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dex/cmd/genconfig/main.go
2015-08-18 11:26:57 -07:00

109 lines
2.4 KiB
Go

// genconfig generates boilerplate configuration/registration code.
package main
import (
"flag"
"fmt"
"io/ioutil"
"log"
"os"
"strings"
)
var (
output = flag.String("o", "", "output file. Must be set")
)
const tmpl = `// DO NOT EDIT: This file was auto-generated by "go generate"
// To regenerate run:
// go install github.com/coreos/dex/cmd/genconfig
// go generate <<fully qualified package name>>
package __PKG__
import (
"encoding/json"
"errors"
"fmt"
)
type New__OBJ__ConfigFunc func() __OBJ__Config
var (
__obj__Types map[string]New__OBJ__ConfigFunc
)
func Register__OBJ__ConfigType(__obj__Type string, fn New__OBJ__ConfigFunc) {
if __obj__Types == nil {
__obj__Types = make(map[string]New__OBJ__ConfigFunc)
}
if _, ok := __obj__Types[__obj__Type]; ok {
panic(fmt.Sprintf("__obj__ config type %q already registered", __obj__Type))
}
__obj__Types[__obj__Type] = fn
}
func New__OBJ__ConfigFromType(__obj__Type string) (__OBJ__Config, error) {
fn, ok := __obj__Types[__obj__Type]
if !ok {
return nil, fmt.Errorf("unrecognized __obj__ config type %q", __obj__Type)
}
return fn(), nil
}
func new__OBJ__ConfigFromMap(m map[string]interface{}) (__OBJ__Config, error) {
ityp, ok := m["type"]
if !ok {
return nil, errors.New("__obj__ config type not set")
}
typ, ok := ityp.(string)
if !ok {
return nil, errors.New("__obj__ config type not string")
}
cfg, err := New__OBJ__ConfigFromType(typ)
if err != nil {
return nil, err
}
b, err := json.Marshal(m)
if err != nil {
return nil, err
}
if err = json.Unmarshal(b, cfg); err != nil {
return nil, err
}
return cfg, nil
}
`
// Usage is a replacement usage function for the flags package.
func Usage() {
fmt.Fprintf(os.Stderr, "Usage of %s:\n", os.Args[0])
fmt.Fprintf(os.Stderr, "\tgenconfig -o OutputFile PackageName ObjToConfigure \n")
fmt.Fprintf(os.Stderr, "Flags:\n")
flag.PrintDefaults()
}
func main() {
flag.Parse()
flag.Usage = Usage
args := flag.Args()
if *output == "" || len(args) != 2 {
flag.Usage()
os.Exit(2)
}
pkg := args[0]
objType := args[1]
objTypeLower := strings.ToLower(objType[0:1]) + objType[1:]
src := strings.Replace(tmpl, "__OBJ__", objType, -1)
src = strings.Replace(src, "__obj__", objTypeLower, -1)
src = strings.Replace(src, "__PKG__", pkg, -1)
err := ioutil.WriteFile(*output, []byte(src), 0644)
if err != nil {
log.Fatalf("writing output: %s", err)
}
}