// Copyright (C) 2017 xaizek <xaizek@posteo.net>
//
// This file is part of zograscope.
//
// zograscope is free software: you can redistribute it and/or modify
// it under the terms of version 3 of the GNU Affero General Public License as
// published by the Free Software Foundation.
//
// zograscope 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with zograscope. If not, see <http://www.gnu.org/licenses/>.
#ifndef ZOGRASCOPE_INTEGRATION_HPP_
#define ZOGRASCOPE_INTEGRATION_HPP_
#include <memory>
#include <string>
#include <utility>
#include <vector>
/**
* @file integration.hpp
*
* @brief Several terminal integration utilities.
*/
/**
* @brief A class that automatically spawns pager if output is large.
*
* Output must come to @c std::cout and is considered to be large when it
* doesn't fit screen height.
*/
class RedirectToPager
{
public:
class Impl;
/**
* @brief Can redirect @c std::cout until destruction.
*/
RedirectToPager();
//! No copy-constructor.
RedirectToPager(const RedirectToPager &rhs) = delete;
//! No copy-assignment.
RedirectToPager & operator=(const RedirectToPager &rhs) = delete;
/**
* @brief Restores previous state of @c std::cout.
*/
~RedirectToPager();
public:
/**
* @brief Restores previous state of @c std::cout discharging destructor.
*/
void discharge();
private:
//! Implementation details.
std::unique_ptr<Impl> impl;
};
/**
* @brief Queries whether program output is connected to terminal.
*
* @returns @c true if so, otherwise @c false.
*/
bool isOutputToTerminal();
/**
* @brief Retrieves terminal width and height in characters.
*
* @returns Pair of actual terminal width and height, or maximum possible values
* of the type.
*/
std::pair<unsigned int, unsigned int> getTerminalSize();
/**
* @brief Runs a command and captures its output.
*
* @note The parameter is taken by value to avoid casting away constness.
*
* @param cmd Program name followed by its arguments.
* @param input Input to be sent to program's standard input stream.
*
* @throws std::runtime_error On errors (including application returning non-0).
*/
std::string readCommandOutput(std::vector<std::string> cmd,
const std::string &input);
#endif // ZOGRASCOPE_INTEGRATION_HPP_
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