add show methods (#3)

Author: bicycle1885

src/CodecZstd.jl

@@ -12,7 +12,9 @@ import TranscodingStreams:
     TranscodingStreams,
     TranscodingStream,
     Memory,
-    Error
+    Error,
+    initialize,
+    finalize
 
 include("libzstd.jl")
 include("compression.jl")

src/compression.jl

@@ -6,6 +6,10 @@ struct ZstdCompression <: TranscodingStreams.Codec
     level::Int
 end
 
+function Base.show(io::IO, codec::ZstdCompression)
+    print(io, summary(codec), "(level=$(codec.level))")
+end
+
 # Same as the zstd command line tool (v1.2.0).
 const DEFAULT_COMPRESSION_LEVEL = 3
 

src/decompression.jl

@@ -5,6 +5,10 @@ struct ZstdDecompression <: TranscodingStreams.Codec
     dstream::DStream
 end
 
+function Base.show(io::IO, codec::ZstdDecompression)
+    print(io, summary(codec), "()")
+end
+
 """
     ZstdDecompression()
 

test/runtests.jl

@@ -3,6 +3,18 @@ using Base.Test
 import TranscodingStreams
 
 @testset "Zstd Codec" begin
+    codec = ZstdCompression()
+    @test codec isa ZstdCompression
+    @test ismatch(r"^CodecZstd.ZstdCompression\(level=\d+\)$", sprint(show, codec))
+    @test CodecZstd.initialize(codec) === nothing
+    @test CodecZstd.finalize(codec) === nothing
+
+    codec = ZstdDecompression()
+    @test codec isa ZstdDecompression
+    @test ismatch(r"^CodecZstd.ZstdDecompression\(\)$", sprint(show, codec))
+    @test CodecZstd.initialize(codec) === nothing
+    @test CodecZstd.finalize(codec) === nothing
+
     data = [0x28, 0xb5, 0x2f, 0xfd, 0x04, 0x50, 0x19, 0x00, 0x00, 0x66, 0x6f, 0x6f, 0x3f, 0xba, 0xc4, 0x59]
     @test read(ZstdDecompressionStream(IOBuffer(data))) == b"foo"
     @test read(ZstdDecompressionStream(IOBuffer(vcat(data, data)))) == b"foofoo"