switch to c++20

.idea/misc.xml

@@ -1,4 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="CMakeWorkspace" PROJECT_DIR="$PROJECT_DIR$" />
+  <component name="CidrRootsConfiguration">
+    <excludeRoots>
+      <file path="$PROJECT_DIR$/cmake-build-debug" />
+      <file path="$PROJECT_DIR$/cmake-build-relwithdebinfo" />
+      <file path="$PROJECT_DIR$/cmake-build-relwithsan" />
+    </excludeRoots>
+  </component>
 </project>

src/CMakeLists.txt

@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.18)
 
-set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 add_subdirectory(change_detectors)

src/change_detectors/srcs/ComparableFile.cpp

@@ -16,13 +16,13 @@ ComparableFile::ComparableFile(const File &file, const Repository *repo)
       contents([file, repo]() { return std::make_unique<FileBuffer>(repo, file.id); }) {}
 
 ComparableFile::ComparableFile(const std::filesystem::path &p, const std::filesystem::path &base)
-    : path(p.lexically_relative(base).u8string()), type(File::getFileType(p)), bytes(File::getFileSize(p)),
+    : path(p.lexically_relative(base).string()), type(File::getFileType(p)), bytes(File::getFileSize(p)),
       mtime(File::getFileMtime(p)),
       contents([p, path = this->path, type = this->type]() -> std::unique_ptr<std::streambuf> {
           if (type == File::Type::Normal) {
               auto fb = std::make_unique<std::filebuf>();
               fb->open(p, std::ios::in | std::ios::binary);
-              if (!fb->is_open()) throw Exception("Can't open " + p.u8string() + " for reading!");
+              if (!fb->is_open()) throw Exception("Can't open " + p.string() + " for reading!");
               return fb;
           }
 

src/commands/srcs/CommandDiff.cpp

@@ -43,7 +43,7 @@ void CommandDiff::run(Context ctx) {
     std::map<std::filesystem::path, File> files;///< Files in the first archive
     for (auto id: archiveO1.files) {
         auto file = Serialize::deserialize<File>(ctx.repo->getObject(id));
-        auto path = std::filesystem::u8path(file.name);
+        auto path = std::filesystem::path(file.name);
         if (isSubpath(ctx.repo->getConfig().getStr("prefix"), path)) files.emplace(file.getKey(), std::move(file));
     }
 
@@ -83,7 +83,7 @@ void CommandDiff::run(Context ctx) {
                     /// Exit when asked to
                     if (Signals::shouldQuit) throw Exception("Quitting");
                     auto file = Serialize::deserialize<File>(ctx.repo->getObject(id));
-                    if (isSubpath(ctx.repo->getConfig().getStr("prefix"), std::filesystem::u8path(file.name)))
+                    if (isSubpath(ctx.repo->getConfig().getStr("prefix"), std::filesystem::path(file.name)))
                         threadPool.push([&, file]() { processFile(ComparableFile{file, ctx.repo}); });
                     if (Signals::shouldQuit) break;
                 }
@@ -115,7 +115,7 @@ void CommandDiff::run(Context ctx) {
             std::map<std::filesystem::path, File> files2;///< Files in the first archive
             for (auto id: archiveO2->files) {
                 auto file = Serialize::deserialize<File>(ctx.repo->getObject(id));
-                auto path = std::filesystem::u8path(file.name);
+                auto path = std::filesystem::path(file.name);
                 if (isSubpath(ctx.repo->getConfig().getStr("prefix"), path))
                     files2.emplace(file.getKey(), std::move(file));
             }
@@ -144,5 +144,5 @@ void CommandDiff::run(Context ctx) {
     std::unique_lock finishedLock(threadPool.finishedLock);
     threadPool.finished.wait(finishedLock, [&threadPool] { return threadPool.empty(); });
     if (diffMode == "normal")
-        for (auto const &s: files) { ctx.logger->write(s.first.u8string() + " is removed\n", 0); }
+        for (auto const &s: files) { ctx.logger->write(s.first.string() + " is removed\n", 0); }
 }

src/commands/srcs/CommandRestore.cpp

@@ -24,7 +24,7 @@ CommandRestore::CommandRestore() : Command() {}
 
 void CommandRestore::run(Context ctx) {
     Object::idType archive = ctx.repo->getConfig().getInt("aid");
-    std::filesystem::path to = std::filesystem::u8path(ctx.repo->getConfig().getStr("to"));
+    std::filesystem::path to = std::filesystem::path(ctx.repo->getConfig().getStr("to"));
 
