamespace" {
-										s, params := analisysNewNamespace(pp)
+										s, params := analyseNewNamespace(pp)
 										for _, sp := range params {
 											switch pp := sp.(type) {
 											case *ast.CallExpr:
 												if pp.Fun.(*ast.SelectorExpr).Sel.String() == "NSInclude" {
-													controllerName = analisysNSInclude(s, pp)
+													controllerName = analyseNSInclude(s, pp)
 													if v, ok := controllerComments[controllerName]; ok {
 														rootapi.Tags = append(rootapi.Tags, swagger.Tag{
 															Name:        strings.Trim(s, "/"),
@@ -213,7 +211,7 @@ func generateDocs(curpath string) {
 											}
 										}
 									} else if selname == "NSInclude" {
-										controllerName = analisysNSInclude("", pp)
+										controllerName = analyseNSInclude("", pp)
 										if v, ok := controllerComments[controllerName]; ok {
 											rootapi.Tags = append(rootapi.Tags, swagger.Tag{
 												Name:        controllerName, // if the NSInclude has no prefix, we use the controllername as the tag
@@ -250,8 +248,8 @@ func generateDocs(curpath string) {
 	}
 }
 
-// return version and the others params
+// analyseNewNamespace returns version and the others params
-func analisysNewNamespace(ce *ast.CallExpr) (first string, others []ast.Expr) {
+func analyseNewNamespace(ce *ast.CallExpr) (first string, others []ast.Expr) {
 	for i, p := range ce.Args {
 		if i == 0 {
 			switch pp := p.(type) {
@@ -265,7 +263,7 @@ func analisysNewNamespace(ce *ast.CallExpr) (first string, others []ast.Expr) {
 	return
 }
 
-func analisysNSInclude(baseurl string, ce *ast.CallExpr) string {
+func analyseNSInclude(baseurl string, ce *ast.CallExpr) string {
 	cname := ""
 	for _, p := range ce.Args {
 		x := p.(*ast.UnaryExpr).X.(*ast.CompositeLit).Type.(*ast.SelectorExpr)
@@ -313,7 +311,7 @@ func analisysNSInclude(baseurl string, ce *ast.CallExpr) string {
 	return cname
 }
 
-func analisyscontrollerPkg(localName, pkgpath string) {
+func analyseControllerPkg(localName, pkgpath string) {
 	pkgpath = strings.Trim(pkgpath, "\"")
 	if isSystemPackage(pkgpath) {
 		return
@@ -329,7 +327,7 @@ func analisyscontrollerPkg(localName, pkgpath string) {
 	}
 	gopath := os.Getenv("GOPATH")
 	if gopath == "" {
-		panic("please set gopath")
+		logger.Fatal("GOPATH environment variable is not set or empty")
 	}
 	pkgRealpath := ""
 
@@ -347,18 +345,16 @@ func analisyscontrollerPkg(localName, pkgpath string) {
 		}
 		pkgCache[pkgpath] = struct{}{}
 	} else {
-		ColorLog("[ERRO] the %s pkg not exist in gopath\n", pkgpath)
+		logger.Fatalf("Package '%s' does not exist in the GOPATH", pkgpath)
-		os.Exit(1)
 	}
+
 	fileSet := token.NewFileSet()
 	astPkgs, err := parser.ParseDir(fileSet, pkgRealpath, func(info os.FileInfo) bool {
 		name := info.Name()
 		return !info.IsDir() && !strings.HasPrefix(name, ".") && strings.HasSuffix(name, ".go")
 	}, parser.ParseComments)
-
 	if err != nil {
-		ColorLog("[ERRO] the %s pkg parser.ParseDir error: %s\n", pkgpath, err)
+		logger.Fatalf("Error while parsing dir at '%s': %s", pkgpath, err)
-		os.Exit(1)
 	}
 	for _, pkg := range astPkgs {
 		for _, fl := range pkg.Files {
@@ -367,7 +363,7 @@ func analisyscontrollerPkg(localName, pkgpath string) {
 				case *ast.FuncDecl:
 					if specDecl.Recv != nil && len(specDecl.Recv.List) > 0 {
 						if t, ok := specDecl.Recv.List[0].Type.(*ast.StarExpr); ok {
-							// parse controller method
+							// Parse controller method
 							parserComments(specDecl.Doc, specDecl.Name.String(), fmt.Sprint(t.X), pkgpath)
 						}
 					}
@@ -377,7 +373,7 @@ func analisyscontrollerPkg(localName, pkgpath string) {
 							switch tp := s.(*ast.TypeSpec).Type.(type) {
 							case *ast.StructType:
 								_ = tp.Struct
-								//parse controller definition comments
+								// Parse controller definition comments
 								if strings.TrimSpace(specDecl.Doc.Text()) != "" {
 									controllerComments[pkgpath+s.(*ast.TypeSpec).Name.String()] = specDecl.Doc.Text()
 								}
@@ -391,10 +387,11 @@ func analisyscontrollerPkg(localName, pkgpath string) {
 }
 
 func isSystemPackage(pkgpath string) bool {
-	goroot := runtime.GOROOT()
+	goroot := os.Getenv("GOROOT")
 	if goroot == "" {
-		panic("goroot is empty, do you install Go right?")
+		logger.Fatalf("GOROOT environment variable is not set or empty")
 	}
+
 	wg, _ := filepath.EvalSymlinks(filepath.Join(goroot, "src", "pkg", pkgpath))
 	if utils.FileExists(wg) {
 		return true
@@ -460,8 +457,7 @@ func parserComments(comments *ast.CommentGroup, funcName, controllerName, pkgpat
 					ss = strings.TrimSpace(ss[pos:])
 					schemaName, pos := peekNextSplitString(ss)
 					if schemaName == "" {
-						ColorLog("[ERRO][%s.%s] Schema must follow {object} or {array}\n", controllerName, funcName)
+						logger.Fatalf("[%s.%s] Schema must follow {object} or {array}", controllerName, funcName)
-						os.Exit(-1)
 					}
 					if strings.HasPrefix(schemaName, "[]") {
 						schemaName = schemaName[2:]
@@ -498,7 +494,7 @@ func parserComments(comments *ast.CommentGroup, funcName, controllerName, pkgpat
 				para := swagger.Parameter{}
 				p := getparams(strings.TrimSpace(t[len("@Param "):]))
 				if len(p) < 4 {
-					panic(controllerName + "_" + funcName + "'s comments @Param at least should has 4 params")
+					logger.Fatal(controllerName + "_" + funcName + "'s comments @Param should have at least 4 params")
 				}
 				para.Name = p[0]
 				switch p[1] {
@@ -513,7 +509,7 @@ func parserComments(comments *ast.CommentGroup, funcName, controllerName, pkgpat
 				case "body":
 					break
 				default:
-					ColorLog("[WARN][%s.%s] Unknow param location: %s, Possible values are `query`, `header`, `path`, `formData` or `body`.\n", controllerName, funcName, p[1])
+					logger.Warnf("[%s.%s] Unknown param location: %s. Possible values are `query`, `header`, `path`, `formData` or `body`.\n", controllerName, funcName, p[1])
 				}
 				para.In = p[1]
 				pp := strings.Split(p[2], ".")
@@ -544,7 +540,7 @@ func parserComments(comments *ast.CommentGroup, funcName, controllerName, pkgpat
 						paraType = typeFormat[0]
 						paraFormat = typeFormat[1]
 					} else {
-						ColorLog("[WARN][%s.%s] Unknow param type: %s\n", controllerName, funcName, typ)
+						logger.Warnf("[%s.%s] Unknown param type: %s\n", controllerName, funcName, typ)
 					}
 					if isArray {
 						para.Type = "array"
@@ -697,7 +693,7 @@ func getModel(str string) (objectname string, m swagger.Schema, realTypes []stri
 		}
 	}
 	if m.Title == "" {
-		ColorLog("[WARN]can't find the object: %s\n", str)
+		logger.Warnf("Cannot find the object: %s", str)
 		// TODO remove when all type have been supported
 		//os.Exit(1)
 	}
@@ -712,8 +708,7 @@ func getModel(str string) (objectname string, m swagger.Schema, realTypes []stri
 func parseObject(d *ast.Object, k string, m *swagger.Schema, realTypes *[]string, astPkgs map[string]*ast.Package, packageName string) {
 	ts, ok := d.Decl.(*ast.TypeSpec)
 	if !ok {
-		ColorLog("Unknown type without TypeSec: %v\n", d)
+		logger.Fatalf("Unknown type without TypeSec: %v\n", d)
-		os.Exit(1)
 	}
 	// TODO support other types, such as `ArrayType`, `MapType`, `InterfaceType` etc...
 	st, ok := ts.Type.(*ast.StructType)
@@ -789,7 +784,7 @@ func parseObject(d *ast.Object, k string, m *swagger.Schema, realTypes *[]string
 						mp.Default = str2RealType(res[1], realType)
 
 					} else {
-						ColorLog("[WARN] Invalid default value: %s\n", defaultValue)
+						logger.Warnf("Invalid default value: %s", defaultValue)
 					}
 				}
 
