From cd25c7acb237b16c7c659aaa8154f49f033b8424 Mon Sep 17 00:00:00 2001
From: Thomas Breloff <tom@breloff.com>
Date: Fri, 6 May 2016 11:39:17 -0400
Subject: [PATCH] markershape fix; added require option for recipes

---
 src/args.jl    | 3 ++-
 src/recipes.jl | 7 ++++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/args.jl b/src/args.jl
index 091634e6..aab66cdb 100644
--- a/src/args.jl
+++ b/src/args.jl
@@ -625,7 +625,8 @@ function preprocessArgs!(d::KW)
     kw = KW()
     for k in keys(d)
         try
-            default(k)
+            # this should error for invalid keywords (assume they are user-defined)
+            k == :markershape_to_add || default(k)
         catch
             # not a valid key... pop and add to user list
             kw[k] = pop!(d, k)
diff --git a/src/recipes.jl b/src/recipes.jl
index 9326bc32..aba9c09f 100644
--- a/src/recipes.jl
+++ b/src/recipes.jl
@@ -52,11 +52,13 @@ function replace_recipe_arrows!(expr::Expr)
 
             # process trailing flags, like:
             #   a --> b, :quiet, :force
-            quiet, force = false, false
+            quiet, require, force = false, false, false
             if _is_arrow_tuple(e)
                 for flag in e.args
                     if _equals_symbol(flag, :quiet)
                         quiet = true
+                    elseif _equals_symbol(flag, :require)
+                        require = true
                     elseif _equals_symbol(flag, :force)
                         force = true
                     end
@@ -80,6 +82,9 @@ function replace_recipe_arrows!(expr::Expr)
                 expr.args[i] = if quiet
                     # quietly ignore keywords which are not supported
                     :($keyexpr in supportedArgs() ? $set_expr : nothing)
+                elseif require
+                    # error when not supported by the backend
+                    :($keyexpr in supportedArgs() ? $set_expr : error("In recipe: required keyword ", $k, " is not supported by backend $(backend_name())"))
                 else
                     set_expr
                 end