From 9cba87405672413505495969bd989d563ff3f7ae Mon Sep 17 00:00:00 2001
From: Maximilian HUEBL <maximilian.huebl@ist.ac.at>
Date: Sun, 25 Aug 2024 20:51:01 +0200
Subject: [PATCH] fix latexify on complex expressions

---
 src/latexify_recipes.jl         | 6 ++++--
 test/latexify.jl                | 1 +
 test/latexify_refs/complex4.txt | 3 +++
 3 files changed, 8 insertions(+), 2 deletions(-)
 create mode 100644 test/latexify_refs/complex4.txt

diff --git a/src/latexify_recipes.jl b/src/latexify_recipes.jl
index b056252fb..2b42953d1 100644
--- a/src/latexify_recipes.jl
+++ b/src/latexify_recipes.jl
@@ -168,7 +168,9 @@ function _toexpr(O)
             end
         end
 
-        if isempty(numer) || !isone(abs(m.coeff))
+        if !isreal(m.coeff)
+            numer_expr = Expr(:call, :*, m.coeff, numer...)
+        elseif isempty(numer) || !isone(abs(m.coeff))
             numer_expr = Expr(:call, :*, abs(m.coeff), numer...)
         else
             numer_expr = length(numer) > 1 ? Expr(:call, :*, numer...) : numer[1]
@@ -181,7 +183,7 @@ function _toexpr(O)
             frac_expr = Expr(:call, :/, numer_expr, denom_expr)
         end
 
-        if m.coeff < 0
+        if isreal(m.coeff) && m.coeff < 0
             return Expr(:call, :-, frac_expr)
         else
             return frac_expr
diff --git a/test/latexify.jl b/test/latexify.jl
index 9480adc91..d5249abc8 100644
--- a/test/latexify.jl
+++ b/test/latexify.jl
@@ -53,6 +53,7 @@ Dy = Differential(y)
 @test_reference "latexify_refs/complex1.txt" latexify(x^2-y^2+2im*x*y)
 @test_reference "latexify_refs/complex2.txt" latexify(3im*x)
 @test_reference "latexify_refs/complex3.txt" latexify(1 - x + (1+2x)*im; imaginary_unit="\\mathbb{i}")
+@test_reference "latexify_refs/complex4.txt" latexify(im * Symbolics.Term(sqrt, [2]))
 
 @test_reference "latexify_refs/indices1.txt" latexify(h[10,10])
 @test_reference "latexify_refs/indices2.txt" latexify(h[10,10], index=:bracket)
diff --git a/test/latexify_refs/complex4.txt b/test/latexify_refs/complex4.txt
new file mode 100644
index 000000000..d7a210d25
--- /dev/null
+++ b/test/latexify_refs/complex4.txt
@@ -0,0 +1,3 @@
+\begin{equation}
+\mathit{i} \sqrt{2}
+\end{equation}