@@ -933,7 +928,7 @@ func str2RealType(s string, typ string) interface{} {
 	}
 
 	if err != nil {
-		ColorLog("[WARN] Invalid default value type(%s): %s\n", typ, s)
+		logger.Warnf("Invalid default value type '%s': %s", typ, s)
 		return s
 	}
 

g_hproseappcode.go

@@ -38,9 +38,7 @@ func generateHproseAppcode(driver, connStr, level, tables, currpath string) {
 	case "3":
 		mode = OModel | OController | ORouter
 	default:
-		ColorLog("[ERRO] Invalid 'level' option: %s\n", level)
+		logger.Fatal("Invalid 'level' option. Level must be either \"1\", \"2\" or \"3\"")
-		ColorLog("[HINT] Level must be either 1, 2 or 3\n")
-		os.Exit(2)
 	}
 	var selectedTables map[string]bool
 	if tables != "" {
@@ -53,12 +51,9 @@ func generateHproseAppcode(driver, connStr, level, tables, currpath string) {
 	case "mysql":
 	case "postgres":
 	case "sqlite":
-		ColorLog("[ERRO] Generating app code from SQLite database is not supported yet.\n")
+		logger.Fatal("Generating app code from SQLite database is not supported yet")
-		os.Exit(2)
 	default:
-		ColorLog("[ERRO] Unknown database driver: %s\n", driver)
+		logger.Fatalf("Unknown database driver '%s'. Driver must be one of mysql, postgres or sqlite", driver)
-		ColorLog("[HINT] Driver must be one of mysql, postgres or sqlite\n")
-		os.Exit(2)
 	}
 	genHprose(driver, connStr, mode, selectedTables, currpath)
 }
@@ -68,12 +63,11 @@ func generateHproseAppcode(driver, connStr, level, tables, currpath string) {
 func genHprose(dbms, connStr string, mode byte, selectedTableNames map[string]bool, currpath string) {
 	db, err := sql.Open(dbms, connStr)
 	if err != nil {
-		ColorLog("[ERRO] Could not connect to %s database: %s, %s\n", dbms, connStr, err)
+		logger.Fatalf("Could not connect to '%s' database using '%s': %s", dbms, connStr, err)
-		os.Exit(2)
 	}
 	defer db.Close()
 	if trans, ok := dbDriver[dbms]; ok {
-		ColorLog("[INFO] Analyzing database tables...\n")
+		logger.Info("Analyzing database tables...")
 		tableNames := trans.GetTableNames(db)
 		tables := getTableObjects(tableNames, db, trans)
 		mvcPath := new(MvcPath)
@@ -82,8 +76,7 @@ func genHprose(dbms, connStr string, mode byte, selectedTableNames map[string]bo
 		pkgPath := getPackagePath(currpath)
 		writeHproseSourceFiles(pkgPath, tables, mode, mvcPath, selectedTableNames)
 	} else {
-		ColorLog("[ERRO] Generating app code from %s database is not supported yet.\n", dbms)
+		logger.Fatalf("Generating app code from '%s' database is not supported yet", dbms)
-		os.Exit(2)
 	}
 }
 
@@ -92,7 +85,7 @@ func genHprose(dbms, connStr string, mode byte, selectedTableNames map[string]bo
 // Newly geneated files will be inside these folders.
 func writeHproseSourceFiles(pkgPath string, tables []*Table, mode byte, paths *MvcPath, selectedTables map[string]bool) {
 	if (OModel & mode) == OModel {
-		ColorLog("[INFO] Creating model files...\n")
+		logger.Info("Creating model files...")
 		writeHproseModelFiles(tables, paths.ModelPath, selectedTables)
 	}
 }
@@ -113,21 +106,21 @@ func writeHproseModelFiles(tables []*Table, mPath string, selectedTables map[str
 		var f *os.File
 		var err error
 		if isExist(fpath) {
-			ColorLog("[WARN] '%v' already exists. Do you want to overwrite it? [Yes|No] ", fpath)
+			logger.Warnf("'%s' already exists. Do you want to overwrite it? [Yes|No] ", fpath)
 			if askForConfirmation() {
 				f, err = os.OpenFile(fpath, os.O_RDWR|os.O_TRUNC, 0666)
 				if err != nil {
-					ColorLog("[WARN] %v\n", err)
+					logger.Warnf("%s", err)
 					continue
 				}
 			} else {
-				ColorLog("[WARN] Skipped create file '%s'\n", fpath)
+				logger.Warnf("Skipped create file '%s'", fpath)
 				continue
 			}
 		} else {
 			f, err = os.OpenFile(fpath, os.O_CREATE|os.O_RDWR, 0666)
 			if err != nil {
-				ColorLog("[WARN] %v\n", err)
+				logger.Warnf("%s", err)
 				continue
 			}
 		}
@@ -150,8 +143,7 @@ func writeHproseModelFiles(tables []*Table, mPath string, selectedTables map[str
 		fileStr = strings.Replace(fileStr, "{{timePkg}}", timePkg, -1)
 		fileStr = strings.Replace(fileStr, "{{importTimePkg}}", importTimePkg, -1)
 		if _, err := f.WriteString(fileStr); err != nil {
-			ColorLog("[ERRO] Could not write model file to '%s'\n", fpath)
+			logger.Fatalf("Could not write model file to '%s'", fpath)
-			os.Exit(2)
 		}
 		CloseFile(f)
 		fmt.Fprintf(w, "\t%s%screate%s\t %s%s\n", "\x1b[32m", "\x1b[1m", "\x1b[21m", fpath, "\x1b[0m")

g_migration.go

@@ -51,12 +51,12 @@ func (m mysqlDriver) generateSQLFromFields(fields string) string {
 	for i, v := range fds {
 		kv := strings.SplitN(v, ":", 2)
 		if len(kv) != 2 {
-			ColorLog("[ERRO] Fields format is wrong. Should be: key:type,key:type " + v + "\n")
+			logger.Error("Fields format is wrong. Should be: key:type,key:type " + v)
 			return ""
 		}
 		typ, tag := m.getSQLType(kv[1])
 		if typ == "" {
-			ColorLog("[ERRO] Fields format is wrong. Should be: key:type,key:type " + v + "\n")
+			logger.Error("Fields format is wrong. Should be: key:type,key:type " + v)
 			return ""
 		}
 		if i == 0 && strings.ToLower(kv[0]) != "id" {
@@ -120,12 +120,12 @@ func (m postgresqlDriver) generateSQLFromFields(fields string) string {
 	for i, v := range fds {
 		kv := strings.SplitN(v, ":", 2)
 		if len(kv) != 2 {
-			ColorLog("[ERRO] Fields format is wrong. Should be: key:type,key:type " + v + "\n")
+			logger.Error("Fields format is wrong. Should be: key:type,key:type " + v)
 			return ""
 		}
 		typ, tag := m.getSQLType(kv[1])
 		if typ == "" {
-			ColorLog("[ERRO] Fields format is wrong. Should be: key:type,key:type " + v + "\n")
+			logger.Error("Fields format is wrong. Should be: key:type,key:type " + v)
 			return ""
 		}
 		if i == 0 && strings.ToLower(kv[0]) != "id" {
@@ -177,7 +177,8 @@ func newDBDriver() DBDriver {
 	case "postgres":
 		return postgresqlDriver{}
 	default:
-		panic("driver not supported")
+		logger.Fatal("Driver not supported")
+		return nil
 	}
 }
 
@@ -190,8 +191,7 @@ func generateMigration(mname, upsql, downsql, curpath string) {
 	if _, err := os.Stat(migrationFilePath); os.IsNotExist(err) {
 		// create migrations directory
 		if err := os.MkdirAll(migrationFilePath, 0777); err != nil {
-			ColorLog("[ERRO] Could not create migration directory: %s\n", err)
+			logger.Fatalf("Could not create migration directory: %s", err)
-			os.Exit(2)
 		}
 	}
 	// create file
@@ -208,8 +208,7 @@ func generateMigration(mname, upsql, downsql, curpath string) {
 		formatSourceCode(fpath)
 		fmt.Fprintf(w, "\t%s%screate%s\t %s%s\n", "\x1b[32m", "\x1b[1m", "\x1b[21m", fpath, "\x1b[0m")
 	} else {
-		ColorLog("[ERRO] Could not create migration file: %s\n", err)
+		logger.Fatalf("Could not create migration file: %s", err)
-		os.Exit(2)
 	}
 }
 

g_model.go

@@ -35,19 +35,17 @@ func generateModel(mname, fields, currpath string) {
 
 	modelStruct, hastime, err := getStruct(modelName, fields)
 	if err != nil {
-		ColorLog("[ERRO] Could not generate the model struct: %s\n", err)
+		logger.Fatalf("Could not generate the model struct: %s", err)
-		os.Exit(2)
 	}
 
-	ColorLog("[INFO] Using '%s' as model name\n", modelName)
+	logger.Infof("Using '%s' as model name", modelName)
-	ColorLog("[INFO] Using '%s' as package name\n", packageName)
+	logger.Infof("Using '%s' as package name", packageName)
 
 	fp := path.Join(currpath, "models", p)
 	if _, err := os.Stat(fp); os.IsNotExist(err) {
 		// Create the model's directory
 		if err := os.MkdirAll(fp, 0777); err != nil {
-			ColorLog("[ERRO] Could not create the model directory: %s\n", err)
+			logger.Fatalf("Could not create the model directory: %s", err)
-			os.Exit(2)
 		}
 	}
 
@@ -67,8 +65,7 @@ func generateModel(mname, fields, currpath string) {
 		formatSourceCode(fpath)
 		fmt.Fprintf(w, "\t%s%screate%s\t %s%s\n", "\x1b[32m", "\x1b[1m", "\x1b[21m", fpath, "\x1b[0m")
 	} else {
-		ColorLog("[ERRO] Could not create model file: %s\n", err)
+		logger.Fatalf("Could not create model file: %s", err)
-		os.Exit(2)
 	}
 }
 

g_scaffold.go

@@ -3,7 +3,7 @@ package main
 import "strings"
 
 func generateScaffold(sname, fields, currpath, driver, conn string) {
-	ColorLog("[INFO] Do you want to create a '%v' model? [Yes|No] ", sname)
+	logger.Infof("Do you want to create a '%s' model? [Yes|No] ", sname)
 
 	// Generate the model
 	if askForConfirmation() {
@@ -11,19 +11,19 @@ func generateScaffold(sname, fields, currpath, driver, conn string) {
 	}
 
 	// Generate the controller
-	ColorLog("[INFO] Do you want to create a '%v' controller? [Yes|No] ", sname)
+	logger.Infof("Do you want to create a '%s' controller? [Yes|No] ", sname)
 	if askForConfirmation() {
 		generateController(sname, currpath)
 	}
 
