refactoring: arrange error handing and application initializing

realize.go

@@ -27,19 +27,25 @@ const (
 	interval = 200
 )
 
-var r realize
-
-// Realize struct contains the general app informations
-type realize struct {
+// Cli commands
+func main() {
+	// Realize struct contains the general app informations
+	type realize struct {
 		settings.Settings `yaml:"settings,omitempty"`
 		Sync              chan string        `yaml:"-"`
 		Blueprint         watcher.Blueprint  `yaml:"-"`
 		Server            server.Server      `yaml:"-"`
 		Projects          *[]watcher.Project `yaml:"projects" json:"projects"`
-}
+	}
+
+	var r realize
+	// Before of every exec of a cli method
+	before := func(*cli.Context) error {
+		gopath := os.Getenv("GOPATH")
+		if gopath == "" {
+			return errors.New("$GOPATH isn't set up properly")
+		}
 
-// Realize struct initialization
-func init() {
 		r = realize{
 			Sync: make(chan string),
 			Settings: settings.Settings{
@@ -72,34 +78,19 @@ func init() {
 		r.Projects = &r.Blueprint.Projects
 
 		// read if exist
-	r.Read(&r)
+		if err := r.Read(&r); err != nil {
+			return err
+		}
 
 		// increase the file limit
 		if r.Config.Flimit != 0 {
-		r.Flimit()
+			if err := r.Flimit(); err != nil {
+				return err
 			}
-}
-
-// Before of every exec of a cli method
-func before() error {
-	gopath := os.Getenv("GOPATH")
-	if gopath == "" {
-		return handle(errors.New("$GOPATH isn't set up properly"))
 		}
 		return nil
-}
-
-// Handle errors
-func handle(err error) error {
-	if err != nil {
-		fmt.Println(style.Red.Bold(err.Error()))
-		os.Exit(1)
 	}
-	return nil
-}
 
-// Cli commands
-func main() {
 	app := &cli.App{
 		Name:    "Realize",
 		Version: appVersion,
@@ -142,16 +133,22 @@ func main() {
 							r.Config.Create = false
 						}
 						r.Blueprint.Projects = []watcher.Project{}
-						handle(r.Blueprint.Add(p))
+						if err := r.Blueprint.Add(p); err != nil {
+							return err
+						}
+					}
+					if err := r.Server.Start(p); err != nil {
+						return err
+					}
+					if err := r.Blueprint.Run(); err != nil {
+						return err
+					}
+					if err := r.Record(r); err != nil {
+						return err
 					}
-					handle(r.Server.Start(p))
-					handle(r.Blueprint.Run())
-					handle(r.Record(r))
 					return nil
 				},
-				Before: func(c *cli.Context) error {
-					return before()
-				},
+				Before: before,
 			},
 			{
 				Name:        "add",
@@ -170,16 +167,18 @@ func main() {
 					&cli.BoolFlag{Name: "no-install", Aliases: []string{"ni"}, Value: false, Usage: "Disable go install"},
 					&cli.BoolFlag{Name: "no-config", Aliases: []string{"nc"}, Value: false, Usage: "Ignore existing configurations."},
 				},
-				Action: func(p *cli.Context) (err error) {
+				Action: func(p *cli.Context) error {
 					fmt.Println(p.String("path"))
-					handle(r.Blueprint.Add(p))
-					handle(r.Record(r))
+					if err := r.Blueprint.Add(p); err != nil {
+						return err
+					}
+					if err := r.Record(r); err != nil {
+						return err
+					}
 					fmt.Println(style.Yellow.Bold("[")+"REALIZE"+style.Yellow.Bold("]"), style.Green.Bold("Your project was successfully added."))
 					return nil
 				},
-				Before: func(c *cli.Context) error {
-					return before()
-				},
+				Before: before,
 			},
 			{
 				Name:        "init",
@@ -866,13 +865,13 @@ func main() {
 							return nil
 						},
 					})
-					handle(r.Record(r))
+					if err := r.Record(r); err != nil {
+						return err
+					}
 					fmt.Println(style.Yellow.Bold("[")+"REALIZE"+style.Yellow.Bold("]"), style.Green.Bold("Your configuration was successful."))
 					return nil
 				},
-				Before: func(c *cli.Context) error {
-					return before()
-				},
+				Before: before,
 			},
 			{
 				Name:        "remove",
@@ -883,14 +882,16 @@ func main() {
 					&cli.StringFlag{Name: "name", Aliases: []string{"n"}, Value: ""},
 				},
 				Action: func(p *cli.Context) error {
-					handle(r.Blueprint.Remove(p))
-					handle(r.Record(r))
+					if err := r.Blueprint.Remove(p); err != nil {
+						return err
+					}
+					if err := r.Record(r); err != nil {
+						return err
+					}
 					fmt.Println(style.Yellow.Bold("[")+"REALIZE"+style.Yellow.Bold("]"), style.Green.Bold("Your project was successfully removed."))
 					return nil
 				},
-				Before: func(c *cli.Context) error {
-					return before()
-				},
+				Before: before,
 			},
 			{
 				Name:        "list",
@@ -898,11 +899,9 @@ func main() {
 				Aliases:     []string{"l"},
 				Description: "Print projects list.",
 				Action: func(p *cli.Context) error {
-					return handle(r.Blueprint.List())
-				},
-				Before: func(c *cli.Context) error {
-					return before()
+					return r.Blueprint.List()
 				},
+				Before: before,
 			},
 			{
 				Name:        "clean",
@@ -910,15 +909,19 @@ func main() {
 				Aliases:     []string{"c"},
 				Description: "Remove realize folder.",
 				Action: func(p *cli.Context) error {
-					handle(r.Settings.Remove())
+					if err := r.Settings.Remove(); err != nil {
+						return err
+					}
 					fmt.Println(style.Yellow.Bold("[")+"REALIZE"+style.Yellow.Bold("]"), style.Green.Bold("Realize folder successfully removed."))
 					return nil
 				},
-				Before: func(c *cli.Context) error {
-					return before()
-				},
+				Before: before,
 			},
 		},
 	}
-	app.Run(os.Args)
+
+	if err := app.Run(os.Args); err != nil {
+		fmt.Println(style.Red.Bold(err))
+		os.Exit(1)
+	}
 }

settings/flimit.go

@@ -5,12 +5,13 @@ package settings
 import "syscall"
 
 // Flimit defines the max number of watched files
-func (s *Settings) Flimit() {
+func (s *Settings) Flimit() error {
 	var rLimit syscall.Rlimit
 	rLimit.Max = uint64(s.Config.Flimit)
 	rLimit.Cur = uint64(s.Config.Flimit)
-	err := syscall.Setrlimit(syscall.RLIMIT_NOFILE, &rLimit)
-	if err != nil {
-		s.Fatal(err, "Error setting rlimit")
+
+	if err := syscall.Setrlimit(syscall.RLIMIT_NOFILE, &rLimit); err != nil {
+		return err
 	}
+	return nil
 }

settings/flimit_windows.go

@@ -1,6 +1,7 @@
+// build windows
 package settings
 
 // Flimit defines the max number of watched files
-func (s *Settings) Flimit() {
-	return
+func (s *Settings) Flimit() error {
+	return nil
 }