[FileFormats] remove show method in favor of summary (#2510)

docs/src/submodules/FileFormats/overview.md

@@ -16,56 +16,84 @@ models using [`write_to_file`](@ref) and [`read_from_file`](@ref).
 You must read and write files to a [`FileFormats.Model`](@ref) object. Specific
 the file-type by passing a [`FileFormats.FileFormat`](@ref) enum. For example:
 
-**The Conic Benchmark Format**
+### The Conic Benchmark Format
 
 ```jldoctest
 julia> model = MOI.FileFormats.Model(format = MOI.FileFormats.FORMAT_CBF)
-A Conic Benchmark Format (CBF) model
+MOI.FileFormats.CBF.Model
+├ ObjectiveSense: FEASIBILITY_SENSE
+├ ObjectiveFunctionType: MOI.ScalarAffineFunction{Float64}
+├ NumberOfVariables: 0
+└ NumberOfConstraints: 0
 ```
 
-**The LP file format**
+### The LP file format
 
 ```jldoctest
 julia> model = MOI.FileFormats.Model(format = MOI.FileFormats.FORMAT_LP)
-A .LP-file model
+MOI.FileFormats.LP.Model
+├ ObjectiveSense: FEASIBILITY_SENSE
+├ ObjectiveFunctionType: MOI.ScalarAffineFunction{Float64}
+├ NumberOfVariables: 0
+└ NumberOfConstraints: 0
 ```
 
-**The MathOptFormat file format**
+### The MathOptFormat file format
 
 ```jldoctest
 julia> model = MOI.FileFormats.Model(format = MOI.FileFormats.FORMAT_MOF)
-A MathOptFormat Model
+MOI.FileFormats.MOF.Model
+├ ObjectiveSense: FEASIBILITY_SENSE
+├ ObjectiveFunctionType: MOI.ScalarAffineFunction{Float64}
+├ NumberOfVariables: 0
+└ NumberOfConstraints: 0
 ```
 
-**The MPS file format**
+### The MPS file format
 
 ```jldoctest
 julia> model = MOI.FileFormats.Model(format = MOI.FileFormats.FORMAT_MPS)
-A Mathematical Programming System (MPS) model
+MOI.FileFormats.MPS.Model
+├ ObjectiveSense: FEASIBILITY_SENSE
+├ ObjectiveFunctionType: MOI.ScalarAffineFunction{Float64}
+├ NumberOfVariables: 0
+└ NumberOfConstraints: 0
 ```
 
-**The NL file format**
+### The NL file format
 
 ```jldoctest
 julia> model = MOI.FileFormats.Model(format = MOI.FileFormats.FORMAT_NL)
-An AMPL (.nl) model
+MOI.FileFormats.NL.Model
+├ ObjectiveSense: unknown
+├ ObjectiveFunctionType: unknown
+├ NumberOfVariables: unknown
+└ NumberOfConstraints: unknown
 ```
 
-**The REW file format**
+### The REW file format
 
 ```jldoctest
 julia> model = MOI.FileFormats.Model(format = MOI.FileFormats.FORMAT_REW)
-A Mathematical Programming System (MPS) model
+MOI.FileFormats.MPS.Model
+├ ObjectiveSense: FEASIBILITY_SENSE
+├ ObjectiveFunctionType: MOI.ScalarAffineFunction{Float64}
+├ NumberOfVariables: 0
+└ NumberOfConstraints: 0
 ```
 
 Note that the REW format is identical to the MPS file format, except that all
 names are replaced with generic identifiers.
 