     std::atomic<unsigned long long> filesToRestoreCount = 0;
     std::atomic<unsigned long long> bytesToRestore = 0;
@@ -95,21 +95,21 @@ void CommandRestore::run(Context ctx) {
 
 std::string CommandRestore::backupRestoreFile(const File &file, const std::filesystem::path &baseDir,
                                               workerStatsFunction &callback, Context ctx) {
-    auto fullpath = baseDir / std::filesystem::u8path(file.name);
+    auto fullpath = baseDir / std::filesystem::path(file.name);
 
     std::filesystem::create_directories(fullpath.parent_path());
 
     if (file.fileType == File::Type::Directory) {
         std::filesystem::create_directory(fullpath);
         callback(0, 0, 1);
-        return fullpath.u8string();
+        return fullpath.string();
     }
     if (file.fileType == File::Type::Symlink) {
         auto dest = Serialize::deserialize<Chunk>(ctx.repo->getObject(file.chunks.at(0)));
-        std::filesystem::create_symlink(std::filesystem::u8path(std::string{dest.data.begin(), dest.data.end()}),
+        std::filesystem::create_symlink(std::filesystem::path(std::string{dest.data.begin(), dest.data.end()}),
                                         fullpath);
         callback(0, 0, 1);
-        return fullpath.u8string();
+        return fullpath.string();
     }
 
     std::ofstream ostream(fullpath, std::ios::binary | std::ios::out | std::ios::trunc);
@@ -124,5 +124,5 @@ std::string CommandRestore::backupRestoreFile(const File &file, const std::files
     }
     callback(0, 0, 1);
 
-    return fullpath.u8string();
+    return fullpath.string();
 }

src/commands/srcs/CommandRun.cpp

@@ -79,14 +79,14 @@ void CommandRun::run(Context ctx) {
                     File::getFileType(absPath) == File::Type::Normal ? std::filesystem::file_size(absPath) : 0;
             runnerStats.filesToSaveCount++;
             threadPool.push([&, relPath, absPath]() {
-                addFile(backupChunkFile(absPath, relPath.u8string(), workerCallback, ctx));
+                addFile(backupChunkFile(absPath, relPath.string(), workerCallback, ctx));
-                progress.print("Copied: " + relPath.u8string(), 1);
+                progress.print("Copied: " + relPath.string(), 1);
             });
         };
 
         /// Task to process an individual file in the backup
         std::function<void(std::filesystem::path)> processFile = [&, this](const std::filesystem::path &p) {
-            auto relPath = p.lexically_relative(from).u8string();
+            auto relPath = p.lexically_relative(from).string();
 
             if (ctx.repo->exists(Object::ObjectType::File, relPath) != 0) {
                 File repoFile = Serialize::deserialize<File>(ctx.repo->getObject(Object::ObjectType::File, relPath));
@@ -144,10 +144,10 @@ Object::idType CommandRun::backupChunkFile(const std::filesystem::path &orig, co
         ctx.repo->putObject(f);
         return f.id;
     }
-    if (!std::filesystem::is_regular_file(orig)) throw Exception(orig.u8string() + "is a special file, not saving");
+    if (!std::filesystem::is_regular_file(orig)) throw Exception(orig.string() + "is a special file, not saving");
 
     std::ifstream ifstream(orig, std::ios::in | std::ios::binary);
-    if (!ifstream) throw Exception("Couldn't open " + orig.u8string() + " for reading");
+    if (!ifstream) throw Exception("Couldn't open " + orig.string() + " for reading");
     std::unique_ptr<Chunker> chunker = ChunkerFactory::getChunker(ctx.repo->getConfig(), ifstream.rdbuf());
 
