pregressbar added

logging/progressbar.hpp

@@ -0,0 +1,91 @@
+//
+//  progressbar.hpp
+//
+//  Created by Joshua Moerman on 11/5/11.
+//  Copyright 2011 Vadovas. All rights reserved.
+//
+
+/*
+ A simple progressbar for the terminal (relies on \r).
+ Wrap your for loop in an extra scope with a progressbar, like this:
+ 
+ {	// extra scope
+	Progressbar p(std::cout);
+	for(i = 0; i < 1000; ++i){
+		...
+		p.show(i, 999);
+	}
+ }	// end extra scope (destructor of Progressbar will be used).
+ 
+ You can give extra information to show in the constructor:
+ Progressbar p(stream, "prefix", "Start message", " End message");
+ this will look like:
+ 
+	Start message
+	prefix [===============>               ]
+	End message
+ 
+ You may leave these things empty ("").
+ 
+ NOTE: the width of the bar (incl. prefix) is fixed ATM.
+ NOTE: pass the maximum-value to the function show, not the bound of the for-loop (this way the function also works nicely for floating types)
+ */
+
+#ifndef PROGRESSBAR_HPP
+#define PROGRESSBAR_HPP
+
+#include <iostream>
+
+struct progressbar {
+	progressbar(std::ostream & out, std::string prefix = "", std::string begin = "", std::string end = "")
+	: out(out)
+	, begin(begin)
+	, prefix(prefix)
+	, end(end)
+	{
+		if (begin != "") {
+			out << begin << "\n";
+		}
+		
+		show(0, 1, ' ');
+	}
+	
+	~progressbar(){
+		show(1, 1, '=');
+		
+		if (end != "") {
+			out << "\n" << end << "\n";
+		} else {
+			out << "\n";
+		}
+	}
+	
+	template <typename T>
+	void show(T const & progress, T const & max, char delim = '>'){
+		out << "\r";
+		
+		size_t width = 80;	// default terminal size :D
+		width -= prefix.size();
+		width -= 3;	// [, > and ]
+		
+		if (prefix != "") {
+			width -= 1;
+			out << prefix << ' ';
+		}
+		
+		double ratio = (double) progress / (double) max;
+		size_t length = width * ratio;
+		
+		std::string fill(length, '=');
+		std::string empty(width - length, ' ');
+		out << '[' << fill << delim << empty << ']';
+	}
+	
+private:
+	std::ostream & out;
+	std::string begin;
+	std::string prefix;
+	std::string end;
+};
+
+#endif	// PROGRESSBAR_HPP