JuliaFormatter & workflow

.JuliaFormatter.toml

@@ -0,0 +1 @@
+style = "blue"

.github/workflows/format.yml

@@ -0,0 +1,27 @@
+name: Format suggestions
+
+on:
+  pull_request:
+
+concurrency:
+  # Skip intermediate builds: always.
+  # Cancel intermediate builds: only if it is a pull request build.
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+
+jobs:
+  format:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: julia-actions/setup-julia@latest
+        with:
+          version: 1
+      - run: |
+          julia  -e 'using Pkg; Pkg.add("JuliaFormatter")'
+          julia  -e 'using JuliaFormatter; format("."; verbose=true)'
+      - uses: reviewdog/action-suggester@v1
+        with:
+          tool_name: JuliaFormatter
+          fail_on_error: true
+          filter_mode: added

docs/make.jl

@@ -16,20 +16,20 @@ DocMeta.setdocmeta!(
         @scalar_rule(sin(x), cos(x))  # frule and rrule doctest
         @scalar_rule(sincos(x), @setup((sinx, cosx) = Ω), cosx, -sinx)  # frule doctest
         @scalar_rule(hypot(x::Real, y::Real), (x / Ω, y / Ω))  # rrule doctest
-    end
+    end,
 )
 
 indigo = DocThemeIndigo.install(ChainRulesCore)
 
-makedocs(
+makedocs(;
     modules=[ChainRulesCore],
-    format=Documenter.HTML(
+    format=Documenter.HTML(;
         prettyurls=false,
         assets=[indigo],
         mathengine=MathJax3(
             Dict(
                 :tex => Dict(
-                    "inlineMath" => [["\$","\$"], ["\\(","\\)"]],
+                    "inlineMath" => [["\$", "\$"], ["\\(", "\\)"]],
                     "tags" => "ams",
                     # TODO: remove when using physics package
                     "macros" => Dict(
@@ -67,7 +67,4 @@ makedocs(
     checkdocs=:exports,
 )
 
-deploydocs(
-    repo = "github.com/JuliaDiff/ChainRulesCore.jl.git",
-    push_preview=true,
-)
+deploydocs(; repo="github.com/JuliaDiff/ChainRulesCore.jl.git", push_preview=true)

docs/src/assets/make_logo.jl

@@ -9,79 +9,76 @@ using Random
 const bridge_len = 50
 
 function chain(jiggle=0)
-    shaky_rotate(θ) = rotate(θ + jiggle*(rand()-0.5))
-    
+    shaky_rotate(θ) = rotate(θ + jiggle * (rand() - 0.5))
+
     ### 1
     shaky_rotate(0)
     sethue(Luxor.julia_red)
     link()
     m1 = getmatrix()
-
-
+
     ### 2
     sethue(Luxor.julia_green)
-    translate(-50, 130);
-    shaky_rotate(π/3); 
+    translate(-50, 130)
+    shaky_rotate(π / 3)
     link()
     m2 = getmatrix()
-    
+
     setmatrix(m1)
     sethue(Luxor.julia_red)
     overlap(-1.3π)
     setmatrix(m2)
-    
+
     ### 3
-    shaky_rotate(-π/3);
-    translate(-120,80);
+    shaky_rotate(-π / 3)
+    translate(-120, 80)
     sethue(Luxor.julia_purple)
     link()
-    
+
     setmatrix(m2)
     setcolor(Luxor.julia_green)
-    overlap(-1.5π)
+    return overlap(-1.5π)
 end
 
-
 function link()
     sector(50, 90, π, 0, :fill)
     sector(Point(0, bridge_len), 50, 90, 0, -π, :fill)
-
-
-    rect(50,-3,40, bridge_len+6, :fill)
-    rect(-50-40,-3,40, bridge_len+6, :fill)
-
+
+    rect(50, -3, 40, bridge_len + 6, :fill)
+    rect(-50 - 40, -3, 40, bridge_len + 6, :fill)
+
     sethue("black")
     move(Point(-50, bridge_len))
-    arc(Point(0,0), 50, π, 0, :stoke)
+    arc(Point(0, 0), 50, π, 0, :stoke)
     arc(Point(0, bridge_len), 50, 0, -π, :stroke)
-    
+
     move(Point(-90, bridge_len))
-    arc(Point(0,0), 90, π, 0, :stoke)
+    arc(Point(0, 0), 90, π, 0, :stoke)
     arc(Point(0, bridge_len), 90, 0, -π, :stroke)
-    strokepath()
+    return strokepath()
 end
 
 function overlap(ang_end)
-    sector(Point(0, bridge_len), 50, 90, -0., ang_end, :fill)
+    sector(Point(0, bridge_len), 50, 90, -0.0, ang_end, :fill)
     sethue("black")
     arc(Point(0, bridge_len), 50, 0, ang_end, :stoke)
     move(Point(90, bridge_len))
     arc(Point(0, bridge_len), 90, 0, ang_end, :stoke)
 
