add a progress bar to display some long task status

progressBar.cpp

@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2019 Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "progressBar.hpp"
+
+ProgressBar::ProgressBar(std::string mess, int maxValue, int progressLen):
+		_mess(mess), _maxValue(maxValue), _progressLen(progressLen)
+{
+}
+
+void ProgressBar::display(int value)
+{
+	float percent = ((float)value * 100.0f)/(float)_maxValue;
+	float nbEq = (percent * (float) _progressLen)/100.0f;
+
+	fprintf(stderr, "\r%s: [", _mess.c_str());
+	for (int z=0; z < nbEq; z++) {
+		fputc('=', stderr);
+	}
+	fprintf(stderr, "%*s", (int)(_progressLen-nbEq), "");
+	fprintf(stderr, "] %3.2f%%", percent);
+}
+void ProgressBar::done()
+{
+	display(_maxValue);
+	fprintf(stderr, "\nDone\n");
+}

progressBar.hpp

@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2019 Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef PROGRESSBARE_HPP
+#define PROGRESSBARE_HPP
+
+#include <iostream>
+
+class ProgressBar {
+	public:
+		ProgressBar(std::string mess, int maxValue, int progressLen);
+		void display(int value);
+		void done();
+	private:
+		std::string _mess;
+		int _maxValue;
+		int _progressLen;
+};
+
+#endif