302 lines
8.6 KiB
Go
302 lines
8.6 KiB
Go
// Copyright 2020 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package flags
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import (
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"fmt"
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"os"
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"regexp"
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"sort"
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"strings"
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"github.com/ethereum/go-ethereum/internal/version"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/params"
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"github.com/mattn/go-isatty"
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"github.com/urfave/cli/v2"
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)
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// usecolor defines whether the CLI help should use colored output or normal dumb
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// colorless terminal formatting.
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var usecolor = (isatty.IsTerminal(os.Stdout.Fd()) || isatty.IsCygwinTerminal(os.Stdout.Fd())) && os.Getenv("TERM") != "dumb"
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// NewApp creates an app with sane defaults.
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func NewApp(usage string) *cli.App {
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git, _ := version.VCS()
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app := cli.NewApp()
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app.EnableBashCompletion = true
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app.Version = params.VersionWithCommit(git.Commit, git.Date)
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app.Usage = usage
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app.Copyright = "Copyright 2013-2023 The go-ethereum Authors"
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app.Before = func(ctx *cli.Context) error {
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MigrateGlobalFlags(ctx)
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return nil
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}
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return app
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}
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// Merge merges the given flag slices.
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func Merge(groups ...[]cli.Flag) []cli.Flag {
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var ret []cli.Flag
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for _, group := range groups {
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ret = append(ret, group...)
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}
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return ret
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}
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var migrationApplied = map[*cli.Command]struct{}{}
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// MigrateGlobalFlags makes all global flag values available in the
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// context. This should be called as early as possible in app.Before.
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//
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// Example:
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//
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// geth account new --keystore /tmp/mykeystore --lightkdf
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//
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// is equivalent after calling this method with:
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//
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// geth --keystore /tmp/mykeystore --lightkdf account new
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//
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// i.e. in the subcommand Action function of 'account new', ctx.Bool("lightkdf)
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// will return true even if --lightkdf is set as a global option.
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//
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// This function may become unnecessary when https://github.com/urfave/cli/pull/1245 is merged.
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func MigrateGlobalFlags(ctx *cli.Context) {
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var iterate func(cs []*cli.Command, fn func(*cli.Command))
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iterate = func(cs []*cli.Command, fn func(*cli.Command)) {
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for _, cmd := range cs {
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if _, ok := migrationApplied[cmd]; ok {
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continue
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}
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migrationApplied[cmd] = struct{}{}
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fn(cmd)
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iterate(cmd.Subcommands, fn)
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}
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}
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// This iterates over all commands and wraps their action function.
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iterate(ctx.App.Commands, func(cmd *cli.Command) {
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if cmd.Action == nil {
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return
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}
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action := cmd.Action
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cmd.Action = func(ctx *cli.Context) error {
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doMigrateFlags(ctx)
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return action(ctx)
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}
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})
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}
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func doMigrateFlags(ctx *cli.Context) {
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// Figure out if there are any aliases of commands. If there are, we want
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// to ignore them when iterating over the flags.
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var aliases = make(map[string]bool)
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for _, fl := range ctx.Command.Flags {
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for _, alias := range fl.Names()[1:] {
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aliases[alias] = true
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}
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}
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for _, name := range ctx.FlagNames() {
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for _, parent := range ctx.Lineage()[1:] {
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if parent.IsSet(name) {
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// When iterating across the lineage, we will be served both
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// the 'canon' and alias formats of all commmands. In most cases,
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// it's fine to set it in the ctx multiple times (one for each
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// name), however, the Slice-flags are not fine.
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// The slice-flags accumulate, so if we set it once as
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// "foo" and once as alias "F", then both will be present in the slice.
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if _, isAlias := aliases[name]; isAlias {
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continue
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}
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// If it is a string-slice, we need to set it as
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// "alfa, beta, gamma" instead of "[alfa beta gamma]", in order
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// for the backing StringSlice to parse it properly.
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if result := parent.StringSlice(name); len(result) > 0 {
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ctx.Set(name, strings.Join(result, ","))
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} else {
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ctx.Set(name, parent.String(name))
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}
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break
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}
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}
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}
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}
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func init() {
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if usecolor {
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// Annotate all help categories with colors
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cli.AppHelpTemplate = regexp.MustCompile("[A-Z ]+:").ReplaceAllString(cli.AppHelpTemplate, "\u001B[33m$0\u001B[0m")
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// Annotate flag categories with colors (private template, so need to
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// copy-paste the entire thing here...)
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cli.AppHelpTemplate = strings.ReplaceAll(cli.AppHelpTemplate, "{{template \"visibleFlagCategoryTemplate\" .}}", "{{range .VisibleFlagCategories}}\n {{if .Name}}\u001B[33m{{.Name}}\u001B[0m\n\n {{end}}{{$flglen := len .Flags}}{{range $i, $e := .Flags}}{{if eq (subtract $flglen $i) 1}}{{$e}}\n{{else}}{{$e}}\n {{end}}{{end}}{{end}}")
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}
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cli.FlagStringer = FlagString
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}
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// FlagString prints a single flag in help.
