Add overwrite confirmation for file creation

cmd/project.go

@@ -1,8 +1,10 @@
 package cmd
 
 import (
+	"bufio"
 	"fmt"
 	"os"
+	"strings"
 	"text/template"
 
 	"github.com/spf13/cobra"
@@ -26,64 +28,148 @@ type Command struct {
 	*Project
 }
 
+const (
+	mainFilePathTemplate    = "%s/main.go"
+	rootFilePathTemplate    = "%s/cmd/root.go"
+	licenseFilePathTemplate = "%s/LICENSE"
+	cmdDirPathTemplate      = "%s/cmd"
+)
+
 func (p *Project) Create() error {
-	// check if AbsolutePath exists
-	if _, err := os.Stat(p.AbsolutePath); os.IsNotExist(err) {
-		// create directory
-		if err := os.Mkdir(p.AbsolutePath, 0754); err != nil {
-			return err
+	existingFiles := p.checkExistingFiles()
+	if len(existingFiles) > 0 {
+		fmt.Println("The following files already exist and will be overwritten:")
+		for _, file := range existingFiles {
+			fmt.Printf("  - %s\n", file)
+		}
+		fmt.Println()
+		if !readConfirmation() {
+			return fmt.Errorf("operation cancelled")
 		}
 	}
 
-	// create main.go
-	mainFile, err := os.Create(fmt.Sprintf("%s/main.go", p.AbsolutePath))
-	if err != nil {
+	if err := p.createDirectory(); err != nil {
 		return err
 	}
-	defer mainFile.Close()
 
-	mainTemplate := template.Must(template.New("main").Parse(string(tpl.MainTemplate())))
-	err = mainTemplate.Execute(mainFile, p)
-	if err != nil {
+	if err := p.createMainFile(); err != nil {
 		return err
 	}
 
-	// create cmd/root.go
-	if _, err = os.Stat(fmt.Sprintf("%s/cmd", p.AbsolutePath)); os.IsNotExist(err) {
-		cobra.CheckErr(os.Mkdir(fmt.Sprintf("%s/cmd", p.AbsolutePath), 0751))
+	if err := p.createRootFile(); err != nil {
+		return err
+	}
+
+	if err := p.createLicenseFile(); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (p *Project) checkExistingFiles() []string {
+	var files []string
+
+	mainPath := fmt.Sprintf(mainFilePathTemplate, p.AbsolutePath)
+	rootPath := fmt.Sprintf(rootFilePathTemplate, p.AbsolutePath)
+	licensePath := fmt.Sprintf(licenseFilePathTemplate, p.AbsolutePath)
+
+	if _, err := os.Stat(mainPath); err == nil {
+		files = append(files, mainPath)
+	}
+	if _, err := os.Stat(rootPath); err == nil {
+		files = append(files, rootPath)
+	}
+	if _, err := os.Stat(licensePath); err == nil {
+		files = append(files, licensePath)
+	}
+
+	return files
+}
+
+
+func readConfirmation() bool {
+	fmt.Println("Do you want to continue? This will overwrite the existing files.")
+	fmt.Print("Continue? (Y/N): ")
+	reader := bufio.NewReader(os.Stdin)
+	input, err := reader.ReadString('\n')
+	if err != nil {
+		return false
+	}
+
+	input = strings.TrimSpace(strings.ToLower(input))
+	if input != "y" && input != "yes" {
+		fmt.Println("Operation cancelled.")
+		return false
 	}
-	rootFile, err := os.Create(fmt.Sprintf("%s/cmd/root.go", p.AbsolutePath))
+
+	return true
+}
+
+func (p *Project) createDirectory() error {
+	if _, err := os.Stat(p.AbsolutePath); os.IsNotExist(err) {
+		return os.Mkdir(p.AbsolutePath, 0754)
+	}
+	return nil
+}
+
+func (p *Project) createMainFile() error {
+	mainPath := fmt.Sprintf(mainFilePathTemplate, p.AbsolutePath)
+	mainFile, err := os.Create(mainPath)
 	if err != nil {
 		return err
 	}
-	defer rootFile.Close()
+	defer mainFile.Close()
 
-	rootTemplate := template.Must(template.New("root").Parse(string(tpl.RootTemplate())))
-	err = rootTemplate.Execute(rootFile, p)
+	mainTemplate := template.Must(template.New("main").Parse(string(tpl.MainTemplate())))
+	return mainTemplate.Execute(mainFile, p)
+}
+
+func (p *Project) createRootFile() error {
+	cmdPath := fmt.Sprintf(cmdDirPathTemplate, p.AbsolutePath)
+	rootPath := fmt.Sprintf(rootFilePathTemplate, p.AbsolutePath)
+
+	if _, err := os.Stat(cmdPath); os.IsNotExist(err) {
+		cobra.CheckErr(os.Mkdir(cmdPath, 0751))
+	}
+
+	rootFile, err := os.Create(rootPath)
 	if err != nil {
 		return err
 	}
+	defer rootFile.Close()
 
-	// create license
-	return p.createLicenseFile()
+	rootTemplate := template.Must(template.New("root").Parse(string(tpl.RootTemplate())))
+	return rootTemplate.Execute(rootFile, p)
 }
 
 func (p *Project) createLicenseFile() error {
-	data := map[string]interface{}{
-		"copyright": copyrightLine(),
-	}
-	licenseFile, err := os.Create(fmt.Sprintf("%s/LICENSE", p.AbsolutePath))
+	licensePath := fmt.Sprintf(licenseFilePathTemplate, p.AbsolutePath)
+	licenseFile, err := os.Create(licensePath)
 	if err != nil {
 		return err
 	}
 	defer licenseFile.Close()
 
+	data := map[string]interface{}{
+		"copyright": copyrightLine(),
+	}
 	licenseTemplate := template.Must(template.New("license").Parse(p.Legal.Text))
 	return licenseTemplate.Execute(licenseFile, data)
 }
 
 func (c *Command) Create() error {
-	cmdFile, err := os.Create(fmt.Sprintf("%s/cmd/%s.go", c.AbsolutePath, c.CmdName))
+	cmdDirPath := fmt.Sprintf(cmdDirPathTemplate, c.AbsolutePath)
+	cmdFilePath := fmt.Sprintf("%s/%s.go", cmdDirPath, c.CmdName)
+
+	if _, err := os.Stat(cmdFilePath); err == nil {
+		fmt.Printf("File %s already exists and will be overwritten.\n", cmdFilePath)
+		if !readConfirmation() {
+			return  fmt.Errorf("operation cancelled")
+		}
+	}
+
+	cmdFile, err := os.Create(cmdFilePath)
 	if err != nil {
 		return err
 	}