Add a pretty show method

src/plugin.jl

@@ -1,3 +1,5 @@
+import Base.show
+
 """
 Generic plugins are plugins that add any number of patterns to the generated package's
 `.gitignore`, and have at most one associated file to generate.
@@ -67,6 +69,23 @@ config template file doesn't follow the generic naming convention, we added anot
 """
 abstract type GenericPlugin <: Plugin end
 
+function show(io::IO, p::GenericPlugin)
+    t = split(string(typeof(p)), ".")[end]
+    println(io, "$t:")
+
+    cfg = if isnull(p.src)
+        "None"
+    else
+        dirname(get(p.src)) == DEFAULTS_DIR ? "Default" : get(p.src)
+    end
+    println(io, "    → Config file: $cfg")
+
+    n = length(p.gitignore)
+    s = n == 1 ? "" : "s"
+    print(io, "    → $n gitignore entrie$s")
+    n > 0 && print(io, ": $(join(map(g -> "\"$g\"", p.gitignore), ", "))")
+end
+
 """
 Custom plugins are plugins whose behaviour does not follow the [`GenericPlugin`](@ref)
 pattern. They can implement [`gen_plugin`](@ref), [`badges`](@ref), and

src/plugins/documenter.jl

@@ -1,3 +1,5 @@
+import Base.show
+
 """
 Add a `Documenter` subtype to a template's plugins to add support for documentation
 generation via [Documenter.jl](https://github.com/JuliaDocs/Documenter.jl).
@@ -59,6 +61,25 @@ function gen_plugin(
     end
 end
 
+function show(io::IO, p::Documenter)
+    t = split(string(typeof(p)), ".")[end]
+    println(io, "$t:")
+
+    n = length(p.assets)
+    s = n == 1 ? "" : "s"
+    print(io, "    → $n asset file$s")
+    if n == 0
+        println(io)
+    else
+        println(io, ": $(join(map(a -> replace(a, homedir(), "~"), p.assets), ", "))")
+    end
+
+    n = length(p.gitignore)
+    s = n == 1 ? "" : "s"
+    print(io, "    → $n gitignore entrie$s")
+    n > 0 && print(io, ": $(join(map(g -> "\"$g\"", p.gitignore), ", "))")
+end
+
 function interactive(plugin_type::Type{<:Documenter})
     plugin_name = split(string(plugin_type), ".")[end]
     print("$plugin_name: Enter any Documenter asset files (separated by spaces) []: ")

src/template.jl

@@ -1,3 +1,5 @@
+import Base.show
+
 """
     Template(; kwargs...) -> Template
 
@@ -111,6 +113,61 @@ create a template, you can use [`interactive_template`](@ref) instead.
     end
 end
 
+function show(io::IO, t::Template)
+    maybe_none(s::AbstractString) = isempty(string(s)) ? "None" : string(s)
+    spc = "  "
+
+    println(io, "Template:")
+    println(io, "$spc→ User: $(maybe_none(t.user))")
+    println(io, "$spc→ Host: $(maybe_none(t.host))")
+    println(io, "$spc→ License: $(maybe_none(t.license))")
+
+    # We don't care about authors or license years if there is no license.
+    if !isempty(t.license)
+        # TODO: Authors could be split into multiple lines if there are more than one.
+        # Maybe the authors field of Template should be an array (or Dict, see #4).
+        println(io, "$spc→ Authors: $(maybe_none(t.authors))")
+        println(io, "$spc→ License years: $(maybe_none(t.years))")
+    end
+
+    println(io, "$spc→ Package directory: $(replace(maybe_none(t.dir), homedir(), "~"))")
+    println(io, "$spc→ Precompilation enabled: $(t.precompile ? "yes" : "no")")
+    println(io, "$spc→ Minimum Julia version: v$(t.julia_version)")
+
+    print(io, "$spc→ Package dependencies: ")
+    if isempty(t.requirements)
+        println(io, "None")
+    else
+        println(io)
+        for req in sort(t.requirements)
+            println(io, "$(spc^2)• $req")
+        end
+    end
+
+    print(io, "$spc→ Git configuration options: ")
+    if isempty(t.gitconfig)
+        println(io, "None")
+    else
+        println(io)
+        for k in sort(collect(keys(t.gitconfig)); by=string)
+            println(io, "$(spc^2)• $k = $(t.gitconfig[k])")
+        end
+    end
+
+    print(io, "$spc→ Plugins: ")
+    if isempty(t.plugins)
+        print(io, "None")
+    else
+        for plugin in sort(collect(values(t.plugins)); by=string)
+            println(io)
+            buf = IOBuffer()
+            show(buf, plugin)
+            print(io, "$(spc^2)• ")
+            print(io, join(split(String(take!(buf)), "\n"), "\n$(spc^2)"))
+        end
+    end
+end
+
 """
     interactive_template(; fast::Bool=false) -> Template