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func FlagString(f cli.Flag) string {
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df, ok := f.(cli.DocGenerationFlag)
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if !ok {
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return ""
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}
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needsPlaceholder := df.TakesValue()
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placeholder := ""
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if needsPlaceholder {
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placeholder = "value"
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}
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namesText := cli.FlagNamePrefixer(df.Names(), placeholder)
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defaultValueString := ""
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if s := df.GetDefaultText(); s != "" {
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defaultValueString = " (default: " + s + ")"
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}
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envHint := strings.TrimSpace(cli.FlagEnvHinter(df.GetEnvVars(), ""))
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if envHint != "" {
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envHint = " (" + envHint[1:len(envHint)-1] + ")"
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}
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usage := strings.TrimSpace(df.GetUsage())
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usage = wordWrap(usage, 80)
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usage = indent(usage, 10)
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if usecolor {
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return fmt.Sprintf("\n \u001B[32m%-35s%-35s\u001B[0m%s\n%s", namesText, defaultValueString, envHint, usage)
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} else {
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return fmt.Sprintf("\n %-35s%-35s%s\n%s", namesText, defaultValueString, envHint, usage)
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}
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}
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func indent(s string, nspace int) string {
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ind := strings.Repeat(" ", nspace)
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return ind + strings.ReplaceAll(s, "\n", "\n"+ind)
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}
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func wordWrap(s string, width int) string {
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var (
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output strings.Builder
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lineLength = 0
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)
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for {
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sp := strings.IndexByte(s, ' ')
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var word string
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if sp == -1 {
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word = s
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} else {
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word = s[:sp]
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}
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wlen := len(word)
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over := lineLength+wlen >= width
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if over {
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output.WriteByte('\n')
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lineLength = 0
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} else {
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if lineLength != 0 {
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output.WriteByte(' ')
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lineLength++
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}
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}
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output.WriteString(word)
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lineLength += wlen
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if sp == -1 {
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break
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}
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s = s[wlen+1:]
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}
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return output.String()
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}
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// AutoEnvVars extends all the specific CLI flags with automatically generated
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// env vars by capitalizing the flag, replacing . with _ and prefixing it with
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// the specified string.
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//
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// Note, the prefix should *not* contain the separator underscore, that will be
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// added automatically.
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func AutoEnvVars(flags []cli.Flag, prefix string) {
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for _, flag := range flags {
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envvar := strings.ToUpper(prefix + "_" + strings.ReplaceAll(strings.ReplaceAll(flag.Names()[0], ".", "_"), "-", "_"))
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switch flag := flag.(type) {
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case *cli.StringFlag:
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flag.EnvVars = append(flag.EnvVars, envvar)
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case *cli.BoolFlag:
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flag.EnvVars = append(flag.EnvVars, envvar)
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case *cli.IntFlag:
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flag.EnvVars = append(flag.EnvVars, envvar)
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case *cli.Uint64Flag:
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flag.EnvVars = append(flag.EnvVars, envvar)
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case *cli.DurationFlag:
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flag.EnvVars = append(flag.EnvVars, envvar)
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case *cli.PathFlag:
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flag.EnvVars = append(flag.EnvVars, envvar)
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case *BigFlag:
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flag.EnvVars = append(flag.EnvVars, envvar)
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case *TextMarshalerFlag:
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flag.EnvVars = append(flag.EnvVars, envvar)
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case *DirectoryFlag:
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flag.EnvVars = append(flag.EnvVars, envvar)
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}
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}
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}
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// CheckEnvVars iterates over all the environment variables and checks if any of
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// them look like a CLI flag but is not consumed. This can be used to detect old
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// or mistyped names.
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func CheckEnvVars(ctx *cli.Context, flags []cli.Flag, prefix string) {
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known := make(map[string]string)
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for _, flag := range flags {
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docflag, ok := flag.(cli.DocGenerationFlag)
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if !ok {
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continue
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}
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for _, envvar := range docflag.GetEnvVars() {
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known[envvar] = flag.Names()[0]
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}
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}
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keyvals := os.Environ()
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sort.Strings(keyvals)
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for _, keyval := range keyvals {
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key := strings.Split(keyval, "=")[0]
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if !strings.HasPrefix(key, prefix) {
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continue
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}
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if flag, ok := known[key]; ok {
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if ctx.Count(flag) > 0 {
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log.Info("Config environment variable found", "envvar", key, "shadowedby", "--"+flag)
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} else {
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log.Info("Config environment variable found", "envvar", key)
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}
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} else {
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log.Warn("Unknown config environment variable", "envvar", key)
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}
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}
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}
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