133 lines
2.9 KiB
Go
133 lines
2.9 KiB
Go
package utils
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import (
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"flag"
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"fmt"
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"os"
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"os/user"
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"path/filepath"
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"strings"
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"github.com/codegangsta/cli"
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)
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// Custom type which is registered in the flags library which cli uses for
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// argument parsing. This allows us to expand Value to an absolute path when
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// the argument is parsed
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type DirectoryString struct {
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Value string
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}
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func (self *DirectoryString) String() string {
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return self.Value
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}
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func (self *DirectoryString) Set(value string) error {
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self.Value = expandPath(value)
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return nil
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}
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// Custom cli.Flag type which expand the received string to an absolute path.
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// e.g. ~/.ethereum -> /home/username/.ethereum
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type DirectoryFlag struct {
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cli.GenericFlag
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Name string
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Value DirectoryString
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Usage string
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EnvVar string
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}
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func (self DirectoryFlag) String() string {
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var fmtString string
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fmtString = "%s %v\t%v"
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if len(self.Value.Value) > 0 {
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fmtString = "%s \"%v\"\t%v"
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} else {
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fmtString = "%s %v\t%v"
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}
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return withEnvHint(self.EnvVar, fmt.Sprintf(fmtString, prefixedNames(self.Name), self.Value.Value, self.Usage))
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}
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func eachName(longName string, fn func(string)) {
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parts := strings.Split(longName, ",")
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for _, name := range parts {
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name = strings.Trim(name, " ")
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fn(name)
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}
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}
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// called by cli library, grabs variable from environment (if in env)
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// and adds variable to flag set for parsing.
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func (self DirectoryFlag) Apply(set *flag.FlagSet) {
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if self.EnvVar != "" {
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for _, envVar := range strings.Split(self.EnvVar, ",") {
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envVar = strings.TrimSpace(envVar)
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if envVal := os.Getenv(envVar); envVal != "" {
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self.Value.Value = envVal
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break
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}
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}
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}
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eachName(self.Name, func(name string) {
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set.Var(&self.Value, self.Name, self.Usage)
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})
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}
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func prefixFor(name string) (prefix string) {
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if len(name) == 1 {
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prefix = "-"
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} else {
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prefix = "--"
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}
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return
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}
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func prefixedNames(fullName string) (prefixed string) {
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parts := strings.Split(fullName, ",")
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for i, name := range parts {
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name = strings.Trim(name, " ")
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prefixed += prefixFor(name) + name
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if i < len(parts)-1 {
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prefixed += ", "
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}
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}
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return
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}
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func withEnvHint(envVar, str string) string {
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envText := ""
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if envVar != "" {
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envText = fmt.Sprintf(" [$%s]", strings.Join(strings.Split(envVar, ","), ", $"))
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}
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return str + envText
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}
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func (self DirectoryFlag) getName() string {
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return self.Name
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}
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func (self *DirectoryFlag) Set(value string) {
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self.Value.Value = value
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}
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// Expands a file path
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// 1. replace tilde with users home dir
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// 2. expands embedded environment variables
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// 3. cleans the path, e.g. /a/b/../c -> /a/c
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// Note, it has limitations, e.g. ~someuser/tmp will not be expanded
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func expandPath(p string) string {
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if strings.HasPrefix(p, "~/") || strings.HasPrefix(p, "~\\") {
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if user, err := user.Current(); err == nil {
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if err == nil {
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p = strings.Replace(p, "~", user.HomeDir, 1)
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}
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}
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}
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return filepath.Clean(os.ExpandEnv(p))
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}
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