这里记录一下 spdlog log 的 pattern 具体参数，官方链接见 https://github.com/gabime/spdlog/wiki/3.-Custom-formatting#pattern-flags
简单版见下表
| flag | meaning | example |
|---|---|---|
| %v | The actual text to log | "some user text" |
| %t | Thread id | "1232" |
| %P | Process id | "3456" |
| %n | Logger's name | "some logger name" |
| %l | The log level of the message | "debug", "info", etc |
| %L | Short log level of the message | "D", "I", etc |
| %a | Abbreviated weekday name | "Thu" |
| %A | Full weekday name | "Thursday" |
| %b | Abbreviated month name | "Aug" |
| %B | Full month name | "August" |
| %c | Date and time representation | "Thu Aug 23 15:35:46 2014" |
| %C | Year in 2 digits | "14" |
| %Y | Year in 4 digits | "2014" |
| %D or %x | Short MM/DD/YY date | "08/23/14" |
| %m | Month 01-12 | "11" |
| %d | Day of month 01-31 | "29" |
| %H | Hours in 24 format 00-23 | "23" |
| %I | Hours in 12 format 01-12 | "11" |
| %M | Minutes 00-59 | "59" |
| %S | Seconds 00-59 | "58" |
| %e | Millisecond part of the current second 000-999 | "678" |
| %f | Microsecond part of the current second 000000-999999 | "056789" |
| %F | Nanosecond part of the current second 000000000-999999999 | "256789123" |
| %p | AM/PM | "AM" |
| %r | 12 hour clock | "02:55:02 PM" |
| %R | 24-hour HH:MM time, equivalent to %H:%M | "23:55" |
| %T or %X | ISO 8601 time format (HH:MM:SS), equivalent to %H:%M:%S | "23:55:59" |
| %z | ISO 8601 offset from UTC in timezone ([+/-]HH:MM) | "+02:00" |
| %E | Seconds since the epoch | "1528834770" |
| %% | The % sign | "%" |
| %+ | spdlog's default format | "[2014-10-31 23:46:59.678] [mylogger] [info] Some message" |
| %^ | start color range (can be used only once) | "[mylogger] [info(green)] Some message" |
| %$ | end color range (for example %[1]%$ %v) (can be used only once) | [+++] Some message |
| %@ | Source file and line (use SPDLOG_TRACE(..), SPDLOG_INFO(...) etc. instead of spdlog::trace(...)) Same as %g:%# | /some/dir/my_file.cpp:123 |
| %s | Basename of the source file (use SPDLOG_TRACE(..), SPDLOG_INFO(...) etc.) | my_file.cpp |
| %g | Full or relative path of the source file as appears in the FILE macro (use SPDLOG_TRACE(..), SPDLOG_INFO(...) etc.) | /some/dir/my_file.cpp |
| %# | Source line (use SPDLOG_TRACE(..), SPDLOG_INFO(...) etc.) | 123 |
| %! | Source function (use SPDLOG_TRACE(..), SPDLOG_INFO(...) etc. see tweakme for pretty-print) | my_func |
| %o | Elapsed time in milliseconds since previous message | 456 |
| %i | Elapsed time in microseconds since previous message | 456 |
| %u | Elapsed time in nanoseconds since previous message | 11456 |
| %O | Elapsed time in seconds since previous message | 4 |
+++ ↩︎