feat: Install NPM Package

cmd/program.go

@@ -100,6 +100,19 @@ func (p *ProgramHelper) InstallGoPackage(packageName string) error {
 	return err
 }
 
+// InstallNPMPackage installs the given npm package
+func (p *ProgramHelper) InstallNPMPackage(packageName string, save bool) error {
+	args := strings.Split("install "+packageName, " ")
+	if save {
+		args = append(args, "--save")
+	}
+	_, stderr, err := p.shell.Run("npm", args...)
+	if err != nil {
+		fmt.Println(stderr)
+	}
+	return err
+}
+
 // RunCommand runs the given command
 func (p *ProgramHelper) RunCommand(command string) error {
 	args := strings.Split(command, " ")

cmd/project.go

@@ -13,12 +13,16 @@ import (
 	"github.com/leaanthony/slicer"
 )
 
+// PackageManager indicates different package managers
 type PackageManager int
 
 const (
-	unknown PackageManager = iota
-	npm
-	yarn
+	// UNKNOWN package manager
+	UNKNOWN PackageManager = iota
+	// NPM package manager
+	NPM
+	// YARN package manager
+	YARN
 )
 
 type author struct {
@@ -161,20 +165,21 @@ func (po *ProjectOptions) Defaults() {
 	po.WailsVersion = Version
 }
 
+// GetNPMBinaryName returns the type of package manager used by the project
 func (po *ProjectOptions) GetNPMBinaryName() (PackageManager, error) {
 	if po.FrontEnd == nil {
-		return unknown, fmt.Errorf("No frontend specified in project options")
+		return UNKNOWN, fmt.Errorf("No frontend specified in project options")
 	}
 
 	if strings.Index(po.FrontEnd.Install, "npm") > -1 {
-		return npm, nil
+		return NPM, nil
 	}
 
 	if strings.Index(po.FrontEnd.Install, "yarn") > -1 {
-		return yarn, nil
+		return YARN, nil
 	}
 
-	return unknown, nil
+	return UNKNOWN, nil
 }
 
 // PromptForInputs asks the user to input project details

cmd/wails/15_migrate.go

@@ -20,6 +20,7 @@ var checkSpinner = spinner.NewSpinner()
 var migrateProjectOptions = &cmd.ProjectOptions{}
 var migrateFS = cmd.NewFSHelper()
 var migrateGithub = cmd.NewGitHubHelper()
+var programHelper = cmd.NewProgramHelper()
 var lessThanV1 *semver.Constraints
 
 // The user's go.mod
@@ -30,6 +31,9 @@ var goModFile string
 var mainJSFile string
 var mainJSContents string
 
+// Frontend directory
+var frontEndDir string
+
 func init() {
 
 	var dryrun bool
@@ -147,6 +151,12 @@ func init() {
 			}
 		}
 
+		// Install runtime
+		err = installWailsRuntime()
+		if err != nil {
+			return err
+		}
+
 		return nil
 	})
 }
@@ -230,7 +240,7 @@ func checkWailsBridge() (string, error) {
 		return "", fmt.Errorf("Unable to determine frontend directory")
 	}
 
-	frontEndDir := migrateProjectOptions.FrontEnd.Dir
+	frontEndDir = migrateProjectOptions.FrontEnd.Dir
 
 	wailsBridgePath, err := filepath.Abs(filepath.Join(".", frontEndDir, "src", "wailsbridge.js"))
 	if err != nil {
@@ -263,7 +273,7 @@ func checkMainJS() (bool, error) {
 		return false, fmt.Errorf("Unable to determine frontend directory")
 	}
 
-	frontEndDir := migrateProjectOptions.FrontEnd.Dir
+	frontEndDir = migrateProjectOptions.FrontEnd.Dir
 
 	mainJSFile, err = filepath.Abs(filepath.Join(".", frontEndDir, "src", "main.js"))
 	if err != nil {
@@ -360,3 +370,34 @@ func patchMainJS() error {
 	checkSpinner.Success()
 	return nil
 }
+
+func installWailsRuntime() error {
+
+	checkSpinner.Start("Installing @wailsapp/runtime module")
+
+	// Change to the frontend directory
+	err := os.Chdir(frontEndDir)
+	if err != nil {
+		checkSpinner.Error()
+		return nil
+	}
+
+	// Determine package manager
+	packageManager, err := migrateProjectOptions.GetNPMBinaryName()
+	if err != nil {
+		checkSpinner.Error()
+		return nil
+	}
+
+	switch packageManager {
+	case cmd.NPM:
+		// npm install --save @wailsapp/runtime
+		programHelper.InstallNPMPackage("@wailsapp/runtime", true)
+	default:
+		checkSpinner.Error()
+		return fmt.Errorf("Unknown package manager")
+	}
+
+	checkSpinner.Success()
+	return nil
+}

go.mod

@@ -29,3 +29,5 @@ require (
 	gopkg.in/AlecAivazis/survey.v1 v1.8.4
 	gopkg.in/yaml.v3 v3.0.0-20190709130402-674ba3eaed22
 )
+
+go 1.13