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generate_command.go
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generate_command.go
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package main
import (
"bytes"
"flag"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strconv"
"strings"
"text/template"
)
func BuildGenerateCommand() *Command {
var (
agouti, noDot, internal bool
customTestFile string
)
flagSet := flag.NewFlagSet("generate", flag.ExitOnError)
flagSet.BoolVar(&agouti, "agouti", false, "If set, generate will generate a test file for writing Agouti tests")
flagSet.BoolVar(&noDot, "nodot", false, "If set, generate will generate a test file that does not . import ginkgo and gomega")
flagSet.BoolVar(&internal, "internal", false, "If set, generate will generate a test file that uses the regular package name")
flagSet.StringVar(&customTestFile, "template", "", "If specified, generate will use the contents of the file passed as the test file template")
return &Command{
Name: "generate",
FlagSet: flagSet,
UsageCommand: "ginkgo generate <filename(s)>",
Usage: []string{
"Generate a test file named filename_test.go",
"If the optional <filenames> argument is omitted, a file named after the package in the current directory will be created.",
"Accepts the following flags:",
},
Command: func(args []string, additionalArgs []string) {
generateSpec(args, agouti, noDot, internal, customTestFile)
},
}
}
var specText = `package {{.Package}}
import (
{{if .IncludeImports}}. "github.com/onsi/ginkgo"{{end}}
{{if .IncludeImports}}. "github.com/onsi/gomega"{{end}}
{{if .ImportPackage}}"{{.PackageImportPath}}"{{end}}
)
var _ = Describe("{{.Subject}}", func() {
})
`
var agoutiSpecText = `package {{.Package}}
import (
{{if .IncludeImports}}. "github.com/onsi/ginkgo"{{end}}
{{if .IncludeImports}}. "github.com/onsi/gomega"{{end}}
"github.com/sclevine/agouti"
. "github.com/sclevine/agouti/matchers"
{{if .ImportPackage}}"{{.PackageImportPath}}"{{end}}
)
var _ = Describe("{{.Subject}}", func() {
var page *agouti.Page
BeforeEach(func() {
var err error
page, err = agoutiDriver.NewPage()
Expect(err).NotTo(HaveOccurred())
})
AfterEach(func() {
Expect(page.Destroy()).To(Succeed())
})
})
`
type specData struct {
Package string
Subject string
PackageImportPath string
IncludeImports bool
ImportPackage bool
}
func generateSpec(args []string, agouti, noDot, internal bool, customTestFile string) {
if len(args) == 0 {
err := generateSpecForSubject("", agouti, noDot, internal, customTestFile)
if err != nil {
fmt.Println(err.Error())
fmt.Println("")
os.Exit(1)
}
fmt.Println("")
return
}
var failed bool
for _, arg := range args {
err := generateSpecForSubject(arg, agouti, noDot, internal, customTestFile)
if err != nil {
failed = true
fmt.Println(err.Error())
}
}
fmt.Println("")
if failed {
os.Exit(1)
}
}
func generateSpecForSubject(subject string, agouti, noDot, internal bool, customTestFile string) error {
packageName, specFilePrefix, formattedName := getPackageAndFormattedName()
if subject != "" {
specFilePrefix = formatSubject(subject)
formattedName = prettifyPackageName(specFilePrefix)
}
data := specData{
Package: determinePackageName(packageName, internal),
Subject: formattedName,
PackageImportPath: getPackageImportPath(),
IncludeImports: !noDot,
ImportPackage: !internal,
}
targetFile := fmt.Sprintf("%s_test.go", specFilePrefix)
if fileExists(targetFile) {
return fmt.Errorf("%s already exists.", targetFile)
} else {
fmt.Printf("Generating ginkgo test for %s in:\n %s\n", data.Subject, targetFile)
}
f, err := os.Create(targetFile)
if err != nil {
return err
}
defer f.Close()
var templateText string
if customTestFile != "" {
tpl, err := ioutil.ReadFile(customTestFile)
if err != nil {
panic(err.Error())
}
templateText = string(tpl)
} else if agouti {
templateText = agoutiSpecText
} else {
templateText = specText
}
specTemplate, err := template.New("spec").Parse(templateText)
if err != nil {
return err
}
specTemplate.Execute(f, data)
goFmt(targetFile)
return nil
}
func formatSubject(name string) string {
name = strings.Replace(name, "-", "_", -1)
name = strings.Replace(name, " ", "_", -1)
name = strings.Split(name, ".go")[0]
name = strings.Split(name, "_test")[0]
return name
}
// moduleName returns module name from go.mod from given module root directory
func moduleName(modRoot string) string {
modFile, err := os.Open(filepath.Join(modRoot, "go.mod"))
if err != nil {
return ""
}
mod := make([]byte, 128)
_, err = modFile.Read(mod)
if err != nil {
return ""
}
slashSlash := []byte("//")
moduleStr := []byte("module")
for len(mod) > 0 {
line := mod
mod = nil
if i := bytes.IndexByte(line, '\n'); i >= 0 {
line, mod = line[:i], line[i+1:]
}
if i := bytes.Index(line, slashSlash); i >= 0 {
line = line[:i]
}
line = bytes.TrimSpace(line)
if !bytes.HasPrefix(line, moduleStr) {
continue
}
line = line[len(moduleStr):]
n := len(line)
line = bytes.TrimSpace(line)
if len(line) == n || len(line) == 0 {
continue
}
if line[0] == '"' || line[0] == '`' {
p, err := strconv.Unquote(string(line))
if err != nil {
return "" // malformed quoted string or multiline module path
}
return p
}
return string(line)
}
return "" // missing module path
}
func findModuleRoot(dir string) (root string) {
dir = filepath.Clean(dir)
// Look for enclosing go.mod.
for {
if fi, err := os.Stat(filepath.Join(dir, "go.mod")); err == nil && !fi.IsDir() {
return dir
}
d := filepath.Dir(dir)
if d == dir {
break
}
dir = d
}
return ""
}
func getPackageImportPath() string {
workingDir, err := os.Getwd()
if err != nil {
panic(err.Error())
}
sep := string(filepath.Separator)
// Try go.mod file first
modRoot := findModuleRoot(workingDir)
if modRoot != "" {
modName := moduleName(modRoot)
if modName != "" {
cd := strings.Replace(workingDir, modRoot, "", -1)
cd = strings.ReplaceAll(cd, sep, "/")
return modName + cd
}
}
// Fallback to GOPATH structure
paths := strings.Split(workingDir, sep+"src"+sep)
if len(paths) == 1 {
fmt.Printf("\nCouldn't identify package import path.\n\n\tginkgo generate\n\nMust be run within a package directory under $GOPATH/src/...\nYou're going to have to change UNKNOWN_PACKAGE_PATH in the generated file...\n\n")
return "UNKNOWN_PACKAGE_PATH"
}
return filepath.ToSlash(paths[len(paths)-1])
}