Feature/auto devserver port (#1547)

* Support "auto" devserverurl

v2/cmd/wails/internal/commands/dev/dev.go

@@ -183,6 +183,19 @@ func AddSubcommand(app *clir.Cli, w io.Writer) error {
 		signal.Notify(quitChannel, os.Interrupt, os.Kill, syscall.SIGTERM)
 		exitCodeChannel := make(chan int, 1)
 
+		// frontend:dev:watcher command.
+		if command := projectConfig.DevWatcherCommand; command != "" {
+			closer, devServerURL, err := runFrontendDevWatcherCommand(cwd, command, projectConfig.FrontendDevServerURL == "auto")
+			if err != nil {
+				return err
+			}
+			if devServerURL != "" {
+				projectConfig.FrontendDevServerURL = devServerURL
+				flags.frontendDevServerURL = devServerURL
+			}
+			defer closer()
+		}
+
 		// Do initial build
 		logger.Println("Building application for development...")
 		debugBinaryProcess, appBinary, err := restartApp(buildOptions, nil, flags, exitCodeChannel)
@@ -195,15 +208,6 @@ func AddSubcommand(app *clir.Cli, w io.Writer) error {
 			}
 		}()
 
-		// frontend:dev:watcher command.
-		if command := projectConfig.DevWatcherCommand; command != "" {
-			closer, err := runFrontendDevWatcherCommand(cwd, command)
-			if err != nil {
-				return err
-			}
-			defer closer()
-		}
-
 		// open browser
 		if flags.openBrowser {
 			err = browser.OpenURL(devServerURL.String())
@@ -232,6 +236,12 @@ func AddSubcommand(app *clir.Cli, w io.Writer) error {
 		}
 		LogGreen("Using reload debounce setting of %d milliseconds", flags.debounceMS)
 
+		// Show dev server URL in terminal after 3 seconds
+		go func() {
+			time.Sleep(3 * time.Second)
+			LogGreen("\n\nTo develop in the browser, navigate to: %s", devServerURL)
+		}()
+
 		// Watch for changes and trigger restartApp()
 		debugBinaryProcess = doWatcherLoop(buildOptions, debugBinaryProcess, flags, watcher, exitCodeChannel, quitChannel, devServerURL)
 
@@ -411,18 +421,31 @@ func loadAndMergeProjectConfig(cwd string, flags *devFlags) (*project.Project, e
 }
 
 // runFrontendDevWatcherCommand will run the `frontend:dev:watcher` command if it was given, ex- `npm run dev`
-func runFrontendDevWatcherCommand(cwd string, devCommand string) (func(), error) {
+func runFrontendDevWatcherCommand(cwd string, devCommand string, discoverViteServerURL bool) (func(), string, error) {
 	ctx, cancel := context.WithCancel(context.Background())
+	scanner := NewStdoutScanner()
 	dir := filepath.Join(cwd, "frontend")
 	cmdSlice := strings.Split(devCommand, " ")
 	cmd := exec.CommandContext(ctx, cmdSlice[0], cmdSlice[1:]...)
 	cmd.Stderr = os.Stderr
-	cmd.Stdout = os.Stdout
+	cmd.Stdout = scanner
 	cmd.Dir = dir
 	setParentGID(cmd)
+
 	if err := cmd.Start(); err != nil {
 		cancel()
-		return nil, fmt.Errorf("Unable to start frontend DevWatcher: %w", err)
+		return nil, "", fmt.Errorf("unable to start frontend DevWatcher: %w", err)
+	}
+
+	var viteServerURL string
+	if discoverViteServerURL {
+		select {
+		case serverURL := <-scanner.ViteServerURLChan:
+			viteServerURL = serverURL
+		case <-time.After(time.Second * 10):
+			cancel()
+			return nil, "", errors.New("failed to find Vite server URL")
+		}
 	}
 
