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main.go
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main.go
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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package main
import (
"bytes"
"flag"
"fmt"
"go/ast"
"go/parser"
"go/token"
"log"
"os"
"path/filepath"
"reflect"
"strings"
"text/template"
yaml "gopkg.in/yaml.v3"
"mvdan.cc/gofumpt/format"
)
var tpl = `// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
// Code generated by hack/docgen tool. DO NOT EDIT.
package {{ .Package }}
import (
"github.com/talos-systems/talos/pkg/machinery/config/encoder"
)
{{ $tick := "` + "`" + `" -}}
var (
{{ range $struct := .Structs -}}
{{ $struct.Name }}Doc encoder.Doc
{{ end -}}
)
func init() {
{{ range $struct := .Structs -}}
{{ $docVar := printf "%v%v" $struct.Name "Doc" }}
{{ $docVar }}.Type = "{{ $struct.Name }}"
{{ $docVar }}.Comments[encoder.LineComment] = "{{ $struct.Text.Comment }}"
{{ $docVar }}.Description = "{{ $struct.Text.Description }}"
{{ range $example := $struct.Text.Examples }}
{{ if $example.Value }}
{{ $docVar }}.AddExample("{{ $example.Name }}", {{ $example.Value }})
{{ end -}}
{{ end -}}
{{ if $struct.AppearsIn -}}
{{ $docVar }}.AppearsIn = []encoder.Appearance{
{{ range $value := $struct.AppearsIn -}}
{
TypeName: "{{ $value.Struct.Name }}",
FieldName: "{{ $value.FieldName }}",
},
{{ end -}}
}
{{ end -}}
{{ $docVar }}.Fields = make([]encoder.Doc,{{ len $struct.Fields }})
{{ range $index, $field := $struct.Fields }}{{ if $field.Tag -}}
{{ $docVar }}.Fields[{{ $index }}].Name = "{{ $field.Tag }}"
{{ $docVar }}.Fields[{{ $index }}].Type = "{{ $field.Type }}"
{{ $docVar }}.Fields[{{ $index }}].Note = "{{ $field.Note }}"
{{ $docVar }}.Fields[{{ $index }}].Description = "{{ $field.Text.Description }}"
{{ $docVar }}.Fields[{{ $index }}].Comments[encoder.LineComment] = "{{ $field.Text.Comment }}"
{{ range $example := $field.Text.Examples }}
{{ if $example.Value }}
{{ $docVar }}.Fields[{{ $index }}].AddExample("{{ $example.Name }}", {{ $example.Value }})
{{ end -}}
{{ end -}}
{{ if $field.Text.Values -}}
{{ $docVar }}.Fields[{{ $index }}].Values = []string{
{{ range $value := $field.Text.Values -}}
"{{ $value }}",
{{ end -}}
}
{{ end -}}
{{ end -}}
{{- end }}
{{ end }}
}
{{ range $struct := .Structs -}}
func (_ {{ $struct.Name }}) Doc() *encoder.Doc {
return &{{ $struct.Name }}Doc
}
{{ end -}}
// Get{{ .Name }}Doc returns documentation for the file {{ .File }}.
