New command structure. Add replace command.

Allow array of build configs.

.gitignore

@@ -0,0 +1,2 @@
+
+vendor/

build.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+
+	"github.com/evanw/esbuild/pkg/api"
+	"github.com/urfave/cli/v2"
+)
+
+func buildAction(ctx *cli.Context) error {
+	cfgPath := ctx.String("c")
+	os.Chdir(filepath.Dir(cfgPath))
+	opts := readCfg(cfgPath)
+
+	for _, o := range opts {
+		cp(o)
+
+		if ctx.Bool("p") {
+			o.ESBuild.MinifyIdentifiers = true
+			o.ESBuild.MinifySyntax = true
+			o.ESBuild.MinifyWhitespace = true
+			o.ESBuild.Sourcemap = api.SourceMapNone
+		}
+
+		api.Build(o.ESBuild)
+		replace(o)
+	}
+
+	return nil
+}

go.mod

@@ -1,17 +1,25 @@
-module gitlab.codeblob.work/pk/gowebbuild
+module github.com/trading-peter/gowebbuild
 
-go 1.17
+go 1.18
 
 require (
-	github.com/evanw/esbuild v0.14.5
+	github.com/evanw/esbuild v0.14.50
-	github.com/goyek/goyek v0.6.0
+	github.com/goyek/goyek v0.6.3
 	github.com/jaschaephraim/lrserver v0.0.0-20171129202958-50d19f603f71
+	github.com/otiai10/copy v1.7.0
 	github.com/radovskyb/watcher v1.0.7
+	github.com/tidwall/gjson v1.14.1
 )
 
 require (
-	github.com/gorilla/websocket v1.4.2 // indirect
+	github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect
+	github.com/gorilla/websocket v1.5.0 // indirect
+	github.com/russross/blackfriday/v2 v2.1.0 // indirect
 	github.com/smartystreets/goconvey v1.7.2 // indirect
-	golang.org/x/sys v0.0.0-20210908233432-aa78b53d3365 // indirect
+	github.com/tidwall/match v1.1.1 // indirect
+	github.com/tidwall/pretty v1.2.0 // indirect
+	github.com/urfave/cli/v2 v2.16.3 // indirect
+	github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 // indirect
+	golang.org/x/sys v0.0.0-20220728004956-3c1f35247d10 // indirect
 	gopkg.in/fsnotify.v1 v1.4.7 // indirect
 )

