Add adapt definitions for SparseArrays

[mtfishman]

Closes #90.

With this PR the new behavior is:

julia> using Adapt, SparseArrays

julia> a = sprandn(2, 2, 0.5)
2×2 SparseMatrixCSC{Float64, Int64} with 2 stored entries:
 2.27897  -0.00209377
  ⋅         ⋅ 

julia> adapt(Array, a)
2×2 SparseMatrixCSC{Float64, Int64} with 2 stored entries:
 2.27897  -0.00209377
  ⋅         ⋅ 

julia> adapt(Array{Float32}, a)
2×2 SparseMatrixCSC{Float32, Int64} with 2 stored entries:
 2.27897  -0.00209377
  ⋅         ⋅ 

[github-actions]

Your PR requires formatting changes to meet the project's style guidelines.
Please consider running Runic (git runic master) to apply these changes.

Click here to view the suggested changes.

diff --git a/src/Adapt.jl b/src/Adapt.jl
index fe5f817..9b79755 100644
--- a/src/Adapt.jl
+++ b/src/Adapt.jl
@@ -73,12 +73,12 @@ end
 
 @static if !isdefined(Base, :get_extension)
 function __init__()
-    @require SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf" begin
-        include("../ext/AdaptSparseArraysExt.jl")
-    end
-    @require StaticArrays = "90137ffa-7385-5640-81b9-e52037218182" begin
-        include("../ext/AdaptStaticArraysExt.jl")
-    end
+        @require SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf" begin
+            include("../ext/AdaptSparseArraysExt.jl")
+        end
+        @require StaticArrays = "90137ffa-7385-5640-81b9-e52037218182" begin
+            include("../ext/AdaptStaticArraysExt.jl")
+        end
 end
 end
 

[maleadt]

julia> adapt(Array, a)
2×2 SparseMatrixCSC{Float64, Int64} with 2 stored entries:
 2.27897  -0.00209377
  ⋅         ⋅ 

I don't get this; you're asking for things to become an Array, yet you're disabling the materialization of a sparse array, which isn't an Array? For most intents and purposes, adapt should behave like convert, with the exception that it peeks through structural layers (structs, tuples, etc). convert(Array, ::SparseMatrixCSC) most definitely returns an Array, so I don't see why adapt(Array, ::SparseMatrixCSC) shouldn't.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 91.56%. Comparing base (447e7b8) to head (f6cb009).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Adapt.jl	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #91      +/-   ##
==========================================
- Coverage   93.42%   91.56%   -1.86%     
==========================================
  Files           6        7       +1     
  Lines          76       83       +7     
==========================================
+ Hits           71       76       +5     
- Misses          5        7       +2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[maleadt]

nightly failures happen on master too.

[maleadt]

x-ref #90 (comment)