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util.go
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util.go
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/*
* Copyright (c) 2019 QLC Chain Team
*
* This software is released under the MIT License.
* https://opensource.org/licenses/MIT
*/
package util
import (
"fmt"
"strconv"
"strings"
"github.com/abiosoft/ishell"
"github.com/fatih/color"
"github.com/sahilm/fuzzy"
)
var prefix = "--"
type Flag struct {
Name string
Usage string
Must bool
Value interface{}
}
func sliceIndex(array []string, s string) int {
for i, a := range array {
if a == s {
return i
}
}
return -1
}
func StringVar(rawArgs []string, args Flag) string {
i := sliceIndex(rawArgs, prefix+args.Name)
if i < 0 || i+1 >= len(rawArgs) {
return args.Value.(string)
}
s := rawArgs[i+1]
return s
}
func StringSliceVar(rawArgs []string, args Flag) []string {
i := sliceIndex(rawArgs, prefix+args.Name)
if i < 0 || i+1 >= len(rawArgs) {
s, ok := args.Value.(string)
if !ok {
return nil
}
if len(s) <= 0 {
return nil
}
return strings.Split(s, ",")
}
s := rawArgs[i+1]
return strings.Split(s, ",")
}
func IntVar(rawArgs []string, args Flag) (int, error) {
i := sliceIndex(rawArgs, prefix+args.Name)
if i < 0 || i+1 >= len(rawArgs) {
return args.Value.(int), nil
}
s := rawArgs[i+1]
c, err := strconv.Atoi(s)
if err != nil {
return -1, err
}
return c, nil
}
func BoolVar(rawArgs []string, args Flag) bool {
i := sliceIndex(rawArgs, prefix+args.Name)
if i < 0 || i+1 >= len(rawArgs) {
return args.Value.(bool)
}
s := rawArgs[i+1]
c, err := strconv.ParseBool(s)
if err != nil {
return false
}
return c
}
func CheckArgs(c *ishell.Context, args []Flag) error {
// help
rawArgs := c.Args
argsMap := make(map[string]interface{})
//args = append(args, commonFlag...)
for _, a := range args {
argsMap[prefix+a.Name] = a.Value
i := sliceIndex(rawArgs, prefix+a.Name)
if i < 0 && a.Must {
return fmt.Errorf("lack parameter: %s", a.Name)
}
if i >= 0 {
if a.Value == true || a.Value == false {
if len(rawArgs) <= i {
return fmt.Errorf("lack value for parameter: %s", a.Name)
}
} else {
if len(rawArgs) <= i+1 {
return fmt.Errorf("lack value for parameter: %s", a.Name)
}
}
}
}
index := 0
for index < len(rawArgs) {
if _, ok := argsMap[rawArgs[index]]; ok {
if argsMap[rawArgs[index]] == true || argsMap[rawArgs[index]] == false {
index = index + 1
} else {
index = index + 2
}
} else {
return fmt.Errorf("'%s' is not a qlcc command. Please see 'COMMAND --help'", rawArgs[index])
}
}
return nil
}
func HelpText(c *ishell.Context, args []Flag) bool {
rawArgs := c.Args
if len(rawArgs) == 1 && rawArgs[0] == prefix+"help" {
fmt.Println(c.Cmd.HelpText())
if len(args) == 0 {
return true
}
fmt.Println("args:")
for _, a := range args {
var t string
if a.Must {
t = fmt.Sprintf(" %s%-12s %s", prefix, a.Name, a.Usage)
} else {
t = fmt.Sprintf(" %s%-12s (Optional) %s", prefix, a.Name, a.Usage)
}
fmt.Println(t)
}
fmt.Println()
return true
}
return false
}
func infoPrefix() {
color.Set(color.FgMagenta, color.Bold)
defer color.Unset()
fmt.Print("==> ")
}
func Info(a ...interface{}) {
infoPrefix()
fmt.Println(a...)
}
func warnPrefix() {
color.Set(color.FgMagenta, color.Bold)
defer color.Unset()
fmt.Print("warn ")
}
func Warn(a ...interface{}) {
warnPrefix()
fmt.Println(a...)
}
// OptsCompleter creates completer function for ishell from list of opts
func OptsCompleter(args []Flag) func(prefix string, args []string) []string {
opts := make([]string, 0)
for _, a := range args {
opts = append(opts, prefix+a.Name)
}
opts = append(opts, prefix+"help")
return func(prefix string, args []string) []string {
if prefix == "" {
return opts
}
var completion []string
matches := fuzzy.Find(prefix, opts)
for _, match := range matches {
completion = append(completion, match.Str)
}
return completion
}
}