Five log levels are predefined: DEBUG, INFO, WARNING, ERROR and PANIC. The logger will only output log messages with level equal to or higher than limit specified in setup. The messages can optionally be shown in color (turned off by default).
All messages are shown with a RFC3339 timestamp.
The logger can be setup directly using Setup(). Alternatively, using SetupFromEnv(), the settings can be picked from environment variables LOG_LEVEL (should be one of the predefined levle names) and LOG_COLOR (should be "true" or "false").
The logger provides Log() function which takes a level, and a message. The convenience functions Debug(), Info(), Warning(), Error() and Panic() are also provided. There are also variants of these functions which support passing a format string and arguments instead of a single message string: Logf(), Debugf(), Infof(), Warningf(), Errorf() and Panicf().
When logging a message with a PANIC level, the logger will raise a panic with the specified message immediately after logging it.
The output by default goes to os.Stderr. This can be changed by using SetOutput(). Note that SetOutput() must be called after Setup() (or SetupFromEnv()).
Example use:
import "clog"
clog.Setup(clog.WARNING, true)
clog.Debug("hello world!")
clog.Warning("Hello")
clog.Panicf("The end is %s!", "nigh")
Copyright (C) 2014. Senko Rašić.
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