Add show to TBLogger object (JuliaLogging#31)

Add pretty-printing to `TBLogger` object

Author: PhilipVinc

src/TBLogger.jl

@@ -231,3 +231,21 @@ function handle_message(lg::TBLogger, level, message, _module, group, id, file,
     iter = increment_step!(lg, i_step)
     write_event(lg.file, make_event(lg, summ, step=iter))
 end
+
+######################### Methods for pretty printing ##########################
+Base.show(io::IO, tbl::TBLogger) = begin
+	str  = "TBLogger(\"$(tbl.logdir)\"), min_level=$(tbl.min_level), "*
+		   "purge_step=$(tbl.global_step))"
+    Base.print(io, str)
+end
+
+Base.show(io::IO, mime::MIME"text/plain", tbl::TBLogger) = begin
+	str = """
+	TBLogger:
+		- Log level     : $(tbl.min_level)
+		- Current step  : $(tbl.global_step)
+		- Output        : $(tbl.logdir)
+		- open files    : $(length(tbl.all_files))
+	"""
+    Base.print(io, str)
+end