Replace use of boost posix_time with {fmt}

Only issue is that in order to properly format fractional seconds,
we need a bleeding edge version of {fmt}.

CMakeLists.txt

@@ -120,7 +120,7 @@ if(WITH_MAN_PAGES)
 endif()
 
 if(NOT STATIC_BUILD_DO_NOT_USE)
-  find_package(fmt 8 CONFIG)
+  find_package(fmt 9.1 CONFIG)
 endif()
 
 if(STATIC_BUILD_DO_NOT_USE OR NOT fmt_FOUND)
@@ -141,7 +141,7 @@ if(STATIC_BUILD_DO_NOT_USE OR NOT fmt_FOUND)
   endif()
   set(CMAKE_PREFIX_PATH "${CMAKE_CURRENT_BINARY_DIR}/fmtlib-install;${CMAKE_PREFIX_PATH}")
   include_directories(BEFORE "${CMAKE_CURRENT_BINARY_DIR}/fmtlib-install/include")
-  find_package(fmt 8 REQUIRED CONFIG PATHS "${CMAKE_CURRENT_BINARY_DIR}/fmtlib-install" NO_DEFAULT_PATH)
+  find_package(fmt 9.1 REQUIRED CONFIG PATHS "${CMAKE_CURRENT_BINARY_DIR}/fmtlib-install" NO_DEFAULT_PATH)
 endif()
 
 list(APPEND DWARFS_BOOST_MODULES date_time filesystem program_options system)

CMakeLists.txt.fmtlib

@@ -8,7 +8,7 @@ ExternalProject_Add(
   fmtlib
   PREFIX ${CMAKE_CURRENT_BINARY_DIR}/fmtlib
   GIT_REPOSITORY https://github.com/fmtlib/fmt.git
-  GIT_TAG 8.1.1
+  GIT_TAG 80f8d34427d40ec5e7ce3b10ededc46bd4bd5759
   CMAKE_ARGS -DCMAKE_CXX_COMPILER_LAUNCHER=${CMAKE_CXX_COMPILER_LAUNCHER}
              -DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_CURRENT_BINARY_DIR}/fmtlib-install
              -DCMAKE_BUILD_TYPE=Release

include/dwarfs/logger.h

@@ -412,5 +412,6 @@ std::shared_ptr<Base> make_shared_logging_object(logger& lgr, Args&&... args) {
 }
 
 std::string get_logger_context(char const* path, int line);
+std::string get_current_time_string();
 
 } // namespace dwarfs

src/dwarfs/console_writer.cpp

@@ -24,8 +24,6 @@
 #include <locale>
 #include <sstream>
 
-#include <boost/date_time/posix_time/posix_time.hpp>
-
 #include <folly/Conv.h>
 
 #include <fmt/format.h>
@@ -71,8 +69,6 @@ console_writer::console_writer(std::ostream& os, progress_mode pg_mode,
     , color_(stream_is_fancy_terminal(os))
     , with_context_(with_context)
     , debug_progress_(is_debug_progress()) {
-  os_.imbue(std::locale(os_.getloc(),
-                        new boost::posix_time::time_facet("%H:%M:%S.%f")));
   if (threshold > level_type::INFO) {
     set_policy<debug_logger_policy>();
   } else {
@@ -96,7 +92,7 @@ void console_writer::rewind() {
 void console_writer::write(level_type level, const std::string& output,
                            char const* file, int line) {
   if (level <= threshold_) {
-    auto t = boost::posix_time::microsec_clock::local_time();
+    auto t = get_current_time_string();
     const char* prefix = "";
     const char* suffix = "";
 
@@ -248,7 +244,7 @@ void console_writer::update(const progress& p, bool last) {
         fmt::format(" ==> {0:.0f}% done, {1} blocks/{2} written", 100 * frac_,
                     p.blocks_written, size_with_unit(p.compressed_size));
     if (tmp != statebuf_) {
-      auto t = boost::posix_time::microsec_clock::local_time();
+      auto t = get_current_time_string();
       statebuf_ = tmp;
       std::lock_guard lock(mx_);
       os_ << "- " << t << statebuf_ << "\n";

src/dwarfs/logger.cpp

@@ -25,8 +25,6 @@
 #include <locale>
 #include <stdexcept>
 
-#include <boost/date_time/posix_time/posix_time.hpp>
-
 #include <folly/Conv.h>
 
 #ifndef NDEBUG
@@ -36,6 +34,7 @@
 #define DWARFS_SYMBOLIZE 0
 #endif
 
+#include <fmt/chrono.h>
 #include <fmt/format.h>
 
 #include "dwarfs/logger.h"
@@ -67,15 +66,13 @@ stream_logger::stream_logger(std::ostream& os, level_type threshold,
     : os_(os)
     , color_(stream_is_fancy_terminal(os))
     , with_context_(with_context) {
-  os_.imbue(std::locale(os_.getloc(),
-                        new boost::posix_time::time_facet("%H:%M:%S.%f")));
   set_threshold(threshold);
 }
 
 void stream_logger::write(level_type level, const std::string& output,
                           char const* file, int line) {
   if (level <= threshold_) {
-    auto t = boost::posix_time::microsec_clock::local_time();
+    auto t = get_current_time_string();
     const char* prefix = "";
     const char* suffix = "";
 
@@ -149,4 +146,10 @@ std::string get_logger_context(char const* path, int line) {
   return fmt::format("[{0}:{1}] ", base ? base + 1 : path, line);
 }
 
+std::string get_current_time_string() {
+  using namespace std::chrono;
+  auto now = floor<microseconds>(system_clock::now());
+  return fmt::format("{:%H:%M:%S}", now);
+}
+
 } // namespace dwarfs