     SHA fileHash;
@@ -179,7 +179,7 @@ Object::idType CommandRun::backupChunkFile(const std::filesystem::path &orig, co
     /// We might have exited in the loop before, so we don't save an incomplete file
     if (Signals::shouldQuit) throw Exception("Quitting!");
     if (size != File::getFileSize(orig)) {
-        throw Exception("Something really bad happened or file " + orig.u8string() + " changed during backup");
+        throw Exception("Something really bad happened or file " + orig.string() + " changed during backup");
     }
     File f(ctx.repo->getId(), saveAs, size, File::getFileMtime(orig), fileHash.getHash(), fileChunks,
            File::getFileType(orig));

src/commands/srcs/CommandsCommon.cpp

@@ -18,16 +18,16 @@ void CommandsCommon::workerCallback(unsigned long long int bytesWritten, unsigne
 }
 
 bool CommandsCommon::isSubpath(const std::filesystem::path &prefix, const std::filesystem::path &p) {
-    if (prefix.u8string().size() > p.u8string().size()) return false;
+    if (prefix.string().size() > p.string().size()) return false;
-    for (int i = 0; i < prefix.u8string().size(); i++)
+    for (int i = 0; i < prefix.string().size(); i++)
-        if (p.u8string()[i] != prefix.u8string()[i]) return false;
+        if (p.string()[i] != prefix.string()[i]) return false;
     return true;
 }
 
 void CommandsCommon::processDirWithIgnore(const std::filesystem::path &dir, std::vector<std::string> ignore,
                                           const std::function<void(std::function<void()>)> &spawner,
                                           std::function<void(std::filesystem::directory_entry)> processFile) {
-    if (!std::filesystem::is_directory(dir)) throw Exception(dir.u8string() + " is not a directory!");
+    if (!std::filesystem::is_directory(dir)) throw Exception(dir.string() + " is not a directory!");
 
     /// Don't process the directory if it has a ".nobackup" file
     if (std::filesystem::exists(dir / ".nobackup")) return;
@@ -47,7 +47,7 @@ void CommandsCommon::processDirWithIgnore(const std::filesystem::path &dir, std:
         /// Don't process the entry if it matches any of the ignore rules
         if (std::any_of(ignore.begin(), ignore.end(), [dirEntry](auto pred) {
                 std::smatch m;
-                auto s = dirEntry.path().filename().u8string();
+                auto s = dirEntry.path().filename().string();
                 return std::regex_match(s, m, std::regex(pred));
             }))
             continue;

src/fuse/srcs/RepoFS.cpp

@@ -15,7 +15,7 @@
 #include "objects/Chunk.h"
 
 DirEntry *getf(std::string path) {
-    auto p = std::filesystem::relative(std::filesystem::u8path(path), "/");
+    auto p = std::filesystem::relative(std::filesystem::path(path), "/");
     DirEntry *entry = RepoFS::root.get();
     if (p != ".")
         for (auto const &subp: p) { entry = entry->children.at(subp).get(); }
@@ -142,7 +142,7 @@ void RepoFS::start(Repository *repo, std::string path) {
         auto a = Serialize::deserialize<Archive>(repo->getObject(r.second));
         for (auto const &f: a.files) {
             auto file = Serialize::deserialize<File>(repo->getObject(f));
-            auto path = std::filesystem::u8path(file.name);
+            auto path = std::filesystem::path(file.name);
             DirEntry *entry = root->children[std::to_string(a.id)].get()
                                       ? root->children[std::to_string(a.id)].get()
                                       : (root->children[std::to_string(a.id)] = std::make_unique<DirEntry>()).get();
@@ -153,7 +153,7 @@ void RepoFS::start(Repository *repo, std::string path) {
                                                     : (entry->children[subp] = std::make_unique<DirEntry>()).get();
             }
             entry->file.emplace(file);
-            entry->name = std::filesystem::u8path(file.name).filename().u8string();
+            entry->name = std::filesystem::path(file.name).filename().string();
         }
     }
 

src/repo/srcs/FileRepository.cpp

@@ -58,7 +58,7 @@ bool FileRepository::init() {
     if (exists()) throw Exception("Trying to initialize already existing repository!");
 
     if (!std::filesystem::is_directory(root) && !std::filesystem::create_directories(root))
-        throw Exception("Can't create directory " + root.u8string());
+        throw Exception("Can't create directory " + root.string());
 
     writeFile(root / "info", CheckFilter::filterWriteStatic(Serialize::serialize(config)));
 
