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Logging.
Stk uses a Logs.Src.t whose log functions are available in this module. Some modules also uses their own Logs.Src.t (like Textview or Textbuffer).
At load time, the environment variable STK_lOG_LEVEL is read to initialize the log level of log_src. Default is Logs.warning.
The create_src function creates a new log source whose messages are tagged with the "stk" tag. This is useful to separate Stk log messages from other log messages, as stk log messages should not be displayed in the Gui (this could cause some infinite loop). The creation of a new log source reads the corresponding environment variable to initialize the log level of the new source. For example, !create_src "stk.foo" will create a new log source and whose level will be initialized by looking at the STK_FOO_LOG_LEVEL.
Textlog module provides a Logs.reporter to dispatch messages based on the tags attached to the message.