-**The SDPA file format**
+### The SDPA file format
 
 ```jldoctest
 julia> model = MOI.FileFormats.Model(format = MOI.FileFormats.FORMAT_SDPA)
-A SemiDefinite Programming Algorithm Format (SDPA) model
+MOI.FileFormats.SDPA.Model
+├ ObjectiveSense: FEASIBILITY_SENSE
+├ ObjectiveFunctionType: MOI.ScalarAffineFunction{Float64}
+├ NumberOfVariables: 0
+└ NumberOfConstraints: 0
 ```
 
 ## Write to file
@@ -75,11 +103,9 @@ use:
 ```jldoctest fileformats
 julia> src = MOI.Utilities.Model{Float64}();
 
-julia> MOI.add_variable(src)
-MOI.VariableIndex(1)
+julia> MOI.add_variable(src);
 
-julia> dest = MOI.FileFormats.Model(format = MOI.FileFormats.FORMAT_MOF)
-A MathOptFormat Model
+julia> dest = MOI.FileFormats.Model(format = MOI.FileFormats.FORMAT_MOF);
 
 julia> MOI.copy_to(dest, src)
 MathOptInterface.Utilities.IndexMap with 1 entry:
@@ -110,8 +136,7 @@ julia> print(read("file.mof.json", String))
 
 To read a MathOptFormat file, use:
 ```jldoctest fileformats
-julia> dest = MOI.FileFormats.Model(format = MOI.FileFormats.FORMAT_MOF)
-A MathOptFormat Model
+julia> dest = MOI.FileFormats.Model(format = MOI.FileFormats.FORMAT_MOF);
 
 julia> MOI.read_from_file(dest, "file.mof.json")
 
@@ -131,29 +156,14 @@ guess the format from the file extension. For example:
 ```jldoctest fileformats
 julia> src = MOI.Utilities.Model{Float64}();
 
-julia> dest = MOI.FileFormats.Model(filename = "file.cbf.gz")
-A Conic Benchmark Format (CBF) model
+julia> dest = MOI.FileFormats.Model(filename = "file.cbf.gz");
 
 julia> MOI.copy_to(dest, src)
 MathOptInterface.Utilities.IndexMap()
 
 julia> MOI.write_to_file(dest, "file.cbf.gz")
 
-julia> src_2 = MOI.FileFormats.Model(filename = "file.cbf.gz")
-A Conic Benchmark Format (CBF) model
-
-julia> src = MOI.Utilities.Model{Float64}();
-
-julia> dest = MOI.FileFormats.Model(filename = "file.cbf.gz")
-A Conic Benchmark Format (CBF) model
-
-julia> MOI.copy_to(dest, src)
-MathOptInterface.Utilities.IndexMap()
-
-julia> MOI.write_to_file(dest, "file.cbf.gz")
-
-julia> src_2 = MOI.FileFormats.Model(filename = "file.cbf.gz")
-A Conic Benchmark Format (CBF) model
+julia> src_2 = MOI.FileFormats.Model(filename = "file.cbf.gz");
 
 julia> MOI.read_from_file(src_2, "file.cbf.gz")
 
@@ -167,14 +177,22 @@ filename.
 In some cases `src` may contain constraints that are not supported by the file
 format (for example, the CBF format supports integer variables but not binary).
 If so, copy `src` to a bridged model using [`Bridges.full_bridge_optimizer`](@ref):
-```julia
-src = MOI.Utilities.Model{Float64}()
-x = MOI.add_variable(model)
-MOI.add_constraint(model, x, MOI.ZeroOne())
-dest = MOI.FileFormats.Model(format = MOI.FileFormats.FORMAT_CBF)
-bridged = MOI.Bridges.full_bridge_optimizer(dest, Float64)
-MOI.copy_to(bridged, src)
-MOI.write_to_file(dest, "my_model.cbf")
+```jldoctest
+julia> src = MOI.Utilities.Model{Float64}();
+
+julia> x = MOI.add_variable(src);
+
+julia> MOI.add_constraint(src, x, MOI.ZeroOne());
+
+julia> dest = MOI.FileFormats.Model(format = MOI.FileFormats.FORMAT_CBF);
+
+julia> bridged = MOI.Bridges.full_bridge_optimizer(dest, Float64);
+
+julia> MOI.copy_to(bridged, src);
+
+julia> MOI.write_to_file(dest, "my_model.cbf")
+
+julia> rm("my_model.cbf")  # Clean up after ourselves.
 ```
 !!! note
     Even after bridging, it may still not be possible to write the model to file
@@ -188,8 +206,7 @@ read and write directly from `IO` streams using `Base.write` and `Base.read!`:
 ```jldoctest
 julia> src = MOI.Utilities.Model{Float64}();
 
-julia> dest = MOI.FileFormats.Model(format = MOI.FileFormats.FORMAT_MPS)
-A Mathematical Programming System (MPS) model
+julia> dest = MOI.FileFormats.Model(format = MOI.FileFormats.FORMAT_MPS);
 
 julia> MOI.copy_to(dest, src)
 MathOptInterface.Utilities.IndexMap()
@@ -200,8 +217,7 @@ julia> write(io, dest)
 
 julia> seekstart(io);
 
-julia> src_2 = MOI.FileFormats.Model(format = MOI.FileFormats.FORMAT_MPS)
-A Mathematical Programming System (MPS) model
+julia> src_2 = MOI.FileFormats.Model(format = MOI.FileFormats.FORMAT_MPS);
 
 julia> read!(io, src_2);
 ```
@@ -218,14 +234,12 @@ pass the `use_nlp_block = false` keyword argument to the `Model` constructor:
 julia> model = MOI.FileFormats.Model(;
            format = MOI.FileFormats.FORMAT_MOF,
            use_nlp_block = false,
-       )
-A MathOptFormat Model
+       );
 
