github.com/cheikhshift/buffalo@v0.9.5/buffalo/cmd/new.go

package cmd

import (
	"errors"
	"fmt"
	"os"
	"os/user"
	"path/filepath"
	"regexp"
	"strings"

	"github.com/gobuffalo/buffalo/generators/newapp"
	"github.com/gobuffalo/envy"
	"github.com/gobuffalo/plush"
	"github.com/markbates/inflect"
	"github.com/spf13/cobra"
)

var rootPath string
var app = &newapp.App{}

var newCmd = &cobra.Command{
	Use:   "new [name]",
	Short: "Creates a new Buffalo application",
	RunE: func(cmd *cobra.Command, args []string) error {
		if !validDbType() {
			return fmt.Errorf("Unknown db-type %s expecting one of postgres, mysql or sqlite3", app.DBType)
		}

		if len(args) == 0 {
			return errors.New("you must enter a name for your new application")
		}

		app.Name = args[0]

		if forbiddenName() {
			return fmt.Errorf("name %s is not allowed, try a different application name", app.Name)
		}

		if nameHasIllegalCharacter(app.Name) {
			return fmt.Errorf("name %s is not allowed, application name can only be contain [a-Z0-9-_]", app.Name)
		}

		if app.Name == "." {
			app.Name = filepath.Base(app.RootPath)
		} else {
			app.RootPath = filepath.Join(app.RootPath, app.Name)
		}

		err := validateInGoPath()
		if err != nil {
			return err
		}

		s, _ := os.Stat(app.RootPath)
		if s != nil {
			if app.Force {
				os.RemoveAll(app.RootPath)
			} else {
				return fmt.Errorf("%s already exists! Either delete it or use the -f flag to force", app.Name)
			}
		}

		err = genNewFiles()
		if err != nil {
			return err
		}

		fmt.Printf("Congratulations! Your application, %s, has been successfully built!\n\n", app.Name)
		fmt.Println("You can find your new application at:")
		fmt.Println(app.RootPath)
		fmt.Println("\nPlease read the README.md file in your new application for next steps on running your application.")

		return nil
	},
}

func validDbType() bool {
	return app.DBType == "postgres" || app.DBType == "mysql" || app.DBType == "sqlite3"
}

func forbiddenName() bool {
	return contains(forbiddenAppNames, strings.ToLower(app.Name))
}

var nameRX = regexp.MustCompile("^[\\w-]+$")

func nameHasIllegalCharacter(name string) bool {
	return !nameRX.MatchString(name)
}

func validateInGoPath() error {
	gpMultiple := envy.GoPaths()

	var gp string
	larp := strings.ToLower(app.RootPath)
	for i := 0; i < len(gpMultiple); i++ {
		lgpm := strings.ToLower(filepath.Join(gpMultiple[i], "src"))
		if strings.HasPrefix(larp, lgpm) {
			gp = gpMultiple[i]
			break
		}
	}

	if gp == "" {
		u, err := user.Current()
		if err != nil {
			return err
		}
		pwd, _ := os.Getwd()
		t, err := plush.Render(notInGoWorkspace, plush.NewContextWith(map[string]interface{}{
			"name":     app.Name,
			"gopath":   envy.GoPath(),
			"current":  pwd,
			"username": u.Username,
		}))
		if err != nil {
			return err
		}
		fmt.Println(t)
		os.Exit(-1)
	}
	return nil
}

func goPath(root string) string {
	gpMultiple := envy.GoPaths()
	path := ""

	for i := 0; i < len(gpMultiple); i++ {
		if strings.HasPrefix(root, filepath.Join(gpMultiple[i], "src")) {
			path = gpMultiple[i]
			break
		}
	}
	return path
}

func packagePath(rootPath string) string {
	gosrcpath := strings.Replace(filepath.Join(goPath(rootPath), "src"), "\\", "/", -1)
	rootPath = strings.Replace(rootPath, "\\", "/", -1)
	return strings.Replace(rootPath, gosrcpath+"/", "", 2)
}

func genNewFiles() error {
	packagePath := packagePath(app.RootPath)

	data := map[string]interface{}{
		"appPath":     app.RootPath,
		"name":        app.Name,
		"titleName":   inflect.Titleize(app.Name),
		"packagePath": packagePath,
		"actionsPath": packagePath + "/actions",
		"modelsPath":  packagePath + "/models",
		"withPop":     !app.SkipPop,
		"withDep":     app.WithDep,
		"withWebpack": !app.SkipWebpack && !app.API,
		"skipYarn":    app.SkipYarn,
		"withYarn":    !app.SkipYarn,
		"dbType":      app.DBType,
		"version":     Version,
		"ciProvider":  app.CIProvider,
		"asAPI":       app.API,
		"asWeb":       !app.API,
		"docker":      app.Docker,
	}

	g, err := app.Generator(data)
	if err != nil {
		return err
	}
	return g.Run(app.RootPath, data)
}

func init() {
	pwd, _ := os.Getwd()

	rootPath = pwd
	app.RootPath = pwd

	decorate("new", newCmd)
	RootCmd.AddCommand(newCmd)
	newCmd.Flags().BoolVar(&app.API, "api", false, "skip all front-end code and configure for an API server")
	newCmd.Flags().BoolVarP(&app.Force, "force", "f", false, "delete and remake if the app already exists")
	newCmd.Flags().BoolVarP(&app.Verbose, "verbose", "v", false, "verbosely print out the go get commands")
	newCmd.Flags().BoolVar(&app.SkipPop, "skip-pop", false, "skips adding pop/soda to your app")
	newCmd.Flags().BoolVar(&app.WithDep, "with-dep", false, "adds github.com/golang/dep to your app")
	newCmd.Flags().BoolVar(&app.SkipWebpack, "skip-webpack", false, "skips adding Webpack to your app")
	newCmd.Flags().BoolVar(&app.SkipYarn, "skip-yarn", false, "skip to use npm as the asset package manager")
	newCmd.Flags().StringVar(&app.DBType, "db-type", "postgres", "specify the type of database you want to use [postgres, mysql, sqlite3]")
	newCmd.Flags().StringVar(&app.Docker, "docker", "multi", "specify the type of Docker file to generate [none, multi, standard]")
	newCmd.Flags().StringVar(&app.CIProvider, "ci-provider", "none", "specify the type of ci file you would like buffalo to generate [none, travis, gitlab-ci]")
}

func contains(s []string, e string) bool {
	for _, a := range s {
		if a == e {
			return true
		}
	}
	return false
}

var forbiddenAppNames = []string{"buffalo"}

const notInGoWorkspace = `Oops! It would appear that you are not in your Go Workspace.

Your $GOPATH is set to "<%= gopath %>".

You are currently in "<%= current %>".

The standard location for putting Go projects is something along the lines of "$GOPATH/src/github.com/<%= username %>/<%= name %>" (adjust accordingly).

We recommend you go to "$GOPATH/src/github.com/<%= username %>/" and try "buffalo new <%= name %>" again.`

const noGoPath = `You do not have a $GOPATH set. In order to work with Go, you must set up your $GOPATH and your Go Workspace.

We recommend reading this tutorial on setting everything up: https://www.goinggo.net/2016/05/installing-go-and-your-workspace.html

When you're ready come back and try again. Don't worry, Buffalo will be right here waiting for you. :)`