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generator.go
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generator.go
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package entkit
import (
"bytes"
"entgo.io/contrib/entgql"
"entgo.io/ent/entc/gen"
"fmt"
"io/fs"
"os"
"os/exec"
"path"
"path/filepath"
"strings"
"text/template"
)
// Generator main struct
type Generator struct {
Name *string `json:"Name,omitempty"`
Extension *Extension `json:"Extension,omitempty"`
SkipGoModTidy *bool `json:"SkipGoModTidy,omitempty"`
Adapter GeneratorAdapter
Path *string `json:"Path,omitempty"`
Enabled *bool `json:"Enabled,omitempty"`
Serve *bool `json:"Serve,omitempty"`
Graph *gen.Graph
SkipModes SkipModes
Ops []gen.Op
CWD *string `json:"CWD,omitempty"` // base directory of gen.go file or running `go generate` command CWD
RelCWD *string `json:"RelCWD"` // relative directory of CWD and current generator path
}
type SkipModes struct {
SkipAll int
SkipEnumField entgql.SkipMode
SkipMutationCreateInput entgql.SkipMode
SkipMutationUpdateInput entgql.SkipMode
SkipOrderField entgql.SkipMode
SkipWhereInput entgql.SkipMode
}
// Cast converts int to entgql.SkipMode
func (sm *SkipModes) Cast(value int) entgql.SkipMode {
return entgql.SkipMode(value)
}
// GeneratorAdapter interface
type GeneratorAdapter interface {
GetName() string
}
// GeneratorAdapterWithDependencies interface
type GeneratorAdapterWithDependencies interface {
GetDependencies() []GeneratorAdapter
}
// GeneratorAdapterWithFS interface
type GeneratorAdapterWithFS interface {
GetFS() fs.FS
}
// GeneratorAdapterWithAfterCommand interface
type GeneratorAdapterWithAfterCommand interface {
CommandAfterGen(generator *Generator) string
}
// GeneratorAdapterWithBeforeCommand interface
type GeneratorAdapterWithBeforeCommand interface {
CommandBeforeGen(generator *Generator) string
}
// GeneratorAdapterWithBefore interface
type GeneratorAdapterWithBefore interface {
BeforeGen(generator *Generator) error
}
// GeneratorAdapterWithAfter interface
type GeneratorAdapterWithAfter interface {
AfterGen(generator *Generator) error
}
// GeneratorAdapterWithTemplates interface
type GeneratorAdapterWithTemplates interface {
GeneratorAdapterWithFS
GetTemplates() []string
}
// GeneratorAdapterWithStaticTemplates interface
type GeneratorAdapterWithStaticTemplates interface {
GeneratorAdapterWithFS
GetStaticTemplates() []string
}
// parseTemplate parses template from adapter FS
func (gr *Generator) parseTemplate(path string, adapter GeneratorAdapterWithFS) *gen.Template {
t := gen.NewTemplate(path).Funcs(gr.Extension.funcMap)
var _funcMap template.FuncMap = map[string]interface{}{}
// copied from: https://github.com/helm/helm/blob/8648ccf5d35d682dcd5f7a9c2082f0aaf071e817/pkg/engine/engine.go#L147-L154
_funcMap["include"] = func(name string, data interface{}) (string, error) {
buf := bytes.NewBuffer(nil)
if err := t.ExecuteTemplate(buf, name, data); err != nil {
return "", err
}
return buf.String(), nil
}
return gen.MustParse(t.Funcs(_funcMap).ParseFS(adapter.GetFS(), path))
}
func (gr *Generator) ServableAdapter() ServableAdapter {
sa, ok := (gr.Adapter).(ServableAdapter)
if ok {
return sa
}
panic("provided Adapter is not a ServableAdapter")
}
// Generate generates code from adapter
func (gr *Generator) Generate(graph *gen.Graph) {
gr.Graph = graph
gr.runBeforeGenCommands()
gr.runBeforeGen()
adapterWithDependencies, ok := gr.Adapter.(GeneratorAdapterWithDependencies)
if ok {
deps := adapterWithDependencies.GetDependencies()
for _, depAdapter := range deps {
gr.generateAdapterOutput(depAdapter, graph)
}
}
gr.generateAdapterOutput(gr.Adapter, graph)
if !PBool(gr.SkipGoModTidy) {
gr.runCMD("go mod tidy -e")
}
gr.runAfterGenCommand()
gr.runAfterGen()
}
// generateAdapterOutput generates code from adapter
func (gr *Generator) generateAdapterOutput(adapter GeneratorAdapter, graph *gen.Graph) {
adapterWithFS, ok := adapter.(GeneratorAdapterWithFS)
if !ok {
panic("unable to parse template from adapter that not implements FS")
}
genWithTemplates, ok := (adapter).(GeneratorAdapterWithTemplates)
if ok {
for _, t := range genWithTemplates.GetTemplates() {
_t := gr.parseTemplate(t, adapterWithFS)
gr.rendAndSave(_t, true)
}
}
genWithStaticTemplates, ok := (adapter).(GeneratorAdapterWithStaticTemplates)
if ok {
for _, t := range genWithStaticTemplates.GetStaticTemplates() {
_t := gr.parseTemplate(t, adapterWithFS)