 	// Generate the views
-	ColorLog("[INFO] Do you want to create views for this '%v' resource? [Yes|No] ", sname)
+	logger.Infof("Do you want to create views for this '%s' resource? [Yes|No] ", sname)
 	if askForConfirmation() {
 		generateView(sname, currpath)
 	}
 
 	// Generate a migration
-	ColorLog("[INFO] Do you want to create a '%v' migration and schema for this resource? [Yes|No] ", sname)
+	logger.Infof("Do you want to create a '%s' migration and schema for this resource? [Yes|No] ", sname)
 	if askForConfirmation() {
 		upsql := ""
 		downsql := ""
@@ -40,9 +40,9 @@ func generateScaffold(sname, fields, currpath, driver, conn string) {
 	}
 
 	// Run the migration
-	ColorLog("[INFO] Do you want to migrate the database? [Yes|No] ")
+	logger.Infof("Do you want to migrate the database? [Yes|No] ")
 	if askForConfirmation() {
 		migrateUpdate(currpath, driver, conn)
 	}
-	ColorLog("[INFO] All done! Don't forget to add  beego.Router(\"/%v\" ,&controllers.%vController{}) to routers/route.go\n", sname, strings.Title(sname))
+	logger.Successf("All done! Don't forget to add  beego.Router(\"/%s\" ,&controllers.%sController{}) to routers/route.go\n", sname, strings.Title(sname))
 }

g_views.go

@@ -25,13 +25,12 @@ import (
 func generateView(viewpath, currpath string) {
 	w := NewColorWriter(os.Stdout)
 
-	ColorLog("[INFO] Generating view...\n")
+	logger.Info("Generating view...")
 
 	absViewPath := path.Join(currpath, "views", viewpath)
 	err := os.MkdirAll(absViewPath, os.ModePerm)
 	if err != nil {
-		ColorLog("[ERRO] Could not create '%s' view: %s\n", viewpath, err)
+		logger.Fatalf("Could not create '%s' view: %s", viewpath, err)
-		os.Exit(2)
 	}
 
 	cfile := path.Join(absViewPath, "index.tpl")
@@ -40,8 +39,7 @@ func generateView(viewpath, currpath string) {
 		f.WriteString(cfile)
 		fmt.Fprintf(w, "\t%s%screate%s\t %s%s\n", "\x1b[32m", "\x1b[1m", "\x1b[21m", cfile, "\x1b[0m")
 	} else {
-		ColorLog("[ERRO] Could not create view file: %s\n", err)
+		logger.Fatalf("Could not create view file: %s", err)
-		os.Exit(2)
 	}
 
 	cfile = path.Join(absViewPath, "show.tpl")
@@ -50,8 +48,7 @@ func generateView(viewpath, currpath string) {
 		f.WriteString(cfile)
 		fmt.Fprintf(w, "\t%s%screate%s\t %s%s\n", "\x1b[32m", "\x1b[1m", "\x1b[21m", cfile, "\x1b[0m")
 	} else {
-		ColorLog("[ERRO] Could not create view file: %s\n", err)
+		logger.Fatalf("Could not create view file: %s", err)
-		os.Exit(2)
 	}
 
 	cfile = path.Join(absViewPath, "create.tpl")
@@ -60,8 +57,7 @@ func generateView(viewpath, currpath string) {
 		f.WriteString(cfile)
 		fmt.Fprintf(w, "\t%s%screate%s\t %s%s\n", "\x1b[32m", "\x1b[1m", "\x1b[21m", cfile, "\x1b[0m")
 	} else {
-		ColorLog("[ERRO] Could not create view file: %s\n", err)
+		logger.Fatalf("Could not create view file: %s", err)
-		os.Exit(2)
 	}
 
 	cfile = path.Join(absViewPath, "edit.tpl")
@@ -70,7 +66,6 @@ func generateView(viewpath, currpath string) {
 		f.WriteString(cfile)
 		fmt.Fprintf(w, "\t%s%screate%s\t %s%s\n", "\x1b[32m", "\x1b[1m", "\x1b[21m", cfile, "\x1b[0m")
 	} else {
-		ColorLog("[ERRO] Could not create view file: %s\n", err)
+		logger.Fatalf("Could not create view file: %s", err)
-		os.Exit(2)
 	}
 }

hproseapp.go

@@ -314,8 +314,7 @@ func createhprose(cmd *Command, args []string) int {
 	}
 	apppath, packpath, err := checkEnv(args[0])
 	if err != nil {
-		fmt.Println(err)
+		logger.Fatalf("%s", err)
-		os.Exit(2)
 	}
 	if driver == "" {
 		driver = "mysql"
@@ -323,7 +322,7 @@ func createhprose(cmd *Command, args []string) int {
 	if conn == "" {
 	}
 
-	ColorLog("[INFO] Creating Hprose application...\n")
+	logger.Info("Creating Hprose application...")
 
 	os.MkdirAll(apppath, 0755)
 	fmt.Fprintf(w, "\t%s%screate%s\t %s%s\n", "\x1b[32m", "\x1b[1m", "\x1b[21m", apppath, "\x1b[0m")
@@ -334,9 +333,9 @@ func createhprose(cmd *Command, args []string) int {
 		strings.Replace(hproseconf, "{{.Appname}}", args[0], -1))
 
 	if conn != "" {
-		ColorLog("[INFO] Using '%s' as 'driver'\n", driver)
+		logger.Infof("Using '%s' as 'driver'", driver)
-		ColorLog("[INFO] Using '%s' as 'conn'\n", conn)
+		logger.Infof("Using '%s' as 'conn'", conn)
-		ColorLog("[INFO] Using '%s' as 'tables'\n", tables)
+		logger.Infof("Using '%s' as 'tables'", tables)
 		generateHproseAppcode(string(driver), string(conn), "1", string(tables), path.Join(curpath, args[0]))
 		fmt.Fprintf(w, "\t%s%screate%s\t %s%s\n", "\x1b[32m", "\x1b[1m", "\x1b[21m", path.Join(apppath, "main.go"), "\x1b[0m")
 		maingoContent := strings.Replace(hproseMainconngo, "{{.Appname}}", packpath, -1)
@@ -369,6 +368,6 @@ func createhprose(cmd *Command, args []string) int {
 		WriteToFile(path.Join(apppath, "main.go"),
 			strings.Replace(hproseMaingo, "{{.Appname}}", packpath, -1))
 	}
-	ColorLog("[SUCC] New Hprose application successfully created!\n")
+	logger.Success("New Hprose application successfully created!")
 	return 0
 }

