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package main
import (
"encoding/json"
"os"
"os/exec"
"strings"
"text/template"
)
const (
tmpl = `package kingpin
// This file is autogenerated by "go generate .". Do not modify.
{{range .}}
{{if not .NoValueParser}}
// -- {{.Type}} Value
type {{.|ValueName}} struct { v *{{.Type}} }
func new{{.|Name}}Value(p *{{.Type}}) *{{.|ValueName}} {
return &{{.|ValueName}}{p}
}
func (f *{{.|ValueName}}) Set(s string) error {
v, err := {{.Parser}}
if err == nil {
*f.v = ({{.Type}})(v)
}
return err
}
func (f *{{.|ValueName}}) Get() interface{} { return ({{.Type}})(*f.v) }
func (f *{{.|ValueName}}) String() string { return {{.|Format}} }
{{if .Help}}
// {{.Help}}
{{else -}}
// {{.|Name}} parses the next command-line value as {{.Type}}.
{{end -}}
func (p *parserMixin) {{.|Name}}() (target *{{.Type}}) {
target = new({{.Type}})
p.{{.|Name}}Var(target)
return
}
func (p *parserMixin) {{.|Name}}Var(target *{{.Type}}) {
p.SetValue(new{{.|Name}}Value(target))
}
{{end}}
// {{.|Plural}} accumulates {{.Type}} values into a slice.
func (p *parserMixin) {{.|Plural}}() (target *[]{{.Type}}) {
target = new([]{{.Type}})
p.{{.|Plural}}Var(target)
return
}
func (p *parserMixin) {{.|Plural}}Var(target *[]{{.Type}}) {
p.SetValue(newAccumulator(target, func(v interface{}) Value {
return new{{.|Name}}Value(v.(*{{.Type}}))
}))
}
{{end}}
`
)
type Value struct {
Name string `json:"name"`
NoValueParser bool `json:"no_value_parser"`
Type string `json:"type"`
Parser string `json:"parser"`
Format string `json:"format"`
Plural string `json:"plural"`
Help string `json:"help"`
}
func fatalIfError(err error) {
if err != nil {
panic(err)
}
}
func main() {
r, err := os.Open("values.json")
fatalIfError(err)
defer r.Close()
v := []Value{}
err = json.NewDecoder(r).Decode(&v)
fatalIfError(err)
valueName := func(v *Value) string {
if v.Name != "" {
return v.Name
}
return strings.Title(v.Type)
}
t, err := template.New("genvalues").Funcs(template.FuncMap{
"Lower": strings.ToLower,
"Format": func(v *Value) string {
if v.Format != "" {
return v.Format
}
return "fmt.Sprintf(\"%v\", *f.v)"
},
"ValueName": func(v *Value) string {
name := valueName(v)
return strings.ToLower(name[0:1]) + name[1:] + "Value"
},
"Name": valueName,
"Plural": func(v *Value) string {
if v.Plural != "" {
return v.Plural
}
return valueName(v) + "List"
},
}).Parse(tmpl)
fatalIfError(err)
w, err := os.Create("values_generated.go")
fatalIfError(err)
defer w.Close()
err = t.Execute(w, v)
fatalIfError(err)
err = exec.Command("goimports", "-w", "values_generated.go").Run()
fatalIfError(err)
}