Fix latexify

Author: YingboMa

src/direct.jl

@@ -250,7 +250,7 @@ function toexpr(O; canonicalize=true)
     if op isa Differential
         ex = toexpr(args[1]; canonicalize=canonicalize)
         wrt = toexpr(op.x; canonicalize=canonicalize)
-        return :(Differential($wrt)($ex))
+        return :(_derivative($ex, $wrt))
     elseif op isa Sym
         isempty(args) && return nameof(op)
         return Expr(:call, toexpr(op; canonicalize=canonicalize), toexpr(args; canonicalize=canonicalize)...)

src/latexify_recipes.jl

@@ -13,14 +13,14 @@ prettify_expr(expr::Expr) = Expr(expr.head, prettify_expr.(expr.args)...)
     rhs = getfield.(eqs, :rhs)
     rhs = prettify_expr.(toexpr(rhs; canonicalize=false))
     rhs = [postwalk(x -> x isa Expr && length(x.args) == 1 ? x.args[1] : x, eq) for eq in rhs]
-    rhs = [postwalk(x -> x isa Expr && x.args[1] == :derivative && length(x.args[2].args) == 2 ? :($(Symbol(:d, x.args[2]))/($(Symbol(:d, x.args[2].args[2])))) : x, eq) for eq in rhs]
-    rhs = [postwalk(x -> x isa Expr && x.args[1] == :derivative ? "\\frac{d\\left($(Latexify.latexraw(x.args[2]))\\right)}{d$(Latexify.latexraw(x.args[3]))}" : x, eq) for eq in rhs]
+    rhs = [postwalk(x -> x isa Expr && x.args[1] == :_derivative && length(x.args[2].args) == 2 ? :($(Symbol(:d, x.args[2]))/($(Symbol(:d, x.args[2].args[2])))) : x, eq) for eq in rhs]
+    rhs = [postwalk(x -> x isa Expr && x.args[1] == :_derivative ? "\\frac{d\\left($(Latexify.latexraw(x.args[2]))\\right)}{d$(Latexify.latexraw(x.args[3]))}" : x, eq) for eq in rhs]
 
     lhs = getfield.(eqs, :lhs)
     lhs = prettify_expr.(toexpr(lhs; canonicalize=false))
     lhs = [postwalk(x -> x isa Expr && length(x.args) == 1 ? x.args[1] : x, eq) for eq in lhs]
-    lhs = [postwalk(x -> x isa Expr && x.args[1] == :derivative && length(x.args[2].args) == 2 ? :($(Symbol(:d, x.args[2]))/($(Symbol(:d, x.args[2].args[2])))) : x, eq) for eq in lhs]
-    lhs = [postwalk(x -> x isa Expr && x.args[1] == :derivative ? "\\frac{d\\left($(Latexify.latexraw(x.args[2]))\\right)}{d$(Latexify.latexraw(x.args[3]))}" : x, eq) for eq in lhs]
+    lhs = [postwalk(x -> x isa Expr && x.args[1] == :_derivative && length(x.args[2].args) == 2 ? :($(Symbol(:d, x.args[2]))/($(Symbol(:d, x.args[2].args[2])))) : x, eq) for eq in lhs]
+    lhs = [postwalk(x -> x isa Expr && x.args[1] == :_derivative ? "\\frac{d\\left($(Latexify.latexraw(x.args[2]))\\right)}{d$(Latexify.latexraw(x.args[3]))}" : x, eq) for eq in lhs]
 
     return lhs, rhs
 end