logger.go

@@ -0,0 +1,260 @@
+// Copyright 2013 bee authors
+//
+// 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 main
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"runtime"
+	"sync"
+	"sync/atomic"
+	"text/template"
+)
+
+var errInvalidLogLevel = errors.New("logger: invalid log level")
+
+const (
+	levelCritical = iota
+	levelFatal
+	levelSuccess
+	levelHint
+	levelDebug
+	levelInfo
+	levelWarn
+	levelError
+)
+
+var (
+	sequenceNo uint64
+	logger     *BeeLogger
+)
+
+// BeeLogger logs logging records to the specified io.Writer
+type BeeLogger struct {
+	mu     sync.Mutex
+	output io.Writer
+}
+
+// LogRecord represents a log record and contains the timestamp when the record
+// was created, an increasing id, level and the actual formatted log line.
+type LogRecord struct {
+	ID       string
+	Level    string
+	Message  string
+	Filename string
+	LineNo   int
+}
+
+var (
+	logRecordTemplate      *template.Template
+	debugLogRecordTemplate *template.Template
+	debugLogFormat         string
+)
+
+func init() {
+	var (
+		err             error
+		simpleLogFormat = `{{Now "2006/01/02 15:04:05"}} {{.Level}} ▶ {{.ID}} {{.Message}}{{EndLine}}`
+		debugLogFormat  = `{{Now "2006/01/02 15:04:05"}} {{.Level}} ▶ {{.ID}} {{.Filename}}:{{.LineNo}} {{.Message}}{{EndLine}}`
+	)
+
+	// Initialize and parse logging templates
+	funcs := template.FuncMap{
+		"Now":     Now,
+		"EndLine": EndLine,
+	}
+	logRecordTemplate, err = template.New("logRecordTemplate").Funcs(funcs).Parse(simpleLogFormat)
+	MustCheck(err)
+	debugLogRecordTemplate, err = template.New("dbgLogRecordTemplate").Funcs(funcs).Parse(debugLogFormat)
+	MustCheck(err)
+
+	// Initialize the logger instance with a NewColorWriter output
+	logger = &BeeLogger{output: NewColorWriter(os.Stdout)}
+}
+
+// SetOutput sets the logger output destination
+func (l *BeeLogger) SetOutput(w io.Writer) {
+	l.mu.Lock()
+	defer l.mu.Unlock()
+	l.output = NewColorWriter(w)
+}
+
+func (l *BeeLogger) getLevelTag(level int) string {
+	switch level {
+	case levelFatal:
+		return "FATAL   "
+	case levelSuccess:
+		return "SUCCESS "
+	case levelHint:
+		return "HINT    "
+	case levelDebug:
+		return "DEBUG   "
+	case levelInfo:
+		return "INFO    "
+	case levelWarn:
+		return "WARN    "
+	case levelError:
+		return "ERROR   "
+	case levelCritical:
+		return "CRITICAL"
+	default:
+		panic(errInvalidLogLevel)
+	}
+}
+
+func (l *BeeLogger) getColorLevel(level int) string {
+	switch level {
+	case levelCritical:
+		return RedBold(l.getLevelTag(level))
+	case levelFatal:
+		return RedBold(l.getLevelTag(level))
+	case levelInfo:
+		return BlueBold(l.getLevelTag(level))
+	case levelHint:
+		return CyanBold(l.getLevelTag(level))
+	case levelDebug:
+		return YellowBold(l.getLevelTag(level))
+	case levelError:
+		return RedBold(l.getLevelTag(level))
+	case levelWarn:
+		return YellowBold(l.getLevelTag(level))
+	case levelSuccess:
+		return GreenBold(l.getLevelTag(level))
+	default:
+		panic(errInvalidLogLevel)
+	}
+}
+
+// mustLog logs the message according to the specified level and arguments.
+// It panics in case of an error.
+func (l *BeeLogger) mustLog(level int, message string, args ...interface{}) {
+	// Create the logging record and pass into the output
+	record := LogRecord{
+		ID:      fmt.Sprintf("%04d", atomic.AddUint64(&sequenceNo, 1)),
+		Level:   l.getColorLevel(level),
+		Message: fmt.Sprintf(message, args...),
+	}
+
+	err := logRecordTemplate.Execute(l.output, record)
+	MustCheck(err)
+}
+
+// mustLogDebug logs a debug message only if debug mode
+// is enabled. i.e. DEBUG_ENABLED="1"
+func (l *BeeLogger) mustLogDebug(message string, args ...interface{}) {
+	if !IsDebugEnabled() {
+		return
+	}
+
+	// Change the output to Stderr
+	l.SetOutput(os.Stderr)
+
+	// Create the log record and Get the filename
+	// and the line number of the caller
+	_, file, line, _ := runtime.Caller(1)
+	record := LogRecord{
+		ID:       fmt.Sprintf("%04d", atomic.AddUint64(&sequenceNo, 1)),
+		Level:    l.getColorLevel(levelDebug),
+		Message:  fmt.Sprintf(message, args...),
+		LineNo:   line,
+		Filename: filepath.Base(file),
+	}
+	err := debugLogRecordTemplate.Execute(l.output, record)
+	MustCheck(err)
+}
+
+// Debug outputs a debug log message
+func (l *BeeLogger) Debug(message string) {
+	l.mustLogDebug(message)
+}
+
+// Debugf outputs a formatted debug log message
+func (l *BeeLogger) Debugf(message string, vars ...interface{}) {
+	l.mustLogDebug(message, vars...)
+}
+
+// Info outputs an information log message
+func (l *BeeLogger) Info(message string) {
+	l.mustLog(levelInfo, message)
+}
+
+// Infof outputs a formatted information log message
+func (l *BeeLogger) Infof(message string, vars ...interface{}) {
+	l.mustLog(levelInfo, message, vars...)
+}
+
+// Warn outputs a warning log message
+func (l *BeeLogger) Warn(message string) {
+	l.mustLog(levelWarn, message)
+}
+
+// Warnf outputs a formatted warning log message
+func (l *BeeLogger) Warnf(message string, vars ...interface{}) {
+	l.mustLog(levelWarn, message, vars...)
+}
+
+// Error outputs an error log message
+func (l *BeeLogger) Error(message string) {
+	l.mustLog(levelError, message)
+}
+
+// Errorf outputs a formatted error log message
+func (l *BeeLogger) Errorf(message string, vars ...interface{}) {
+	l.mustLog(levelError, message, vars...)
+}
+
+// Fatal outputs a fatal log message and exists
+func (l *BeeLogger) Fatal(message string) {
+	l.mustLog(levelFatal, message)
+	os.Exit(255)
+}
+
+// Fatalf outputs a formatted log message and exists
+func (l *BeeLogger) Fatalf(message string, vars ...interface{}) {
+	l.mustLog(levelFatal, message, vars...)
+	os.Exit(255)
+}
+
+// Success outputs a success log message
+func (l *BeeLogger) Success(message string) {
+	l.mustLog(levelSuccess, message)
+}
+
+// Successf outputs a formatted success log message
+func (l *BeeLogger) Successf(message string, vars ...interface{}) {
+	l.mustLog(levelSuccess, message, vars...)
+}
+
+// Hint outputs a hint log message
+func (l *BeeLogger) Hint(message string) {
+	l.mustLog(levelHint, message)
+}
+
+// Hintf outputs a formatted hint log message
+func (l *BeeLogger) Hintf(message string, vars ...interface{}) {
+	l.mustLog(levelHint, message, vars...)
+}
+
+// Critical outputs a critical log message
+func (l *BeeLogger) Critical(message string) {
+	l.mustLog(levelCritical, message)
+}
+
+// Criticalf outputs a formatted critical log message
+func (l *BeeLogger) Criticalf(message string, vars ...interface{}) {
+	l.mustLog(levelCritical, message, vars...)
+}

migrate.go

@@ -16,14 +16,13 @@ package main
 
 import (
 	"database/sql"
-	"fmt"
 	"os"
 	"os/exec"
 	"path"
+	"runtime"
 	"strconv"
 	"strings"
 	"time"
-	"runtime"
 )
 
 var cmdMigrate = &Command{
@@ -69,18 +68,20 @@ func runMigration(cmd *Command, args []string) int {
 
 	gps := GetGOPATHs()
 	if len(gps) == 0 {
-		ColorLog("[ERRO] Fail to start[ %s ]\n", "GOPATH environment variable is not set or empty")
+		logger.Fatal("GOPATH environment variable is not set or empty")
-		os.Exit(2)
 	}
-	gopath := gps[0]
-	Debugf("GOPATH: %s", gopath)
 
-	// load config
+	gopath := gps[0]
+
+	logger.Debugf("GOPATH: %s", gopath)
+
+	// Load the configuration
 	err := loadConfig()
 	if err != nil {
-		ColorLog("[ERRO] Fail to parse bee.json[ %s ]\n", err)
+		logger.Errorf("Failed to load configuration: %s", err)
 	}
-	// getting command line arguments
+
+	// Getting command line arguments
 	if len(args) != 0 {
 		cmd.Flag.Parse(args[1:])
 	}
@@ -96,31 +97,30 @@ func runMigration(cmd *Command, args []string) int {
 			mConn = "root:@tcp(127.0.0.1:3306)/test"
 		}
 	}
-	ColorLog("[INFO] Using '%s' as 'driver'\n", mDriver)
+	logger.Infof("Using '%s' as 'driver'", mDriver)
-	ColorLog("[INFO] Using '%s' as 'conn'\n", mConn)
+	logger.Infof("Using '%s' as 'conn'", mConn)
 	driverStr, connStr := string(mDriver), string(mConn)
 	if len(args) == 0 {
 		// run all outstanding migrations
-		ColorLog("[INFO] Running all outstanding migrations\n")
+		logger.Info("Running all outstanding migrations")
 		migrateUpdate(currpath, driverStr, connStr)
 	} else {
 		mcmd := args[0]
 		switch mcmd {
 		case "rollback":
-			ColorLog("[INFO] Rolling back the last migration operation\n")
+			logger.Info("Rolling back the last migration operation")
 			migrateRollback(currpath, driverStr, connStr)
 		case "reset":
-			ColorLog("[INFO] Reseting all migrations\n")
+			logger.Info("Reseting all migrations")
 			migrateReset(currpath, driverStr, connStr)
 		case "refresh":
-			ColorLog("[INFO] Refreshing all migrations\n")
+			logger.Info("Refreshing all migrations")
 			migrateRefresh(currpath, driverStr, connStr)
 		default:
-			ColorLog("[ERRO] Command is missing\n")
+			logger.Fatal("Command is missing")
-			os.Exit(2)
 		}
 	}
-	ColorLog("[SUCC] Migration successful!\n")
+	logger.Success("Migration successful!")
 	return 0
 }
 
@@ -153,14 +153,14 @@ func migrate(goal, currpath, driver, connStr string) {
 	}
 	binary := "m" + postfix
 	source := binary + ".go"
-	// connect to database
+
+	// Connect to database
 	db, err := sql.Open(driver, connStr)
 	if err != nil {
-		ColorLog("[ERRO] Could not connect to %s: %s\n", driver, connStr)
+		logger.Fatalf("Could not connect to database using '%s': %s", connStr, err)
-		ColorLog("[ERRO] Error: %v", err.Error())
-		os.Exit(2)
 	}
 	defer db.Close()
+
 	checkForSchemaUpdateTable(db, driver)
 	latestName, latestTime := getLatestMigration(db, goal)
 	writeMigrationSourceFile(dir, source, driver, connStr, latestTime, latestName, goal)
@@ -175,50 +175,44 @@ func migrate(goal, currpath, driver, connStr string) {
 func checkForSchemaUpdateTable(db *sql.DB, driver string) {
 	showTableSQL := showMigrationsTableSQL(driver)
 	if rows, err := db.Query(showTableSQL); err != nil {
-		ColorLog("[ERRO] Could not show migrations table: %s\n", err)
+		logger.Fatalf("Could not show migrations table: %s", err)
-		os.Exit(2)
 	} else if !rows.Next() {
-		// no migrations table, create anew
+		// No migrations table, create new ones
 		createTableSQL := createMigrationsTableSQL(driver)
-		ColorLog("[INFO] Creating 'migrations' table...\n")
+
+		logger.Infof("Creating 'migrations' table...")
+
 		if _, err := db.Query(createTableSQL); err != nil {
-			ColorLog("[ERRO] Could not create migrations table: %s\n", err)
+			logger.Fatalf("Could not create migrations table: %s", err)
-			os.Exit(2)
 		}
 	}
 