func Get{{ .Name }}Doc() *encoder.FileDoc {
return &encoder.FileDoc{
Name: "{{ .Name }}",
Description: "{{ .Header }}",
Structs: []*encoder.Doc{
{{ range $struct := .Structs -}}
&{{ $struct.Name }}Doc,
{{ end -}}
},
}
}
`
type Doc struct {
Name string
Package string
Title string
Header string
File string
Structs []*Struct
}
type Struct struct {
Name string
Text *Text
Fields []*Field
AppearsIn []Appearance
}
type Appearance struct {
Struct *Struct
FieldName string
}
type Example struct {
Name string `yaml:"name"`
Value string `yaml:"value"`
}
type Field struct {
Name string
Type string
TypeRef string
Text *Text
Tag string
Note string
}
type Text struct {
Comment string `json:"-"`
Description string `json:"description"`
Examples []*Example `json:"examples"`
Values []string `json:"values"`
}
func in(p string) (string, error) {
return filepath.Abs(p)
}
func out(p string) (*os.File, error) {
abs, err := filepath.Abs(p)
if err != nil {
return nil, err
}
return os.Create(abs)
}
type structType struct {
name string
text *Text
pos token.Pos
node *ast.StructType
}
type aliasType struct {
fieldType string
fieldTypeRef string
}
func collectStructs(node ast.Node) ([]*structType, map[string]aliasType) {
structs := []*structType{}
aliases := map[string]aliasType{}
collectStructs := func(n ast.Node) bool {
g, ok := n.(*ast.GenDecl)
if !ok {
return true
}
isAlias := false
if g.Doc != nil {
for _, comment := range g.Doc.List {
if strings.Contains(comment.Text, "docgen:nodoc") {
return true
}
if strings.Contains(comment.Text, "docgen:alias") {
isAlias = true
}
}
}
for _, spec := range g.Specs {
t, ok := spec.(*ast.TypeSpec)
if !ok {
return true
}
if t.Type == nil {
return true
}
x, ok := t.Type.(*ast.StructType)
if !ok {
if isAlias {
aliases[t.Name.Name] = aliasType{
fieldType: formatFieldType(t.Type),
fieldTypeRef: getFieldType(t.Type),
}
}
return true
}
structName := t.Name.Name
text := &Text{}
if t.Doc != nil {
text = parseComment([]byte(t.Doc.Text()))
} else if g.Doc != nil {
text = parseComment([]byte(g.Doc.Text()))
}
s := &structType{
name: structName,
text: text,
node: x,
pos: x.Pos(),
}
structs = append(structs, s)
}
return true
}
ast.Inspect(node, collectStructs)
return structs, aliases
}
func parseComment(comment []byte) *Text {
text := &Text{}
if err := yaml.Unmarshal(comment, text); err != nil {
lines := strings.Split(string(comment), "\n")
for i := range lines {
lines[i] = strings.TrimLeft(lines[i], "\t")
}
// not yaml, fallback
text.Description = strings.Join(lines, "\n")
// take only the first line from the Description for the comment
text.Comment = lines[0]
// try to parse everything except for the first line as yaml
if err = yaml.Unmarshal([]byte(strings.Join(lines[1:], "\n")), text); err == nil {
// if parsed, remove it from the description
text.Description = text.Comment
}
} else {
text.Description = strings.TrimSpace(text.Description)
// take only the first line from the Description for the comment
text.Comment = strings.Split(text.Description, "\n")[0]
}
text.Comment = escape(text.Comment)
text.Description = escape(text.Description)
for _, example := range text.Examples {
example.Name = escape(example.Name)
example.Value = strings.TrimSpace(example.Value)
}
return text
}
func getFieldType(p interface{}) string {
if m, ok := p.(*ast.MapType); ok {
return getFieldType(m.Value)
}
switch t := p.(type) {
case *ast.Ident:
return t.Name
case *ast.ArrayType:
return getFieldType(p.(*ast.ArrayType).Elt)
case *ast.StarExpr:
return getFieldType(t.X)
case *ast.SelectorExpr:
return getFieldType(t.Sel)
default:
return ""
}
}
func formatFieldType(p interface{}) string {
if m, ok := p.(*ast.MapType); ok {
return fmt.Sprintf("map[%s]%s", formatFieldType(m.Key), formatFieldType(m.Value))
}
switch t := p.(type) {
case *ast.Ident:
return t.Name
case *ast.ArrayType:
return "[]" + formatFieldType(p.(*ast.ArrayType).Elt)
case *ast.StructType:
return "struct"
case *ast.StarExpr:
return formatFieldType(t.X)
case *ast.SelectorExpr:
return formatFieldType(t.Sel)
default:
log.Printf("unknown: %#v", t)
return ""
}
}
func escape(value string) string {
value = strings.ReplaceAll(value, `"`, `\"`)
value = strings.ReplaceAll(value, "\n", `\n`)
return strings.TrimSpace(value)
}
func collectFields(s *structType, aliases map[string]aliasType) (fields []*Field) {
fields = []*Field{}
for _, f := range s.node.Fields.List {
if f.Names == nil {
// This is an embedded struct.
