package main //go:generate go run assets_generate.go import ( "encoding/json" "fmt" "github.com/urfave/cli" "io/ioutil" "log" "os" "text/template" ) type CliFlagInfo struct { PackageName string Flags []FlagType } type FlagType struct { Name string `json:"name"` Type string `json:"type"` Value bool `json:"value"` Destination bool `json:"dest"` Doctail string `json:"doctail"` ContextDefault string `json:"context_default"` ContextType string `json:"context_type"` Parser string `json:"parser"` ParserCast string `json:"parser_cast"` } func main() { app := cli.NewApp() app.Name = "flag-generator" app.Usage = "Generate flag type code!" app.Action = ActionFunc err := app.Run(os.Args) if err != nil { log.Fatal(err) } } func ActionFunc(_ *cli.Context) error { var info CliFlagInfo var tpl *template.Template inFile, err := assets.Open("/source/flag-types.json") if err != nil { log.Fatal(err) } decoder := json.NewDecoder(inFile) err = decoder.Decode(&info.Flags) if err != nil { log.Fatal(err) } err = inFile.Close() if err != nil { log.Fatal(err) } for _, packageName := range []string{"cli", "altsrc"} { info.PackageName = packageName bytes, err := ReadTemplate(packageName) if err != nil { log.Fatal(err) } tpl = template.Must(template.New("").Parse(string(bytes))) var outFile *os.File if packageName == "cli" { outFile, err = os.Create("flag_generated.go") } else { outFile, err = os.Create("altsrc/flag_generated.go") } if err != nil { log.Fatal(err) } err = tpl.Execute(outFile, info) if err != nil { log.Fatal(err) } err = outFile.Close() if err != nil { log.Fatal(err) } } return nil } func ReadTemplate(packageName string) ([]byte, error) { templateFile, err := assets.Open(fmt.Sprintf("/templates/%s_flags_generated.gotpl", packageName)) if err != nil { return nil, err } templateFileBytes, err := ioutil.ReadAll(templateFile) if err != nil { return nil, err } return templateFileBytes, nil }