-	// checking that migrations table schema are expected
+	// Checking that migrations table schema are expected
 	selectTableSQL := selectMigrationsTableSQL(driver)
 	if rows, err := db.Query(selectTableSQL); err != nil {
-		ColorLog("[ERRO] Could not show columns of migrations table: %s\n", err)
+		logger.Fatalf("Could not show columns of migrations table: %s", err)
-		os.Exit(2)
 	} else {
 		for rows.Next() {
 			var fieldBytes, typeBytes, nullBytes, keyBytes, defaultBytes, extraBytes []byte
 			if err := rows.Scan(&fieldBytes, &typeBytes, &nullBytes, &keyBytes, &defaultBytes, &extraBytes); err != nil {
-				ColorLog("[ERRO] Could not read column information: %s\n", err)
+				logger.Fatalf("Could not read column information: %s", err)
-				os.Exit(2)
 			}
 			fieldStr, typeStr, nullStr, keyStr, defaultStr, extraStr :=
 				string(fieldBytes), string(typeBytes), string(nullBytes), string(keyBytes), string(defaultBytes), string(extraBytes)
 			if fieldStr == "id_migration" {
 				if keyStr != "PRI" || extraStr != "auto_increment" {
-					ColorLog("[ERRO] Column migration.id_migration type mismatch: KEY: %s, EXTRA: %s\n", keyStr, extraStr)
+					logger.Hint("Expecting KEY: PRI, EXTRA: auto_increment")
-					ColorLog("[HINT] Expecting KEY: PRI, EXTRA: auto_increment\n")
+					logger.Fatalf("Column migration.id_migration type mismatch: KEY: %s, EXTRA: %s", keyStr, extraStr)
-					os.Exit(2)
 				}
 			} else if fieldStr == "name" {
 				if !strings.HasPrefix(typeStr, "varchar") || nullStr != "YES" {
-					ColorLog("[ERRO] Column migration.name type mismatch: TYPE: %s, NULL: %s\n", typeStr, nullStr)
+					logger.Hint("Expecting TYPE: varchar, NULL: YES")
-					ColorLog("[HINT] Expecting TYPE: varchar, NULL: YES\n")
+					logger.Fatalf("Column migration.name type mismatch: TYPE: %s, NULL: %s", typeStr, nullStr)
-					os.Exit(2)
 				}
-
 			} else if fieldStr == "created_at" {
 				if typeStr != "timestamp" || defaultStr != "CURRENT_TIMESTAMP" {
-					ColorLog("[ERRO] Column migration.timestamp type mismatch: TYPE: %s, DEFAULT: %s\n", typeStr, defaultStr)
+					logger.Hint("Expecting TYPE: timestamp, DEFAULT: CURRENT_TIMESTAMP")
-					ColorLog("[HINT] Expecting TYPE: timestamp, DEFAULT: CURRENT_TIMESTAMP\n")
+					logger.Fatalf("Column migration.timestamp type mismatch: TYPE: %s, DEFAULT: %s", typeStr, defaultStr)
-					os.Exit(2)
 				}
 			}
 		}
@@ -262,26 +256,22 @@ func selectMigrationsTableSQL(driver string) string {
 func getLatestMigration(db *sql.DB, goal string) (file string, createdAt int64) {
 	sql := "SELECT name FROM migrations where status = 'update' ORDER BY id_migration DESC LIMIT 1"
 	if rows, err := db.Query(sql); err != nil {
-		ColorLog("[ERRO] Could not retrieve migrations: %s\n", err)
+		logger.Fatalf("Could not retrieve migrations: %s", err)
-		os.Exit(2)
 	} else {
 		if rows.Next() {
 			if err := rows.Scan(&file); err != nil {
-				ColorLog("[ERRO] Could not read migrations in database: %s\n", err)
+				logger.Fatalf("Could not read migrations in database: %s", err)
-				os.Exit(2)
 			}
 			createdAtStr := file[len(file)-15:]
 			if t, err := time.Parse("20060102_150405", createdAtStr); err != nil {
-				ColorLog("[ERRO] Could not parse time: %s\n", err)
+				logger.Fatalf("Could not parse time: %s", err)
-				os.Exit(2)
 			} else {
 				createdAt = t.Unix()
 			}
 		} else {
 			// migration table has no 'update' record, no point rolling back
 			if goal == "rollback" {
-				ColorLog("[ERRO] There is nothing to rollback\n")
+				logger.Fatal("There is nothing to rollback")
-				os.Exit(2)
 			}
 			file, createdAt = "", 0
 		}
@@ -293,8 +283,7 @@ func getLatestMigration(db *sql.DB, goal string) (file string, createdAt int64)
 func writeMigrationSourceFile(dir, source, driver, connStr string, latestTime int64, latestName string, task string) {
 	changeDir(dir)
 	if f, err := os.OpenFile(source, os.O_CREATE|os.O_EXCL|os.O_RDWR, 0666); err != nil {
-		ColorLog("[ERRO] Could not create file: %s\n", err)
+		logger.Fatalf("Could not create file: %s", err)
-		os.Exit(2)
 	} else {
 		content := strings.Replace(MigrationMainTPL, "{{DBDriver}}", driver, -1)
 		content = strings.Replace(content, "{{ConnStr}}", connStr, -1)
@@ -302,8 +291,7 @@ func writeMigrationSourceFile(dir, source, driver, connStr string, latestTime in
 		content = strings.Replace(content, "{{LatestName}}", latestName, -1)
 		content = strings.Replace(content, "{{Task}}", task, -1)
 		if _, err := f.WriteString(content); err != nil {
-			ColorLog("[ERRO] Could not write to file: %s\n", err)
+			logger.Fatalf("Could not write to file: %s", err)
-			os.Exit(2)
 		}
 		CloseFile(f)
 	}
@@ -314,7 +302,7 @@ func buildMigrationBinary(dir, binary string) {
 	changeDir(dir)
 	cmd := exec.Command("go", "build", "-o", binary)
 	if out, err := cmd.CombinedOutput(); err != nil {
-		ColorLog("[ERRO] Could not build migration binary: %s\n", err)
+		logger.Errorf("Could not build migration binary: %s", err)
 		formatShellErrOutput(string(out))
 		removeTempFile(dir, binary)
 		removeTempFile(dir, binary+".go")
@@ -328,7 +316,7 @@ func runMigrationBinary(dir, binary string) {
 	cmd := exec.Command("./" + binary)
 	if out, err := cmd.CombinedOutput(); err != nil {
 		formatShellOutput(string(out))
-		ColorLog("[ERRO] Could not run migration binary: %s\n", err)
+		logger.Errorf("Could not run migration binary: %s", err)
 		removeTempFile(dir, binary)
 		removeTempFile(dir, binary+".go")
 		os.Exit(2)
@@ -341,8 +329,7 @@ func runMigrationBinary(dir, binary string) {
 // It exits the system when encouter an error
 func changeDir(dir string) {
 	if err := os.Chdir(dir); err != nil {
-		ColorLog("[ERRO] Could not find migration directory: %s\n", err)
+		logger.Fatalf("Could not find migration directory: %s", err)
-		os.Exit(2)
 	}
 }
 
@@ -350,7 +337,7 @@ func changeDir(dir string) {
 func removeTempFile(dir, file string) {
 	changeDir(dir)
 	if err := os.Remove(file); err != nil {
-		ColorLog("[WARN] Could not remove temporary file: %s\n", err)
+		logger.Warnf("Could not remove temporary file: %s", err)
 	}
 }
 
@@ -358,8 +345,7 @@ func removeTempFile(dir, file string) {
 func formatShellErrOutput(o string) {
 	for _, line := range strings.Split(o, "\n") {
 		if line != "" {
-			ColorLog("[ERRO] -| ")
+			logger.Errorf("|> %s", line)
-			fmt.Println(line)
 		}
 	}
 }
@@ -368,13 +354,13 @@ func formatShellErrOutput(o string) {
 func formatShellOutput(o string) {
 	for _, line := range strings.Split(o, "\n") {
 		if line != "" {
-			ColorLog("[INFO] -| ")
+			logger.Infof("|> %s", line)
-			fmt.Println(line)
 		}
 	}
 }
 
 const (
+	// MigrationMainTPL migration main template
 	MigrationMainTPL = `package main
 
 import(
@@ -414,6 +400,7 @@ func main(){
 }
 
 `
+	// MYSQLMigrationDDL MySQL migration SQL
 	MYSQLMigrationDDL = `
 CREATE TABLE migrations (
 	id_migration int(10) unsigned NOT NULL AUTO_INCREMENT COMMENT 'surrogate key',
@@ -425,7 +412,7 @@ CREATE TABLE migrations (
 	PRIMARY KEY (id_migration)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8
 `
-
+	// POSTGRESMigrationDDL Postgres migration SQL
 	POSTGRESMigrationDDL = `
 CREATE TYPE migrations_status AS ENUM('update', 'rollback');
 

new.go

@@ -58,7 +58,7 @@ func createApp(cmd *Command, args []string) int {
 	ShowShortVersionBanner()
 	w := NewColorWriter(os.Stdout)
 	if len(args) != 1 {
-		ColorLog("[ERRO] Argument [appname] is missing\n")
+		logger.Error("Argument [appname] is missing")
 		os.Exit(2)
 	}
 	apppath, packpath, err := checkEnv(args[0])
@@ -68,14 +68,14 @@ func createApp(cmd *Command, args []string) int {
 	}
 
 	if isExist(apppath) {
-		ColorLog("[ERRO] Path (%s) already exists\n", apppath)
+		logger.Errorf("Path (%s) already exists", apppath)
-		ColorLog("[WARN] Do you want to overwrite it? [Yes|No] ")
+		logger.Warn("Do you want to overwrite it? [Yes|No] ")
 		if !askForConfirmation() {
 			os.Exit(2)
 		}
 	}
 
-	ColorLog("[INFO] Creating application...\n")
+	logger.Info("Creating application...")
 
 	os.MkdirAll(apppath, 0755)
 	fmt.Fprintf(w, "\t%s%screate%s\t %s%s\n", "\x1b[32m", "\x1b[1m", "\x1b[21m", apppath+string(path.Separator), "\x1b[0m")
@@ -117,7 +117,7 @@ func createApp(cmd *Command, args []string) int {
 	fmt.Fprintf(w, "\t%s%screate%s\t %s%s\n", "\x1b[32m", "\x1b[1m", "\x1b[21m", path.Join(apppath, "main.go"), "\x1b[0m")
 	WriteToFile(path.Join(apppath, "main.go"), strings.Replace(maingo, "{{.Appname}}", packpath, -1))
 
-	ColorLog("[SUCC] New application successfully created!\n")
+	logger.Success("New application successfully created!")
 	return 0
 }
 
