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terminal.h
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/*******************************************************************************
* CLI - A simple command line interface.
* Copyright (C) 2016-2021 Daniele Pallastrelli
*
* Boost Software License - Version 1.0 - August 17th, 2003
*
* Permission is hereby granted, free of charge, to any person or organization
* obtaining a copy of the software and accompanying documentation covered by
* this license (the "Software") to use, reproduce, display, distribute,
* execute, and transmit the Software, and to prepare derivative works of the
* Software, and to permit third-parties to whom the Software is furnished to
* do so, all subject to the following:
*
* The copyright notices in the Software and this entire statement, including
* the above license grant, this restriction and the following disclaimer,
* must be included in all copies of the Software, in whole or in part, and
* all derivative works of the Software, unless such copies or derivative
* works are solely in the form of machine-executable object code generated by
* a source language processor.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
* SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
* FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
******************************************************************************/
#ifndef CLI_DETAIL_TERMINAL_H_
#define CLI_DETAIL_TERMINAL_H_
#include <string>
#include "../colorprofile.h"
#include "inputdevice.h"
namespace cli
{
namespace detail
{
enum class Symbol
{
nothing,
command,
up,
down,
tab,
eof
};
class Terminal
{
public:
explicit Terminal(std::ostream &_out) : out(_out) {}
void ResetCursor() { position = 0; }
void SetLine(const std::string &newLine)
{
out << beforeInput
<< std::string(position, '\b') << newLine
<< afterInput << std::flush;
// if newLine is shorter then currentLine, we have
// to clear the rest of the string
if (newLine.size() < currentLine.size())
{
out << std::string(currentLine.size() - newLine.size(), ' ');
// and go back
out << std::string(currentLine.size() - newLine.size(), '\b') << std::flush;
}
currentLine = newLine;
position = currentLine.size();
}
std::string GetLine() const { return currentLine; }
std::pair<Symbol, std::string> Keypressed(std::pair<KeyType, char> k)
{
switch (k.first)
{
case KeyType::eof:
return std::make_pair(Symbol::eof, std::string{});
break;
case KeyType::backspace:
{
if (position == 0)
break;
--position;
const auto pos = static_cast<std::string::difference_type>(position);
// remove the char from buffer
currentLine.erase(currentLine.begin() + pos);
// go back to the previous char
out << '\b';
// output the rest of the line
out << std::string(currentLine.begin() + pos, currentLine.end());
// remove last char
out << ' ';
// go back to the original position
out << std::string(currentLine.size() - position + 1, '\b') << std::flush;
break;
}
case KeyType::up:
return std::make_pair(Symbol::up, std::string{});
break;
case KeyType::down:
return std::make_pair(Symbol::down, std::string{});
break;
case KeyType::left:
if (position > 0)
{
out << '\b' << std::flush;
--position;
}
break;
case KeyType::right:
if (position < currentLine.size())
{
out << beforeInput
<< currentLine[position]
<< afterInput << std::flush;
++position;
}
break;
case KeyType::ret:
{
out << "\r\n";
auto cmd = currentLine;
currentLine.clear();
position = 0;
return std::make_pair(Symbol::command, cmd);
}
break;
case KeyType::ascii:
{
const char c = static_cast<char>(k.second);
if (c == '\t')
return std::make_pair(Symbol::tab, std::string());
else
{
const auto pos = static_cast<std::string::difference_type>(position);
// output the new char:
out << beforeInput << c;
// and the rest of the string:
out << std::string(currentLine.begin() + pos, currentLine.end())
<< afterInput;
// go back to the original position
out << std::string(currentLine.size() - position, '\b') << std::flush;
// update the buffer and cursor position:
currentLine.insert(currentLine.begin() + pos, c);
++position;
}
break;
}
case KeyType::canc:
{
if (position == currentLine.size())
break;
const auto pos = static_cast<std::string::difference_type>(position);
// output the rest of the line
out << std::string(currentLine.begin() + pos + 1, currentLine.end());
// remove last char
out << ' ';
// go back to the original position
out << std::string(currentLine.size() - position, '\b') << std::flush;
// remove the char from buffer
currentLine.erase(currentLine.begin() + pos);
break;
}
case KeyType::end:
{
const auto pos = static_cast<std::string::difference_type>(position);
out << beforeInput
<< std::string(currentLine.begin() + pos, currentLine.end())
<< afterInput << std::flush;
position = currentLine.size();
break;
}
case KeyType::home:
{
out << std::string(position, '\b') << std::flush;
position = 0;
break;
}
case KeyType::ignored:
// TODO
break;
}
return std::make_pair(Symbol::nothing, std::string());
}
private:
std::string currentLine;
std::size_t position = 0; // next writing position in currentLine
std::ostream &out;
};
} // namespace detail
} // namespace cli
#endif // CLI_DETAIL_TERMINAL_H_