go.sum

@@ -1,26 +1,48 @@
-github.com/evanw/esbuild v0.14.5 h1:Gh/vGvDL/g++7erzQZofohZqFBzQblWfLdtYCf15zcQ=
+github.com/cpuguy83/go-md2man/v2 v2.0.2 h1:p1EgwI/C7NhT0JmVkwCD2ZBK8j4aeHQX2pMHHBfMQ6w=
-github.com/evanw/esbuild v0.14.5/go.mod h1:GG+zjdi59yh3ehDn4ZWfPcATxjPDUH53iU4ZJbp7dkY=
+github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/evanw/esbuild v0.14.50 h1:h7sijkRPGB9ckpIOc6FMZ81/NMy/4g40LhsBAtPa3/I=
+github.com/evanw/esbuild v0.14.50/go.mod h1:dkwI35DCMf0iR+tJDiCEiPKZ4A+AotmmeLpPEv3dl9k=
 github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1 h1:EGx4pi6eqNxGaHF6qqu48+N2wcFQ5qg5FXgOdqsJ5d8=
 github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
-github.com/gorilla/websocket v1.4.2 h1:+/TMaTYc4QFitKJxsQ7Yye35DkWvkdLcvGKqM+x0Ufc=
+github.com/gorilla/websocket v1.5.0 h1:PPwGk2jz7EePpoHN/+ClbZu8SPxiqlu12wZP/3sWmnc=
-github.com/gorilla/websocket v1.4.2/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
+github.com/gorilla/websocket v1.5.0/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
-github.com/goyek/goyek v0.6.0 h1:2YQ4V3X7q+zFF98IBWMc1WRwfzs0TQ8jrwOKY3XRQRk=
+github.com/goyek/goyek v0.6.3 h1:t0h3gWdlvGeSChltiyAyka9Mlcp3CEPDRssRf0XHDTM=
-github.com/goyek/goyek v0.6.0/go.mod h1:UGjZz3juJL2l2eMqRbxQYjG8ieyKb7WMYPv0KB0KVxA=
+github.com/goyek/goyek v0.6.3/go.mod h1:UGjZz3juJL2l2eMqRbxQYjG8ieyKb7WMYPv0KB0KVxA=
 github.com/jaschaephraim/lrserver v0.0.0-20171129202958-50d19f603f71 h1:24NdJ5N6gtrcoeS4JwLMeruKFmg20QdF/5UnX5S/j18=
 github.com/jaschaephraim/lrserver v0.0.0-20171129202958-50d19f603f71/go.mod h1:ozZLfjiLmXytkIUh200wMeuoQJ4ww06wN+KZtFP6j3g=
 github.com/jtolds/gls v4.20.0+incompatible h1:xdiiI2gbIgH/gLH7ADydsJ1uDOEzR8yvV7C0MuV77Wo=
 github.com/jtolds/gls v4.20.0+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU=
+github.com/otiai10/copy v1.7.0 h1:hVoPiN+t+7d2nzzwMiDHPSOogsWAStewq3TwU05+clE=
+github.com/otiai10/copy v1.7.0/go.mod h1:rmRl6QPdJj6EiUqXQ/4Nn2lLXoNQjFCQbbNrxgc/t3U=
+github.com/otiai10/curr v0.0.0-20150429015615-9b4961190c95/go.mod h1:9qAhocn7zKJG+0mI8eUu6xqkFDYS2kb2saOteoSB3cE=
+github.com/otiai10/curr v1.0.0/go.mod h1:LskTG5wDwr8Rs+nNQ+1LlxRjAtTZZjtJW4rMXl6j4vs=
+github.com/otiai10/mint v1.3.0/go.mod h1:F5AjcsTsWUqX+Na9fpHb52P8pcRX2CI6A3ctIT91xUo=
+github.com/otiai10/mint v1.3.3 h1:7JgpsBaN0uMkyju4tbYHu0mnM55hNKVYLsXmwr15NQI=
+github.com/otiai10/mint v1.3.3/go.mod h1:/yxELlJQ0ufhjUwhshSj+wFjZ78CnZ48/1wtmBH1OTc=
 github.com/radovskyb/watcher v1.0.7 h1:AYePLih6dpmS32vlHfhCeli8127LzkIgwJGcwwe8tUE=
 github.com/radovskyb/watcher v1.0.7/go.mod h1:78okwvY5wPdzcb1UYnip1pvrZNIVEIh/Cm+ZuvsUYIg=
+github.com/russross/blackfriday/v2 v2.1.0 h1:JIOH55/0cWyOuilr9/qlrm0BSXldqnqwMsf35Ld67mk=
+github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/smartystreets/assertions v1.2.0 h1:42S6lae5dvLc7BrLu/0ugRtcFVjoJNMC/N3yZFZkDFs=
 github.com/smartystreets/assertions v1.2.0/go.mod h1:tcbTF8ujkAEcZ8TElKY+i30BzYlVhC/LOxJk7iOWnoo=
 github.com/smartystreets/goconvey v1.7.2 h1:9RBaZCeXEQ3UselpuwUQHltGVXvdwm6cv1hgR6gDIPg=
 github.com/smartystreets/goconvey v1.7.2/go.mod h1:Vw0tHAZW6lzCRk3xgdin6fKYcG+G3Pg9vgXWeJpQFMM=
+github.com/tidwall/gjson v1.14.1 h1:iymTbGkQBhveq21bEvAQ81I0LEBork8BFe1CUZXdyuo=
+github.com/tidwall/gjson v1.14.1/go.mod h1:/wbyibRr2FHMks5tjHJ5F8dMZh3AcwJEMf5vlfC0lxk=
+github.com/tidwall/match v1.1.1 h1:+Ho715JplO36QYgwN9PGYNhgZvoUSc9X2c80KVTi+GA=
+github.com/tidwall/match v1.1.1/go.mod h1:eRSPERbgtNPcGhD8UCthc6PmLEQXEWd3PRB5JTxsfmM=
+github.com/tidwall/pretty v1.2.0 h1:RWIZEg2iJ8/g6fDDYzMpobmaoGh5OLl4AXtGUGPcqCs=
+github.com/tidwall/pretty v1.2.0/go.mod h1:ITEVvHYasfjBbM0u2Pg8T2nJnzm8xPwvNhhsoaGGjNU=
+github.com/urfave/cli/v2 v2.16.3 h1:gHoFIwpPjoyIMbJp/VFd+/vuD0dAgFK4B6DpEMFJfQk=
+github.com/urfave/cli/v2 v2.16.3/go.mod h1:1CNUng3PtjQMtRzJO4FMXBQvkGtuYRxxiR9xMa7jMwI=
+github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 h1:bAn7/zixMGCfxrRTfdpNzjtPYqr8smhKouy9mxVdGPU=
+github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673/go.mod h1:N3UwUGtsrSj3ccvlPHLoLsHnpR27oXr4ZE984MbSER8=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20210908233432-aa78b53d3365 h1:6wSTsvPddg9gc/mVEEyk9oOAoxn+bT4Z9q1zx+4RwA4=
+golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20210908233432-aa78b53d3365/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220728004956-3c1f35247d10 h1:WIoqL4EROvwiPdUtaip4VcDdpZ4kha7wBWZrbVKCIZg=
+golang.org/x/sys v0.0.0-20220728004956-3c1f35247d10/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/tools v0.0.0-20190328211700-ab21143f2384/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=

