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diff --git a/src/unique_path.cc b/src/unique_path.cc
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+/**
+ * Copyright (c) 2020, 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.
+ */
+
+#include "unique_path.hh"
+
+#include "config.h"
+
+void
+unique_path_generator::add_source(
+ const std::shared_ptr<unique_path_source>& path_source)
+{
+ ghc::filesystem::path path = path_source->get_path();
+
+ path_source->set_unique_path(path.filename());
+ path_source->set_path_prefix(path.parent_path());
+ this->upg_unique_paths[path.filename()].push_back(path_source);
+}
+
+void
+unique_path_generator::generate()
+{
+ int loop_count = 0;
+
+ while (!this->upg_unique_paths.empty()) {
+ std::vector<std::shared_ptr<unique_path_source>> collisions;
+
+ for (const auto& pair : this->upg_unique_paths) {
+ if (pair.second.size() == 1) {
+ if (loop_count > 0) {
+ std::shared_ptr<unique_path_source> src = pair.second[0];
+
+ src->set_unique_path("[" + src->get_unique_path());
+ }
+
+ this->upg_max_len
+ = std::max(this->upg_max_len,
+ pair.second[0]->get_unique_path().size());
+ } else {
+ bool all_common = true;
+
+ do {
+ std::string common;
+
+ for (auto& src : pair.second) {
+ auto& path = src->get_path_prefix();
+
+ if (common.empty()) {
+ common = path.filename();
+ if (common.empty()) {
+ all_common = false;
+ }
+ } else if (common != path.filename()) {
+ all_common = false;
+ }
+ }
+
+ if (all_common) {
+ for (auto& src : pair.second) {
+ auto& path = src->get_path_prefix();
+ auto par = path.parent_path();
+
+ if (path.empty() || path == par) {
+ all_common = false;
+ } else {
+ src->set_path_prefix(path.parent_path());
+ }
+ }
+ }
+ } while (all_common);
+
+ collisions.insert(
+ collisions.end(), pair.second.begin(), pair.second.end());
+ }
+ }
+
+ this->upg_unique_paths.clear();
+
+ for (auto& src : collisions) {
+ const auto unique_path = src->get_unique_path();
+ auto& prefix = src->get_path_prefix();
+
+ if (loop_count == 0) {
+ src->set_unique_path(prefix.filename().string() + "]/"
+ + unique_path);
+ } else {
+ src->set_unique_path(prefix.filename().string() + "/"
+ + unique_path);
+ }
+
+ ghc::filesystem::path parent = prefix.parent_path();
+
+ src->set_path_prefix(parent);
+
+ if (parent.empty() || parent == prefix) {
+ src->set_unique_path("[" + src->get_unique_path());
+ } else {
+ this->upg_unique_paths[src->get_unique_path()].push_back(src);
+ }
+ }
+
+ loop_count += 1;
+ }
+}