spdlog/cfg/env.h

0001 // Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
0002 // Distributed under the MIT License (http://opensource.org/licenses/MIT)
0003
0004 #pragma once
0005 #include <spdlog/cfg/helpers.h>
0006 #include <spdlog/details/registry.h>
0007 #include <spdlog/details/os.h>
0008
0009 //
0010 // Init levels and patterns from env variables SPDLOG_LEVEL
0011 // Inspired from Rust's "env_logger" crate (https://crates.io/crates/env_logger).
0012 // Note - fallback to "info" level on unrecognized levels
0013 //
0014 // Examples:
0015 //
0016 // set global level to debug:
0017 // export SPDLOG_LEVEL=debug
0018 //
0019 // turn off all logging except for logger1:
0020 // export SPDLOG_LEVEL="*=off,logger1=debug"
0021 //
0022
0023 // turn off all logging except for logger1 and logger2:
0024 // export SPDLOG_LEVEL="off,logger1=debug,logger2=info"
0025
0026 namespace spdlog {
0027 namespace cfg {
0028 inline void load_env_levels()
0029 {
0030     auto env_val = details::os::getenv("SPDLOG_LEVEL");
0031     if (!env_val.empty())
0032     {
0033         helpers::load_levels(env_val);
0034     }
0035 }
0036
0037 } // namespace cfg
0038 } // namespace spdlog