Implementation of progress bar.

src/progress_bar.cpp

@@ -0,0 +1,52 @@
+
+#include "openmc/progress_bar.h"
+
+#include <sstream>
+#include <iostream>
+#include <iomanip>
+
+#define BAR_WIDTH 72
+
+ProgressBar::ProgressBar() {
+  //  bar = "???% |                                                                |";
+
+  set_value(0.0);
+}
+
+void
+ProgressBar::set_value(double val) {
+  // set the bar percentage
+  if (val >= 100.0) {
+    bar.append("100");
+  } else if (val <= 0.0) {
+    bar.append("  0");
+  } else {
+    std::stringstream ss;
+    ss << std::setfill(' ') << std::setw(3) << (int)val;
+    bar.append(ss.str());
+  }
+
+  bar.append("% |");
+
+  // remaining width of the bar
+  int remain = BAR_WIDTH - bar.size() - 1;
+  
+  // set the bar width
+  if (val >= 100.0) {
+    bar.append(remain, '=');
+  } else {
+    int width = (int)(65*val/100);
+    std::cout << "Setting width: " << width;
+    bar.append(width, '=');
+    bar.append(1, '>');
+    bar.append(remain-width-1, ' ');
+  }
+
+  bar.append("|");
+  
+  // write the bar
+  std::cout << '\r' << bar << std::flush;
+
+  // reset the bar value
+  bar = ""; //???% |                                                                |";
+}