 	LogGreen("Running frontend DevWatcher command: '%s'", devCommand)
@@ -443,7 +466,7 @@ func runFrontendDevWatcherCommand(cwd string, devCommand string) (func(), error)
 		LogGreen("DevWatcher command killed!")
 		cancel()
 		wg.Wait()
-	}, nil
+	}, viteServerURL, nil
 }
 
 // initialiseWatcher creates the project directory watcher that will trigger recompile
@@ -550,12 +573,12 @@ func doWatcherLoop(buildOptions *build.Options, debugBinaryProcess *process.Proc
 		if dir == "" {
 			continue
 		}
-		path, err := filepath.Abs(dir)
+		thePath, err := filepath.Abs(dir)
 		if err != nil {
 			LogRed("Unable to expand reloadDir '%s': %s", dir, err)
 			continue
 		}
-		dirsThatTriggerAReload = append(dirsThatTriggerAReload, path)
+		dirsThatTriggerAReload = append(dirsThatTriggerAReload, thePath)
 	}
 
 	quit := false
@@ -661,8 +684,8 @@ func doWatcherLoop(buildOptions *build.Options, debugBinaryProcess *process.Proc
 				}
 
 				if assetDir != "" {
-					for path := range changedPaths {
+					for thePath := range changedPaths {
-						if strings.HasPrefix(path, assetDir) {
+						if strings.HasPrefix(thePath, assetDir) {
 							reload = true
 							break
 						}

v2/cmd/wails/internal/commands/dev/stdout_scanner.go

@@ -0,0 +1,45 @@
+package dev
+
+import (
+	"bufio"
+	"bytes"
+	"github.com/acarl005/stripansi"
+	"net/url"
+	"os"
+	"strings"
+)
+
+// stdoutScanner acts as a stdout target that will scan the incoming
+// data to find out the vite server url
+type stdoutScanner struct {
+	ViteServerURLChan chan string
+}
+
+// NewStdoutScanner creates a new stdoutScanner
+func NewStdoutScanner() *stdoutScanner {
+	return &stdoutScanner{
+		ViteServerURLChan: make(chan string, 2),
+	}
+}
+
+// Write bytes to the scanner. Will copy the bytes to stdout
+func (s *stdoutScanner) Write(data []byte) (n int, err error) {
+	match := bytes.Index(data, []byte("> Local:"))
+	if match != -1 {
+		sc := bufio.NewScanner(strings.NewReader(string(data)))
+		for sc.Scan() {
+			line := sc.Text()
+			index := strings.Index(line, "Local:")
+			line = strings.TrimSpace(line[index+6:])
+			viteServerURL := stripansi.Strip(line)
+			LogGreen("Vite Server URL: %s", viteServerURL)
+			_, err := url.Parse(viteServerURL)
+			if err != nil {
+				LogRed(err.Error())
+			} else {
+				s.ViteServerURLChan <- viteServerURL
+			}
+		}
+	}
+	return os.Stdout.Write(data)
+}

v2/cmd/wails/internal/commands/initialise/templates/base/wails.tmpl.json

@@ -4,7 +4,7 @@
   "frontend:install": "npm install",
   "frontend:build": "npm run build",
   "frontend:dev:watcher": "npm run dev",
-  "frontend:dev:serverUrl": "http://localhost:3000",
+  "frontend:dev:serverUrl": "auto",
   "author": {
     "name": "{{.AuthorName}}",
     "email": "{{.AuthorEmail}}"

v2/cmd/wails/internal/commands/initialise/templates/templates/lit-ts/wails.tmpl.json

@@ -4,7 +4,7 @@
   "frontend:install": "npm install",
   "frontend:build": "npm run build",
   "frontend:dev:watcher": "npm run dev",
-  "frontend:dev:serverUrl": "http://localhost:3000",
+  "frontend:dev:serverUrl": "auto",
   "author": {
     "name": "{{.AuthorName}}",
     "email": "{{.AuthorEmail}}"

v2/cmd/wails/internal/commands/initialise/templates/templates/lit/wails.tmpl.json

