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/* {{{ Copyright (c) Paul R. Tagliamonte <paultag@gmail.com>, 2015
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE. }}} */
package config
import (
"flag"
"fmt"
"os"
"os/user"
"path"
"reflect"
"strings"
"unsafe"
"pault.ag/go/debian/control"
)
func LoadFlags(name string, data interface{}) (*flag.FlagSet, error) {
if err := Load(name, data); err != nil {
return nil, err
}
return Flag(data)
}
//
func Load(name string, data interface{}) error {
localUser, err := user.Current()
if err != nil {
return nil
}
rcPath := path.Join(localUser.HomeDir, fmt.Sprintf(".%src", name))
fd, err := os.Open(rcPath)
if err != nil {
return nil
}
defer fd.Close()
err = control.Unmarshal(data, fd)
return err
}
func flagPointer(incoming reflect.Value, data *flag.FlagSet) error {
if incoming.Type().Kind() == reflect.Ptr {
return flagPointer(incoming.Elem(), data)
}
for i := 0; i < incoming.NumField(); i++ {
field := incoming.Field(i)
fieldType := incoming.Type().Field(i)
if it := fieldType.Tag.Get("flag"); it != "" {
/* Register the flag */
switch field.Type().Kind() {
case reflect.Int:
data.IntVar(
(*int)(unsafe.Pointer(field.Addr().Pointer())),
it,
int(field.Int()),
fieldType.Tag.Get("description"),
)
continue
case reflect.String:
data.StringVar(
(*string)(unsafe.Pointer(field.Addr().Pointer())),
it,
field.String(),
fieldType.Tag.Get("description"),
)
continue
default:
return fmt.Errorf("Unknown type: %s", field.Type().Kind())
}
}
}
return nil
}
func Flag(data interface{}) (*flag.FlagSet, error) {
dataValue := reflect.ValueOf(data)
name := strings.ToLower(dataValue.Elem().Type().Name())
flagSet := flag.NewFlagSet(name, flag.ExitOnError)
flagSet.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage of %s:\n", name)
flagSet.PrintDefaults()
}
err := flagPointer(dataValue, flagSet)
if err != nil {
return nil, err
}
return flagSet, nil
}
// vim: foldmethod=marker
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