@@ -302,13 +302,3 @@ var indextpl = `<!DOCTYPE html>
 </body>
 </html>
 `
-
-// WriteToFile creates a file and writes content to it
-func WriteToFile(filename, content string) {
-	f, err := os.Create(filename)
-	defer CloseFile(f)
-	if err != nil {
-		panic(err)
-	}
-	f.WriteString(content)
-}

pack.go

@@ -104,11 +104,6 @@ func init() {
 	w = NewColorWriter(os.Stdout)
 }
 
-func exitPrint(con string) {
-	fmt.Fprintln(os.Stderr, con)
-	os.Exit(2)
-}
-
 type walker interface {
 	isExclude(string) bool
 	isEmpty(string) bool
@@ -397,10 +392,10 @@ func (wft *zipWalk) compress(name, fpath string, fi os.FileInfo) (bool, error) {
 func packDirectory(excludePrefix []string, excludeSuffix []string,
 	excludeRegexp []*regexp.Regexp, includePath ...string) (err error) {
 
-	ColorLog("Excluding relpath prefix: %s\n", strings.Join(excludePrefix, ":"))
+	logger.Infof("Excluding relpath prefix: %s", strings.Join(excludePrefix, ":"))
-	ColorLog("Excluding relpath suffix: %s\n", strings.Join(excludeSuffix, ":"))
+	logger.Infof("Excluding relpath suffix: %s", strings.Join(excludeSuffix, ":"))
 	if len(excludeRegexp) > 0 {
-		ColorLog("Excluding filename regex: `%s`\n", strings.Join(excludeR, "`, `"))
+		logger.Infof("Excluding filename regex: `%s`", strings.Join(excludeR, "`, `"))
 	}
 
 	w, err := os.OpenFile(outputP, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
@@ -477,17 +472,17 @@ func packApp(cmd *Command, args []string) int {
 
 	thePath, err := path.Abs(appPath)
 	if err != nil {
-		exitPrint(fmt.Sprintf("Wrong app path: %s", thePath))
+		logger.Fatalf("Wrong application path: %s", thePath)
 	}
 	if stat, err := os.Stat(thePath); os.IsNotExist(err) || stat.IsDir() == false {
-		exitPrint(fmt.Sprintf("App path does not exist: %s", thePath))
+		logger.Fatalf("Application path does not exist: %s", thePath)
 	}
 
 	if isBeegoProject(thePath) == false {
-		exitPrint(fmt.Sprintf("Bee does not support non Beego project"))
+		logger.Fatal("Bee does not support non Beego project")
 	}
 
-	ColorLog("Packaging application: %s\n", thePath)
+	logger.Infof("Packaging application on '%s'...", thePath)
 
 	appName := path.Base(thePath)
 
@@ -507,7 +502,7 @@ func packApp(cmd *Command, args []string) int {
 	os.Mkdir(tmpdir, 0700)
 
 	if build {
-		ColorLog("Building application...\n")
+		logger.Info("Building application...")
 		var envs []string
 		for _, env := range buildEnvs {
 			parts := strings.SplitN(env, "=", 2)
@@ -529,7 +524,7 @@ func packApp(cmd *Command, args []string) int {
 		os.Setenv("GOOS", goos)
 		os.Setenv("GOARCH", goarch)
 
-		ColorLog("Env: GOOS=%s GOARCH=%s\n", goos, goarch)
+		logger.Infof("Using: GOOS=%s GOARCH=%s", goos, goarch)
 
 		binPath := path.Join(tmpdir, appName)
 		if goos == "windows" {
@@ -552,10 +547,10 @@ func packApp(cmd *Command, args []string) int {
 		execmd.Dir = thePath
 		err = execmd.Run()
 		if err != nil {
-			exitPrint(err.Error())
+			logger.Fatal(err.Error())
 		}
 
-		ColorLog("Build successful\n")
+		logger.Success("Build successful!")
 	}
 
 	switch format {
@@ -573,7 +568,7 @@ func packApp(cmd *Command, args []string) int {
 	if _, err := os.Stat(outputP); err != nil {
 		err = os.MkdirAll(outputP, 0755)
 		if err != nil {
-			exitPrint(err.Error())
+			logger.Fatal(err.Error())
 		}
 	}
 
@@ -595,7 +590,7 @@ func packApp(cmd *Command, args []string) int {
 	for _, r := range excludeR {
 		if len(r) > 0 {
 			if re, err := regexp.Compile(r); err != nil {
-				exitPrint(err.Error())
+				logger.Fatal(err.Error())
 			} else {
 				exr = append(exr, re)
 			}
@@ -604,9 +599,9 @@ func packApp(cmd *Command, args []string) int {
 
 	err = packDirectory(exp, exs, exr, tmpdir, thePath)
 	if err != nil {
-		exitPrint(err.Error())
+		logger.Fatal(err.Error())
 	}
 
-	ColorLog("Writing to output: `%s`\n", outputP)
+	logger.Infof("Writing to output: %s", outputP)
 	return 0
 }

run.go

@@ -15,7 +15,6 @@
 package main
 
 import (
-	"fmt"
 	"io/ioutil"
 	"os"
 	path "path/filepath"
@@ -77,9 +76,8 @@ func runApp(cmd *Command, args []string) int {
 			appname = path.Base(currpath)
 			currentGoPath = _gopath
 		} else {
-			exitPrint(fmt.Sprintf("Bee does not support non Beego project: %s", currpath))
+			logger.Fatalf("No Beego application '%s' found in your GOPATH", currpath)
 		}
-		ColorLog("[INFO] Using '%s' as 'appname'\n", appname)
 	} else {
 		// Check if passed Bee application path/name exists in the GOPATH(s)
 		if found, _gopath, _path := SearchGOPATHs(args[0]); found {
@@ -87,35 +85,35 @@ func runApp(cmd *Command, args []string) int {
 			currentGoPath = _gopath
 			appname = path.Base(currpath)
 		} else {
-			exitPrint(fmt.Sprintf("No Beego application '%s' found in your GOPATH", args[0]))
+			logger.Fatalf("No Beego application '%s' found in your GOPATH", args[0])
 		}
 
-		ColorLog("[INFO] Using '%s' as 'appname'\n", appname)
-
 		if strings.HasSuffix(appname, ".go") && isExist(currpath) {
-			ColorLog("[WARN] The appname is in conflict with currpath's file, do you want to build appname as %s\n", appname)
+			logger.Warnf("The appname is in conflict with file's current path. Do you want to build appname as '%s'", appname)
-			ColorLog("[INFO] Do you want to overwrite it? [yes|no]]  ")
+			logger.Info("Do you want to overwrite it? [yes|no] ")
 			if !askForConfirmation() {
 				return 0
 			}
 		}
 	}
 
-	Debugf("current path:%s\n", currpath)
+	logger.Infof("Using '%s' as 'appname'", appname)
+
+	logger.Debugf("Current path: %s", currpath)
 
 	if runmode == "prod" || runmode == "dev" {
 		os.Setenv("BEEGO_RUNMODE", runmode)
-		ColorLog("[INFO] Using '%s' as 'runmode'\n", os.Getenv("BEEGO_RUNMODE"))
+		logger.Infof("Using '%s' as 'runmode'", os.Getenv("BEEGO_RUNMODE"))
 	} else if runmode != "" {
 		os.Setenv("BEEGO_RUNMODE", runmode)
-		ColorLog("[WARN] Using '%s' as 'runmode'\n", os.Getenv("BEEGO_RUNMODE"))
+		logger.Warnf("Using '%s' as 'runmode'", os.Getenv("BEEGO_RUNMODE"))
 	} else if os.Getenv("BEEGO_RUNMODE") != "" {
-		ColorLog("[WARN] Using '%s' as 'runmode'\n", os.Getenv("BEEGO_RUNMODE"))
+		logger.Warnf("Using '%s' as 'runmode'", os.Getenv("BEEGO_RUNMODE"))
 	}
 
 	err := loadConfig()
 	if err != nil {
-		ColorLog("[ERRO] Failed to load configuration [ %s ]\n", err)
+		logger.Fatalf("Failed to load configuration: %s", err)
 	}
 
 	var paths []string
@@ -143,10 +141,10 @@ func runApp(cmd *Command, args []string) int {
 	}
 	if gendoc == "true" {
 		NewWatcher(paths, files, true)
-		Autobuild(files, true)
+		AutoBuild(files, true)
 	} else {
 		NewWatcher(paths, files, false)
-		Autobuild(files, false)
+		AutoBuild(files, false)
 	}
 
 	for {
@@ -202,16 +200,16 @@ func isExcluded(filePath string) bool {
 	for _, p := range excludedPaths {
 		absP, err := path.Abs(p)
 		if err != nil {
-			ColorLog("[ERROR] Can not get absolute path of [ %s ]\n", p)
+			logger.Errorf("Cannot get absolute path of '%s'", p)
 			continue
 		}
 		absFilePath, err := path.Abs(filePath)
 		if err != nil {
-			ColorLog("[ERROR] Can not get absolute path of [ %s ]\n", filePath)
+			logger.Errorf("Cannot get absolute path of '%s'", filePath)
 			break
 		}
 		if strings.HasPrefix(absFilePath, absP) {
-			ColorLog("[INFO] Excluding from watching [ %s ]\n", filePath)
+			logger.Infof("'%s' is not being watched", filePath)
 			return true
 		}
 	}

rundocs.go

@@ -17,7 +17,6 @@ import (
 	"archive/zip"
 	"fmt"
 	"io"
-	"log"
 	"net/http"
 	"os"
 	"strings"
@@ -63,18 +62,22 @@ func runDocs(cmd *Command, args []string) int {
 		downloadFromURL(swaggerlink, "swagger.zip")
 		err := unzipAndDelete("swagger.zip")
 		if err != nil {
-			fmt.Println("has err exet unzipAndDelete", err)
+			logger.Errorf("Error while unzipping 'swagger.zip' file: %s", err)
 		}
 	}
 	if docport == "" {
 		docport = "8089"
 	}
 	if _, err := os.Stat("swagger"); err != nil && os.IsNotExist(err) {
-		fmt.Println("there's no swagger, please use bee rundocs -isDownload=true downlaod first")
+		logger.Fatal("No Swagger dist found. Run: bee rundocs -isDownload=true")
-		os.Exit(2)
+	}
+
+	logger.Infof("Starting the docs server on: http://127.0.0.1:%s", docport)
+
+	err := http.ListenAndServe(":"+string(docport), http.FileServer(http.Dir("swagger")))
+	if err != nil {
+		logger.Fatalf("%s", err)
 	}
-	fmt.Println("start the docs server on: http://127.0.0.1:" + docport)
-	log.Fatal(http.ListenAndServe(":"+string(docport), http.FileServer(http.Dir("swagger"))))
 	return 0
 }
 
