Fantom-foundation/go-lachesis

// Copyright 2020 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.

package flags

import (
    "os"
    "path/filepath"

    "github.com/ethereum/go-ethereum/params"
    cli "gopkg.in/urfave/cli.v1"
)

var (
    CommandHelpTemplate = `{{.cmd.Name}}{{if .cmd.Subcommands}} command{{end}}{{if .cmd.Flags}} [command options]{{end}} [arguments...]
{{if .cmd.Description}}{{.cmd.Description}}
{{end}}{{if .cmd.Subcommands}}
SUBCOMMANDS:
  {{range .cmd.Subcommands}}{{.Name}}{{with .ShortName}}, {{.}}{{end}}{{ "\t" }}{{.Usage}}
  {{end}}{{end}}{{if .categorizedFlags}}
{{range $idx, $categorized := .categorizedFlags}}{{$categorized.Name}} OPTIONS:
{{range $categorized.Flags}}{{"\t"}}{{.}}
{{end}}
{{end}}{{end}}`

    OriginCommandHelpTemplate = `{{.Name}}{{if .Subcommands}} command{{end}}{{if .Flags}} [command options]{{end}} [arguments...]
{{if .Description}}{{.Description}}
{{end}}{{if .Subcommands}}
SUBCOMMANDS:
  {{range .Subcommands}}{{.Name}}{{with .ShortName}}, {{.}}{{end}}{{ "\t" }}{{.Usage}}
  {{end}}{{end}}{{if .Flags}}
OPTIONS:
{{range $.Flags}}   {{.}}
{{end}}
{{end}}`

    // AppHelpTemplate is the test template for the default, global app help topic.
    AppHelpTemplate = `NAME:
   {{.App.Name}} - {{.App.Usage}}

   Copyright 2013-2019 The go-ethereum Authors

USAGE:
   {{.App.HelpName}} [options]{{if .App.Commands}} command [command options]{{end}} {{if .App.ArgsUsage}}{{.App.ArgsUsage}}{{else}}[arguments...]{{end}}
   {{if .App.Version}}
VERSION:
   {{.App.Version}}
   {{end}}{{if len .App.Authors}}
AUTHOR(S):
   {{range .App.Authors}}{{ . }}{{end}}
   {{end}}{{if .App.Commands}}
COMMANDS:
   {{range .App.Commands}}{{join .Names ", "}}{{ "\t" }}{{.Usage}}
   {{end}}{{end}}{{if .FlagGroups}}
{{range .FlagGroups}}{{.Name}} OPTIONS:
  {{range .Flags}}{{.}}
  {{end}}
{{end}}{{end}}{{if .App.Copyright }}
COPYRIGHT:
   {{.App.Copyright}}
   {{end}}
`
    // ClefAppHelpTemplate is the template for the default, global app help topic.
    ClefAppHelpTemplate = `NAME:
   {{.App.Name}} - {{.App.Usage}}

   Copyright 2013-2019 The go-ethereum Authors

USAGE:
   {{.App.HelpName}} [options]{{if .App.Commands}} command [command options]{{end}} {{if .App.ArgsUsage}}{{.App.ArgsUsage}}{{else}}[arguments...]{{end}}
   {{if .App.Version}}
COMMANDS:
   {{range .App.Commands}}{{join .Names ", "}}{{ "\t" }}{{.Usage}}
   {{end}}{{end}}{{if .FlagGroups}}
{{range .FlagGroups}}{{.Name}} OPTIONS:
  {{range .Flags}}{{.}}
  {{end}}
{{end}}{{end}}{{if .App.Copyright }}
COPYRIGHT:
   {{.App.Copyright}}
   {{end}}
`
)

// HelpData is a one shot struct to pass to the usage template
type HelpData struct {
    App        interface{}
    FlagGroups []FlagGroup
}

// FlagGroup is a collection of flags belonging to a single topic.
type FlagGroup struct {
    Name  string
    Flags []cli.Flag
}

// byCategory sorts an array of FlagGroup by Name in the order
// defined in AppHelpFlagGroups.
type ByCategory []FlagGroup

func (a ByCategory) Len() int      { return len(a) }
func (a ByCategory) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
func (a ByCategory) Less(i, j int) bool {
    iCat, jCat := a[i].Name, a[j].Name
    iIdx, jIdx := len(a), len(a) // ensure non categorized flags come last

    for i, group := range a {
        if iCat == group.Name {
            iIdx = i
        }
        if jCat == group.Name {
            jIdx = i
        }
    }

    return iIdx < jIdx
}

func FlagCategory(flag cli.Flag, flagGroups []FlagGroup) string {
    for _, category := range flagGroups {
        for _, flg := range category.Flags {
            if flg.GetName() == flag.GetName() {
                return category.Name
            }
        }
    }
    return "MISC"
}

// NewApp creates an app with sane defaults.
func NewApp(gitCommit, gitDate, usage string) *cli.App {
    app := cli.NewApp()
    app.Name = filepath.Base(os.Args[0])
    app.Author = ""
    app.Email = ""
    app.Version = params.VersionWithCommit(gitCommit, gitDate)
    app.Usage = usage
    return app
}