 julia> model = MOI.FileFormats.Model(;
            format = MOI.FileFormats.FORMAT_NL,
            use_nlp_block = false,
-       )
-An AMPL (.nl) model
+       );
 ```
 
 ## Validating MOF files

docs/src/tutorials/implementing.md

@@ -298,10 +298,10 @@ interface.
     isn't clear, let us know and we will improve the docstrings.
     It is also very helpful to look at an existing wrapper for a similar solver.
 
-You should also implement `Base.show(::IO, ::Optimizer)` to print a nice string
-when someone prints your model. For example
+You should also implement `Base.summary(::IO, ::Optimizer)` to print a nice
+string when someone shows your model. For example
 ```julia
-function Base.show(io::IO, model::Optimizer)
+function Base.summary(io::IO, model::Optimizer)
     return print(io, "NewSolver with the pointer $(model.ptr)")
 end
 ```

src/FileFormats/CBF/CBF.jl

@@ -61,7 +61,7 @@ Create an empty instance of `FileFormats.CBF.Model`.
 """
 Model(; kwargs...) = Model{Float64}()
 
-Base.show(io::IO, ::Model) = print(io, "A Conic Benchmark Format (CBF) model")
+Base.summary(io::IO, ::Model) = print(io, "MOI.FileFormats.CBF.Model")
 
 include("read.jl")
 include("write.jl")

src/FileFormats/LP/LP.jl

@@ -91,10 +91,7 @@ function Model(; maximum_length::Int = 255, warn::Bool = false)
     return model
 end
 
-function Base.show(io::IO, ::Model)
-    print(io, "A .LP-file model")
-    return
-end
+Base.summary(io::IO, ::Model) = print(io, "MOI.FileFormats.LP.Model")
 
 # ==============================================================================
 #

src/FileFormats/MOF/MOF.jl

@@ -157,10 +157,7 @@ function Model(;
     return model
 end
 
-function Base.show(io::IO, ::Model)
-    print(io, "A MathOptFormat Model")
-    return
-end
+Base.summary(io::IO, ::Model) = print(io, "MOI.FileFormats.MOF.Model")
 
 include("read.jl")
 include("write.jl")

src/FileFormats/MPS/MPS.jl

@@ -142,10 +142,7 @@ function Model(;
     return model
 end
 
-function Base.show(io::IO, ::Model)
-    print(io, "A Mathematical Programming System (MPS) model")
-    return
-end
+Base.summary(io::IO, ::Model) = print(io, "MOI.FileFormats.MPS.Model")
 
 @enum(VType, VTYPE_CONTINUOUS, VTYPE_INTEGER, VTYPE_BINARY)
 

src/FileFormats/NL/NL.jl

@@ -164,7 +164,7 @@ mutable struct Model <: MOI.ModelLike
     end
 end
 
-Base.show(io::IO, ::Model) = print(io, "An AMPL (.nl) model")
+Base.summary(io::IO, ::Model) = print(io, "MOI.FileFormats.NL.Model")
 
 MOI.get(model::Model, ::MOI.SolverName) = "AmplNLWriter"
 

src/FileFormats/SDPA/SDPA.jl

@@ -127,9 +127,7 @@ function Model(; number_type::Type = Float64)