@@ -157,23 +157,23 @@ bool FileRepository::deleteObject(const Object &obj) {
 std::vector<char> FileRepository::readFile(const std::filesystem::path &file, unsigned long long offset,
                                            unsigned long long size) const {
     if (size > absoluteMaxFileLimit)
-        throw Exception("Tried to read " + std::to_string(size) + " bytes from " + file.u8string() +
+        throw Exception("Tried to read " + std::to_string(size) + " bytes from " + file.string() +
                         " which is more than absoluteMaxFileLimit");
 
     std::ifstream ifstream(file, std::ios::binary | std::ios::in);
-    if (!ifstream.is_open()) throw Exception("Can't open file " + file.u8string() + " for reading!");
+    if (!ifstream.is_open()) throw Exception("Can't open file " + file.string() + " for reading!");
 
     std::vector<char> buf(size);
 
     if (ifstream.rdbuf()->pubseekpos(offset) == std::streampos(std::streamoff(-1)))
-        throw Exception("Unexpected end of file " + file.u8string());
+        throw Exception("Unexpected end of file " + file.string());
-    if (ifstream.rdbuf()->sgetn(buf.data(), size) != size) throw Exception("Unexpected end of file " + file.u8string());
+    if (ifstream.rdbuf()->sgetn(buf.data(), size) != size) throw Exception("Unexpected end of file " + file.string());
 
     return buf;
 }
 
 std::vector<char> FileRepository::readFile(const std::filesystem::path &file) const {
-    if (!std::filesystem::is_regular_file(file)) throw Exception("File " + file.u8string() + " is not a regular file!");
+    if (!std::filesystem::is_regular_file(file)) throw Exception("File " + file.string() + " is not a regular file!");
     auto fileSize = std::filesystem::file_size(file);
     if (fileSize == 0) return {};
     return readFile(file, 0, fileSize);
@@ -181,10 +181,10 @@ std::vector<char> FileRepository::readFile(const std::filesystem::path &file) co
 
 bool FileRepository::writeFile(const std::filesystem::path &file, const std::vector<char> &data) {
     std::ofstream ofstream(file, std::ios::binary | std::ios::trunc | std::ios::out);
-    if (!ofstream.is_open()) throw Exception("Can't open file " + file.u8string() + " for writing!");
+    if (!ofstream.is_open()) throw Exception("Can't open file " + file.string() + " for writing!");
 
     if (ofstream.rdbuf()->sputn(data.data(), data.size()) != data.size())
-        throw Exception("Couldn't write all the data for " + file.u8string());
+        throw Exception("Couldn't write all the data for " + file.string());
     return true;
 }
 

src/repo/srcs/objects/File.cpp

@@ -42,20 +42,20 @@ File::Type File::getFileType(const std::filesystem::path &p) {
     if (std::filesystem::is_symlink(p)) return Type::Symlink;
     if (std::filesystem::is_directory(p)) return Type::Directory;
     if (std::filesystem::is_regular_file(p)) return Type::Normal;
-    throw Exception("Unsupported file type! " + p.u8string());
+    throw Exception("Unsupported file type! " + p.string());
 }
 
 std::vector<char> File::getFileContents(const std::filesystem::path &p) {
     auto type = getFileType(p);
-    if (type == Type::Normal) throw Exception(p.u8string() + " is a normal file!");
+    if (type == Type::Normal) throw Exception(p.string() + " is a normal file!");
     if (type == Type::Directory) { return {}; }
     if (type == Type::Symlink) {
-        auto target = std::filesystem::read_symlink(p).u8string();
+        auto target = std::filesystem::read_symlink(p).string();
         std::vector<char> target_null_term = {target.begin(), target.end()};
         target_null_term.emplace_back('\0');
         return target_null_term;
     }
-    throw Exception("Error with file " + p.u8string());
+    throw Exception("Error with file " + p.string());
 }
 
 unsigned long long File::getFileMtime(const std::filesystem::path &p) {
@@ -65,16 +65,16 @@ unsigned long long File::getFileMtime(const std::filesystem::path &p) {
                 std::chrono::duration_cast<std::chrono::seconds>(std::filesystem::last_write_time(p).time_since_epoch())
                         .count());
     else if (type == Type::Symlink) {
-        auto path = p.u8string();
+        auto path = p.string();
         struct stat sb;
-        if (lstat(path.c_str(), &sb) != 0) throw Exception("Error reading mtime for " + p.u8string());
+        if (lstat(path.c_str(), &sb) != 0) throw Exception("Error reading mtime for " + p.string());
 #ifdef __APPLE__
         return sb.st_mtimespec.tv_sec;
 #else
         return sb.st_mtime;
 #endif
     }
-    throw Exception("Error with file " + p.u8string());
+    throw Exception("Error with file " + p.string());
 }
 
 unsigned long long File::getFileSize(const std::filesystem::path &p) {

tests/CMakeLists.txt

@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.18)
 
 # GoogleTest requires at least C++14
-set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.24.0")