Add new negated-type syntax for disabling default plugins (#167)

docs/src/migrating.md

@@ -16,7 +16,7 @@ The recurring theme is "everything is a plugin now".
 | :------------------: | :-------------------------------: |
 | `license="ISC"`      | `plugins=[License(; name="ISC")]` |
 | `develop=true` *     | `plugins=[Develop()]`             |
-| `git=false`          | `disable_defaults=[Git]`          |
+| `git=false`          | `plugins=[!Git]`                  |
 | `julia_version=v"1"` | `julia=v"1"`                      |
 | `ssh=true`           | `plugins=[Git(; ssh=true)]`       |
 | `manifest=true`      | `plugins=[Git(; manifest=true)]`  |

docs/src/user.md

@@ -31,7 +31,7 @@ There are a number of plugins available to automate common boilerplate tasks.
 ### Default Plugins
 
 These plugins are included by default.
-They can be overridden by supplying another value via the `plugins` keyword, or disabled by supplying the type via the `disable_defaults` keyword.
+They can be overridden by supplying another value, or disabled by negating the type (`!Type`), both as elements of the `plugins` keyword.
 
 ```@docs
 ProjectFile

src/plugin.jl

@@ -5,6 +5,9 @@ function Base.:(==)(a::T, b::T) where T <: Plugin
     return all(n -> getfield(a, n) == getfield(b, n), fieldnames(T))
 end
 
+struct Disabled{P<:Plugin} end
+Base.:(!)(P::Type{<:Plugin}) = Disabled{P}()
+
 """
     Secret(name::AbstractString)
 

src/template.jl

@@ -41,10 +41,10 @@ A configuration used to generate packages.
 
 ### Template Plugins
 - `plugins::Vector{<:Plugin}=Plugin[]`: A list of [`Plugin`](@ref)s used by the template.
-- `disable_defaults::Vector{DataType}=DataType[]`: Default plugins to disable.
   The default plugins are [`ProjectFile`](@ref), [`SrcDir`](@ref), [`Tests`](@ref),
   [`Readme`](@ref), [`License`](@ref), and [`Git`](@ref).
-  To override a default plugin instead of disabling it altogether, supply it via `plugins`.
+  To disable a default plugin, pass in the negated type: `!PluginType`.
+  To override a default plugin instead of disabling it, pass in your own instance.
 
 ---
 
@@ -80,11 +80,11 @@ function Template(::Val{false}; kwargs...)
     authors isa Vector || (authors = map(strip, split(authors, ",")))
 
     # User-supplied plugins come first, so that deduping the list will remove the defaults.
-    plugins = Plugin[]
-    append!(plugins, getkw!(kwargs, :plugins))
-    disabled = getkw!(kwargs, :disable_defaults)
+    plugins = Vector{Any}(collect(getkw!(kwargs, :plugins)))
+    disabled = map(d -> first(typeof(d).parameters), filter(p -> p isa Disabled, plugins))
+    filter!(p -> p isa Plugin, plugins)
     append!(plugins, filter(p -> !(typeof(p) in disabled), default_plugins()))
-    plugins = sort(unique(typeof, plugins); by=string)
+    plugins = Vector{Plugin}(sort(unique(typeof, plugins); by=string))
 
     if isempty(user)
         foreach(plugins) do p
@@ -157,7 +157,6 @@ getkw!(kwargs, k) = pop!(kwargs, k, defaultkw(Template, k))
 defaultkw(::Type{T}, s::Symbol) where T = defaultkw(T, Val(s))
 defaultkw(::Type{Template}, ::Val{:authors}) = default_authors()
 defaultkw(::Type{Template}, ::Val{:dir}) = Pkg.devdir()
-defaultkw(::Type{Template}, ::Val{:disable_defaults}) = DataType[]
 defaultkw(::Type{Template}, ::Val{:host}) = "github.com"
 defaultkw(::Type{Template}, ::Val{:julia}) = default_version()
 defaultkw(::Type{Template}, ::Val{:plugins}) = Plugin[]

test/git.jl

@@ -1,6 +1,6 @@
 @testset "Git repositories" begin
     @testset "Does not create Git repo" begin
-        t = tpl(; disable_defaults=[Git])
+        t = tpl(; plugins=[!Git])
         with_pkg(t) do pkg
             pkg_dir = joinpath(t.dir, pkg)
             @test !isdir(joinpath(pkg_dir, ".git"))
@@ -47,7 +47,7 @@
 
     @testset "Adds version to commit message" begin
         # We're careful to avoid a Pkg.update as it triggers Cassette#130.
-        t = tpl(; disable_defaults=[Tests], plugins=[Git()])
+        t = tpl(; plugins=[Git(), !Tests])
         mock(PT.version_of => _p -> v"1.2.3") do _i
             with_pkg(t) do pkg
                 pkg_dir = joinpath(t.dir, pkg)

test/template.jl

@@ -3,7 +3,7 @@
         @testset "user" begin
             mock(PT.default_user => () -> "") do _du
                 @test_throws ArgumentError Template()
-                @test isempty(Template(; disable_defaults=[Git]).user)
+                @test isempty(Template(; plugins=[!Git]).user)
             end
             mock(PT.default_user => () -> "username") do _du
                 @test Template().user == "username"
@@ -27,9 +27,9 @@
             @test tpl(; dir="~/foo").dir == abspath(expanduser("~/foo"))
         end
 
-        @testset "plugins / disabled_defaults" begin
-            function test_plugins(plugins, expected, disabled=DataType[])
-                t = tpl(; plugins=plugins, disable_defaults=disabled)
+        @testset "plugins" begin
+            function test_plugins(plugins, expected)
+                t = tpl(; plugins=plugins)
                 @test all(map(==, sort(t.plugins; by=string), sort(expected; by=string)))
             end
 
@@ -41,7 +41,7 @@
             g = Git(; ssh=true)
             test_plugins([g], union(setdiff(defaults, [default_g]), [g]))
             # Disabling a default plugin.
-            test_plugins([], setdiff(defaults, [default_g]), [Git])
+            test_plugins([!Git], setdiff(defaults, [default_g]))
         end
 
         @testset "Unsupported keywords warning" begin