move Algorithm to file and add show

Author: lkdvos

src/MPSKit.jl

@@ -63,16 +63,7 @@ export exact_diagonalization
 export TransferMatrix
 export transfer_left, transfer_right
 
-# Abstract type defs
-"""
-$(TYPEDEF)
-
-Abstract supertype for all algorithm structs.
-These can be thought of as `NamedTuple`s that hold the settings for a given algorithm,
-which can be used for dispatch.
-Additionally, the constructors can be used to provide default values and input sanitation.
-"""
-abstract type Algorithm end
+include("algorithms/algorithm.jl")
 
 # submodules
 include("utility/dynamictols.jl")

src/algorithms/algorithm.jl

@@ -0,0 +1,22 @@
+"""
+$(TYPEDEF)
+
+Abstract supertype for all algorithm structs.
+These can be thought of as `NamedTuple`s that hold the settings for a given algorithm,
+which can be used for dispatch.
+Additionally, the constructors can be used to provide default values and input sanitation.
+"""
+abstract type Algorithm end
+
+function Base.show(io::IO, ::MIME"text/plain", alg::Algorithm)
+    if get(io, :compact, false)
+        println(io, "$typeof(alg)(...)")
+        return nothing
+    end
+    println(io, typeof(alg), ":")
+    iocompact = IOContext(io, :compact => true)
+    for f in propertynames(alg)
+        println(io, " * ", f, ": ", getproperty(alg, f))
+    end
+    return nothing
+end