Add path expansion support for command line arguments, closes 567

cmd/utils/customflags_test.go

@@ -0,0 +1,28 @@
+package utils
+
+import (
+    "testing"
+    "os"
+    "os/user"
+)
+
+func TestPathExpansion(t *testing.T) {
+
+    user, _ := user.Current()
+
+    tests := map[string]string {
+        "/home/someuser/tmp": "/home/someuser/tmp",
+        "~/tmp": user.HomeDir + "/tmp",
+        "$DDDXXX/a/b": "/tmp/a/b",
+        "/a/b/": "/a/b",
+    }
+
+    os.Setenv("DDDXXX", "/tmp")
+
+    for test, expected := range tests {
+        got := expandPath(test)
+        if got != expected {
+            t.Errorf("test %s, got %s, expected %s\n", test, got, expected)
+        }
+    }
+}