move tilde expnasion to util.

config/config.go

@@ -2,8 +2,7 @@ package config
 
 import (
 	"os"
-	"os/user"
-	"strings"
+	u "github.com/jbenet/go-ipfs/util"
 )
 
 type Identity struct {
@@ -35,24 +34,25 @@ func LoadConfig(filename string) (*Config, error) {
 		filename = defaultConfigFilePath
 	}
 
-	// expand ~/
-	if strings.HasPrefix(filename, "~/") {
-		usr, err := user.Current()
+	// tilde expansion on config file
+	filename, err := u.TildeExpansion(filename)
 	if err != nil {
 		return nil, err
 	}
 
-		dir := usr.HomeDir + "/"
-		filename = strings.Replace(filename, "~/", dir, 1)
-	}
-
 	// if nothing is there, write first conifg file.
 	if _, err := os.Stat(filename); os.IsNotExist(err) {
 		WriteFile(filename, []byte(defaultConfigFile))
 	}
 
 	var cfg Config
-	err := ReadConfigFile(filename, &cfg)
+	err = ReadConfigFile(filename, &cfg)
+	if err != nil {
+		return nil, err
+	}
+
+	// tilde expansion on datastore path
+	cfg.Datastore.Path, err = u.TildeExpansion(cfg.Datastore.Path)
 	if err != nil {
 		return nil, err
 	}

util/util.go

@@ -4,6 +4,8 @@ import (
 	"fmt"
 	mh "github.com/jbenet/go-multihash"
 	"os"
+	"os/user"
+	"strings"
 )
 
 var Debug bool
@@ -17,6 +19,20 @@ func Hash(data []byte) (mh.Multihash, error) {
 	return mh.Sum(data, mh.SHA2_256, -1)
 }
 
+// tilde expansion
+func TildeExpansion(filename string) (string, error) {
+	if strings.HasPrefix(filename, "~/") {
+		usr, err := user.Current()
+		if err != nil {
+			return "", err
+		}
+
+		dir := usr.HomeDir + "/"
+		filename = strings.Replace(filename, "~/", dir, 1)
+	}
+	return filename, nil
+}
+
 // Shorthand printing functions.
 func PErr(format string, a ...interface{}) {
 	fmt.Fprintf(os.Stderr, format, a...)