@@ -85,36 +88,36 @@ func downloadFromURL(url, fileName string) {
 	} else if fd.Size() == int64(0) {
 		down = true
 	} else {
-		ColorLog("[%s] Filename %s already exist\n", INFO, fileName)
+		logger.Infof("'%s' already exists", fileName)
 		return
 	}
 	if down {
-		ColorLog("[%s]Downloading %s to %s\n", SUCC, url, fileName)
+		logger.Infof("Downloading '%s' to '%s'...", url, fileName)
 		output, err := os.Create(fileName)
 		if err != nil {
-			ColorLog("[%s]Error while creating %s: %s\n", ERRO, fileName, err)
+			logger.Errorf("Error while creating '%s': %s", fileName, err)
 			return
 		}
 		defer output.Close()
 
 		response, err := http.Get(url)
 		if err != nil {
-			ColorLog("[%s]Error while downloading %s:%s\n", ERRO, url, err)
+			logger.Errorf("Error while downloading '%s': %s", url, err)
 			return
 		}
 		defer response.Body.Close()
 
 		n, err := io.Copy(output, response.Body)
 		if err != nil {
-			ColorLog("[%s]Error while downloading %s:%s\n", ERRO, url, err)
+			logger.Errorf("Error while downloading '%s': %s", url, err)
 			return
 		}
-		ColorLog("[%s] %d bytes downloaded.\n", SUCC, n)
+		logger.Successf("%d bytes downloaded!", n)
 	}
 }
 
 func unzipAndDelete(src string) error {
-	ColorLog("[%s]start to unzip file from %s\n", INFO, src)
+	logger.Infof("Unzipping '%s'...", src)
 	r, err := zip.OpenReader(src)
 	if err != nil {
 		return err
@@ -146,6 +149,6 @@ func unzipAndDelete(src string) error {
 			}
 		}
 	}
-	ColorLog("[%s]Start delete src file %s\n", INFO, src)
+	logger.Successf("Done! Deleting '%s'...", src)
 	return os.RemoveAll(src)
 }

test.go

@@ -51,19 +51,19 @@ var started = make(chan bool)
 
 func testApp(cmd *Command, args []string) int {
 	if len(args) != 1 {
-		ColorLog("[ERRO] Cannot start running[ %s ]\n",
+		logger.Fatalf("Failed to start: %s", "argument 'appname' is missing")
-			"argument 'appname' is missing")
-		os.Exit(2)
 	}
-	crupath, _ := os.Getwd()
+
-	Debugf("current path:%s\n", crupath)
+	currpath, _ := os.Getwd()
+
+	logger.Debugf("Current path: %s", currpath)
 
 	err := loadConfig()
 	if err != nil {
-		ColorLog("[ERRO] Fail to parse bee.json[ %s ]\n", err)
+		logger.Fatalf("Failed to load configuration: %s", err)
 	}
 	var paths []string
-	readAppDirectories(crupath, &paths)
+	readAppDirectories(currpath, &paths)
 
 	NewWatcher(paths, nil, false)
 	appname = args[0]
@@ -76,7 +76,7 @@ func testApp(cmd *Command, args []string) int {
 }
 
 func runTest() {
-	ColorLog("[INFO] Start testing...\n")
+	logger.Info("Start testing...")
 	time.Sleep(time.Second * 1)
 	crupwd, _ := os.Getwd()
 	testDir := path.Join(crupwd, "tests")
@@ -88,14 +88,14 @@ func runTest() {
 	icmd := exec.Command("go", "test")
 	icmd.Stdout = os.Stdout
 	icmd.Stderr = os.Stderr
-	ColorLog("[TRAC] ============== Test Begin ===================\n")
+	logger.Info("============== Test Begin ===================")
 	err = icmd.Run()
-	ColorLog("[TRAC] ============== Test End ===================\n")
+	logger.Info("============== Test End =====================")
 
 	if err != nil {
-		ColorLog("[ERRO] ============== Test failed ===================\n")
+		logger.Error("============== Test failed ===================")
-		ColorLog("[ERRO] %s", err)
+		logger.Errorf("Cause: %s", err)
 		return
 	}
-	ColorLog("[SUCC] Test finish\n")
+	logger.Success("Test Completed")
 }

util.go

@@ -19,6 +19,7 @@ import (
 	"io/ioutil"
 	"log"
 	"os"
+	"os/exec"
 	"path"
 	"path/filepath"
 	"regexp"
@@ -37,124 +38,14 @@ func Go(f func() error) chan error {
 	return ch
 }
 
-// Debugf outputs a formtted debug message, when os.env DEBUG is set.
+// Now returns the current local time in the specified layout
-func Debugf(format string, a ...interface{}) {
+func Now(layout string) string {
-	if os.Getenv("DEBUG") != "" {
+	return time.Now().Format(layout)
-		_, file, line, ok := runtime.Caller(1)
-		if !ok {
-			file = "<unknown>"
-			line = -1
-		} else {
-			file = filepath.Base(file)
-		}
-		fmt.Fprintf(os.Stderr, fmt.Sprintf("[debug] %s:%d %s\n", file, line, format), a...)
-	}
 }
 
-const (
+// EndLine returns the a newline escape character
-	Gray = uint8(iota + 90)
+func EndLine() string {
-	Red
+	return "\n"
-	Green
-	Yellow
-	Blue
-	Magenta
-	//NRed      = uint8(31) // Normal
-	EndColor = "\033[0m"
-
-	INFO = "INFO"
-	TRAC = "TRAC"
-	ERRO = "ERRO"
-	WARN = "WARN"
-	SUCC = "SUCC"
-)
-
-// ColorLog colors log and print to stdout.
-// See color rules in function 'ColorLogS'.
-func ColorLog(format string, a ...interface{}) {
-	fmt.Print(ColorLogS(format, a...))
-}
-
-// ColorLogS colors log and return colored content.
-// Log format: <level> <content [highlight][path]> [ error ].
-// Level: TRAC -> blue; ERRO -> red; WARN -> Magenta; SUCC -> green; others -> default.
-// Content: default; path: yellow; error -> red.
-// Level has to be surrounded by "[" and "]".
-// Highlights have to be surrounded by "# " and " #"(space), "#" will be deleted.
-// Paths have to be surrounded by "( " and " )"(space).
-// Errors have to be surrounded by "[ " and " ]"(space).
-// Note: it hasn't support windows yet, contribute is welcome.
-func ColorLogS(format string, a ...interface{}) string {
-	log := fmt.Sprintf(format, a...)
-
-	var clog string
-
-	if runtime.GOOS != "windows" {
-		// Level.
-		i := strings.Index(log, "]")
-		if log[0] == '[' && i > -1 {
-			clog += "[" + getColorLevel(log[1:i]) + "]"
-		}
-
-		log = log[i+1:]
-
-		// Error.
-		log = strings.Replace(log, "[ ", fmt.Sprintf("[\033[%dm", Red), -1)
-		log = strings.Replace(log, " ]", EndColor+"]", -1)
-
-		// Path.
-		log = strings.Replace(log, "( ", fmt.Sprintf("(\033[%dm", Yellow), -1)
-		log = strings.Replace(log, " )", EndColor+")", -1)
-
-		// Highlights.
-		log = strings.Replace(log, "# ", fmt.Sprintf("\033[%dm", Gray), -1)
-		log = strings.Replace(log, " #", EndColor, -1)
-
-		log = clog + log
-
-	} else {
-		// Level.
-		i := strings.Index(log, "]")
-		if log[0] == '[' && i > -1 {
-			clog += "[" + log[1:i] + "]"
-		}
-
-		log = log[i+1:]
-
-		// Error.
-		log = strings.Replace(log, "[ ", "[", -1)
-		log = strings.Replace(log, " ]", "]", -1)
-
-		// Path.
-		log = strings.Replace(log, "( ", "(", -1)
-		log = strings.Replace(log, " )", ")", -1)
-
-		// Highlights.
-		log = strings.Replace(log, "# ", "", -1)
-		log = strings.Replace(log, " #", "", -1)
-
-		log = clog + log
-	}
-
-	return time.Now().Format("2006/01/02 15:04:05 ") + log
-}
-
-// getColorLevel returns colored level string by given level.
-func getColorLevel(level string) string {
-	level = strings.ToUpper(level)
-	switch level {
-	case INFO:
-		return fmt.Sprintf("\033[%dm%s\033[0m", Blue, level)
-	case TRAC:
-		return fmt.Sprintf("\033[%dm%s\033[0m", Blue, level)
-	case ERRO:
-		return fmt.Sprintf("\033[%dm%s\033[0m", Red, level)
-	case WARN:
-		return fmt.Sprintf("\033[%dm%s\033[0m", Magenta, level)
-	case SUCC:
-		return fmt.Sprintf("\033[%dm%s\033[0m", Green, level)
-	default:
-		return level
-	}
 }
 
 // IsExist returns whether a file or directory exists.
@@ -210,8 +101,7 @@ func isBeegoProject(thePath string) bool {
 func SearchGOPATHs(app string) (bool, string, string) {
 	gps := GetGOPATHs()
 	if len(gps) == 0 {
-		ColorLog("[ERRO] Fail to start [ %s ]\n", "GOPATH environment variable is not set or empty")
+		logger.Fatal("GOPATH environment variable is not set or empty")
-		os.Exit(2)
 	}
 
