#include "linenoise.hpp"

...

const auto path = "history.txt";

// Setup completion words every time when a user types
linenoise::SetCompletionCallback([](const char* editBuffer, std::vector<std::string>& completions) {
    if (editBuffer[0] == 'h') {
        completions.push_back("hello");
        completions.push_back("hello there");
    }
});

// Enable the multi-line mode
linenoise::SetMultiLine(true);

// Set max length of the history
linenoise::SetHistoryMaxLen(4);

// Load history
linenoise::LoadHistory(path);

while (true) {
    // Read line
    std::string line;
    auto quit = linenoise::Readline("hello> ", line);

    if (quit) {
        break;
    }

    cout <<  "echo: '" << line << "'" << endl;

    // Add text to history
    linenoise::AddHistory(line.c_str());
}

// Save history
linenoise::SaveHistory(path);

namespace linenoise;

std::string Readline(const char* prompt);

void SetMultiLine(bool multiLineMode);

typedef std::function<void (const char* editBuffer, std::vector<std::string>& completions)> CompletionCallback;

void SetCompletionCallback(CompletionCallback fn);

bool SetHistoryMaxLen(size_t len);

bool LoadHistory(const char* path);

bool SaveHistory(const char* path);

bool AddHistory(const char* line);

const std::vector<std::string>& GetHistory();