[julia] Add startup.jl with some useful REPL AST transformations.

.julia/config/startup.jl

@@ -0,0 +1,21 @@
+if Base.isinteractive() &&
+   (REPL = get(Base.loaded_modules, Base.PkgId(Base.UUID("3fa0cd96-eef1-5676-8a61-b3b8758bbffb"), "REPL"), nothing); REPL !== nothing)
+
+   # Exit Julia with :q
+    pushfirst!(REPL.repl_ast_transforms, function(ast::Expr)
+        if Meta.isexpr(ast, :toplevel, 2) && ast.args[2] === QuoteNode(:q)
+            exit()
+        end
+        return ast
+    end)
+
+    # Automatically load Debugger.jl when encountering @enter
+    pushfirst!(REPL.repl_ast_transforms, function(ast::Expr)
+        if Meta.isexpr(ast, :toplevel, 2) && Meta.isexpr(ast.args[2], :macrocall) &&
+           ast.args[2].args[1] === Symbol("@enter") && !isdefined(Main, Symbol("@enter"))
+           @info "Loading Debugger..."
+           Core.eval(Main, :(using Debugger))
+        end
+        return ast
+    end)
+end