1 // Copyright 2023 The Pigweed Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not 4 // use this file except in compliance with the License. You may obtain a copy of 5 // the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 12 // License for the specific language governing permissions and limitations under 13 // the License. 14 15 //! `pw_log` backend that calls [`std::println!`] to emit log messages. This 16 //! module is useful when you have an application or test running on the 17 //! development host and you want messages to be emitted to `stdout`. 18 //! 19 //! *Note*: This modules requires `std`. 20 //! 21 //! TODO: <pwbug.dev/311232605> - Document how to configure facade backends. 22 23 #[doc(hidden)] 24 pub mod __private { 25 pub use pw_log_backend_println_macro::{_pw_log_backend, _pw_logf_backend}; 26 27 use pw_log_backend_api::LogLevel; 28 log_level_tag(level: LogLevel) -> &'static str29 pub const fn log_level_tag(level: LogLevel) -> &'static str { 30 match level { 31 LogLevel::Debug => "DBG", 32 LogLevel::Info => "INF", 33 LogLevel::Warn => "WRN", 34 LogLevel::Error => "ERR", 35 LogLevel::Critical => "CRT", 36 LogLevel::Fatal => "FTL", 37 } 38 } 39 } 40 41 // Implement the `pw_log` backend API. 42 #[macro_export] 43 macro_rules! pw_log_backend { 44 ($log_level:expr, $format_string:literal $(, $args:expr)* $(,)?) => {{ 45 use $crate::__private as __pw_log_backend_crate; 46 $crate::__private::_pw_log_backend!($log_level, $format_string, $($args),*); 47 }}; 48 } 49 50 #[macro_export] 51 macro_rules! pw_logf_backend { 52 ($log_level:expr, $format_string:literal $(, $args:expr)* $(,)?) => {{ 53 use $crate::__private as __pw_log_backend_crate; 54 $crate::__private::_pw_logf_backend!($log_level, $format_string, $($args),*); 55 }}; 56 } 57