Just use the global locale (fixes gh #156)

After all the effort of setting the global locale in `safe_main`,
we might just as well use it. Also makes the code a lot simpler.

include/dwarfs/console_writer.h

@@ -24,7 +24,6 @@
 #include <atomic>
 #include <cstddef>
 #include <iosfwd>
-#include <locale>
 #include <mutex>
 #include <string>
 
@@ -49,13 +48,10 @@ class console_writer : public logger {
 
   void update(const progress& p, bool last);
 
-  std::locale const& locale() const override { return locale_; }
-
  private:
   void rewind();
 
   std::ostream& os_;
-  std::locale locale_;
   std::mutex mx_;
   std::atomic<level_type> threshold_;
   std::string statebuf_;

include/dwarfs/logger.h

@@ -27,7 +27,6 @@
 #include <cstddef>
 #include <ctime>
 #include <iostream>
-#include <locale>
 #include <memory>
 #include <mutex>
 #include <sstream>
@@ -59,8 +58,6 @@ class logger {
   virtual void write(level_type level, const std::string& output,
                      char const* file, int line) = 0;
 
-  virtual std::locale const& locale() const = 0;
-
   const std::string& policy_name() const { return policy_name_; }
 
   template <class Policy>
@@ -88,14 +85,11 @@ class stream_logger : public logger {
   void write(level_type level, const std::string& output, char const* file,
              int line) override;
 
-  std::locale const& locale() const override { return locale_; }
-
   void set_threshold(level_type threshold);
   void set_with_context(bool with_context) { with_context_ = with_context; }
 
  private:
   std::ostream& os_;
-  std::locale locale_;
   std::mutex mx_;
   std::atomic<level_type> threshold_;
   bool const color_;
@@ -109,9 +103,7 @@ class level_logger {
       : lgr_(lgr)
       , level_(level)
       , file_(file)
-      , line_(line) {
-    oss_.imbue(lgr_.locale());
-  }
+      , line_(line) {}
 
   level_logger(level_logger const&) = delete;
 
@@ -144,7 +136,6 @@ class timed_level_logger {
       , with_cpu_(with_cpu)
       , file_(file)
       , line_(line) {
-    oss_.imbue(lgr_.locale());
     if (with_cpu) {
       cpu_start_time_ = thread_clock::now();
     }

src/dwarfs/console_writer.cpp

@@ -21,7 +21,6 @@
 
 #include <cstdlib>
 #include <cstring>
-#include <locale>
 #include <sstream>
 
 #include <folly/Conv.h>
@@ -82,7 +81,6 @@ console_writer::console_writer(std::ostream& os, progress_mode pg_mode,
                                size_t width, level_type threshold,
                                display_mode mode, bool with_context)
     : os_(os)
-    , locale_{""}
     , threshold_(threshold)
     , frac_(0.0)
     , pg_mode_(pg_mode)
@@ -183,8 +181,6 @@ void console_writer::update(const progress& p, bool last) {
 
   std::ostringstream oss;
 
-  oss.imbue(locale_);
-
   bool fancy = pg_mode_ == ASCII || pg_mode_ == UNICODE;
 
   if (last || fancy) {

src/dwarfs/logger.cpp

@@ -22,7 +22,6 @@
 #include <cstdlib>
 #include <cstring>
 #include <iterator>
-#include <locale>
 #include <stdexcept>
 
 #include <folly/Conv.h>
@@ -64,7 +63,6 @@ logger::level_type logger::parse_level(std::string_view level) {
 stream_logger::stream_logger(std::ostream& os, level_type threshold,
                              bool with_context)
     : os_(os)
-    , locale_{""}
     , color_(stream_is_fancy_terminal(os))
     , with_context_(with_context) {
   set_threshold(threshold);

src/dwarfs/metadata_v2.cpp

@@ -140,7 +140,6 @@ void analyze_frozen(std::ostream& os,
                     MappedFrozen<thrift::metadata::metadata> const& meta,
                     size_t total_size, int detail) {
   using namespace ::apache::thrift::frozen;
-  std::locale loc("");
   std::ostringstream oss;
   stream_logger lgr(oss);
 
@@ -157,8 +156,7 @@ void analyze_frozen(std::ostream& os,
 #endif
 
   auto fmt_size = [&](auto const& name, size_t count, size_t size) {
-    return fmt::format(loc,
-                       "{0:>14" DWARFS_FMT_L "} {1:.<20}{2:.>16" DWARFS_FMT_L
+    return fmt::format("{0:>14" DWARFS_FMT_L "} {1:.<20}{2:.>16" DWARFS_FMT_L
                        "} bytes {3:5.1f}% {4:5.1f} bytes/item\n",
                        count, name, size, 100.0 * size / total_size,
                        count > 0 ? static_cast<double>(size) / count : 0.0);
@@ -167,7 +165,6 @@ void analyze_frozen(std::ostream& os,
   auto fmt_detail = [&](auto const& name, size_t count, size_t size,
                         std::string num) {
     return fmt::format(
-        loc,
         "               {0:<20}{1:>16" DWARFS_FMT_L "} bytes {2:>6} "
         "{3:5.1f} bytes/item\n",
         name, size, num, count > 0 ? static_cast<double>(size) / count : 0.0);
@@ -276,8 +273,7 @@ void analyze_frozen(std::ostream& os,
   });
 
   os << "metadata memory usage:\n";
-  os << fmt::format(loc,
-                    "               {0:.<20}{1:.>16" DWARFS_FMT_L
+  os << fmt::format("               {0:.<20}{1:.>16" DWARFS_FMT_L
                     "} bytes       {2:6.1f} bytes/inode\n",
                     "total metadata", total_size,
                     static_cast<double>(total_size) / meta.inodes().size());