refactor: new string splitting implementation

CMakeLists.txt

@@ -1072,7 +1072,7 @@ foreach(tgt dwarfs_common dwarfs_reader dwarfs_writer dwarfs_extractor dwarfs_to
   set_target_properties(${tgt} PROPERTIES EXPORT_COMPILE_COMMANDS ON)
 
   target_link_libraries(${tgt} PUBLIC Boost::boost)
-  target_link_libraries(${tgt} PRIVATE dwarfs_folly_lite dwarfs_thrift_lite)
+  target_link_libraries(${tgt} PRIVATE dwarfs_folly_lite dwarfs_thrift_lite range-v3::range-v3)
 
   if(USE_JEMALLOC)
     target_link_libraries(${tgt} PRIVATE PkgConfig::JEMALLOC)

include/dwarfs/string.h

@@ -0,0 +1,73 @@
+/* vim:set ts=2 sw=2 sts=2 et: */
+/**
+ * \author     Marcus Holland-Moritz (github@mhxnet.de)
+ * \copyright  Copyright (c) Marcus Holland-Moritz
+ *
+ * This file is part of dwarfs.
+ *
+ * dwarfs 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * dwarfs 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 dwarfs.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <iterator>
+#include <type_traits>
+#include <utility>
+
+#include <range/v3/algorithm/copy.hpp>
+#include <range/v3/range/conversion.hpp>
+#include <range/v3/view/map.hpp>
+#include <range/v3/view/split.hpp>
+
+namespace dwarfs {
+
+template <typename T, typename Input, typename Delim>
+auto split_view(Input&& input, Delim&& delim) {
+  return std::forward<Input>(input) |
+         ranges::views::split(std::forward<Delim>(delim)) |
+         ranges::views::transform([](auto&& rng) {
+           return T(&*rng.begin(), ranges::distance(rng));
+         });
+}
+
+template <typename T, typename Delim>
+auto split_view(char const* input, Delim&& delim) {
+  return split_view<T>(std::string_view(input), std::forward<Delim>(delim));
+}
+
+template <typename R, typename Input, typename Delim>
+R split_to(Input&& input, Delim&& delim) {
+  return split_view<typename R::value_type>(std::forward<Input>(input),
+                                            std::forward<Delim>(delim)) |
+         ranges::to<R>;
+}
+
+template <typename R, typename Delim>
+R split_to(char const* input, Delim&& delim) {
+  return split_to<R>(std::string_view(input), std::forward<Delim>(delim));
+}
+
+template <typename Input, typename Delim, typename Container>
+void split_to(Input&& input, Delim&& delim, Container& container) {
+  ranges::copy(split_view<typename Container::value_type>(
+                   std::forward<Input>(input), std::forward<Delim>(delim)),
+               std::inserter(container, container.end()));
+}
+
+template <typename Delim, typename Container>
+void split_to(char const* input, Delim&& delim, Container& container) {
+  split_to(std::string_view(input), std::forward<Delim>(delim), container);
+}
+
+} // namespace dwarfs

src/dwarfs/options.cpp

@@ -26,10 +26,9 @@
 
 #include <fmt/format.h>
 
-#include <range/v3/view/split.hpp>
-
 #include <dwarfs/error.h>
 #include <dwarfs/options.h>
+#include <dwarfs/string.h>
 
 namespace dwarfs {
 
@@ -147,15 +146,13 @@ fsinfo_features fsinfo_features::for_level(int level) {
 fsinfo_features fsinfo_features::parse(std::string_view features) {
   fsinfo_features result;
 
-  for (auto const& f : features | ranges::views::split(',')) {
-    // TODO: This should be much simpler with C++23
-    std::string_view fsv(&*f.begin(), ranges::distance(f));
+  for (auto const& f : split_view<std::string_view>(features, ',')) {
     auto const it =
         std::find_if(fsinfo_feature_names.begin(), fsinfo_feature_names.end(),
-                     [&fsv](auto const& p) { return fsv == p.second; });
+                     [&f](auto const& p) { return f == p.second; });
 
     if (it == fsinfo_feature_names.end()) {
-      DWARFS_THROW(runtime_error, fmt::format("invalid feature: \"{}\"", fsv));
+      DWARFS_THROW(runtime_error, fmt::format("invalid feature: \"{}\"", f));
     }
 
     result |= it->first;

src/dwarfs_main.cpp

@@ -45,7 +45,6 @@
 
 #include <fmt/format.h>
 
-#include <folly/String.h>
 #include <folly/experimental/symbolizer/SignalHandler.h>
 #include <folly/portability/Fcntl.h>
 