gr.rendAndSave(_t, false)
}
}
}
func (gr *Generator) runAfterGen() {
adapter, ok := (gr.Adapter).(GeneratorAdapterWithAfter)
if !ok {
return
}
err := adapter.AfterGen(gr)
if err != nil {
panic(err)
}
}
func (gr *Generator) runBeforeGen() {
adapter, ok := (gr.Adapter).(GeneratorAdapterWithBefore)
if !ok {
return
}
err := adapter.BeforeGen(gr)
if err != nil {
panic(err)
}
}
func (gr *Generator) runCMD(command string) {
cmd := exec.Command("/bin/sh", "-c", command)
cmd.Dir = PString(gr.Path)
out, err := cmd.Output()
if err != nil {
fmt.Println("Command", cmd, string(out), err.Error())
}
}
func (gr *Generator) runAfterGenCommand() {
adapterWithAfterGenCommand, ok := (gr.Adapter).(GeneratorAdapterWithAfterCommand)
if !ok {
return
}
gr.runCMD(adapterWithAfterGenCommand.CommandAfterGen(gr))
}
func (gr *Generator) runBeforeGenCommands() {
adapterWithBeforeGenCommand, ok := (gr.Adapter).(GeneratorAdapterWithBeforeCommand)
if !ok {
return
}
gr.runCMD(adapterWithBeforeGenCommand.CommandBeforeGen(gr))
}
func (gr *Generator) rendAndSave(tmpl *gen.Template, override bool) {
rootName := path.Base(tmpl.Name())
for _, t := range tmpl.Templates() {
var b bytes.Buffer
if t.Name() == rootName {
continue
}
if strings.HasPrefix(t.Name(), "partial:") {
continue
}
t = t.Funcs(gr.Extension.funcMap)
err := tmpl.ExecuteTemplate(&b, t.Name(), gr)
if err != nil {
panic(err)
}
err = gr.saveGenerated(t.Name(), b, override)
if err != nil {
panic(err)
}
}
}
func (gr *Generator) exists(name string) bool {
_, err := os.Stat(name)
return !os.IsNotExist(err)
}
func (gr *Generator) saveFile(path string, content []byte, override bool) error {
if override {
_ = os.Remove(path)
} else if gr.exists(path) {
return nil
}
f, err := os.Create(path)
if err != nil {
return err
}
defer f.Close()
_, err = f.Write(content)
return err
}
func (gr *Generator) saveGenerated(name string, content bytes.Buffer, override bool) error {
resDir := PString(gr.Path)
p := filepath.Join(resDir, name)
err := os.MkdirAll(filepath.Dir(p), os.ModePerm)
if err != nil {
panic(err)
}
return gr.saveFile(p, content.Bytes(), override)
}
type GeneratorOption = func(*Generator) error
func TargetPath(path string) GeneratorOption {
return func(gen *Generator) (err error) {
gen.Path = StringP(path)
return nil
}
}
func SkipGoModTidy() GeneratorOption {
return func(gen *Generator) (err error) {
gen.SkipGoModTidy = BoolP(true)
return nil
}
}
func GeneratorHook(ex *Extension) gen.Hook {
return func(next gen.Generator) gen.Generator {
return gen.GenerateFunc(func(g *gen.Graph) error {
// Run ent codegen first to ensure working against an updated schema.
if err := next.Generate(g); err != nil {
return err
}
var tracked = false
if PBool(ex.IgnoreUncommittedChanges) {
tracked = true
} else {
cmd := exec.Command("git", "update-index", "--refresh")
_ = cmd.Run()
cmd = exec.Command("git", "diff-index", "--quiet", "HEAD", "--")
err := cmd.Run()
if exitError, ok := err.(*exec.ExitError); ok {
if exitError.ExitCode() > 0 {
fmt.Println("entkit: skipped: \"It seems you have uncommitted changes. Please commit them before proceeding with code generation.\"")
}
} else {
tracked = true
}
}
if tracked {
for _, generator := range ex.Generators {
generator.Generate(g)
}
}
return nil
})
}
}
func NewGenerator(extension *Extension, name string, adapter GeneratorAdapter, options ...GeneratorOption) *Generator {
var err error
g := &Generator{
Name: StringP(name),
Extension: extension,
Adapter: adapter,
SkipModes: SkipModes{
SkipEnumField: entgql.SkipEnumField,
SkipMutationCreateInput: entgql.SkipMutationCreateInput,
SkipMutationUpdateInput: entgql.SkipMutationUpdateInput,
SkipOrderField: entgql.SkipOrderField,
SkipWhereInput: entgql.SkipWhereInput,
},
Ops: []gen.Op{
gen.EQ,
gen.NEQ,
gen.GT,
gen.GTE,
gen.LT,
gen.LTE,
gen.IsNil,
gen.NotNil,
gen.In,
gen.NotIn,
gen.EqualFold,
gen.Contains,
gen.ContainsFold,
gen.HasPrefix,
gen.HasSuffix,
},
}
cwd, err := os.Getwd()
if err != nil {
panic(err)
}
g.CWD = &cwd
for _, opt := range options {
if err := opt(g); err != nil {
panic(err)
}
}
_, ok := (g.Adapter).(ServableAdapter)
if ok {
if g.Serve == nil {
g.Serve = BoolP(true)
}
}
if g.Path == nil {
g.Path = StringP("./" + name)
}
absPath, err := filepath.Abs(*g.Path)
if err != nil {
panic(err)
}
relCWD, err := filepath.Rel(absPath, *g.CWD)
if err != nil {
panic(err)
}
g.RelCWD = &relCWD
return g
}
func (gr *Generator) DefaultActions() []*Action {
return DefaultActions
}