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#pragma once
/// @file
#include "finally.hh"
#include "types.hh"
#include <functional>
#include <string>
namespace nix {
namespace detail {
/** Provides the completion hooks for the repl, without exposing its complete
* internals. */
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;
/** Returns a boolean of whether the interacter got EOF */
virtual bool getLine(std::string & input, ReplPromptType promptType) = 0;
virtual ~ReplInteracter(){};
};
class ReadlineLikeInteracter : public virtual 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;
/** Writes the current history to the history file.
*
* This function logs but ignores errors from readline's write_history().
*/
virtual void writeHistory();
virtual ~ReadlineLikeInteracter() override;
};
class AutomationInteracter : public virtual ReplInteracter
{
public:
AutomationInteracter() = default;
virtual Guard init(detail::ReplCompleterMixin * repl) override;
virtual bool getLine(std::string & input, ReplPromptType promptType) override;
virtual ~AutomationInteracter() override = default;
};
};
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