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diff --git a/src/shlex.resolver.hh b/src/shlex.resolver.hh
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+/**
+ * Copyright (c) 2015, Timothy Stack
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * * Neither the name of Timothy Stack nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * @file shlex.resolver.hh
+ */
+
+#ifndef lnav_shlex_resolver_hh
+#define lnav_shlex_resolver_hh
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include "base/intern_string.hh"
+#include "fmt/format.h"
+#include "mapbox/variant.hpp"
+
+struct null_value_t {};
+using scoped_value_t = mapbox::util::
+    variant<std::string, string_fragment, int64_t, double, null_value_t>;
+
+namespace fmt {
+template<>
+struct formatter<scoped_value_t> : formatter<std::string> {
+    template<typename FormatContext>
+    auto format(const scoped_value_t& sv, FormatContext& ctx) const
+    {
+        auto retval
+            = sv.match([](std::string str) { return str; },
+                       [](string_fragment sf) { return sf.to_string(); },
+                       [](null_value_t) { return std::string("<NULL>"); },
+                       [](int64_t value) { return fmt::to_string(value); },
+                       [](double value) { return fmt::to_string(value); });
+
+        return fmt::formatter<std::string>::format(retval, ctx);
+    }
+};
+}  // namespace fmt
+
+class scoped_resolver {
+public:
+    scoped_resolver(
+        std::initializer_list<std::map<std::string, scoped_value_t>*> l)
+    {
+        this->sr_stack.insert(this->sr_stack.end(), l.begin(), l.end());
+    }
+
+    using const_iterator
+        = std::map<std::string, scoped_value_t>::const_iterator;
+
+    const_iterator find(const std::string& str) const
+    {
+        const_iterator retval;
+
+        for (const auto* scope : this->sr_stack) {
+            if ((retval = scope->find(str)) != scope->end()) {
+                return retval;
+            }
+        }
+
+        return this->end();
+    }
+
+    const_iterator end() const { return this->sr_stack.back()->end(); }
+
+    std::vector<const std::map<std::string, scoped_value_t>*> sr_stack;
+};
+
+#endif