linker.go

@@ -0,0 +1,128 @@
+package main
+
+import (
+	"fmt"
+	"io/fs"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+
+	"github.com/otiai10/copy"
+	"github.com/radovskyb/watcher"
+	"github.com/tidwall/gjson"
+)
+
+func link(from, to string) chan struct{} {
+	requestBuildCh := make(chan struct{})
+
+	// Load package.json in destination.
+	destPkg := readFileContent(filepath.Join(to, "package.json"))
+	depsRaw := gjson.Get(destPkg, "dependencies").Map()
+	deps := map[string]bool{}
+	for k := range depsRaw {
+		deps[k] = true
+	}
+
+	packages := map[string]string{}
+	packageFiles := findFiles(from, "package.json")
+
+	for i := range packageFiles {
+		content := readFileContent(packageFiles[i])
+		name := gjson.Get(content, "name").String()
+
+		if deps[name] {
+			pp, err := filepath.Abs(filepath.Dir(packageFiles[i]))
+			if err == nil {
+				packages[name] = pp
+			}
+		}
+	}
+
+	fmt.Printf("Found %d npm packages to monitor for changes.\n", len(packages))
+
+	go func() {
+		w := watcher.New()
+		w.SetMaxEvents(1)
+		w.FilterOps(watcher.Write, watcher.Rename, watcher.Move, watcher.Create, watcher.Remove)
+
+		if err := w.AddRecursive(from); err != nil {
+			fmt.Println(err.Error())
+			os.Exit(1)
+		}
+
+		go func() {
+			for {
+				select {
+				case event := <-w.Event:
+					fmt.Printf("File %s changed\n", event.Path)
+					for k, v := range packages {
+						if strings.HasPrefix(event.Path, v) {
+							src := filepath.Dir(event.Path)
+							dest := filepath.Join(to, "node_modules", k)
+							fmt.Printf("Copying %s to %s\n", src, dest)
+							err := copy.Copy(src, dest, copy.Options{
+								Skip: func(src string) (bool, error) {
+									ok, _ := filepath.Match("*.js", filepath.Base(src))
+									if ok && !strings.Contains(src, "node_modules") {
+										return false, nil
+									}
+
+									return true, nil
+								},
+								Sync: true,
+							})
+
+							if err != nil {
+								fmt.Printf("Failed to copy %s: %v\n", k, err)
+							}
+
+							requestBuildCh <- struct{}{}
+						}
+					}
+				case err := <-w.Error:
+					fmt.Println(err.Error())
+				case <-w.Closed:
+					return
+				}
+			}
+		}()
+
+		fmt.Printf("Watching packages in %s\n", from)
+
+		if err := w.Start(time.Millisecond * 100); err != nil {
+			fmt.Println(err.Error())
+		}
+	}()
+
+	return requestBuildCh
+}
+
+func findFiles(root, name string) []string {
+	paths := []string{}
+
+	filepath.WalkDir(root, func(path string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return nil
+		}
+
+		if !d.IsDir() && filepath.Base(path) == name && !strings.Contains(path, "node_modules") {
+			paths = append(paths, path)
+		}
+
+		return nil
+	})
+
+	return paths
+}
+
+func readFileContent(path string) string {
+	pkgData, err := os.ReadFile(path)
+
+	if err != nil {
+		fmt.Printf("%+v\n", err)
+		os.Exit(1)
+	}
+
+	return string(pkgData)
+}

main.go

@@ -2,16 +2,16 @@ package main
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
+	"io/ioutil"
 	"os"
-	"os/signal"
+	"path/filepath"
-	"syscall"
+	"strings"
-	"time"
 
