Commits on May 10, 2021

1. Add zapfilter …

   This utility allows creating a logger with "advanced" filters like in the following example.
   It is particularly convenient to use with a CLI flag package or using environment variables.
   
   	core := zap.NewExample().Core()
   	// *=myns             => any level, myns namespace
       // info,warn:myns.*   => info or warn level, any namespace matching myns.*
   	// error=*            => everything with error level
   	logger := zap.New(zapfilter.NewFilteringCore(core, zapfilter.MustParseRules("*:myns info,warn:myns.* error:*")))
   	defer logger.Sync()
   
   	logger.Debug("top debug")                                 // no match
   	logger.Named("myns").Debug("myns debug")                  // matches *:myns
   	logger.Named("bar").Debug("bar debug")                    // no match
   	logger.Named("myns").Named("foo").Debug("myns.foo debug") // no match
   
   	logger.Info("top info")                                 // no match
   	logger.Named("myns").Info("myns info")                  // matches *:myns
   	logger.Named("bar").Info("bar info")                    // no match
   	logger.Named("myns").Named("foo").Info("myns.foo info") // matches info,warn:myns.*
   
   	logger.Warn("top warn")                                 // no match
   	logger.Named("myns").Warn("myns warn")                  // matches *:myns
   	logger.Named("bar").Warn("bar warn")                    // no match
   	logger.Named("myns").Named("foo").Warn("myns.foo warn") // matches info,warn:myns.*
   
   	logger.Error("top error")                                 // matches error:*
   	logger.Named("myns").Error("myns error")                  // matches *:myns and error:*
   	logger.Named("bar").Error("bar error")                    // matches error:*
   	logger.Named("myns").Named("foo").Error("myns.foo error") // matches error:*
   
   	// Output:
   	// {"level":"debug","logger":"myns","msg":"myns debug"}
   	// {"level":"info","logger":"myns","msg":"myns info"}
   	// {"level":"info","logger":"myns.foo","msg":"myns.foo info"}
   	// {"level":"warn","logger":"myns","msg":"myns warn"}
   	// {"level":"warn","logger":"myns.foo","msg":"myns.foo warn"}
   	// {"level":"error","msg":"top error"}
   	// {"level":"error","logger":"myns","msg":"myns error"}
   	// {"level":"error","logger":"bar","msg":"bar error"}
   	// {"level":"error","logger":"myns.foo","msg":"myns.foo error"}

   

   moul committed May 10, 2021
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