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