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// Copyright 2020 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package flags
import (
"fmt"
"strings"
"github.com/ethereum/go-ethereum/internal/version"
"github.com/ethereum/go-ethereum/params"
"github.com/urfave/cli/v2"
)
// NewApp creates an app with sane defaults.
func NewApp(usage string) *cli.App {
git, _ := version.VCS()
app := cli.NewApp()
app.EnableBashCompletion = true
app.Version = params.VersionWithCommit(git.Commit, git.Date)
app.Usage = usage
app.Copyright = "Copyright 2013-2022 The go-ethereum Authors"
app.Before = func(ctx *cli.Context) error {
MigrateGlobalFlags(ctx)
return nil
}
return app
}
// Merge merges the given flag slices.
func Merge(groups ...[]cli.Flag) []cli.Flag {
var ret []cli.Flag
for _, group := range groups {
ret = append(ret, group...)
}
return ret
}
var migrationApplied = map[*cli.Command]struct{}{}
// MigrateGlobalFlags makes all global flag values available in the
// context. This should be called as early as possible in app.Before.
//
// Example:
//
// geth account new --keystore /tmp/mykeystore --lightkdf
//
// is equivalent after calling this method with:
//
// geth --keystore /tmp/mykeystore --lightkdf account new
//
// i.e. in the subcommand Action function of 'account new', ctx.Bool("lightkdf)
// will return true even if --lightkdf is set as a global option.
//
// This function may become unnecessary when https://github.com/urfave/cli/pull/1245 is merged.
func MigrateGlobalFlags(ctx *cli.Context) {
var iterate func(cs []*cli.Command, fn func(*cli.Command))
iterate = func(cs []*cli.Command, fn func(*cli.Command)) {
for _, cmd := range cs {
if _, ok := migrationApplied[cmd]; ok {
continue
}
migrationApplied[cmd] = struct{}{}
fn(cmd)
iterate(cmd.Subcommands, fn)
}
}
// This iterates over all commands and wraps their action function.
iterate(ctx.App.Commands, func(cmd *cli.Command) {
if cmd.Action == nil {
return
}
action := cmd.Action
cmd.Action = func(ctx *cli.Context) error {
doMigrateFlags(ctx)
return action(ctx)
}
})
}
func doMigrateFlags(ctx *cli.Context) {
for _, name := range ctx.FlagNames() {
for _, parent := range ctx.Lineage()[1:] {
if parent.IsSet(name) {
ctx.Set(name, parent.String(name))
break
}
}
}
}
func init() {
cli.FlagStringer = FlagString
}
// FlagString prints a single flag in help.
func FlagString(f cli.Flag) string {
df, ok := f.(cli.DocGenerationFlag)
if !ok {
return ""
}
needsPlaceholder := df.TakesValue()
placeholder := ""
if needsPlaceholder {
placeholder = "value"
}
namesText := pad(cli.FlagNamePrefixer(df.Names(), placeholder), 30)
defaultValueString := ""
if s := df.GetDefaultText(); s != "" {
defaultValueString = " (default: " + s + ")"
}
usage := strings.TrimSpace(df.GetUsage())
envHint := strings.TrimSpace(cli.FlagEnvHinter(df.GetEnvVars(), ""))
if len(envHint) > 0 {
usage += " " + envHint
}
usage = wordWrap(usage, 80)
usage = indent(usage, 10)
return fmt.Sprintf("\n %s%s\n%s", namesText, defaultValueString, usage)
}
func pad(s string, length int) string {
if len(s) < length {
s += strings.Repeat(" ", length-len(s))
}
return s
}
func indent(s string, nspace int) string {
ind := strings.Repeat(" ", nspace)
return ind + strings.ReplaceAll(s, "\n", "\n"+ind)
}
func wordWrap(s string, width int) string {
var (
output strings.Builder
lineLength = 0
)
for {
sp := strings.IndexByte(s, ' ')
var word string
if sp == -1 {
word = s
} else {
word = s[:sp]
}
wlen := len(word)
over := lineLength+wlen >= width
if over {
output.WriteByte('\n')
lineLength = 0
} else {
if lineLength != 0 {
output.WriteByte(' ')
lineLength++
}
}
output.WriteString(word)
lineLength += wlen
if sp == -1 {
break
}
s = s[wlen+1:]
}
return output.String()
}