Switch to using package extensions

Project.toml

@@ -8,14 +8,29 @@ AbstractTrees = "1520ce14-60c1-5f80-bbc7-55ef81b5835c"
 FoldingTrees = "1eca21be-9b9b-4ed8-839a-6d8ae26b1781"
 InteractiveUtils = "b77e0a4c-d291-57a0-90e8-8db25a27a240"
 IterTools = "c8e1da08-722c-5040-9ed9-7db0dc04731e"
+PackageExtensionCompat = "65ce6f38-6b18-4e1d-a461-8949797d7930"
 REPL = "3fa0cd96-eef1-5676-8a61-b3b8758bbffb"
 Requires = "ae029012-a4dd-5104-9daa-d747884805df"
 
+[weakdeps]
+Cthulhu = "f68482b8-f384-11e8-15f7-abe071a5a75f"
+Debugger = "31a5f54b-26ea-5ae9-a837-f05ce5417438"
+JET = "c3a54625-cd67-489e-a8e7-0a5a0ff4e31b"
+JuliaFormatter = "98e50ef6-434e-11e9-1051-2b60c6c9e899"
+OhMyREPL = "5fb14364-9ced-5910-84b2-373655c76a03"
+
+[extensions]
+InteractiveErrorsCthulhuExt = "Cthulhu"
+InteractiveErrorsDebuggerExt = "Debugger"
+InteractiveErrorsJETExt = "JET"
+InteractiveErrorsJuliaFormatterExt = "JuliaFormatter"
+InteractiveErrorsOhMyREPLExt = "OhMyREPL"
+
 [compat]
 AbstractTrees = "0.3, 0.4"
 FoldingTrees = "1.1"
 IterTools = "1"
-Requires = "1"
+PackageExtensionCompat = "1"
 julia = "1.6"
 
 [extras]

ext/InteractiveErrorsCthulhuExt.jl

@@ -0,0 +1,12 @@
+module InteractiveErrorsCthulhuExt
+
+import Cthulhu
+import InteractiveErrors
+
+InteractiveErrors.has_cthulhu() = true
+
+InteractiveErrors.ascend(mi::Core.MethodInstance) = Cthulhu.ascend(mi)
+
+InteractiveErrors.descend(mi::Core.MethodInstance) = Cthulhu.descend(mi)
+
+end

ext/InteractiveErrorsDebuggerExt.jl

@@ -0,0 +1,10 @@
+module InteractiveErrorsDebuggerExt
+
+import Debugger
+import InteractiveErrors
+
+InteractiveErrors.has_debugger() = true
+
+InteractiveErrors.breakpoint(file::AbstractString, line::Integer) = Debugger.breakpoint(file, line)
+
+end

ext/InteractiveErrorsJETExt.jl

@@ -0,0 +1,17 @@
+module InteractiveErrorsJETExt
+
+import JET
+import InteractiveErrors
+
+InteractiveErrors.has_jet() = true
+
+function InteractiveErrors.report_call(mi::Core.MethodInstance)
+    func = Base.tuple_type_head(mi.specTypes).instance
+    sig = Base.tuple_type_tail(mi.specTypes)
+    result = JET.report_call(func, sig)
+    @info "Press return to continue."
+    readline()
+    return result
+end
+
+end

ext/InteractiveErrorsJuliaFormatterExt.jl

@@ -0,0 +1,17 @@
+module InteractiveErrorsJuliaFormatterExt
+
+import JuliaFormatter
+import InteractiveErrors
+
+InteractiveErrors.has_juliaformatter() = true
+
+function InteractiveErrors.format_julia_source(source::String)
+    try
+        return JuliaFormatter.format_text(source)
+    catch err
+        @debug "failed to format source" err source
+        return source
+    end
+end
+
+end

ext/InteractiveErrorsOhMyREPLExt.jl

@@ -0,0 +1,22 @@
+module InteractiveErrorsOhMyREPLExt
+
+import OhMyREPL
+import InteractiveErrors
+
+InteractiveErrors.has_ohmyrepl() = true
+
+function InteractiveErrors.highlight(source::String)
+    O = OhMyREPL
+    tokens = collect(O.tokenize(source))
+    crayons = fill(O.Crayon(), length(tokens))
+    O.Passes.SyntaxHighlighter.SYNTAX_HIGHLIGHTER_SETTINGS(crayons, tokens, 0, source)
+    io = IOBuffer()
+    for (token, crayon) in zip(tokens, crayons)
+        print(io, crayon)
+        print(io, O.untokenize(token, source))
+        print(io, O.Crayon(reset = true))
+    end
+    return String(take!(io))
+end
+
+end

src/InteractiveErrors.jl

@@ -2,7 +2,9 @@ module InteractiveErrors
 
 using FoldingTrees
 
-using REPL, REPL.TerminalMenus, InteractiveUtils, IterTools, Requires
+using REPL, REPL.TerminalMenus, InteractiveUtils, IterTools
+
+import PackageExtensionCompat
 
 export toggle, current_theme, set_theme!, reset_theme!, adjust_theme!
 
@@ -361,7 +363,7 @@ end
 
 
 #
-# Requires.
+# Extensions, these get extended in the `/ext` modules.
 #
 
 has_cthulhu(args...) = false
@@ -380,62 +382,13 @@ format_julia_source(source) = source
 has_ohmyrepl(args...) = false
 highlight(source) = style(source, :file_contents)
 
-function requires()
-    @require Cthulhu = "f68482b8-f384-11e8-15f7-abe071a5a75f" begin
-        has_cthulhu() = true
-        ascend(mi::Core.MethodInstance) = Cthulhu.ascend(mi)
-        descend(mi::Core.MethodInstance) = Cthulhu.descend(mi)
-    end
-    @require Debugger = "31a5f54b-26ea-5ae9-a837-f05ce5417438" begin
-        has_debugger() = true
-        breakpoint(file::AbstractString, line::Integer) = Debugger.breakpoint(file, line)
-    end
-    @require JET = "c3a54625-cd67-489e-a8e7-0a5a0ff4e31b" begin
-        has_jet() = true
-        function report_call(mi::Core.MethodInstance)
-            func = Base.tuple_type_head(mi.specTypes).instance
-            sig = Base.tuple_type_tail(mi.specTypes)
-            result = JET.report_call(func, sig)
-            @info "Press return to continue."
-            readline()
-            return result
-        end
-    end
-    @require JuliaFormatter = "98e50ef6-434e-11e9-1051-2b60c6c9e899" begin
-        has_juliaformatter() = true
-        format_julia_source(source::String) =
-            try
-                JuliaFormatter.format_text(source)
-            catch err
-                source
-            end
-    end
-    @require OhMyREPL = "5fb14364-9ced-5910-84b2-373655c76a03" begin
-        has_ohmyrepl() = true
-        function highlight(source::String)
-            O = OhMyREPL
-            tokens = collect(O.tokenize(source))
-            crayons = fill(O.Crayon(), length(tokens))
-            O.Passes.SyntaxHighlighter.SYNTAX_HIGHLIGHTER_SETTINGS(crayons, tokens, 0, source)
-            io = IOBuffer()
-            for (token, crayon) in zip(tokens, crayons)
-                print(io, crayon)
-                print(io, O.untokenize(token, source))
-                print(io, O.Crayon(reset = true))
-            end
-            return String(take!(io))
-        end
-    end
-end
-
-
 #
 # Module Initialisation.
 #
 
 function __init__()
     setup_repl()
-    requires()
+    PackageExtensionCompat.@require_extensions
 end
 
 end # module