Added the ability to toggle the latex printin on and off.

Author: fremling

README.md

@@ -132,6 +132,10 @@ julia> P12 * [W"a" W"b" ; W`a+b` 2] == [ W"b" 2-W"b" ; W"a" W"b"]
 true
 ```
 
+## LateX printing in JuPyter Notebooks
+Printing in Juypter notebooks is by defaults done in latex.
+This can be turned off with the command `MathLink.set_texOutput(false)`
+
 ## Notes
 
 - Mathematica, Wolfram, MathLink are all trademarks of Wolfram Research.

src/display.jl

@@ -10,6 +10,18 @@ function Base.show(io::IO, ::MIME"image/png", w::MathLink.WExpr)
 end
 
 
+####If the flag for tex-output evaluation does not exist
+## create it and set it to true.
+if !@isdefined(MLtexOutput)
+    MLtexOutput=true
+end
+
+export set_texOutput
+function set_texOutput(x::Bool)
+    global MLtexOutput
+    MLtexOutput=x
+end
+
 export HasGraphicsHead, HasRecursiveGraphicsHead, W2Tex
 
 
@@ -62,10 +74,14 @@ function HasGraphicsHead(w::MathLink.WExpr)
 end
 
 import Base.show
+Base.Multimedia.showable(::MIME"text/latex", w::MathLink.WSymbol) = MLtexOutput
 Base.show(io,::MIME"text/latex",x::MathLink.WSymbol) = print(io,"\$"*W2Tex(x)*"\$")
 
 import Base.Multimedia.showable
 function Base.Multimedia.showable(::MIME"text/latex", w::MathLink.WExpr)
+    if !MLtexOutput
+        return false
+    end
     if HasRecursiveGraphicsHead(w)
         return false
     else

test/runtests.jl

@@ -3,6 +3,8 @@ using Test
 
 import MathLink: WExpr, WSymbol
 
+
+
 @testset "integers" begin
     w = W"Factorial"(30)
     @test_throws MathLink.MathLinkError weval(Int, w)
@@ -206,19 +208,28 @@ end
     @test HasRecursiveGraphicsHead(weval(W`{Plot[x,{x,0,1}],Plot[x^2,{x,0,1}]}`))
 end
 
+
+
 @testset "W2Tex - LaTex conversion" begin
     @test W2Tex(W`(a+b)^(b+x)`) == "(a+b)^{b+x}"
     @test W2Tex(W`a`) == "a"
     @test W2Tex(W`ab`) == "\\text{ab}"
     @test W2Tex(W`ab*cd`) == "\\text{ab} \\text{cd}"
 
+   
     ###Testing that MIME form exists for the text/latex option of show.
     io = IOBuffer();
-    show(IOContext(io, :limit => true, :displaysize => (10, 10)),
-         "text/plain",W"a")
+    ioc = IOContext(io, :limit => true, :displaysize => (10, 10)) 
+    show(ioc,"text/plain",W"a")
     @test String(take!(io)) == "W\"a\""
-    show(IOContext(io, :limit => true, :displaysize => (10, 10)),
-         "text/plain",W"a"+W"b")
+    show(ioc,"text/plain",W"a"+W"b")
     @test String(take!(io)) == "W\"Plus\"(W\"a\", W\"b\")"
+
+    set_texOutput(true)
+    show(ioc,"text/latex",W"a"+W"b")
+    @test String(take!(io)) == "\$a+b\$"
+    @test showable("text/latex",W"a"+W"b")
+    set_texOutput(false)
+    @test !showable("text/latex",W"a"+W"b")
 end