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generator.go
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generator.go
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package gencontroller
import (
"flag"
"fmt"
"os"
"path/filepath"
"strings"
"unicode"
"github.com/goadesign/goa/design"
"github.com/goadesign/goa/goagen/codegen"
"github.com/goadesign/goa/goagen/gen_main"
"github.com/goadesign/goa/goagen/utils"
)
//NewGenerator returns an initialized instance of a JavaScript Client Generator
func NewGenerator(options ...Option) *Generator {
g := &Generator{}
for _, option := range options {
option(g)
}
return g
}
// Generator is the application code generator.
type Generator struct {
API *design.APIDefinition // The API definition
OutDir string // Path to output directory
DesignPkg string // Path to design package, only used to mark generated files.
AppPkg string // Name of generated "app" package
Force bool // Whether to override existing files
Regen bool // Whether to regenerate scaffolding in place, retaining controller impls
Pkg string // Name of the generated package
Resource string // Name of the generated file
genfiles []string // Generated files
}
// Generate is the generator entry point called by the meta generator.
func Generate() (files []string, err error) {
var (
outDir, designPkg, appPkg, ver, res, pkg string
force, regen bool
)
set := flag.NewFlagSet("controller", flag.PanicOnError)
set.StringVar(&outDir, "out", "", "")
set.StringVar(&designPkg, "design", "", "")
set.StringVar(&appPkg, "app-pkg", "app", "")
set.StringVar(&pkg, "pkg", "main", "")
set.StringVar(&res, "res", "", "")
set.StringVar(&ver, "version", "", "")
set.BoolVar(&force, "force", false, "")
set.BoolVar(®en, "regen", false, "")
set.Bool("notest", false, "")
set.Parse(os.Args[1:])
if err := codegen.CheckVersion(ver); err != nil {
return nil, err
}
g := &Generator{OutDir: outDir, DesignPkg: designPkg, AppPkg: appPkg, Force: force, Regen: regen, API: design.Design, Pkg: pkg, Resource: res}
return g.Generate()
}
// Generate produces the skeleton controller service factory.
func (g *Generator) Generate() (_ []string, err error) {
if g.API == nil {
return nil, fmt.Errorf("missing API definition, make sure design is properly initialized")
}
go utils.Catch(nil, func() { g.Cleanup() })
defer func() {
if err != nil {
g.Cleanup()
}
}()
if g.AppPkg == "" {
g.AppPkg = "app"
}
g.smartenPkg()
elems := strings.Split(g.AppPkg, "/")
pkgName := elems[len(elems)-1]
codegen.Reserved[pkgName] = true
err = g.API.IterateResources(func(r *design.ResourceDefinition) error {
var (
filename string
err error
)
if g.Resource == "" || g.Resource == r.Name {
filename, err = genmain.GenerateController(g.Force, g.Regen, g.AppPkg, g.OutDir, g.Pkg, r.Name, r)
}
if err != nil {
return err
}
g.genfiles = append(g.genfiles, filename)
return nil
})
if err != nil {
return nil, err
}
return g.genfiles, err
}
func (g *Generator) smartenPkg() {
if g.Pkg != "main" {
return
}
pwd, err := os.Getwd()
if err != nil {
return
}
if g.OutDir == pwd {
return
}
pkg := filepath.Base(g.OutDir)
if pkg == "" {
return
}
for _, r := range pkg {
if unicode.IsLetter(r) != true {
return
}
g.Pkg = pkg
break
}
}
// Cleanup removes all the files generated by this generator during the last invokation of Generate.
func (g *Generator) Cleanup() {
for _, f := range g.genfiles {
os.Remove(f)
}
g.genfiles = nil
}