Added various constructors

Author: cmaglie

constructors.go

@@ -0,0 +1,32 @@
+package paths
+
+import (
+	"io/ioutil"
+	"os"
+	"runtime"
+)
+
+// NullPath return the path to the /dev/null equivalent for the current OS
+func NullPath() *Path {
+	if runtime.GOOS == "windows" {
+		return New("nul")
+	}
+	return New("/dev/null")
+}
+
+// TempDir returns the default path to use for temporary files
+func TempDir() *Path {
+	return New(os.TempDir())
+}
+
+// MkTempDir creates a new temporary directory in the directory
+// dir with a name beginning with prefix and returns the path of
+// the new directory. If dir is the empty string, TempDir uses the
+// default directory for temporary files
+func MkTempDir(dir, prefix string) (*Path, error) {
+	path, err := ioutil.TempDir(dir, prefix)
+	if err != nil {
+		return nil, err
+	}
+	return New(path), nil
+}