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@@ -1,115 +1,118 @@
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package utils
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+
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import (
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- "path/filepath"
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- "os"
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- "strings"
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- "os/user"
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- "github.com/codegangsta/cli"
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- "flag"
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- "fmt"
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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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+
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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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+ 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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+ 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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+ 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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+ 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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+ 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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+ 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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+ 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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+ 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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+
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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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-
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- eachName(self.Name, func(name string) {
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- set.Var(self.Value, self.Name, "a: " + self.Usage)
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- })
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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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+
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+ eachName(self.Name, func(name string) {
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+ set.Var(self.Value, self.Name, "a: "+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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+ 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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+ 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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+ 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, ","), ", $"))
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- }
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- return str + envText
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+ envText := ""
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+ if envVar != "" {
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+ envText = fmt.Sprintf(" [$%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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+ 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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+ self.Value.Value = value
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}
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// Expands a file path
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@@ -118,16 +121,13 @@ func (self *DirectoryFlag) Set(value string) {
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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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-
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- return filepath.Clean(os.ExpandEnv(p))
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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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+
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+ return filepath.Clean(os.ExpandEnv(p))
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}
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-
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-
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-
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