 	"github.com/evanw/esbuild/pkg/api"
-	"github.com/goyek/goyek"
+	"github.com/otiai10/copy"
-	"github.com/jaschaephraim/lrserver"
+	"github.com/urfave/cli/v2"
-	"github.com/radovskyb/watcher"
 )
 
 var triggerReload = make(chan struct{})
@@ -20,97 +20,224 @@ type options struct {
 	ESBuild api.BuildOptions
 	Watch   struct {
 		Path    string
+		Exclude []string
+	}
+	Serve struct {
+		Path string
+		Port int
+	}
+	Copy []struct {
+		Src  string
+		Dest string
+	}
+	Replace []struct {
+		Pattern string
+		Search  string
+		Replace string
+	}
+	Link struct {
+		From string
+		To   string
 	}
 }
 
+func readCfg(cfgPath string) []options {
+	cfgContent, err := os.ReadFile(cfgPath)
+
+	if err != nil {
+		fmt.Printf("%+v\n", err)
+		os.Exit(1)
+	}
+
+	optsSetups := []options{}
+
+	err = json.Unmarshal(cfgContent, &optsSetups)
+	if err != nil {
+		opt := options{}
+		err = json.Unmarshal(cfgContent, &opt)
+		if err != nil {
+			fmt.Printf("%+v\n", err)
+			os.Exit(1)
+		}
+
+		optsSetups = append(optsSetups, opt)
+	}
+
+	return optsSetups
+}
+
 func main() {
-	opts := options{}
+	cfgParam := &cli.StringFlag{
-	cfgContent, err := os.ReadFile("./.gowebbuild.json")
+		Name:  "c",
-
+		Value: "./.gowebbuild.json",
-	if err != nil {
+		Usage: "path to config file config file.",
-		fmt.Printf("%+v\n", err)
-		os.Exit(1)
 	}
 
-	err = json.Unmarshal(cfgContent, &opts)
+	app := &cli.App{
-	if err != nil {
+		Commands: []*cli.Command{
-		fmt.Printf("%+v\n", err)
+			{
-		os.Exit(1)
+				Name:  "build",
+				Usage: "build web sources one time and exit",
+				Flags: []cli.Flag{
+					cfgParam,
+					&cli.BoolFlag{
+						Name:  "p",
+						Value: false,
+						Usage: "use production ready build settings",
+					},
+				},
+				Action: buildAction,
+			},
+
+			{
+				Name:  "watch",
+				Usage: "watch for changes and trigger the build",
+				Flags: []cli.Flag{
+					cfgParam,
+				},
+				Action: watchAction,
+			},
+
+			{
+				Name:      "replace",
+				ArgsUsage: "[files] [search] [replace]",
+				Usage:     "replace text in files",
+				Action: func(ctx *cli.Context) error {
+					files := ctx.Args().Get(0)
+					searchStr := ctx.Args().Get(1)
+					replaceStr := ctx.Args().Get(2)
+
+					if files == "" {
+						return fmt.Errorf("invalid file pattern")
 					}
 
-	flow := &goyek.Flow{}
+					if searchStr == "" {
-
+						return fmt.Errorf("invalid search string")
-	flow.Register(goyek.Task{
-		Name:  "watch-frontend",
-		Usage: "",
-		Action: func(tf *goyek.TF) {
-			c := make(chan os.Signal, 1)
-			signal.Notify(c, os.Interrupt, syscall.SIGTERM)
-
-			fmt.Println("Starting live reload server")
-
-			go func() {
-				w := watcher.New()
-				w.SetMaxEvents(1)
-				w.FilterOps(watcher.Write, watcher.Rename, watcher.Move, watcher.Create, watcher.Remove)
-				if err := w.AddRecursive(opts.Watch.Path); err != nil {
-					fmt.Println(err.Error())
-					os.Exit(1)
 					}
 
