Move conditional loading of IJulia to outside include. This fixes #45…

…, due to JuliaLang/julia#8501. Should now be working on 0.4.

src/IJulia.jl

@@ -1,79 +1,76 @@
 # IJulia hooks for displaying plots with RCall
+import IPythonDisplay: InlineDisplay
 
-if isdefined(Main, :IJulia) && Main.IJulia.inited
-    import IPythonDisplay: InlineDisplay
+export rplot_set
 
-    export rplot_set
+const rplot_active = Bool[false]
+const rplot_file = tempname()
 
-    const rplot_active = Bool[false]
-    const rplot_file = tempname()
+const rplot_opts = Any[MIME"image/png"(),(480,400),()]
 
-    const rplot_opts = Any[MIME"image/png"(),(480,400),()]
+@doc """
+Set options for R plotting with IJulia.
 
-    @doc """
-        Set options for R plotting with IJulia.
+The first argument should be a MIME object: currently supported are 
+* `MIME("image/png")` [default]
+* `MIME("image/svg+xml")`
 
-        The first argument should be a MIME object: currently supported are 
-        * `MIME("image/png")` [default]
-        * `MIME("image/svg+xml")`
-
-        The remaining arguments are passed to the appropriate R graphics
-        device: see the relevant R help for details.
-    """->
-    function rplot_set(m::MIME,args...;kwargs...)
-        rplot_opts[1] = m
-        rplot_opts[2] = args
-        rplot_opts[3] = kwargs
-        nothing
-    end
-    rplot_set(m::MIME"image/png") = rplot_set(m,480,400)
-    rplot_set(m::MIME"image/svg+xml") = rplot_set(m,6,5)
+The remaining arguments are passed to the appropriate R graphics
+device: see the relevant R help for details.
+"""->
+function rplot_set(m::MIME,args...;kwargs...)
+    rplot_opts[1] = m
+    rplot_opts[2] = args
+    rplot_opts[3] = kwargs
+    nothing
+end
+rplot_set(m::MIME"image/png") = rplot_set(m,480,400)
+rplot_set(m::MIME"image/svg+xml") = rplot_set(m,6,5)
 
-    rplot_device(m::MIME"image/png") = :png
-    rplot_device(m::MIME"image/svg+xml") = :svg
+rplot_device(m::MIME"image/png") = :png
+rplot_device(m::MIME"image/svg+xml") = :svg
 
 
-    # open new png device
-    function new_rplot()
-        rcall(rplot_device(rplot_opts[1]),rplot_file,rplot_opts[2]...;rplot_opts[3]...)
-        rplot_active[1] = true
-    end
+# open new png device
+function new_rplot()
+    rcall(rplot_device(rplot_opts[1]),rplot_file,rplot_opts[2]...;rplot_opts[3]...)
+    rplot_active[1] = true
+end
 
-    function displayfile(m::MIME"image/png", f)
-        open(f) do f
-            d = read(f,UInt8,filesize(rplot_file))
-            display(InlineDisplay(),m,d)
-        end
+function displayfile(m::MIME"image/png", f)
+    open(f) do f
+        d = read(f,UInt8,filesize(rplot_file))
+        display(InlineDisplay(),m,d)
     end
-    function displayfile(m::MIME"image/svg+xml", f)
-        open(f) do f
-            d = readall(f)
-            display(InlineDisplay(),m,d)
-        end
+end
+function displayfile(m::MIME"image/svg+xml", f)
+    open(f) do f
+        d = readall(f)
+        display(InlineDisplay(),m,d)
     end
+end
 
-    # close and display png device
-    function disp_rplot()
-        if rplot_active[1]
-            rcall(symbol("dev.off"))
-            rplot_active[1] = false
-            if isfile(rplot_file)
-                displayfile(rplot_opts[1],rplot_file)
-                rm(rplot_file)
-            end
+# close and display png device
+function disp_rplot()
+    if rplot_active[1]
+        rcall(symbol("dev.off"))
+        rplot_active[1] = false
+        if isfile(rplot_file)
+            displayfile(rplot_opts[1],rplot_file)
+            rm(rplot_file)
         end
     end
+end
 
-    # cleanup png device on error
-    function clean_rplot()
-        if rplot_active[1]
-            rcall(symbol("dev.off"))
-            rplot_active[1] = false
-        end
-        isfile(rplot_file) && rm(rplot_file)
+# cleanup png device on error
+function clean_rplot()
+    if rplot_active[1]
+        rcall(symbol("dev.off"))
+        rplot_active[1] = false
     end
-
-    Main.IJulia.push_preexecute_hook(new_rplot)
-    Main.IJulia.push_postexecute_hook(disp_rplot)
-    Main.IJulia.push_posterror_hook(clean_rplot)
+    isfile(rplot_file) && rm(rplot_file)
 end
+
+Main.IJulia.push_preexecute_hook(new_rplot)
+Main.IJulia.push_postexecute_hook(disp_rplot)
+Main.IJulia.push_posterror_hook(clean_rplot)

src/RCall.jl

@@ -66,12 +66,14 @@ function __init__()
     global const unboundValue = sexp(unsafe_load(cglobal((:R_UnboundValue,libR),Ptr{Void})))
 end
 
-    include("types.jl")                 # define the various types of SEXPREC
-    include("sexp.jl")
-    include("iface.jl")
-    include("show.jl")
-    include("functions.jl")
-    include("library.jl")
-    include("IJulia.jl")
+include("types.jl")                 # define the various types of SEXPREC
+include("sexp.jl")
+include("iface.jl")
+include("show.jl")
+include("functions.jl")
+include("library.jl")
+
+# only if using IJulia
+isdefined(Main, :IJulia) && Main.IJulia.inited && include("IJulia.jl")
 
 end # module