continue
}
name := f.Names[0].Name
if f.Doc == nil {
log.Fatalf("field %q is missing a documentation", name)
}
if strings.Contains(f.Doc.Text(), "docgen:nodoc") {
fields = append(fields, &Field{Type: "unknown"})
continue
}
if f.Tag == nil {
log.Fatalf("field %q is missing a tag", name)
}
fieldType := formatFieldType(f.Type)
if alias, ok := aliases[fieldType]; ok {
fieldType = alias.fieldType
}
fieldTypeRef := getFieldType(f.Type)
if alias, ok := aliases[fieldTypeRef]; ok {
fieldTypeRef = alias.fieldTypeRef
}
tag := reflect.StructTag(strings.Trim(f.Tag.Value, "`"))
yamlTag := tag.Get("yaml")
yamlTag = strings.Split(yamlTag, ",")[0]
if yamlTag == "" {
log.Fatalf("field %q is missing a `yaml` tag or name in it", name)
}
text := parseComment([]byte(f.Doc.Text()))
field := &Field{
Name: name,
Tag: yamlTag,
Type: fieldType,
TypeRef: fieldTypeRef,
Text: text,
}
if f.Comment != nil {
field.Note = escape(f.Comment.Text())
}
fields = append(fields, field)
}
return fields
}
func render(doc *Doc, dest string) {
t := template.Must(template.New("docfile.tpl").Parse(tpl))
buf := bytes.Buffer{}
err := t.Execute(&buf, doc)
if err != nil {
panic(err)
}
formatted, err := format.Source(buf.Bytes(), format.Options{})
if err != nil {
log.Printf("data: %s", buf.Bytes())
panic(err)
}
out, err := out(dest)
if err != nil {
panic(err)
}
defer out.Close()
_, err = out.Write(formatted)
if err != nil {
panic(err)
}
}
func processFile(inputFile, outputFile, typeName string) {
abs, err := in(inputFile)
if err != nil {
log.Fatal(err)
}
fmt.Printf("creating package file set: %q\n", abs)
fset := token.NewFileSet()
node, err := parser.ParseFile(fset, abs, nil, parser.ParseComments)
if err != nil {
log.Fatal(err)
}
packageName := node.Name.Name
tokenFile := fset.File(node.Pos())
if tokenFile == nil {
log.Fatalf("No token")
}
fmt.Printf("parsing file in package %q: %s\n", packageName, tokenFile.Name())
structs, aliases := collectStructs(node)
if len(structs) == 0 {
log.Fatalf("failed to find types that could be documented in %s", abs)
}
doc := &Doc{
Package: packageName,
Structs: []*Struct{},
}
extraExamples := map[string][]*Example{}
backReferences := map[string][]Appearance{}
for _, s := range structs {
fmt.Printf("generating docs for type: %q\n", s.name)
fields := collectFields(s, aliases)
s := &Struct{
Name: s.name,
Text: s.text,
Fields: fields,
}
for _, field := range fields {
if field.TypeRef == "" {
continue
}
if len(field.Text.Examples) > 0 {
extraExamples[field.TypeRef] = append(extraExamples[field.TypeRef], field.Text.Examples...)
}
backReferences[field.TypeRef] = append(backReferences[field.TypeRef], Appearance{
Struct: s,
FieldName: field.Tag,
})
}
doc.Structs = append(doc.Structs, s)
}
for _, s := range doc.Structs {
if extra, ok := extraExamples[s.Name]; ok {
s.Text.Examples = append(s.Text.Examples, extra...)
}
if ref, ok := backReferences[s.Name]; ok {
s.AppearsIn = append(s.AppearsIn, ref...)
}
}
if err == nil {
doc.Package = node.Name.Name
doc.Name = typeName
if node.Doc != nil {
doc.Header = escape(node.Doc.Text())
}
}
doc.File = outputFile
render(doc, outputFile)
}
func main() {
flag.Parse()
if flag.NArg() != 3 {
log.Fatalf("expected 3 args, got %d", flag.NArg())
}
inputFile := flag.Arg(0)
outputFile := flag.Arg(1)
typeName := flag.Arg(2)
processFile(inputFile, outputFile, typeName)
}