     return model
 end
 
-function Base.show(io::IO, ::Model)
-    return print(io, "A SemiDefinite Programming Algorithm Format (SDPA) model")
-end
+Base.summary(io::IO, ::Model) = print(io, "MOI.FileFormats.SDPA.Model")
 
 # ==============================================================================
 #

src/MathOptInterface.jl

@@ -30,7 +30,8 @@ end
 
 function Base.show(io::IO, model::ModelLike)
     offset = Base.get(io, :offset, "")
-    Utilities.print_with_acronym(io, "$(typeof(model))\n")
+    Utilities.print_with_acronym(io, summary(model))
+    println(io)
     # ObjectiveSense
     sense = _try_get(model, ObjectiveSense(), "unknown")
     println(io, offset, "├ ObjectiveSense: $sense")

test/FileFormats/CBF/CBF.jl

@@ -87,7 +87,7 @@ function _test_read(filename::String, model_string::String)
 end
 
 function test_show()
-    @test sprint(show, CBF.Model()) == "A Conic Benchmark Format (CBF) model"
+    @test sprint(summary, CBF.Model()) == "MOI.FileFormats.CBF.Model"
     return
 end
 

test/FileFormats/LP/LP.jl

@@ -13,7 +13,7 @@ const LP = MOI.FileFormats.LP
 const LP_TEST_FILE = "test.lp"
 
 function test_show()
-    @test sprint(show, LP.Model()) == "A .LP-file model"
+    @test sprint(summary, LP.Model()) == "MOI.FileFormats.LP.Model"
     return
 end
 

test/FileFormats/MOF/MOF.jl

@@ -321,7 +321,7 @@ function test_nonlinear_readingwriting()
 end
 
 function test_show()
-    @test sprint(show, MOF.Model()) == "A MathOptFormat Model"
+    @test sprint(summary, MOF.Model()) == "MOI.FileFormats.MOF.Model"
 end
 
 function test_nonempty_model()

test/FileFormats/MPS/MPS.jl

@@ -60,8 +60,7 @@ function _test_model_equality(
 end
 
 function test_show()
-    @test sprint(show, MPS.Model()) ==
-          "A Mathematical Programming System (MPS) model"
+    @test sprint(summary, MPS.Model()) == "MOI.FileFormats.MPS.Model"
     return
 end
 

test/FileFormats/NL/NL.jl

@@ -1145,8 +1145,8 @@ function test_SolverName()
 end
 
 function test_show()
-    model = NL.Model()
-    @test sprint(show, model) == "An AMPL (.nl) model"
+    @test sprint(summary, NL.Model()) == "MOI.FileFormats.NL.Model"
+    return
 end
 
 function test_linear_constraint_types()

test/FileFormats/SDPA/SDPA.jl

@@ -88,8 +88,8 @@ function _test_read(filename::String, model_string::String)
 end
 
 function test_show()
-    @test sprint(show, SDPA.Model()) ==
-          "A SemiDefinite Programming Algorithm Format (SDPA) model"
+    @test sprint(summary, SDPA.Model()) == "MOI.FileFormats.SDPA.Model"
+    return
 end
 
 function test_support()