[thin_restore] Add a progress monitor

base/progress_monitor.cc

@@ -0,0 +1,75 @@
+#include "base/progress_monitor.h"
+
+#include <iostream>
+
+//----------------------------------------------------------------
+
+namespace {
+	using namespace std;
+
+	class progress_bar : public base::progress_monitor {
+	public:
+		progress_bar(string const &title)
+			: title_(title),
+			  progress_width_(50),
+			  spinner_(0) {
+
+			update_percent(0);
+		}
+
+		void update_percent(unsigned p) {
+			unsigned nr_equals = max<unsigned>(progress_width_ * p / 100, 1);
+			unsigned nr_spaces = progress_width_ - nr_equals;
+
+			cout << title_ << ": [";
+
+			for (unsigned i = 0; i < nr_equals - 1; i++)
+				cout << '=';
+
+			if (nr_equals < progress_width_)
+				cout << '>';
+
+			for (unsigned i = 0; i < nr_spaces; i++)
+				cout << ' ';
+
+			cout << "] " << spinner_char() << " " << p << "%\r" << flush;
+
+			spinner_++;
+		}
+
+	private:
+		char spinner_char() const {
+			char cs[] = {'|', '/', '-', '\\'};
+
+			unsigned index = spinner_ % sizeof(cs);
+			return cs[index];
+		}
+
+		std::string title_;
+		unsigned progress_width_;
+		unsigned spinner_;
+	};
+
+	class quiet_progress : public base::progress_monitor {
+	public:
+		void update_percent(unsigned p) {
+		}
+	};
+
+}
+
+//----------------------------------------------------------------
+
+base::progress_monitor::ptr
+base::create_progress_bar(std::string const &title)
+{
+	return progress_monitor::ptr(new progress_bar(title));
+}
+
+base::progress_monitor::ptr
+base::create_quiet_progress_monitor()
+{
+	return progress_monitor::ptr(new quiet_progress());
+}
+
+//----------------------------------------------------------------