@@ -4,7 +4,7 @@
   "frontend:install": "npm install",
   "frontend:build": "npm run build",
   "frontend:dev:watcher": "npm run dev",
-  "frontend:dev:serverUrl": "http://localhost:3000",
+  "frontend:dev:serverUrl": "auto",
   "author": {
     "name": "{{.AuthorName}}",
     "email": "{{.AuthorEmail}}"

v2/cmd/wails/internal/commands/initialise/templates/templates/plain/main.tmpl.go

@@ -1,83 +0,0 @@
-package main
-
-import (
-	"embed"
-	"log"
-
-	"github.com/wailsapp/wails/v2/pkg/options/mac"
-
-	"github.com/wailsapp/wails/v2"
-	"github.com/wailsapp/wails/v2/pkg/logger"
-	"github.com/wailsapp/wails/v2/pkg/options"
-	"github.com/wailsapp/wails/v2/pkg/options/windows"
-)
-
-//go:embed frontend/src
-var assets embed.FS
-
-//go:embed build/appicon.png
-var icon []byte
-
-func main() {
-	// Create an instance of the app structure
-	app := NewApp()
-
-	// Create application with options
-	err := wails.Run(&options.App{
-		Title:             "{{.ProjectName}}",
-		Width:             1024,
-		Height:            768,
-		MinWidth:          1024,
-		MinHeight:         768,
-		MaxWidth:          1280,
-		MaxHeight:         800,
-		DisableResize:     false,
-		Fullscreen:        false,
-		Frameless:         false,
-		StartHidden:       false,
-		HideWindowOnClose: false,
-		BackgroundColour:  &options.RGBA{R: 27, G: 38, B: 54, A: 1},
-		Assets:            assets,
-		Menu:              nil,
-		Logger:            nil,
-		LogLevel:          logger.DEBUG,
-		OnStartup:         app.startup,
-		OnDomReady:        app.domReady,
-		OnBeforeClose:     app.beforeClose,
-		OnShutdown:        app.shutdown,
-		WindowStartState:  options.Normal,
-		Bind: []interface{}{
-			app,
-		},
-		// Windows platform specific options
-		Windows: &windows.Options{
-			WebviewIsTransparent: false,
-			WindowIsTranslucent:  false,
-			DisableWindowIcon:    false,
-			// DisableFramelessWindowDecorations: false,
-			WebviewUserDataPath: "",
-		},
-		Mac: &mac.Options{
-			TitleBar: &mac.TitleBar{
-				TitlebarAppearsTransparent: true,
-				HideTitle:                  false,
-				HideTitleBar:               false,
-				FullSizeContent:            false,
-				UseToolbar:                 false,
-				HideToolbarSeparator:       true,
-			},
-			Appearance:           mac.NSAppearanceNameDarkAqua,
-			WebviewIsTransparent: true,
-			WindowIsTranslucent:  true,
-			About: &mac.AboutInfo{
-				Title:   "Plain Template",
-				Message: "Part of the Wails projects",
-				Icon:    icon,
-			},
-		},
-	})
-
-	if err != nil {
-		log.Fatal(err)
-	}
-}

v2/cmd/wails/internal/commands/initialise/templates/templates/preact-ts/wails.tmpl.json

@@ -4,7 +4,7 @@
   "frontend:install": "npm install",
   "frontend:build": "npm run build",
   "frontend:dev:watcher": "npm run dev",
-  "frontend:dev:serverUrl": "http://localhost:3000",
+  "frontend:dev:serverUrl": "auto",
   "author": {
     "name": "{{.AuthorName}}",
     "email": "{{.AuthorEmail}}"

v2/cmd/wails/internal/commands/initialise/templates/templates/preact/wails.tmpl.json