@@ -95,6 +94,7 @@
 #include <dwarfs/options.h>
 #include <dwarfs/os_access.h>
 #include <dwarfs/performance_monitor.h>
+#include <dwarfs/string.h>
 #include <dwarfs/tool.h>
 #include <dwarfs/util.h>
 #include <dwarfs/version.h>
@@ -1431,9 +1431,7 @@ void load_filesystem(dwarfs_userdata& userdata) {
   std::optional<std::filesystem::path> perfmon_trace_file;
 #if DWARFS_PERFMON_ENABLED
   if (opts.perfmon_enabled_str) {
-    folly::splitTo<std::string>(
-        '+', opts.perfmon_enabled_str,
-        std::inserter(perfmon_enabled, perfmon_enabled.begin()));
+    split_to(opts.perfmon_enabled_str, '+', perfmon_enabled);
   }
   if (opts.perfmon_trace_file_str) {
     perfmon_trace_file = userdata.iol.os->canonical(std::filesystem::path(

src/dwarfsextract_main.cpp

@@ -26,8 +26,6 @@
 
 #include <boost/program_options.hpp>
 
-#include <folly/String.h>
-
 #include <dwarfs/filesystem_extractor.h>
 #include <dwarfs/filesystem_v2.h>
 #include <dwarfs/iolayer.h>
@@ -38,6 +36,7 @@
 #include <dwarfs/os_access.h>
 #include <dwarfs/performance_monitor.h>
 #include <dwarfs/program_options_helpers.h>
+#include <dwarfs/string.h>
 #include <dwarfs/tool.h>
 #include <dwarfs/util.h>
 #include <dwarfs_tool_main.h>
@@ -156,9 +155,7 @@ int dwarfsextract_main(int argc, sys_char** argv, iolayer const& iol) {
     std::optional<std::filesystem::path> perfmon_trace_file;
 #if DWARFS_PERFMON_ENABLED
     if (!perfmon_str.empty()) {
-      folly::splitTo<std::string>(
-          ',', perfmon_str,
-          std::inserter(perfmon_enabled, perfmon_enabled.begin()));
+      split_to(perfmon_str, ',', perfmon_enabled);
     }
     if (!trace_file.empty()) {
       perfmon_trace_file = iol.os->canonical(trace_file);

src/mkdwarfs_main.cpp

@@ -46,15 +46,12 @@
 #include <boost/algorithm/string/join.hpp>
 #include <boost/program_options.hpp>
 
-#include <folly/String.h>
-
 #include <fmt/format.h>
 #if FMT_VERSION >= 110000
 #include <fmt/ranges.h>
 #endif
 
 #include <range/v3/view/enumerate.hpp>
-#include <range/v3/view/map.hpp>
 
 #include <dwarfs/block_compressor.h>
 #include <dwarfs/block_compressor_parser.h>
@@ -84,6 +81,7 @@
 #include <dwarfs/scanner.h>
 #include <dwarfs/script.h>
 #include <dwarfs/segmenter_factory.h>
+#include <dwarfs/string.h>
 #include <dwarfs/terminal.h>
 #include <dwarfs/thread_pool.h>
 #include <dwarfs/tool.h>
@@ -865,10 +863,8 @@ int mkdwarfs_main(int argc, sys_char** argv, iolayer const& iol) {
         rw_opts.recompress_categories_exclude = true;
         input.remove_prefix(1);
       }
-      folly::splitTo<std::string>(
-          ',', input,
-          std::inserter(rw_opts.recompress_categories,
-                        rw_opts.recompress_categories.end()));
+      rw_opts.recompress_categories =
+          split_to<std::unordered_set<std::string>>(input, ',');
     }
   }
 
@@ -956,8 +952,8 @@ int mkdwarfs_main(int argc, sys_char** argv, iolayer const& iol) {
         chmod_str = "ug-st,=Xr";
       }
 
-      std::vector<std::string_view> chmod_exprs;
-      folly::split(',', chmod_str, chmod_exprs);
+      auto chmod_exprs =
+          split_to<std::vector<std::string_view>>(chmod_str, ',');
 
       auto mask = get_current_umask();
 
@@ -1021,8 +1017,8 @@ int mkdwarfs_main(int argc, sys_char** argv, iolayer const& iol) {
       options.pack_symlinks = true;
       options.pack_symlinks_index = false;
     } else {
-      std::vector<std::string_view> pack_opts;
-      folly::split(',', pack_metadata, pack_opts);
+      auto pack_opts =
+          split_to<std::vector<std::string_view>>(pack_metadata, ',');
       for (auto const& opt : pack_opts) {
         if (opt == "chunk_table") {
           options.pack_chunk_table = true;
@@ -1156,8 +1152,8 @@ int mkdwarfs_main(int argc, sys_char** argv, iolayer const& iol) {
   }
 
   if (!categorizer_list.value.empty()) {
-    std::vector<std::string> categorizers;
-    folly::split(',', categorizer_list.value, categorizers);
+    auto categorizers =
+        split_to<std::vector<std::string>>(categorizer_list.value, ',');
 
     options.inode.categorizer_mgr = std::make_shared<categorizer_manager>(lgr);