-    strokepath()
+    return strokepath()
 end
 
 # Actually draw it
 
 function save_logo(filename)
     Random.seed!(16)
-    Drawing(450,450, filename)
+    Drawing(450, 450, filename)
     origin()
-    translate(50, -130);
+    translate(50, -130)
     chain(0.5)
     finish()
-    preview()
+    return preview()
 end
 
 save_logo("logo.svg")
-save_logo("logo.png")
+save_logo("logo.png")

src/accumulation.jl

@@ -26,15 +26,14 @@ end
 
 add!!(x::AbstractArray, y::Thunk) = add!!(x, unthunk(y))
 
-function add!!(x::AbstractArray{<:Any, N}, y::AbstractArray{<:Any, N}) where N
+function add!!(x::AbstractArray{<:Any,N}, y::AbstractArray{<:Any,N}) where {N}
     return if is_inplaceable_destination(x)
         x .+= y
     else
         x + y
     end
 end
 
-
 """
     is_inplaceable_destination(x) -> Bool
 
@@ -64,7 +63,6 @@ end
 is_inplaceable_destination(::LinearAlgebra.Hermitian) = false
 is_inplaceable_destination(::LinearAlgebra.Symmetric) = false
 
-
 function debug_add!(accumuland, t::InplaceableThunk)
     returned_value = t.add!(accumuland)
     if returned_value !== accumuland
@@ -88,7 +86,7 @@ function Base.showerror(io::IO, err::BadInplaceException)
     if err.accumuland == err.returned_value
         println(
             io,
-            "Which in this case happenned to be equal. But they are not the same object."
+            "Which in this case happenned to be equal. But they are not the same object.",
         )
     end
 end

src/compat.jl

@@ -5,15 +5,15 @@ end
 if VERSION < v"1.1"
     # Note: these are actually *better* than the ones in julia 1.1, 1.2, 1.3,and 1.4
     # See: https://github.com/JuliaLang/julia/issues/34292
-    function fieldtypes(::Type{T}) where T
+    function fieldtypes(::Type{T}) where {T}
         if @generated
             ntuple(i -> fieldtype(T, i), fieldcount(T))
         else
             ntuple(i -> fieldtype(T, i), fieldcount(T))
         end
     end
 
-    function fieldnames(::Type{T}) where T
+    function fieldnames(::Type{T}) where {T}
         if @generated
             ntuple(i -> fieldname(T, i), fieldcount(T))
         else

src/config.jl

@@ -64,7 +64,6 @@ that do not support performing forwards mode AD should be `RuleConfig{>:NoForwar
 """
 struct NoForwardsMode <: ForwardsModeCapability end
 
-
 """
     frule_via_ad(::RuleConfig{>:HasForwardsMode}, ȧrgs, f, args...; kwargs...)
 

src/deprecated.jl

@@ -0,0 +1 @@
+

src/ignore_derivatives.jl

@@ -45,7 +45,9 @@ ignore_derivatives(x) = x
 Tells the AD system to ignore the expression. Equivalent to `ignore_derivatives() do (...) end`.
 """
 macro ignore_derivatives(ex)
-    return :(ChainRulesCore.ignore_derivatives() do
-        $(esc(ex))
-    end)
+    return :(
+        ChainRulesCore.ignore_derivatives() do
+            $(esc(ex))
+        end
+    )
 end

src/projection.jl

@@ -32,7 +32,7 @@ ProjectTo{P}() where {P} = ProjectTo{P}(EMPTY_NT)
 
 const Type_kwfunc = Core.kwftype(Type).instance
 function (::typeof(Type_kwfunc))(kws::Any, ::Type{ProjectTo{P}}) where {P}
-    ProjectTo{P}(NamedTuple(kws))
+    return ProjectTo{P}(NamedTuple(kws))
 end
 
