Only replace '~' with home if at start of path

Ref #757

cmd/micro/util.go

@@ -12,6 +12,7 @@ import (
 	"unicode/utf8"
 
 	"github.com/mattn/go-runewidth"
+	homedir "github.com/mitchellh/go-homedir"
 )
 
 // Util.go is a collection of utility functions that are used throughout
@@ -363,3 +364,18 @@ func JoinCommandArgs(args ...string) string {
 
 	return buf.String()
 }
+
+// ReplaceHome takes a path as input and replaces ~ at the start of the path with the user's
+// home directory. Does nothing if the path does not start with '~'.
+func ReplaceHome(path string) string {
+	if !strings.HasPrefix(path, "~") {
+		return path
+	}
+
+	home, err := homedir.Dir()
+	if err != nil {
+		messenger.Error("Could not find home directory: ", err)
+		return path
+	}
+	return strings.Replace(path, "~", home, 1)
+}