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package goptions
import (
"fmt"
"os"
"reflect"
"strconv"
"strings"
)
type optionFunc func(f *Flag, option, value string) error
type optionMap map[string]optionFunc
var (
typeOptionMap = map[reflect.Type]optionMap{
// Global options
nil: optionMap{
"description": description,
"obligatory": obligatory,
"mutexgroup": mutexgroup,
},
reflect.TypeOf(new(*os.File)).Elem(): optionMap{
"create": initOptionMeta(file_create, "file_mode", 0),
"append": initOptionMeta(file_append, "file_mode", 0),
"rdonly": initOptionMeta(file_rdonly, "file_mode", 0),
"wronly": initOptionMeta(file_wronly, "file_mode", 0),
"rdwr": initOptionMeta(file_rdwr, "file_mode", 0),
"excl": initOptionMeta(file_excl, "file_mode", 0),
"sync": initOptionMeta(file_sync, "file_mode", 0),
"trunc": initOptionMeta(file_trunc, "file_mode", 0),
"perm": file_perm,
},
}
)
// Wraps another optionFunc and inits optionMeta[field] with value if it does
// not have one already.
func initOptionMeta(fn optionFunc, field string, init_value interface{}) optionFunc {
return func(f *Flag, option, value string) error {
if _, ok := f.optionMeta[field]; !ok {
f.optionMeta[field] = init_value
}
return fn(f, option, value)
}
}
func description(f *Flag, option, value string) error {
f.Description = strings.Replace(value, `\`, ``, -1)
return nil
}
func obligatory(f *Flag, option, value string) error {
f.Obligatory = true
return nil
}
func mutexgroup(f *Flag, option, value string) error {
if len(value) <= 0 {
return fmt.Errorf("Mutexgroup option needs a value")
}
for _, group := range strings.Split(value, ",") {
f.MutexGroups = append(f.MutexGroups, group)
}
return nil
}
func file_create(f *Flag, option, value string) error {
f.optionMeta["file_mode"] = f.optionMeta["file_mode"].(int) | os.O_CREATE
return nil
}
func file_append(f *Flag, option, value string) error {
f.optionMeta["file_mode"] = f.optionMeta["file_mode"].(int) | os.O_APPEND
return nil
}
func file_rdonly(f *Flag, option, value string) error {
f.optionMeta["file_mode"] = f.optionMeta["file_mode"].(int) | os.O_RDONLY
return nil
}
func file_wronly(f *Flag, option, value string) error {
f.optionMeta["file_mode"] = f.optionMeta["file_mode"].(int) | os.O_WRONLY
return nil
}
func file_rdwr(f *Flag, option, value string) error {
f.optionMeta["file_mode"] = f.optionMeta["file_mode"].(int) | os.O_RDWR
return nil
}
func file_excl(f *Flag, option, value string) error {
f.optionMeta["file_mode"] = f.optionMeta["file_mode"].(int) | os.O_EXCL
return nil
}
func file_sync(f *Flag, option, value string) error {
f.optionMeta["file_mode"] = f.optionMeta["file_mode"].(int) | os.O_SYNC
return nil
}
func file_trunc(f *Flag, option, value string) error {
f.optionMeta["file_mode"] = f.optionMeta["file_mode"].(int) | os.O_TRUNC
return nil
}
func file_perm(f *Flag, option, value string) error {
perm, err := strconv.ParseInt(value, 8, 32)
if err != nil {
return err
}
f.optionMeta["file_perm"] = uint32(perm)
return nil
}
func optionMapForType(t reflect.Type) optionMap {
g := typeOptionMap[nil]
m, _ := typeOptionMap[t]
r := make(optionMap)
for k, v := range g {
r[k] = v
}
for k, v := range m {
r[k] = v
}
return r
}
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