-				go func() {
+					replace(options{
-					for {
+						Replace: []struct {
-						select {
+							Pattern string
-						case event := <-w.Event:
+							Search  string
-							fmt.Printf("File %s changed\n", event.Name())
+							Replace string
-							build(opts)
+						}{
-						case err := <-w.Error:
+							{
-							fmt.Println(err.Error())
+								Pattern: files,
-						case <-w.Closed:
+								Search:  searchStr,
-							return
+								Replace: replaceStr,
-						}
+							},
-					}
-				}()
-
-				fmt.Printf("Watching %d elements in %s\n", len(w.WatchedFiles()), opts.Watch.Path)
-
-				if err := w.Start(time.Millisecond * 100); err != nil {
-					fmt.Println(err.Error())
-				}
-			}()
-
-			go func() {
-				lr := lrserver.New(lrserver.DefaultName, lrserver.DefaultPort)
-
-				go func() {
-					for {
-						<-triggerReload
-						lr.Reload("")
-					}
-				}()
-
-				lr.SetStatusLog(nil)
-				err := lr.ListenAndServe()
-				if err != nil {
-					panic(err)
-				}
-			}()
-
-			<-c
-			fmt.Println("\nExit")
-			os.Exit(0)
 						},
 					})
+					return nil
+				},
+			},
+		},
+	}
 
-	flow.Main()
+	if err := app.Run(os.Args); err != nil {
+		fmt.Println(err)
+	}
+}
+
+func cp(opts options) {
+	if len(opts.Copy) == 0 {
+		fmt.Println("Nothing to copy")
+		return
+	}
+	for _, op := range opts.Copy {
+		paths, err := filepath.Glob(op.Src)
+		if err != nil {
+			fmt.Printf("Invalid glob pattern: %s\n", op.Src)
+			continue
+		}
+
+		destIsDir := isDir(op.Dest)
+		for _, p := range paths {
+			d := op.Dest
+
+			if destIsDir && isFile(p) {
+				d = filepath.Join(d, filepath.Base(p))
+			}
+			err := copy.Copy(p, d)
+			fmt.Printf("Copying %s to %s\n", p, d)
+
+			if err != nil {
+				fmt.Printf("Failed to copy %s: %v\n", p, err)
+				continue
+			}
+		}
+	}
+}
+
+func replace(opts options) {
+	if len(opts.Replace) == 0 {
+		fmt.Println("Nothing to replace")
+		return
+	}
+	for _, op := range opts.Replace {
+		paths, err := filepath.Glob(op.Pattern)
+		if err != nil {
+			fmt.Printf("Invalid glob pattern: %s\n", op.Pattern)
+			continue
+		}
+
+		for _, p := range paths {
+			if !isFile(p) {
+				continue
+			}
+
+			read, err := ioutil.ReadFile(p)
+			if err != nil {
+				fmt.Printf("%+v\n", err)
+				os.Exit(1)
+			}
+
+			r := op.Replace
+			if strings.HasPrefix(op.Replace, "$") {
+				r = os.ExpandEnv(op.Replace)
+			}
+
+			count := strings.Count(string(read), op.Search)
+
+			if count > 0 {
+				fmt.Printf("Replacing %d occurrences of '%s' with '%s' in %s\n", count, op.Search, r, p)
+				newContents := strings.ReplaceAll(string(read), op.Search, r)
+				err = ioutil.WriteFile(p, []byte(newContents), 0)
+
+				if err != nil {
+					fmt.Printf("%+v\n", err)
+					os.Exit(1)
+				}
+			}
+		}
+	}
+}
+
+func isFile(path string) bool {
+	stat, err := os.Stat(path)
+
+	if errors.Is(err, os.ErrNotExist) {
+		return false
+	}
+
+	return !stat.IsDir()
+}
+
+func isDir(path string) bool {
+	stat, err := os.Stat(path)
+
+	if errors.Is(err, os.ErrNotExist) {
+		os.MkdirAll(path, 0755)
+		return true
+	}
+
+	return err == nil && stat.IsDir()
 }
 
 func build(opts options) {
 	result := api.Build(opts.ESBuild)
 
