Add purge feature

build.go

@@ -19,6 +19,7 @@ func buildAction(ctx *cli.Context) error {
 	opts := readCfg(cfgPath)
 
 	for _, o := range opts {
+		purge(o)
 		cp(o)
 
 		if ctx.Bool("p") {
@@ -28,7 +29,7 @@ func buildAction(ctx *cli.Context) error {
 			o.ESBuild.Sourcemap = api.SourceMapNone
 		}
 
-		api.Build(o.ESBuild)
+		api.Build(o.ESBuild.BuildOptions)
 		replace(o)
 	}
 

main.go

@@ -17,8 +17,13 @@ import (
 
 var triggerReload = make(chan struct{})
 
+type ESBuildExtended struct {
+	api.BuildOptions
+	PurgeBeforeBuild bool
+}
+
 type options struct {
-	ESBuild api.BuildOptions
+	ESBuild ESBuildExtended
 	Watch   struct {
 		Path    string
 		Exclude []string
@@ -75,6 +80,28 @@ func main() {
 	}
 
 	app := &cli.App{
+		Name:    "gowebbuild",
+		Usage:   "All in one tool to build web frontend projects.",
+		Version: "4.1.0",
+		Authors: []*cli.Author{{
+			Name: "trading-peter (https://github.com/trading-peter)",
+		}},
+		UsageText: `gowebbuild [global options] command [command options] [arguments...]
+
+Examples:
+
+Watch project and rebuild if a files changes:
+$ gowebbuild
+
+Use a different name or path for the config file (working directory is always the location of the config file):
+$ gowebbuild -c watch
+
+Production build:
+$ gowebbuild build -p
+
+Manually replace a string within some files (not limited to project directory):
+$ gowebbuild replace *.go foo bar
+`,
 		Commands: []*cli.Command{
 			{
 				Name:  "build",
@@ -106,7 +133,7 @@ func main() {
 
 			{
 				Name:      "replace",
-				ArgsUsage: "[files] [search] [replace]",
+				ArgsUsage: "[glob file pattern] [search] [replace]",
 				Usage:     "replace text in files",
 				Action: func(ctx *cli.Context) error {
 					files := ctx.Args().Get(0)
@@ -146,6 +173,18 @@ func main() {
 	}
 }
 
+func purge(opts options) {
+	if opts.ESBuild.PurgeBeforeBuild {
+		if opts.ESBuild.Outdir != "" {
+			os.RemoveAll(opts.ESBuild.Outdir)
+		}
+
+		if opts.ESBuild.Outfile != "" {
+			os.Remove(opts.ESBuild.Outfile)
+		}
+	}
+}
+
 func cp(opts options) {
 	if len(opts.Copy) == 0 {
 		fmt.Println("Nothing to copy")
@@ -242,7 +281,7 @@ func isDir(path string) bool {
 }
 
 func build(opts options) {
-	result := api.Build(opts.ESBuild)
+	result := api.Build(opts.ESBuild.BuildOptions)
 
 	if len(result.Errors) == 0 {
 		triggerReload <- struct{}{}

watch.go

@@ -49,6 +49,7 @@ func watchAction(ctx *cli.Context) error {
 					select {
 					case event := <-w.Event:
 						fmt.Printf("File %s changed\n", event.Name())
+						purge(opts)
 						cp(opts)
 						build(opts)
 						replace(opts)