[thin_ls, base] Factor out grid_layout

base/grid_layout.h

@@ -0,0 +1,41 @@
+#ifndef BASE_GRID_LAYOUT_H
+#define BASE_GRID_LAYOUT_H
+
+#include <boost/lexical_cast.hpp>
+#include <iosfwd>
+#include <list>
+#include <string>
+#include <vector>
+
+//----------------------------------------------------------------
+
+namespace base {
+	class grid_layout {
+	public:
+		typedef std::list<std::string> row;
+		typedef std::list<row> grid;
+
+		grid_layout();
+		void render(std::ostream &out) const;
+		void new_row();
+
+		template <typename T>
+		void field(T const &t) {
+			push_field(boost::lexical_cast<std::string>(t));
+		}
+
+	private:
+		row &current_row();
+		row const &current_row() const;
+		void push_field(std::string const &s);
+		void calc_field_widths(std::vector<unsigned> &widths) const;
+		std::string justify(unsigned width, std::string const &txt) const;
+
+		grid grid_;
+		unsigned nr_fields_;
+	};
+}
+
+//----------------------------------------------------------------
+
+#endif