1 files changed, 86 insertions, 0 deletions
diff --git a/klm/util/stream/multi_progress.cc b/klm/util/stream/multi_progress.cc
new file mode 100644
index 00000000..8ba10386
--- /dev/null
+++ b/klm/util/stream/multi_progress.cc
@@ -0,0 +1,86 @@
+#include "util/stream/multi_progress.hh"
+
+// TODO: merge some functionality with the simple progress bar?
+#include "util/ersatz_progress.hh"
+
+#include <iostream>
+#include <limits>
+
+#include <string.h>
+
+#if !defined(_WIN32) && !defined(_WIN64)
+#include <unistd.h>
+#endif
+
+namespace util { namespace stream {
+
+namespace {
+const char kDisplayCharacters[] = "-+*#0123456789";
+
+uint64_t Next(unsigned char stone, uint64_t complete) {
+  return (static_cast<uint64_t>(stone + 1) * complete + MultiProgress::kWidth - 1) / MultiProgress::kWidth;
+}
+
+} // namespace
+
+MultiProgress::MultiProgress() : active_(false), complete_(std::numeric_limits<uint64_t>::max()), character_handout_(0) {}
+
+MultiProgress::~MultiProgress() {
+  if (active_ && complete_ != std::numeric_limits<uint64_t>::max())
+    std::cerr << '\n';
+}
+
+void MultiProgress::Activate() {
+  active_ = 
+#if !defined(_WIN32) && !defined(_WIN64)
+    // Is stderr a terminal?  
+    (isatty(2) == 1)
+#else
+    true
+#endif
+    ;
+}
+
+void MultiProgress::SetTarget(uint64_t complete) {
+  if (!active_) return;
+  complete_ = complete;
+  if (!complete) complete_ = 1;
+  memset(display_, 0, sizeof(display_));
+  character_handout_ = 0;
+  std::cerr << kProgressBanner;
+}
+
+WorkerProgress MultiProgress::Add() {
+  if (!active_)
+    return WorkerProgress(std::numeric_limits<uint64_t>::max(), *this, '\0');
+  std::size_t character_index;
+  {
+    boost::unique_lock<boost::mutex> lock(mutex_);
+    character_index = character_handout_++;
+    if (character_handout_ == sizeof(kDisplayCharacters) - 1)
+      character_handout_ = 0;
+  }
+  return WorkerProgress(Next(0, complete_), *this, kDisplayCharacters[character_index]);
+}
+
+void MultiProgress::Finished() {
+  if (!active_ || complete_ == std::numeric_limits<uint64_t>::max()) return;
+  std::cerr << '\n';
+  complete_ = std::numeric_limits<uint64_t>::max();
+}
+
+void MultiProgress::Milestone(WorkerProgress &worker) {
+  if (!active_ || complete_ == std::numeric_limits<uint64_t>::max()) return;
+  unsigned char stone = std::min(static_cast<uint64_t>(kWidth), worker.current_ * kWidth / complete_);
+  for (char *i = &display_[worker.stone_]; i < &display_[stone]; ++i) {
+    *i = worker.character_;
+  }
+  worker.next_ = Next(stone, complete_);
+  worker.stone_ = stone;
+  {
+    boost::unique_lock<boost::mutex> lock(mutex_);
+    std::cerr << '\r' << display_ << std::flush;
+  }
+}
+
+}} // namespaces