repl-interacter.hh

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#pragma once
 
#include "lix/libutil/finally.hh"
#include "lix/libutil/types.hh"
#include <functional>
#include <string>
 
namespace nix {
 
namespace detail {
struct ReplCompleterMixin {
    virtual StringSet completePrefix(const std::string & prefix) = 0;
};
};
 
enum class ReplPromptType {
    ReplPrompt,
    ContinuationPrompt,
};
 
class ReplInteracter
{
public:
    using Guard = Finally<std::function<void()>>;
 
    virtual Guard init(detail::ReplCompleterMixin * repl) = 0;
    virtual bool getLine(std::string & input, ReplPromptType promptType) = 0;
    virtual ~ReplInteracter(){};
};
 
class ReadlineLikeInteracter final : public ReplInteracter
{
    std::string historyFile;
public:
    ReadlineLikeInteracter(std::string historyFile)
        : historyFile(historyFile)
    {
    }
    virtual Guard init(detail::ReplCompleterMixin * repl) override;
    virtual bool getLine(std::string & input, ReplPromptType promptType) override;
    virtual void writeHistory();
    virtual ~ReadlineLikeInteracter() override;
};
 
class AutomationInteracter final : public ReplInteracter
{
public:
    AutomationInteracter() = default;
    virtual Guard init(detail::ReplCompleterMixin * repl) override;
    virtual bool getLine(std::string & input, ReplPromptType promptType) override;
    virtual ~AutomationInteracter() override = default;
};
 
};