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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include <algorithm>
#include <iomanip>
namespace mongo {
/**
* A tool to shape data into a table. Input may be any iterable type T of another
* iterable type U of a string-like type S, for example, a vector of vectors of
* std::strings. Type S must support an ostream overload and a size() method.
*
* Example usage:
* std::vector<std::vector<std::string>> rows;
*
* rows.push_back({ "X_VALUE", "Y_VALUE" });
* rows.push_back({ "0", "0" });
* rows.push_back({ "10.3", "0" });
* rows.push_back({ "-0.5", "2" });
*
* std::cout << toTable(rows) << std::endl;
*/
template <typename T>
std::string toTable(const T& rows) {
const int kDefaultColumnSpacing = 3;
std::vector<std::size_t> widths;
for (auto&& row : rows) {
size_t i = 0;
for (auto&& value : row) {
widths.resize(std::max(widths.size(), i + 1));
widths[i] = std::max(widths[i], value.size());
i++;
}
}
std::stringstream ss;
ss << std::left;
for (auto&& row : rows) {
size_t i = 0;
for (auto&& value : row) {
ss << std::setw(widths[i++] + kDefaultColumnSpacing);
ss << value;
}
ss << "\n";
}
return ss.str();
}
} // namespace mongo
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