[thin_ls, base] Factor out grid_layout

base/grid_layout.cc

@@ -0,0 +1,82 @@
+#include "base/grid_layout.h"
+
+#include <stdexcept>
+
+using namespace base;
+using namespace std;
+
+//----------------------------------------------------------------
+
+grid_layout::grid_layout()
+	: nr_fields_(0)
+{
+	new_row();
+}
+
+void
+grid_layout::render(ostream &out) const
+{
+	vector<unsigned> widths;
+	calc_field_widths(widths);
+
+	grid::const_iterator row;
+	for (row = grid_.begin(); row != grid_.end(); ++row) {
+		row::const_iterator col;
+		unsigned i;
+		for (col = row->begin(), i = 0; col != row->end(); ++col, ++i)
+			out << justify(widths[i], *col) << " ";
+		out << "\n";
+	}
+}
+
+void
+grid_layout::new_row()
+{
+	grid_.push_back(row());
+}
+
+grid_layout::row const &
+grid_layout::current_row() const
+{
+	return grid_.back();
+}
+
+grid_layout::row &
+grid_layout::current_row()
+{
+	return grid_.back();
+}
+
+void
+grid_layout::push_field(string const &s)
+{
+	current_row().push_back(s);
+	nr_fields_ = max<unsigned>(nr_fields_, current_row().size());
+}
+
+void
+grid_layout::calc_field_widths(vector<unsigned> &widths) const
+{
+	widths.resize(nr_fields_, 0);
+
+	grid::const_iterator row;
+	for (row = grid_.begin(); row != grid_.end(); ++row) {
+		row::const_iterator col;
+		unsigned i;
+		for (col = row->begin(), i = 0; col != row->end(); ++col, ++i)
+			widths[i] = max<unsigned>(widths[i], col->length());
+	}
+}
+
+string
+grid_layout::justify(unsigned width, string const &txt) const
+{
+	if (txt.length() > width)
+		throw runtime_error("string field too long, internal error");
+
+	string result(width - txt.length(), ' ');
+	result += txt;
+	return result;
+}
+
+//----------------------------------------------------------------