eldritch horrors
ac74dc3a2b
this does nothing on classes that are never used as base classes and have only a single base class of their own. all of these classes are also made final to prove that they are indeed in this category. once we need to derive any of them we can erase their `final` specifiers. Change-Id: I4bd8e50a58815227392b5a5a762fda4542d15bae
63 lines
1.6 KiB
C++
63 lines
1.6 KiB
C++
#pragma once
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/// @file
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#include "lix/libutil/finally.hh"
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#include "lix/libutil/types.hh"
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#include <functional>
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#include <string>
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namespace nix {
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namespace detail {
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/** Provides the completion hooks for the repl, without exposing its complete
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* internals. */
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struct ReplCompleterMixin {
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virtual StringSet completePrefix(const std::string & prefix) = 0;
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};
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};
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enum class ReplPromptType {
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ReplPrompt,
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ContinuationPrompt,
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};
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class ReplInteracter
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{
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public:
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using Guard = Finally<std::function<void()>>;
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virtual Guard init(detail::ReplCompleterMixin * repl) = 0;
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/** Returns a boolean of whether the interacter got EOF */
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virtual bool getLine(std::string & input, ReplPromptType promptType) = 0;
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virtual ~ReplInteracter(){};
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};
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class ReadlineLikeInteracter final : public ReplInteracter
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{
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std::string historyFile;
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public:
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ReadlineLikeInteracter(std::string historyFile)
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: historyFile(historyFile)
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{
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}
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virtual Guard init(detail::ReplCompleterMixin * repl) override;
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virtual bool getLine(std::string & input, ReplPromptType promptType) override;
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/** Writes the current history to the history file.
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*
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* This function logs but ignores errors from readline's write_history().
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*/
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virtual void writeHistory();
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virtual ~ReadlineLikeInteracter() override;
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};
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class AutomationInteracter final : public ReplInteracter
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{
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public:
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AutomationInteracter() = default;
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virtual Guard init(detail::ReplCompleterMixin * repl) override;
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virtual bool getLine(std::string & input, ReplPromptType promptType) override;
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virtual ~AutomationInteracter() override = default;
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};
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};
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