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Update README.md (#2732)

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@ -3,7 +3,7 @@
Very fast, header-only/compiled, C++ logging library. [![ci](https://github.com/gabime/spdlog/actions/workflows/ci.yml/badge.svg)](https://github.com/gabime/spdlog/actions/workflows/ci.yml)  [![Build status](https://ci.appveyor.com/api/projects/status/d2jnxclg20vd0o50?svg=true&branch=v1.x)](https://ci.appveyor.com/project/gabime/spdlog) [![Release](https://img.shields.io/github/release/gabime/spdlog.svg)](https://github.com/gabime/spdlog/releases/latest)
## Install
#### Header only version
#### Header-only version
Copy the include [folder](https://github.com/gabime/spdlog/tree/v1.x/include/spdlog) to your build tree and use a C++11 compiler.
#### Compiled version (recommended - much faster compile times)
@ -39,7 +39,7 @@ $ cmake .. && make -j
## Features
* Very fast (see [benchmarks](#benchmarks) below).
* Headers only or compiled
* Feature rich formatting, using the excellent [fmt](https://github.com/fmtlib/fmt) library.
* Feature-rich formatting, using the excellent [fmt](https://github.com/fmtlib/fmt) library.
* Asynchronous mode (optional)
* [Custom](https://github.com/gabime/spdlog/wiki/3.-Custom-formatting) formatting.
* Multi/Single threaded loggers.
@ -51,9 +51,9 @@ $ cmake .. && make -j
* Windows event log.
* Windows debugger (```OutputDebugString(..)```).
* Easily [extendable](https://github.com/gabime/spdlog/wiki/4.-Sinks#implementing-your-own-sink) with custom log targets.
* Log filtering - log levels can be modified in runtime as well as in compile time.
* Support for loading log levels from argv or from environment var.
* [Backtrace](#backtrace-support) support - store debug messages in a ring buffer and display later on demand.
* Log filtering - log levels can be modified at runtime as well as compile time.
* Support for loading log levels from argv or environment var.
* [Backtrace](#backtrace-support) support - store debug messages in a ring buffer and display them later on demand.
## Usage samples
@ -92,7 +92,7 @@ int main()
#include "spdlog/sinks/stdout_color_sinks.h"
void stdout_example()
{
// create color multi threaded logger
// create a color multi-threaded logger
auto console = spdlog::stdout_color_mt("console");
auto err_logger = spdlog::stderr_color_mt("stderr");
spdlog::get("console")->info("loggers can be retrieved from a global registry using the spdlog::get(logger_name)");
@ -121,7 +121,7 @@ void basic_logfile_example()
#include "spdlog/sinks/rotating_file_sink.h"
void rotating_example()
{
// Create a file rotating logger with 5mb size max and 3 rotated files
// Create a file rotating logger with 5 MB size max and 3 rotated files
auto max_size = 1048576 * 5;
auto max_files = 3;
auto logger = spdlog::rotating_logger_mt("some_logger_name", "logs/rotating.txt", max_size, max_files);
@ -135,7 +135,7 @@ void rotating_example()
#include "spdlog/sinks/daily_file_sink.h"
void daily_example()
{
// Create a daily logger - a new file is created every day on 2:30am
// Create a daily logger - a new file is created every day at 2:30 am
auto logger = spdlog::daily_logger_mt("daily_logger", "logs/daily.txt", 2, 30);
}
@ -145,7 +145,7 @@ void daily_example()
#### Backtrace support
```c++
// Debug messages can be stored in a ring buffer instead of being logged immediately.
// This is useful in order to display debug logs only when really needed (e.g. when error happens).
// This is useful to display debug logs only when needed (e.g. when an error happens).
// When needed, call dump_backtrace() to dump them to your log.
spdlog::enable_backtrace(32); // Store the latest 32 messages in a buffer.
@ -154,7 +154,7 @@ for(int i = 0; i < 100; i++)
{
spdlog::debug("Backtrace message {}", i); // not logged yet..
}
// e.g. if some has error happened:
// e.g. if some error happened:
spdlog::dump_backtrace(); // log them now! show the last 32 messages
// or my_logger->dump_backtrace(32)..
```
@ -163,7 +163,7 @@ spdlog::dump_backtrace(); // log them now! show the last 32 messages
#### Periodic flush
```c++
// periodically flush all *registered* loggers every 3 seconds:
// warning: only use if all your loggers are thread safe ("_mt" loggers)
// warning: only use if all your loggers are thread-safe ("_mt" loggers)
spdlog::flush_every(std::chrono::seconds(3));
```
@ -191,7 +191,7 @@ void stopwatch_example()
// {:X} - print in uppercase.
// {:s} - don't separate each byte with space.
// {:p} - don't print the position on each line start.
// {:n} - don't split the output to lines.
// {:n} - don't split the output into lines.
// {:a} - show ASCII if :n is not set.
#include "spdlog/fmt/bin_to_hex.h"
@ -211,11 +211,11 @@ void binary_example()
```
---
#### Logger with multi sinks - each with different format and log level
#### Logger with multi sinks - each with a different format and log level
```c++
// create logger with 2 targets with different log levels and formats.
// the console will show only warnings or errors, while the file will log all.
// create loggers with 2 targets with different log levels and formats.
// The console will show only warnings or errors, while the file will log all.
void multi_sink_example()
{
auto console_sink = std::make_shared<spdlog::sinks::stdout_color_sink_mt>();
@ -233,10 +233,10 @@ void multi_sink_example()
```
---
#### User defined callbacks about log events
#### User-defined callbacks about log events
```c++
// create logger with a lambda function callback, the callback will be called
// create a logger with a lambda function callback, the callback will be called
// each time something is logged to the logger
void callback_example()
{
@ -287,7 +287,7 @@ void multi_sink_example2()
```
---
#### User defined types
#### User-defined types
```c++
template<>
struct fmt::formatter<my_type> : fmt::formatter<std::string>
@ -306,7 +306,7 @@ void user_defined_example()
```
---
#### User defined flags in the log pattern
#### User-defined flags in the log pattern
```c++
// Log patterns can contain custom flags.
// the following example will add new flag '%*' - which will be bound to a <my_formatter_flag> instance.
@ -371,14 +371,14 @@ void android_example()
```
---
#### Load log levels from env variable or from argv
#### Load log levels from the env variable or argv
```c++
#include "spdlog/cfg/env.h"
int main (int argc, char *argv[])
{
spdlog::cfg::load_env_levels();
// or from command line:
// or from the command line:
// ./example SPDLOG_LEVEL=info,mylogger=trace
// #include "spdlog/cfg/argv.h" // for loading levels from argv
// spdlog::cfg::load_argv_levels(argc, argv);
@ -395,8 +395,8 @@ $ ./example
---
#### Log file open/close event handlers
```c++
// You can get callbacks from spdlog before/after log file has been opened or closed.
// This is useful for cleanup procedures or for adding something the start/end of the log files.
// You can get callbacks from spdlog before/after a log file has been opened or closed.
// This is useful for cleanup procedures or for adding something to the start/end of the log file.
void file_events_example()
{
// pass the spdlog::file_event_handlers to file sinks for open/close log file notifications