 	// Lookup the application inside the user workspace(s)
@@ -282,7 +172,7 @@ func snakeString(s string) string {
 		}
 		data = append(data, d)
 	}
-	return strings.ToLower(string(data[:len(data)]))
+	return strings.ToLower(string(data[:]))
 }
 
 func camelString(s string) string {
@@ -306,7 +196,25 @@ func camelString(s string) string {
 		}
 		data = append(data, d)
 	}
-	return string(data[:len(data)])
+	return string(data[:])
+}
+
+// camelCase converts a _ delimited string to camel case
+// e.g. very_important_person => VeryImportantPerson
+func camelCase(in string) string {
+	tokens := strings.Split(in, "_")
+	for i := range tokens {
+		tokens[i] = strings.Title(strings.Trim(tokens[i], " "))
+	}
+	return strings.Join(tokens, "")
+}
+
+// formatSourceCode formats source files
+func formatSourceCode(filename string) {
+	cmd := exec.Command("gofmt", "-w", filename)
+	if err := cmd.Run(); err != nil {
+		logger.Warnf("Error while running gofmt: %s", err)
+	}
 }
 
 // The string flag list, implemented flag.Value interface
@@ -324,7 +232,33 @@ func (s *strFlags) Set(value string) error {
 // CloseFile attempts to close the passed file
 // or panics with the actual error
 func CloseFile(f *os.File) {
-	if err := f.Close(); err != nil {
+	err := f.Close()
+	MustCheck(err)
+}
+
+// MustCheck panics when the error is not nil
+func MustCheck(err error) {
+	if err != nil {
 		panic(err)
 	}
 }
+
+func exitPrint(con string) {
+	fmt.Fprintln(os.Stderr, con)
+	os.Exit(2)
+}
+
+// WriteToFile creates a file and writes content to it
+func WriteToFile(filename, content string) {
+	f, err := os.Create(filename)
+	MustCheck(err)
+	defer CloseFile(f)
+	_, err = f.WriteString(content)
+	MustCheck(err)
+}
+
+// IsDebugEnabled checks if DEBUG_ENABLED is set or not
+func IsDebugEnabled() bool {
+	debugMode := os.Getenv("DEBUG_ENABLED")
+	return map[string]bool{"1": true, "0": false}[debugMode]
+}

version.go

@@ -78,7 +78,7 @@ func getBeegoVersion() string {
 		return ""
 	}
 	if gopath == "" {
-		err = fmt.Errorf("You should set GOPATH env variable")
+		err = fmt.Errorf("You need to set GOPATH environment variable")
 		return ""
 	}
 	wgopath := path.SplitList(gopath)
@@ -90,11 +90,11 @@ func getBeegoVersion() string {
 			if os.IsNotExist(err) {
 				continue
 			}
-			ColorLog("[ERRO] Get `beego.go` has error\n")
+			logger.Error("Error while getting stats of 'beego.go'")
 		}
 		fd, err := os.Open(filename)
 		if err != nil {
-			ColorLog("[ERRO] Open `beego.go` has error\n")
+			logger.Error("Error while reading 'beego.go'")
 			continue
 		}
 		reader := bufio.NewReader(fd)
@@ -114,7 +114,7 @@ func getBeegoVersion() string {
 		}
 
 	}
-	return "Beego not installed. Please install it first: https://github.com/astaxie/beego"
+	return "Beego is not installed. Please do consider installing it first: https://github.com/astaxie/beego"
 }
 
 func getGoVersion() string {
@@ -124,8 +124,7 @@ func getGoVersion() string {
 	)
 
 	if cmdOut, err = exec.Command("go", "version").Output(); err != nil {
-		fmt.Fprintln(os.Stderr, "There was an error running go version command:", err)
+		logger.Fatalf("There was an error running go version command: %s", err)
-		os.Exit(2)
 	}
 	return strings.Split(string(cmdOut), " ")[2]
 }

watch.go

@@ -16,7 +16,6 @@ package main
 
 import (
 	"bytes"
-	"fmt"
 	"github.com/howeyc/fsnotify"
 	"os"
 	"os/exec"
@@ -34,11 +33,11 @@ var (
 	scheduleTime time.Time
 )
 
+// NewWatcher starts an fsnotify Watcher on the specified paths
 func NewWatcher(paths []string, files []string, isgenerate bool) {
 	watcher, err := fsnotify.NewWatcher()
 	if err != nil {
-		ColorLog("[ERRO] Fail to create new Watcher[ %s ]\n", err)
+		logger.Fatalf("Failed to create watcher: %s", err)
-		os.Exit(2)
 	}
 
 	go func() {
@@ -57,14 +56,14 @@ func NewWatcher(paths []string, files []string, isgenerate bool) {
 
 				mt := getFileModTime(e.Name)
 				if t := eventTime[e.Name]; mt == t {
-					ColorLog("[SKIP] # %s #\n", e.String())
+					logger.Infof(bold("Skipping: ")+"%s", e.String())
 					isbuild = false
 				}
 
 				eventTime[e.Name] = mt
 
 				if isbuild {
-					ColorLog("[EVEN] %s\n", e)
+					logger.Infof("Event fired: %s", e)
 					go func() {
 						// Wait 1s before autobuild util there is no file change.
 						scheduleTime = time.Now().Add(1 * time.Second)
@@ -76,22 +75,21 @@ func NewWatcher(paths []string, files []string, isgenerate bool) {
 							return
 						}
 
-						Autobuild(files, isgenerate)
+						AutoBuild(files, isgenerate)
 					}()
 				}
 			case err := <-watcher.Error:
-				ColorLog("[WARN] %s\n", err.Error()) // No need to exit here
+				logger.Warnf("Watcher error: %s", err.Error()) // No need to exit here
 			}
 		}
 	}()
 
-	ColorLog("[INFO] Initializing watcher...\n")
+	logger.Info("Initializing watcher...")
 	for _, path := range paths {
-		ColorLog("[TRAC] Directory( %s )\n", path)
+		logger.Infof(bold("Watching: ")+"%s", path)
 		err = watcher.Watch(path)
 		if err != nil {
-			ColorLog("[ERRO] Fail to watch directory[ %s ]\n", err)
+			logger.Fatalf("Failed to watch directory: %s", err)
-			os.Exit(2)
 		}
 	}
 
@@ -102,25 +100,26 @@ func getFileModTime(path string) int64 {
 	path = strings.Replace(path, "\\", "/", -1)
 	f, err := os.Open(path)
 	if err != nil {
-		ColorLog("[ERRO] Fail to open file[ %s ]\n", err)
+		logger.Errorf("Failed to open file on '%s': %s", path, err)
 		return time.Now().Unix()
 	}
 	defer f.Close()
 
 	fi, err := f.Stat()
 	if err != nil {
-		ColorLog("[ERRO] Fail to get file information[ %s ]\n", err)
+		logger.Errorf("Failed to get file stats: %s", err)
 		return time.Now().Unix()
 	}
 
 	return fi.ModTime().Unix()
 }
 
-func Autobuild(files []string, isgenerate bool) {
+// AutoBuild builds the specified set of files
+func AutoBuild(files []string, isgenerate bool) {
 	state.Lock()
 	defer state.Unlock()
 
-	ColorLog("[INFO] Start building...\n")
+	logger.Info("Start building...")
 
 	os.Chdir(currpath)
 
@@ -162,7 +161,7 @@ func Autobuild(files []string, isgenerate bool) {
 		icmd.Stdout = os.Stdout
 		icmd.Stderr = os.Stderr
 		icmd.Run()
-		ColorLog("============== generate docs ===================\n")
+		logger.Info("============== Generate Docs ===================")
 	}
 
 	if err == nil {
@@ -186,35 +185,38 @@ func Autobuild(files []string, isgenerate bool) {
 	}
 
 	if err != nil {
-		ColorLog("[ERRO] ============== Build failed ===================\n")
+		logger.Error("============== Build Failed ===================")
 		return
 	}
-	ColorLog("[SUCC] Build was successful\n")
+	logger.Success("Built Successfully!")
 	Restart(appname)
 }
 
+// Kill kills the running command process
 func Kill() {
 	defer func() {
 		if e := recover(); e != nil {
-			fmt.Println("Kill.recover -> ", e)
+			logger.Infof("Kill recover: %s", e)
 		}
 	}()
 	if cmd != nil && cmd.Process != nil {
 		err := cmd.Process.Kill()
 		if err != nil {
-			fmt.Println("Kill -> ", err)
+			logger.Errorf("Error while killing cmd process: %s", err)
 		}
 	}
 }
 
+// Restart kills the running command process and starts it again
 func Restart(appname string) {
-	Debugf("kill running process")
+	logger.Debugf("Kill running process")
 	Kill()
 	go Start(appname)
 }
 
+// Start starts the command process
 func Start(appname string) {
-	ColorLog("[INFO] Restarting %s ...\n", appname)
+	logger.Infof("Restarting '%s'...", appname)
 	if strings.Index(appname, "./") == -1 {
 		appname = "./" + appname
 	}
@@ -226,17 +228,17 @@ func Start(appname string) {
 	cmd.Env = append(os.Environ(), conf.Envs...)
 
 	go cmd.Run()
-	ColorLog("[INFO] %s is running...\n", appname)
+	logger.Successf("'%s' is running...", appname)
 	started <- true
 }
 
-// Should ignore filenames generated by
+// shouldIgnoreFile ignores filenames generated by Emacs, Vim or SublimeText.
-// Emacs, Vim or SublimeText
+// It returns true if the file should be ignored, false otherwise.
 func shouldIgnoreFile(filename string) bool {
 	for _, regex := range ignoredFilesRegExps {
 		r, err := regexp.Compile(regex)
 		if err != nil {
-			panic("Could not compile the regex: " + regex)
+			logger.Fatalf("Could not compile regular expression: %s", err)
 		}
 		if r.MatchString(filename) {
 			return true