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// Copyright 2015 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 utils
import (
"errors"
"flag"
"fmt"
"math/big"
"os"
"os/user"
"path"
"strings"
"github.com/ethereum/go-ethereum/common/math"
"gopkg.in/urfave/cli.v1"
)
// Custom type which is registered in the flags library which cli uses for
// argument parsing. This allows us to expand Value to an absolute path when
// the argument is parsed
type DirectoryString struct {
Value string
}
func (self *DirectoryString) String() string {
return self.Value
}
func (self *DirectoryString) Set(value string) error {
self.Value = expandPath(value)
return nil
}
// Custom cli.Flag type which expand the received string to an absolute path.
// e.g. ~/.ethereum -> /home/username/.ethereum
type DirectoryFlag struct {
Name string
Value DirectoryString
Usage string
}
func (self DirectoryFlag) String() string {
fmtString := "%s %v\t%v"
if len(self.Value.Value) > 0 {
fmtString = "%s \"%v\"\t%v"
}
return fmt.Sprintf(fmtString, prefixedNames(self.Name), self.Value.Value, self.Usage)
}
func eachName(longName string, fn func(string)) {
parts := strings.Split(longName, ",")
for _, name := range parts {
name = strings.Trim(name, " ")
fn(name)
}
}
// called by cli library, grabs variable from environment (if in env)
// and adds variable to flag set for parsing.
func (self DirectoryFlag) Apply(set *flag.FlagSet) {
eachName(self.Name, func(name string) {
set.Var(&self.Value, self.Name, self.Usage)
})
}
// BigFlag is a command line flag that accepts 256 bit big integers in decimal or
// hexadecimal syntax.
type BigFlag struct {
Name string
Value *big.Int
Usage string
}
// bigValue turns *big.Int into a flag.Value
type bigValue big.Int
func (b *bigValue) String() string {
if b == nil {
return ""
}
return (*big.Int)(b).String()
}
func (b *bigValue) Set(s string) error {
int, ok := math.ParseBig256(s)
if !ok {
return errors.New("invalid integer syntax")
}
*b = (bigValue)(*int)
return nil
}
func (f BigFlag) GetName() string {
return f.Name
}
func (f BigFlag) String() string {
fmtString := "%s %v\t%v"
if f.Value != nil {
fmtString = "%s \"%v\"\t%v"
}
return fmt.Sprintf(fmtString, prefixedNames(f.Name), f.Value, f.Usage)
}
func (f BigFlag) Apply(set *flag.FlagSet) {
eachName(f.Name, func(name string) {
set.Var((*bigValue)(f.Value), f.Name, f.Usage)
})
}
// GlobalBig returns the value of a BigFlag from the global flag set.
func GlobalBig(ctx *cli.Context, name string) *big.Int {
val := ctx.GlobalGeneric(name)
if val == nil {
return nil
}
return (*big.Int)(val.(*bigValue))
}
func prefixFor(name string) (prefix string) {
if len(name) == 1 {
prefix = "-"
} else {
prefix = "--"
}
return
}
func prefixedNames(fullName string) (prefixed string) {
parts := strings.Split(fullName, ",")
for i, name := range parts {
name = strings.Trim(name, " ")
prefixed += prefixFor(name) + name
if i < len(parts)-1 {
prefixed += ", "
}
}
return
}
func (self DirectoryFlag) GetName() string {
return self.Name
}
func (self *DirectoryFlag) Set(value string) {
self.Value.Value = value
}
// Expands a file path
// 1. replace tilde with users home dir
// 2. expands embedded environment variables
// 3. cleans the path, e.g. /a/b/../c -> /a/c
// Note, it has limitations, e.g. ~someuser/tmp will not be expanded
func expandPath(p string) string {
if strings.HasPrefix(p, "~/") || strings.HasPrefix(p, "~\\") {
if home := homeDir(); home != "" {
p = home + p[1:]
}
}
return path.Clean(os.ExpandEnv(p))
}
func homeDir() string {
if home := os.Getenv("HOME"); home != "" {
return home
}
if usr, err := user.Current(); err == nil {
return usr.HomeDir
}
return ""
}
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