Add wails debug command

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

@@ -0,0 +1,123 @@
+package debug
+
+import (
+	"fmt"
+	"github.com/wailsapp/wails/v2/internal/shell"
+	"io"
+	"os"
+	"runtime"
+	"strings"
+	"time"
+
+	"github.com/leaanthony/clir"
+	"github.com/leaanthony/slicer"
+	"github.com/wailsapp/wails/v2/pkg/clilogger"
+	"github.com/wailsapp/wails/v2/pkg/commands/build"
+)
+
+// AddSubcommand adds the `debug` command for the Wails application
+func AddSubcommand(app *clir.Cli, w io.Writer) error {
+
+	outputType := "desktop"
+
+	validTargetTypes := slicer.String([]string{"desktop", "hybrid", "server"})
+
+	command := app.NewSubCommand("debug", "Builds the application then runs delve on the binary")
+
+	// Setup target type flag
+	description := "Type of application to build. Valid types: " + validTargetTypes.Join(",")
+	command.StringFlag("t", description, &outputType)
+
+	compilerCommand := "go"
+	command.StringFlag("compiler", "Use a different go compiler to build, eg go1.15beta1", &compilerCommand)
+
+	quiet := false
+	command.BoolFlag("q", "Suppress output to console", &quiet)
+
+	// ldflags to pass to `go`
+	ldflags := ""
+	command.StringFlag("ldflags", "optional ldflags", &ldflags)
+
+	// Log to file
+	logFile := ""
+	command.StringFlag("l", "Log to file", &logFile)
+
+	command.Action(func() error {
+
+		// Create logger
+		logger := clilogger.New(w)
+		logger.Mute(quiet)
+
+		// Validate output type
+		if !validTargetTypes.Contains(outputType) {
+			return fmt.Errorf("output type '%s' is not valid", outputType)
+		}
+
+		if !quiet {
+			app.PrintBanner()
+		}
+
+		task := fmt.Sprintf("Building %s Application", strings.Title(outputType))
+		logger.Println(task)
+		logger.Println(strings.Repeat("-", len(task)))
+
+		// Setup mode
+		mode := build.Debug
+
+		// Create BuildOptions
+		buildOptions := &build.Options{
+			Logger:     logger,
+			OutputType: outputType,
+			Mode:       mode,
+			Pack:       false,
+			Platform:   runtime.GOOS,
+			LDFlags:    ldflags,
+			Compiler:   compilerCommand,
+			KeepAssets: false,
+		}
+
+		outputFilename, err := doDebugBuild(buildOptions)
+		if err != nil {
+			return err
+		}
+
+		// Check delve exists
+		delveExists := shell.CommandExists("dlv")
+		if !delveExists {
+			return fmt.Errorf("cannot launch delve (Is it installed?)")
+		}
+
+		// Get cwd
+		cwd, err := os.Getwd()
+		if err != nil {
+			return err
+		}
+
+		// Launch delve
+		println("Launching Delve on port 2345...")
+		command := shell.CreateCommand(cwd, "dlv", "--listen=:2345", "--headless=true", "--api-version=2", "--accept-multiclient", "exec", outputFilename)
+		return command.Run()
+	})
+
+	return nil
+}
+
+// doDebugBuild is our main build command
+func doDebugBuild(buildOptions *build.Options) (string, error) {
+
+	// Start Time
+	start := time.Now()
+
+	outputFilename, err := build.Build(buildOptions)
+	if err != nil {
+		return "", err
+	}
+
+	// Output stats
+	elapsed := time.Since(start)
+	buildOptions.Logger.Println("")
+	buildOptions.Logger.Println(fmt.Sprintf("Built '%s' in %s.", outputFilename, elapsed.Round(time.Millisecond).String()))
+	buildOptions.Logger.Println("")
+
+	return outputFilename, nil
+}

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

@@ -85,7 +85,10 @@ func AddSubcommand(app *clir.Cli, w io.Writer) error {
 				// If this is a folder, add it to our watch list
 				if fs.DirExists(event.Name) {
 					if !strings.Contains(event.Name, "node_modules") {
-						watcher.Add(event.Name)
+						err := watcher.Add(event.Name)
+						if err != nil {
+							logger.Fatal("%s", err.Error())
+						}
 						logger.Println("Watching directory: %s", event.Name)
 					}
 				}
@@ -173,7 +176,10 @@ func AddSubcommand(app *clir.Cli, w io.Writer) error {
 
 		// Kill the current program if running
 		if debugBinaryProcess != nil {
-			debugBinaryProcess.Kill()
+			err := debugBinaryProcess.Kill()
+			if err != nil {
+				return err
+			}
 		}
 
 		logger.Println("Development mode exited")
@@ -231,7 +237,10 @@ func restartApp(logger *clilogger.CLILogger, outputType string, ldflags string,
 	err = newProcess.Start()
 	if err != nil {
 		// Remove binary
-		fs.DeleteFile(appBinary)
+		deleteError := fs.DeleteFile(appBinary)
+		if deleteError != nil {
+			logger.Fatal("Unable to delete app binary: " + appBinary)
+		}
 		logger.Fatal("Unable to start application: %s", err.Error())
 	}
 

v2/cmd/wails/main.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/leaanthony/clir"
 	"github.com/wailsapp/wails/v2/cmd/wails/internal/commands/build"
+	"github.com/wailsapp/wails/v2/cmd/wails/internal/commands/debug"
 	"github.com/wailsapp/wails/v2/cmd/wails/internal/commands/dev"
 	"github.com/wailsapp/wails/v2/cmd/wails/internal/commands/doctor"
 	"github.com/wailsapp/wails/v2/cmd/wails/internal/commands/generate"
@@ -27,6 +28,11 @@ func main() {
 	if err != nil {
 		fatal(err.Error())
 	}
+
+	err = debug.AddSubcommand(app, os.Stdout)
+	if err != nil {
+		fatal(err.Error())
+	}
 	err = doctor.AddSubcommand(app, os.Stdout)
 	if err != nil {
 		fatal(err.Error())