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package main
// Self-written getopt to support multi-argument options.
import (
"fmt"
"io"
"strings"
"text/tabwriter"
"unicode/utf8"
)
type Options struct {
options []*option
}
func NewOptions() *Options {
return new(Options)
}
func (o *Options) AddFlagGroup(shortName rune, longName, argDescription, description string) *FlagGroup {
grp := new(FlagGroup)
opt := &option{shortName, longName, argDescription, description, grp}
o.options = append(o.options, opt)
return grp
}
func (o *Options) AddFlagVar(shortName rune, longName string, pflag *bool, defval bool, description string) {
*pflag = defval
opt := &option{shortName, longName, "", description, pflag}
o.options = append(o.options, opt)
}
func (o *Options) Parse(args []string) (remainingArgs []string, err error) {
var skip int
for i := 1; i < len(args) && err == nil; i++ {
arg := args[i]
switch {
case arg == "--":
remainingArgs = append(remainingArgs, args[i+1:]...)
return
case hasPrefix(arg, "--"):
skip, err = o.parseLongOption(args, i, arg[2:])
i += skip
case hasPrefix(arg, "-"):
skip, err = o.parseShortOptions(args, i, arg[1:])
i += skip
default:
remainingArgs = append(remainingArgs, arg)
}
}
if err != nil {
err = optErr(args[0] + ": " + err.Error())
}
return
}
func (o *Options) parseLongOption(args []string, i int, argRest string) (skip int, err error) {
parts := strings.SplitN(argRest, "=", 2)
argname := parts[0]
var argval *string
if 1 < len(parts) {
argval = &parts[1]
}
for _, opt := range o.options {
if argname == opt.longName {
return o.handleLongOption(args, i, opt, argval)
}
}
var prefixOpt *option
for _, opt := range o.options {
if strings.HasPrefix(opt.longName, argname) {
if prefixOpt == nil {
prefixOpt = opt
} else {
return 0, optErr(fmt.Sprintf("ambiguous option: --%s could mean --%s or --%s", argRest, prefixOpt.longName, opt.longName))
}
}
}
if prefixOpt != nil {
return o.handleLongOption(args, i, prefixOpt, argval)
}
return 0, optErr("unknown option: --" + argRest)
}
func (o *Options) handleLongOption(args []string, i int, opt *option, argval *string) (skip int, err error) {
switch data := opt.data.(type) {
case *bool:
if argval == nil {
*data = true
} else {
switch *argval {
case "true", "on", "enabled", "1":
*data = true
case "false", "off", "disabled", "0":
*data = false
default:
return 0, optErr("invalid argument for option --" + opt.longName)
}
}
return 0, nil
case *FlagGroup:
if argval == nil {
return 1, data.parse("--"+opt.longName+"=", args[i+1])
} else {
return 0, data.parse("--"+opt.longName+"=", *argval)
}
}
panic("getopt: unknown option type")
}
func (o *Options) parseShortOptions(args []string, i int, optchars string) (skip int, err error) {
optchar:
for ai, optchar := range optchars {
for _, opt := range o.options {
if optchar == opt.shortName {
switch data := opt.data.(type) {
case *bool:
*data = true
continue optchar
case *FlagGroup:
argarg := optchars[ai+utf8.RuneLen(optchar):]
if argarg != "" {
return 0, data.parse(string([]rune{'-', optchar}), argarg)
} else if i+1 < len(args) {
return 1, data.parse(string([]rune{'-', optchar}), args[i+1])
} else {
return 0, optErr("option requires an argument: -" + string([]rune{optchar}))
}
}
}
}
return 0, optErr("unknown option: -" + string([]rune{optchar}))
}
return 0, nil
}
func (o *Options) Help(out io.Writer, generalUsage string) {
wr := tabwriter.NewWriter(out, 1, 0, 2, ' ', tabwriter.TabIndent)
io.WriteString(wr, "usage: "+generalUsage+"\n")
io.WriteString(wr, "\n")
wr.Flush()
for _, opt := range o.options {
if opt.argDescription == "" {
fmt.Fprintf(wr, " -%c, --%s\t %s\n",
opt.shortName, opt.longName, opt.description)
} else {
fmt.Fprintf(wr, " -%c, --%s=%s\t %s\n",
opt.shortName, opt.longName, opt.argDescription, opt.description)
}
}
wr.Flush()
hasFlagGroups := false
for _, opt := range o.options {
switch flagGroup := opt.data.(type) {
case *FlagGroup:
hasFlagGroups = true
io.WriteString(wr, "\n")
fmt.Fprintf(wr, " Flags for -%c, --%s:\n", opt.shortName, opt.longName)
io.WriteString(wr, " all\t all of the following\n")
io.WriteString(wr, " none\t none of the following\n")
for _, flag := range flagGroup.flags {
fmt.Fprintf(wr, " %s\t %s (%v)\n", flag.name, flag.help, ifelseStr(*flag.value, "enabled", "disabled"))
}
wr.Flush()
}
}
if hasFlagGroups {
io.WriteString(wr, "\n")
io.WriteString(wr, " (Prefix a flag with \"no-\" to disable it.)\n")
wr.Flush()
}
}
type option struct {
shortName rune
longName string
argDescription string
description string
data interface{}
}
type FlagGroup struct {
flags []*groupFlag
}
func (fg *FlagGroup) AddFlagVar(name string, flag *bool, defval bool, help string) {
opt := &groupFlag{name, flag, help}
fg.flags = append(fg.flags, opt)
*flag = defval
}
func (fg *FlagGroup) parse(optionPrefix, arg string) (err error) {
argopt:
for _, argopt := range strings.Split(arg, ",") {
if argopt == "none" || argopt == "all" {
for _, opt := range fg.flags {
*opt.value = argopt == "all"
}
continue argopt
}
for _, opt := range fg.flags {
if argopt == opt.name {
*opt.value = true
continue argopt
}
if argopt == "no-"+opt.name {
*opt.value = false
continue argopt
}
}
return optErr("unknown option: " + optionPrefix + argopt)
}
return nil
}
type groupFlag struct {
name string
value *bool
help string
}
type optErr string
func (err optErr) Error() string {
return string(err)
}
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