forked from urfave/cli
/
main.go
293 lines (237 loc) · 6.54 KB
/
main.go
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package main
import (
"bytes"
"context"
_ "embed"
"log"
"os"
"os/exec"
"os/signal"
"path/filepath"
"sort"
"strings"
"syscall"
"text/template"
"github.com/urfave/cli/v2"
"golang.org/x/text/cases"
"golang.org/x/text/language"
"gopkg.in/yaml.v3"
)
const (
defaultPackageName = "cli"
)
var (
//go:embed generated.gotmpl
TemplateString string
//go:embed generated_test.gotmpl
TestTemplateString string
titler = cases.Title(language.Und, cases.NoLower)
)
func sh(ctx context.Context, exe string, args ...string) (string, error) {
cmd := exec.CommandContext(ctx, exe, args...)
cmd.Stderr = os.Stderr
outBytes, err := cmd.Output()
return string(outBytes), err
}
func main() {
ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
defer stop()
top := "../../"
if v, err := sh(ctx, "git", "rev-parse", "--show-toplevel"); err == nil {
top = strings.TrimSpace(v)
}
app := &cli.App{
Name: "genflags",
Usage: "Generate flag types for urfave/cli",
Flags: []cli.Flag{
&cli.PathFlag{
Name: "flag-spec-yaml",
Aliases: []string{"f"},
Value: filepath.Join(top, "flag-spec.yaml"),
},
&cli.PathFlag{
Name: "generated-output",
Aliases: []string{"o"},
Value: filepath.Join(top, "zz_generated.flags.go"),
},
&cli.PathFlag{
Name: "generated-test-output",
Aliases: []string{"t"},
Value: filepath.Join(top, "zz_generated.flags_test.go"),
},
&cli.StringFlag{
Name: "generated-package-name",
Aliases: []string{"p"},
Value: defaultPackageName,
},
&cli.StringFlag{
Name: "generated-test-package-name",
Aliases: []string{"T"},
Value: defaultPackageName + "_test",
},
&cli.StringFlag{
Name: "urfave-cli-namespace",
Aliases: []string{"n"},
Value: "",
},
&cli.StringFlag{
Name: "urfave-cli-test-namespace",
Aliases: []string{"N"},
Value: "cli.",
},
},
Action: runGenFlags,
}
if err := app.RunContext(ctx, os.Args); err != nil {
log.Fatal(err)
}
}
func runGenFlags(cCtx *cli.Context) error {
specBytes, err := os.ReadFile(cCtx.Path("flag-spec-yaml"))
if err != nil {
return err
}
spec := &Spec{}
if err := yaml.Unmarshal(specBytes, spec); err != nil {
return err
}
if cCtx.IsSet("generated-package-name") {
spec.PackageName = strings.TrimSpace(cCtx.String("generated-package-name"))
}
if strings.TrimSpace(spec.PackageName) == "" {
spec.PackageName = defaultPackageName
}
if cCtx.IsSet("generated-test-package-name") {
spec.TestPackageName = strings.TrimSpace(cCtx.String("generated-test-package-name"))
}
if strings.TrimSpace(spec.TestPackageName) == "" {
spec.TestPackageName = defaultPackageName + "_test"
}
if cCtx.IsSet("urfave-cli-namespace") {
spec.UrfaveCLINamespace = strings.TrimSpace(cCtx.String("urfave-cli-namespace"))
}
if cCtx.IsSet("urfave-cli-test-namespace") {
spec.UrfaveCLITestNamespace = strings.TrimSpace(cCtx.String("urfave-cli-test-namespace"))
} else {
spec.UrfaveCLITestNamespace = "cli."
}
genTmpl, err := template.New("gen").Parse(TemplateString)
if err != nil {
return err
}
genTestTmpl, err := template.New("gen_test").Parse(TestTemplateString)
if err != nil {
return err
}
genBuf := &bytes.Buffer{}
if err := genTmpl.Execute(genBuf, spec); err != nil {
return err
}
genTestBuf := &bytes.Buffer{}
if err := genTestTmpl.Execute(genTestBuf, spec); err != nil {
return err
}
if err := os.WriteFile(cCtx.Path("generated-output"), genBuf.Bytes(), 0644); err != nil {
return err
}
if err := os.WriteFile(cCtx.Path("generated-test-output"), genTestBuf.Bytes(), 0644); err != nil {
return err
}
if _, err := sh(cCtx.Context, "goimports", "-w", cCtx.Path("generated-output")); err != nil {
return err
}
if _, err := sh(cCtx.Context, "goimports", "-w", cCtx.Path("generated-test-output")); err != nil {
return err
}
return nil
}
func TypeName(goType string, fc *FlagTypeConfig) string {
if fc != nil && strings.TrimSpace(fc.TypeName) != "" {
return strings.TrimSpace(fc.TypeName)
}
dotSplit := strings.Split(goType, ".")
goType = dotSplit[len(dotSplit)-1]
if strings.HasPrefix(goType, "[]") {
return titler.String(strings.TrimPrefix(goType, "[]")) + "SliceFlag"
}
return titler.String(goType) + "Flag"
}
type Spec struct {
FlagTypes map[string]*FlagTypeConfig `yaml:"flag_types"`
PackageName string `yaml:"package_name"`
TestPackageName string `yaml:"test_package_name"`
UrfaveCLINamespace string `yaml:"urfave_cli_namespace"`
UrfaveCLITestNamespace string `yaml:"urfave_cli_test_namespace"`
}
func (gfs *Spec) SortedFlagTypes() []*FlagType {
typeNames := []string{}
for name := range gfs.FlagTypes {
if strings.HasPrefix(name, "[]") {
name = strings.TrimPrefix(name, "[]") + "Slice"
}
typeNames = append(typeNames, name)
}
sort.Strings(typeNames)
ret := make([]*FlagType, len(typeNames))
for i, typeName := range typeNames {
ret[i] = &FlagType{
GoType: typeName,
Config: gfs.FlagTypes[typeName],
}
}
return ret
}
type FlagTypeConfig struct {
SkipInterfaces []string `yaml:"skip_interfaces"`
StructFields []*FlagStructField `yaml:"struct_fields"`
TypeName string `yaml:"type_name"`
ValuePointer bool `yaml:"value_pointer"`
}
type FlagStructField struct {
Name string
Type string
Pointer bool
}
type FlagType struct {
GoType string
Config *FlagTypeConfig
}
func (ft *FlagType) StructFields() []*FlagStructField {
if ft.Config == nil || ft.Config.StructFields == nil {
return []*FlagStructField{}
}
return ft.Config.StructFields
}
func (ft *FlagType) ValuePointer() bool {
if ft.Config == nil {
return false
}
return ft.Config.ValuePointer
}
func (ft *FlagType) TypeName() string {
return TypeName(ft.GoType, ft.Config)
}
func (ft *FlagType) GenerateFmtStringerInterface() bool {
return ft.skipInterfaceNamed("fmt.Stringer")
}
func (ft *FlagType) GenerateFlagInterface() bool {
return ft.skipInterfaceNamed("Flag")
}
func (ft *FlagType) GenerateRequiredFlagInterface() bool {
return ft.skipInterfaceNamed("RequiredFlag")
}
func (ft *FlagType) GenerateVisibleFlagInterface() bool {
return ft.skipInterfaceNamed("VisibleFlag")
}
func (ft *FlagType) skipInterfaceNamed(name string) bool {
if ft.Config == nil {
return true
}
lowName := strings.ToLower(name)
for _, interfaceName := range ft.Config.SkipInterfaces {
if strings.ToLower(interfaceName) == lowName {
return false
}
}
return true
}