/
main.go
215 lines (197 loc) · 5.01 KB
/
main.go
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package main
import (
"bytes"
"errors"
"fmt"
"go/ast"
"go/format"
"go/parser"
"go/token"
"io"
"os"
"path/filepath"
"reflect"
"runtime"
"strings"
"github.com/naoina/kocha"
"github.com/naoina/kocha/util"
)
var (
routeTableTypeName = reflect.TypeOf(kocha.RouteTable{}).Name()
)
type generateControllerCommand struct {
option struct {
Help bool `short:"h" long:"help"`
}
}
func (c *generateControllerCommand) Name() string {
return "kocha generate controller"
}
func (c *generateControllerCommand) Usage() string {
return fmt.Sprintf(`Usage: %s [OPTIONS] NAME
Generate the skeleton files of controller.
Options:
-h, --help display this help and exit
`, c.Name())
}
func (c *generateControllerCommand) Option() interface{} {
return &c.option
}
// Run generates the controller templates.
func (c *generateControllerCommand) Run(args []string) error {
if len(args) < 1 || args[0] == "" {
return fmt.Errorf("no NAME given")
}
name := args[0]
camelCaseName := util.ToCamelCase(name)
snakeCaseName := util.ToSnakeCase(name)
receiverName := strings.ToLower(name)
if len(receiverName) > 1 {
receiverName = receiverName[:2]
} else {
receiverName = receiverName[:1]
}
data := map[string]interface{}{
"Name": camelCaseName,
"Receiver": receiverName,
}
if err := util.CopyTemplate(
filepath.Join(skeletonDir("controller"), "controller.go"+util.TemplateSuffix),
filepath.Join("app", "controller", snakeCaseName+".go"), data); err != nil {
return err
}
if err := util.CopyTemplate(
filepath.Join(skeletonDir("controller"), "view.html"+util.TemplateSuffix),
filepath.Join("app", "view", snakeCaseName+".html"), data); err != nil {
return err
}
return addRouteToFile(name)
}
func addRouteToFile(name string) error {
routeFilePath := filepath.Join("config", "routes.go")
fset := token.NewFileSet()
f, err := parser.ParseFile(fset, routeFilePath, nil, 0)
if err != nil {
return fmt.Errorf("failed to read file: %v", err)
}
routeStructName := util.ToCamelCase(name)
routeName := util.ToSnakeCase(name)
routeTableAST, err := findRouteTableAST(f)
if err != nil {
return err
}
if routeTableAST == nil {
return nil
}
routeASTs := findRouteASTs(routeTableAST)
if routeASTs == nil {
return nil
}
if isRouteDefined(routeASTs, routeStructName) {
return nil
}
routeFile, err := os.OpenFile(routeFilePath, os.O_RDWR, 0644)
if err != nil {
return fmt.Errorf("failed to open file: %v", err)
}
defer routeFile.Close()
lastRouteAST := routeASTs[len(routeASTs)-1]
offset := int64(fset.Position(lastRouteAST.End()).Offset)
var buf bytes.Buffer
if _, err := io.CopyN(&buf, routeFile, offset); err != nil {
return fmt.Errorf("failed to read file: %v", err)
}
buf.WriteString(fmt.Sprintf(`, {
Name: "%s",
Path: "/%s",
Controller: &controller.%s{},
}`, routeName, routeName, routeStructName))
if _, err := io.Copy(&buf, routeFile); err != nil {
return fmt.Errorf("failed to read file: %v", err)
}
formatted, err := format.Source(buf.Bytes())
if err != nil {
return fmt.Errorf("failed to format file: %v", err)
}
if _, err := routeFile.WriteAt(formatted, 0); err != nil {
return fmt.Errorf("failed to update file: %v", err)
}
return nil
}
var ErrRouteTableASTIsFound = errors.New("route table AST is found")
func findRouteTableAST(file *ast.File) (routeTableAST *ast.CompositeLit, err error) {
defer func() {
if e := recover(); e != nil && e != ErrRouteTableASTIsFound {
err = e.(error)
}
}()
ast.Inspect(file, func(node ast.Node) bool {
switch aType := node.(type) {
case *ast.GenDecl:
if aType.Tok != token.VAR {
return false
}
ast.Inspect(aType, func(n ast.Node) bool {
switch typ := n.(type) {
case *ast.CompositeLit:
switch t := typ.Type.(type) {
case *ast.Ident:
if t.Name == routeTableTypeName {
routeTableAST = typ
panic(ErrRouteTableASTIsFound)
}
}
}
return true
})
}
return true
})
return routeTableAST, nil
}
func findRouteASTs(clit *ast.CompositeLit) []*ast.CompositeLit {
var routeASTs []*ast.CompositeLit
for _, c := range clit.Elts {
if a, ok := c.(*ast.CompositeLit); ok {
routeASTs = append(routeASTs, a)
}
}
return routeASTs
}
func isRouteDefined(routeASTs []*ast.CompositeLit, routeStructName string) bool {
for _, a := range routeASTs {
for _, elt := range a.Elts {
kv, ok := elt.(*ast.KeyValueExpr)
if !ok {
continue
}
if kv.Key.(*ast.Ident).Name != "Controller" {
continue
}
unary, ok := kv.Value.(*ast.UnaryExpr)
if !ok {
continue
}
lit, ok := unary.X.(*ast.CompositeLit)
if !ok {
continue
}
selector, ok := lit.Type.(*ast.SelectorExpr)
if !ok {
continue
}
if selector.X.(*ast.Ident).Name == "controller" && selector.Sel.Name == routeStructName {
return true
}
}
}
return false
}
func skeletonDir(name string) string {
_, filename, _, _ := runtime.Caller(0)
baseDir := filepath.Dir(filename)
return filepath.Join(baseDir, "skeleton", name)
}
func main() {
util.RunCommand(&generateControllerCommand{})
}