 Base.getproperty(p::ProjectTo, name::Symbol) = getproperty(backing(p), name)
@@ -131,7 +131,10 @@ ProjectTo(::AbstractZero) = ProjectTo{NoTangent}()  # Any x::Zero in forward pas
 # Also, any explicit construction with fields, where all fields project to zero, itself
 # projects to zero. This simplifies projectors for wrapper types like Diagonal([true, false]).
 const _PZ = ProjectTo{<:AbstractZero}
-ProjectTo{P}(::NamedTuple{T, <:Tuple{_PZ, Vararg{<:_PZ}}}) where {P,T} = ProjectTo{NoTangent}()
+const _PZ_Tuple = Tuple{_PZ,Vararg{<:_PZ}}  # 1 or more ProjectTo{<:AbstractZeros}
+function ProjectTo{P}(::NamedTuple{T,<:_PZ_Tuple}) where {P,T}
+    return ProjectTo{NoTangent}()
+end
 
 # Tangent
 # We haven't entirely figured out when to convert Tangents to "natural" representations such as
@@ -164,12 +167,16 @@ for T in (Float16, Float32, Float64, ComplexF16, ComplexF32, ComplexF64)
 end
 
 # In these cases we can just `convert` as we know we are dealing with plain and simple types
-(::ProjectTo{T})(dx::AbstractFloat) where T<:AbstractFloat = convert(T, dx)
-(::ProjectTo{T})(dx::Integer) where T<:AbstractFloat = convert(T, dx)  #needed to avoid ambiguity
+(::ProjectTo{T})(dx::AbstractFloat) where {T<:AbstractFloat} = convert(T, dx)
+(::ProjectTo{T})(dx::Integer) where {T<:AbstractFloat} = convert(T, dx)  #needed to avoid ambiguity
 # simple Complex{<:AbstractFloat}} cases
-(::ProjectTo{T})(dx::Complex{<:AbstractFloat}) where {T<:Complex{<:AbstractFloat}} = convert(T, dx)
+function (::ProjectTo{T})(dx::Complex{<:AbstractFloat}) where {T<:Complex{<:AbstractFloat}}
+    return convert(T, dx)
+end
 (::ProjectTo{T})(dx::AbstractFloat) where {T<:Complex{<:AbstractFloat}} = convert(T, dx)
-(::ProjectTo{T})(dx::Complex{<:Integer}) where {T<:Complex{<:AbstractFloat}} = convert(T, dx)
+function (::ProjectTo{T})(dx::Complex{<:Integer}) where {T<:Complex{<:AbstractFloat}}
+    return convert(T, dx)
+end
 (::ProjectTo{T})(dx::Integer) where {T<:Complex{<:AbstractFloat}} = convert(T, dx)
 
 # Other numbers, including e.g. ForwardDiff.Dual and Symbolics.Sym, should pass through.
@@ -244,9 +251,11 @@ end
 # although really Ref() is probably a better structure.
 function (project::ProjectTo{AbstractArray})(dx::Number) # ... so we restore from numbers
     if !(project.axes isa Tuple{})
-        throw(DimensionMismatch(
-            "array with ndims(x) == $(length(project.axes)) >  0 cannot have dx::Number",
-        ))
+        throw(
+            DimensionMismatch(
+                "array with ndims(x) == $(length(project.axes)) >  0 cannot have dx::Number"
+            ),
+        )
     end
     return fill(project.element(dx))
 end
@@ -298,7 +307,9 @@ function (project::ProjectTo{Adjoint})(dx::AbstractArray)
     return adjoint(project.parent(dy))
 end
 
-ProjectTo(x::LinearAlgebra.TransposeAbsVec) = ProjectTo{Transpose}(; parent=ProjectTo(parent(x)))
+function ProjectTo(x::LinearAlgebra.TransposeAbsVec)
+    return ProjectTo{Transpose}(; parent=ProjectTo(parent(x)))
+end
 function (project::ProjectTo{Transpose})(dx::LinearAlgebra.AdjOrTransAbsVec)
     return transpose(project.parent(transpose(dx)))
 end
@@ -316,10 +327,8 @@ ProjectTo(x::Diagonal) = ProjectTo{Diagonal}(; diag=ProjectTo(x.diag))
 (project::ProjectTo{Diagonal})(dx::Diagonal) = Diagonal(project.diag(dx.diag))
 
 # Symmetric
-for (SymHerm, chk, fun) in (
-    (:Symmetric, :issymmetric, :transpose),
-    (:Hermitian, :ishermitian, :adjoint),
-    )
+for (SymHerm, chk, fun) in
+    ((:Symmetric, :issymmetric, :transpose), (:Hermitian, :ishermitian, :adjoint))
     @eval begin
         function ProjectTo(x::$SymHerm)
             sub = ProjectTo(parent(x))