@@ -4,7 +4,7 @@
   "frontend:install": "npm install",
   "frontend:build": "npm run build",
   "frontend:dev:watcher": "npm run dev",
-  "frontend:dev:serverUrl": "http://localhost:3000",
+  "frontend:dev:serverUrl": "auto",
   "author": {
     "name": "{{.AuthorName}}",
     "email": "{{.AuthorEmail}}"

v2/cmd/wails/internal/commands/initialise/templates/templates/react-ts/wails.tmpl.json

@@ -4,7 +4,7 @@
   "frontend:install": "npm install",
   "frontend:build": "npm run build",
   "frontend:dev:watcher": "npm run dev",
-  "frontend:dev:serverUrl": "http://localhost:3000",
+  "frontend:dev:serverUrl": "auto",
   "author": {
     "name": "{{.AuthorName}}",
     "email": "{{.AuthorEmail}}"

v2/cmd/wails/internal/commands/initialise/templates/templates/react/wails.tmpl.json

@@ -4,7 +4,7 @@
   "frontend:install": "npm install",
   "frontend:build": "npm run build",
   "frontend:dev:watcher": "npm run dev",
-  "frontend:dev:serverUrl": "http://localhost:3000",
+  "frontend:dev:serverUrl": "auto",
   "author": {
     "name": "{{.AuthorName}}",
     "email": "{{.AuthorEmail}}"

v2/cmd/wails/internal/commands/initialise/templates/templates/svelte-ts/wails.tmpl.json

@@ -4,7 +4,7 @@
   "frontend:install": "npm install",
   "frontend:build": "npm run build",
   "frontend:dev:watcher": "npm run dev",
-  "frontend:dev:serverUrl": "http://localhost:3000",
+  "frontend:dev:serverUrl": "auto",
   "author": {
     "name": "{{.AuthorName}}",
     "email": "{{.AuthorEmail}}"

v2/cmd/wails/internal/commands/initialise/templates/templates/svelte/wails.tmpl.json

@@ -4,7 +4,7 @@
   "frontend:install": "npm install",
   "frontend:build": "npm run build",
   "frontend:dev:watcher": "npm run dev",
-  "frontend:dev:serverUrl": "http://localhost:3000",
+  "frontend:dev:serverUrl": "auto",
   "author": {
     "name": "{{.AuthorName}}",
     "email": "{{.AuthorEmail}}"

v2/cmd/wails/internal/commands/initialise/templates/templates/vanilla-ts/wails.tmpl.json

@@ -4,7 +4,7 @@
   "frontend:install": "npm install",
   "frontend:build": "npm run build",
   "frontend:dev:watcher": "npm run dev",
-  "frontend:dev:serverUrl": "http://localhost:3000",
+  "frontend:dev:serverUrl": "auto",
   "author": {
     "name": "{{.AuthorName}}",
     "email": "{{.AuthorEmail}}"

v2/cmd/wails/internal/commands/initialise/templates/templates/vanilla/wails.tmpl.json

@@ -4,7 +4,7 @@
   "frontend:install": "npm install",
   "frontend:build": "npm run build",
   "frontend:dev:watcher": "npm run dev",
-  "frontend:dev:serverUrl": "http://localhost:3000",
+  "frontend:dev:serverUrl": "auto",
   "author": {
     "name": "{{.AuthorName}}",
     "email": "{{.AuthorEmail}}"

v2/cmd/wails/internal/commands/initialise/templates/templates/vue-ts/frontend/package.json

@@ -14,6 +14,7 @@
     "@vitejs/plugin-vue": "^2.3.3",
     "typescript": "^4.5.4",
     "vite": "^2.9.9",
-    "vue-tsc": "^0.34.7"
+    "vue-tsc": "^0.34.7",
+    "@babel/types": "^7.17.10"
   }
 }

v2/cmd/wails/internal/commands/initialise/templates/templates/vue-ts/wails.tmpl.json

