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tag.go
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tag.go
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package structflags
import (
"fmt"
"html"
"log"
"reflect"
"strings"
"time"
"github.com/urfave/cli/v2"
)
type ParsedTag struct {
Name string
Usage string
Aliases []string
Opts map[string]struct{}
}
func Parse(tag reflect.StructTag, parent *ParsedTag) *ParsedTag {
tagstr, ok := tag.Lookup("flags")
if !ok {
return nil
}
parsed := &ParsedTag{}
ss := strings.Split(tagstr, ",")
if len(ss) > 0 {
parsed.Name = ss[0]
if parent != nil && parent.Name != "" {
parsed.Name = fmt.Sprintf("%s.%s", parent.Name, parsed.Name)
}
}
if len(ss) > 1 {
parsed.Usage = html.UnescapeString(ss[1])
}
if len(ss) > 2 {
aliases := strings.Split(ss[2], ";")
for _, e := range aliases {
if e == "" {
continue
}
parsed.Aliases = append(parsed.Aliases, e)
}
}
if len(ss) > 3 {
parsed.Opts = make(map[string]struct{})
for _, e := range ss[3:] {
parsed.Opts[e] = struct{}{}
}
}
return parsed
}
var DurationType = reflect.TypeOf(time.Duration(0))
func (parsed *ParsedTag) ToCliFlag(v reflect.Value) cli.Flag {
_, required := parsed.Opts["required"]
_, hidden := parsed.Opts["hidden"]
if _, ok := parsed.Opts["duration"]; ok {
return &cli.DurationFlag{
Name: parsed.Name,
Usage: parsed.Usage,
Aliases: parsed.Aliases,
Required: required,
Hidden: hidden,
// FIXME: default value
}
}
var defaultValue string
stringLike := false
if v.Kind() == reflect.String {
stringLike = true
defaultValue = v.String()
} else if v.Type().Implements(UnmarshalerType) {
stringLike = true
defaultValue = "" // FIXME
} else if v.CanAddr() && v.Addr().Type().Implements(UnmarshalerType) {
stringLike = true
defaultValue = "" // FIXME
}
if stringLike {
if _, ok := parsed.Opts["path"]; ok {
return &cli.PathFlag{
Name: parsed.Name,
Usage: parsed.Usage,
Aliases: parsed.Aliases,
Required: required,
Hidden: hidden,
Value: defaultValue,
DefaultText: defaultValue,
}
} else {
return &cli.StringFlag{
Name: parsed.Name,
Usage: parsed.Usage,
Aliases: parsed.Aliases,
Required: required,
Hidden: hidden,
Value: defaultValue,
DefaultText: defaultValue,
}
}
}
switch v.Kind() {
case reflect.Bool:
return &cli.BoolFlag{
Name: parsed.Name,
Usage: parsed.Usage,
Aliases: parsed.Aliases,
Required: required,
Hidden: hidden,
Value: v.Bool(),
}
case reflect.Int:
return &cli.IntFlag{
Name: parsed.Name,
Usage: parsed.Usage,
Aliases: parsed.Aliases,
Required: required,
Hidden: hidden,
Value: int(v.Int()),
}
default:
log.Panicf("ToCliFlag: unknown kind %v", v.Kind())
return nil
}
}