-	if len(result.Errors) > 0 {
+	if len(result.Errors) == 0 {
-		os.Exit(1)
-	} else {
 		triggerReload <- struct{}{}
 	}
 }

sample.gowebbuild.json

@@ -0,0 +1,49 @@
+{
+  "Watch": {
+    "Path": "./frontend/src",
+    "Exclude": [ "./dist" ]
+  },
+  "Copy": [
+    {
+      "Src": "./frontend/index.html",
+      "Dest": "./api/frontend-dist"
+    },
+    {
+      "Src": "./frontend/src/audio",
+      "Dest": "./api/frontend-dist/audio"
+    },
+    {
+      "Src": "./frontend/src/icon-*.png",
+      "Dest": "./api/frontend-dist"
+    },
+    {
+      "Src": "./frontend/src/manifest.webmanifest",
+      "Dest": "./api/frontend-dist"
+    },
+    {
+      "Src": "./frontend/src/workbox-config.js",
+      "Dest": "./api/frontend-dist"
+    }
+  ],
+  "Replace": [
+    {
+      "Pattern": "*.go|*.js|*.html",
+      "Search": "Something",
+      "Replace": "This"
+    }
+  ],
+  "ESBuild": {
+    "EntryPoints": [
+      "./frontend/src/the-app.js",
+      "./frontend/src/serviceworker.js"
+    ],
+    "Outdir":    "./api/frontend-dist",
+    "Sourcemap": 1,
+    "Format":    3,
+    "Splitting": true,
+    "Platform":  0,
+    "Bundle":    true,
+    "Write":     true,
+    "LogLevel":  3
+  }
+}

watch.go

@@ -0,0 +1,123 @@
+package main
+
+import (
+	"fmt"
+	"net/http"
+	"os"
+	"os/signal"
+	"path/filepath"
+	"syscall"
+	"time"
+
+	"github.com/jaschaephraim/lrserver"
+	"github.com/radovskyb/watcher"
+	"github.com/urfave/cli/v2"
+)
+
+func watchAction(ctx *cli.Context) error {
+	cfgPath := ctx.String("c")
+	os.Chdir(filepath.Dir(cfgPath))
+	optsSetups := readCfg(cfgPath)
+
+	c := make(chan os.Signal, 1)
+	signal.Notify(c, os.Interrupt, syscall.SIGTERM)
+
+	for i := range optsSetups {
+		opts := optsSetups[i]
+
+		go func(opts options) {
+			w := watcher.New()
+			w.SetMaxEvents(1)
+			w.FilterOps(watcher.Write, watcher.Rename, watcher.Move, watcher.Create, watcher.Remove)
+
+			if len(opts.Watch.Exclude) > 0 {
+				w.Ignore(opts.Watch.Exclude...)
+			}
+
+			if err := w.AddRecursive(opts.Watch.Path); err != nil {
+				fmt.Println(err.Error())
+				os.Exit(1)
+			}
+
+			go func() {
+				for {
+					select {
+					case event := <-w.Event:
+						fmt.Printf("File %s changed\n", event.Name())
+						cp(opts)
+						build(opts)
+						replace(opts)
+					case err := <-w.Error:
+						fmt.Println(err.Error())
+					case <-w.Closed:
+						return
+					}
+				}
+			}()
+
+			fmt.Printf("Watching %d elements in %s\n", len(w.WatchedFiles()), opts.Watch.Path)
+
+			cp(opts)
+			build(opts)
+			replace(opts)
+
+			if err := w.Start(time.Millisecond * 100); err != nil {
+				fmt.Println(err.Error())
+			}
+		}(opts)
+
+		if opts.Serve.Path != "" {
+			go func() {
+				port := 8888
+				if opts.Serve.Port != 0 {
+					port = opts.Serve.Port
+				}
+
+				http.Handle("/", http.FileServer(http.Dir(opts.Serve.Path)))
+
+				fmt.Printf("Serving contents of %s at :%d\n", opts.Serve.Path, port)
+				err := http.ListenAndServe(fmt.Sprintf(":%d", port), nil)
+
+				if err != nil {
+					fmt.Printf("%+v\n", err.Error())
+					os.Exit(1)
+				}
+			}()
+		}
+
+		if opts.Link.From != "" {
+			reqBuildCh := link(opts.Link.From, opts.Link.To)
+
+			go func() {
+				for range reqBuildCh {
+					cp(opts)
+					build(opts)
+					replace(opts)
+				}
+			}()
+		}
+	}
+
+	go func() {
+		fmt.Println("Starting live reload server")
+		lr := lrserver.New(lrserver.DefaultName, lrserver.DefaultPort)
+
+		go func() {
+			for {
+				<-triggerReload
+				lr.Reload("")
+			}
+		}()
+
+		lr.SetStatusLog(nil)
+		err := lr.ListenAndServe()
+		if err != nil {
+			panic(err)
+		}
+	}()
+
+	<-c
+	fmt.Println("\nStopped watching")
+
+	return nil
+}