Extract and improve code to find missing files (#1940).

[dcpomatic.git] / src / lib / find_missing.cc

diff --git a/src/lib/find_missing.cc b/src/lib/find_missing.cc
new file mode 100644 (file)
index 0000000..3d61e74
--- /dev/null
+++ b/src/lib/find_missing.cc
@@ -0,0 +1,75 @@
+/*
+    Copyright (C) 2021 Carl Hetherington <cth@carlh.net>
+
+    This file is part of DCP-o-matic.
+
+    DCP-o-matic is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    DCP-o-matic is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+
+#include "content.h"
+#include "find_missing.h"
+#include "util.h"
+#include <boost/filesystem.hpp>
+
+
+using std::map;
+using std::shared_ptr;
+using std::vector;
+
+
+typedef map<shared_ptr<Content>, vector<boost::filesystem::path>> Replacements;
+
+
+static
+void
+search (Replacements& replacement_paths, boost::filesystem::path directory, int depth = 0)
+{
+       for (auto candidate: boost::filesystem::directory_iterator(directory)) {
+               if (boost::filesystem::is_regular_file(candidate.path())) {
+                       for (auto& replacement: replacement_paths) {
+                               for (auto& path: replacement.second) {
+                                       if (!boost::filesystem::exists(path) && path.filename() == candidate.path().filename()) {
+                                               path = candidate.path();
+                                       }
+                               }
+                       }
+               } else if (boost::filesystem::is_directory(candidate.path()) && depth <= 2) {
+                       search (replacement_paths, candidate, depth + 1);
+               }
+       }
+}
+
+
+void
+dcpomatic::find_missing (vector<shared_ptr<Content>> content_to_fix, boost::filesystem::path clue)
+{
+       using namespace boost::filesystem;
+
+       Replacements replacement_paths;
+       for (auto content: content_to_fix) {
+               replacement_paths[content] = content->paths();
+       }
+
+       search (replacement_paths, is_directory(clue) ? clue : clue.parent_path());
+
+       for (auto content: content_to_fix) {
+               auto const& repl = replacement_paths[content];
+               bool const replacements_exist = std::find_if(repl.begin(), repl.end(), [](path p) { return !exists(p); }) == repl.end();
+               if (replacements_exist && simple_digest(replacement_paths[content]) == content->digest()) {
+                       content->set_paths (repl);
+               }
+       }
+}