ac89bb064a
All OS and IO operations should be moved out, leaving only some misc portable pure functions. This is useful to avoid copious CPP when doing things like Windows and Emscripten ports. Newly exposed functions to break cycles: - `restoreSignals` - `updateWindowSize`
42 lines
720 B
C++
42 lines
720 B
C++
#pragma once
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/**
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* @file
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*
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* Utilities for working with the current process's environment
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* variables.
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*/
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#include <optional>
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#include "types.hh"
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namespace nix {
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/**
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* @return an environment variable.
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*/
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std::optional<std::string> getEnv(const std::string & key);
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/**
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* @return a non empty environment variable. Returns nullopt if the env
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* variable is set to ""
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*/
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std::optional<std::string> getEnvNonEmpty(const std::string & key);
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/**
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* Get the entire environment.
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*/
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std::map<std::string, std::string> getEnv();
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/**
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* Clear the environment.
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*/
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void clearEnv();
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/**
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* Replace the entire environment with the given one.
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*/
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void replaceEnv(const std::map<std::string, std::string> & newEnv);
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}
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