@@ -4,7 +4,7 @@
   "frontend:install": "npm install",
   "frontend:build": "npm run build",
   "frontend:dev:watcher": "npm run dev",
-  "frontend:dev:serverUrl": "http://localhost:3000",
+  "frontend:dev:serverUrl": "auto",
   "author": {
     "name": "{{.AuthorName}}",
     "email": "{{.AuthorEmail}}"

v2/cmd/wails/internal/commands/initialise/templates/templates/vue/wails.tmpl.json

@@ -4,7 +4,7 @@
   "frontend:install": "npm install",
   "frontend:build": "npm run build",
   "frontend:dev:watcher": "npm run dev",
-  "frontend:dev:serverUrl": "http://localhost:3000",
+  "frontend:dev:serverUrl": "auto",
   "author": {
     "name": "{{.AuthorName}}",
     "email": "{{.AuthorEmail}}"

v2/go.mod

@@ -38,6 +38,7 @@ require (
 )
 
 require (
+	github.com/acarl005/stripansi v0.0.0-20180116102854-5a71ef0e047d
 	github.com/bep/debounce v1.2.1
 	github.com/bitfield/script v0.19.0
 	github.com/go-ole/go-ole v1.2.6

v2/go.sum

@@ -5,6 +5,8 @@ github.com/Masterminds/semver v1.5.0/go.mod h1:MB6lktGJrhw8PrUyiEoblNEGEQ+RzHPF0
 github.com/Microsoft/go-winio v0.4.14/go.mod h1:qXqCSQ3Xa7+6tgxaGTIe4Kpcdsi+P8jBhyzoq1bpyYA=
 github.com/Microsoft/go-winio v0.4.16 h1:FtSW/jqD+l4ba5iPBj9CODVtgfYAD8w2wS923g/cFDk=
 github.com/Microsoft/go-winio v0.4.16/go.mod h1:XB6nPKklQyQ7GC9LdcBEcBl8PF76WugXOPRXwdLnMv0=
+github.com/acarl005/stripansi v0.0.0-20180116102854-5a71ef0e047d h1:licZJFw2RwpHMqeKTCYkitsPqHNxTmd4SNR5r94FGM8=
+github.com/acarl005/stripansi v0.0.0-20180116102854-5a71ef0e047d/go.mod h1:asat636LX7Bqt5lYEZ27JNDcqxfjdBQuJ/MM4CN/Lzo=
 github.com/alcortesm/tgz v0.0.0-20161220082320-9c5fe88206d7 h1:uSoVVbwJiQipAclBbw+8quDsfcvFjOpI5iCf4p/cqCs=
 github.com/alcortesm/tgz v0.0.0-20161220082320-9c5fe88206d7/go.mod h1:6zEj6s6u/ghQa61ZWa/C2Aw3RkjiTBOix7dkqa1VLIs=
 github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239 h1:kFOfPq6dUM1hTo4JG6LR5AXSUEsOjtdm0kw0FtQtMJA=

website/docs/reference/project-config.mdx

@@ -15,7 +15,7 @@ The project config resides in the `wails.json` file in the project directory. Th
 	"frontend:build": "[The command to build the assets, run in the frontend directory - often `npm run build`]",
 	"frontend:dev": "[This command is the dev equivalent of frontend:build. If not specified falls back to frontend:build]",
 	"frontend:dev:watcher": "[This command is run in a separate process on `wails dev`. Useful for 3rd party watchers or starting 3d party dev servers]",
-	"frontend:dev:serverUrl": "[URL to a 3rd party dev server to be used to serve assets, EG Vite",
+	"frontend:dev:serverUrl": "[URL to a 3rd party dev server to be used to serve assets, EG Vite. If this is set to 'auto' then the devServerUrl will be inferred from the Vite output]",
     "wailsjsdir": "[Relative path to the directory that the auto-generated JS modules will be created]",
 	"version": "[Project config version]",
 	"outputfilename": "[The name of the binary]",