history.cpp

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#ifndef THIRDPARTY_ESH_SHELLHISTORY_CPP_
#define THIRDPARTY_ESH_SHELLHISTORY_CPP_
 
#include <semf/communication/esh/history.h>
#include <algorithm>
 
namespace semf::esh
{
History::History(char* historyBuffer, size_t numberOfEntries, size_t lineSize)
: m_history{historyBuffer},
  m_numberOfEntries{numberOfEntries},
  m_lineSize{lineSize}
{
}
 
void History::insert(std::string_view command)
{
    if (command.empty() || m_history == nullptr)
    {
        return;
    }
    int index = m_savedCommands % m_numberOfEntries;
    std::copy_n(command.begin(), std::min(command.size(), m_lineSize - 1), m_history + index * m_lineSize);
    m_history[index * m_lineSize + std::min(command.size(), m_lineSize - 1)] = 0;
    m_index = ++m_savedCommands;
}
 
void History::handleArrowUp(char commandBuffer[])
{
    if (!(m_index < static_cast<int32_t>(m_savedCommands - m_numberOfEntries) || m_index == 0 || m_history == nullptr))
    {
        m_index--;
        int index = m_index % m_numberOfEntries;
        if (std::equal(m_history + index * m_lineSize, m_history + index * m_lineSize + m_lineSize, commandBuffer))
            return;
        std::copy(m_history + index * m_lineSize, m_history + index * m_lineSize + m_lineSize, commandBuffer);
    }
    else
    {
        commandBuffer[0] = 0;
    }
}
void History::handleArrowDown(char commandBuffer[])
{
    if (m_index == m_savedCommands || m_history == nullptr)
    {
        commandBuffer[0] = 0;
        return;
    }
 
    m_index++;
    int index = m_index % m_numberOfEntries;
    std::copy(m_history + index * m_lineSize, m_history + index * m_lineSize + m_lineSize, commandBuffer);
}
}  // namespace semf::esh
#endif /* THIRDPARTY_ESH_SHELLHISTORY_CPP_ */