From 33b7fbaa9ec3f8e9f9d9f82f438ef45ff3dd18e6 Mon Sep 17 00:00:00 2001
From: Alexander Wang <alex@terrastruct.com>
Date: Sun, 27 Nov 2022 22:52:48 -0800
Subject: [PATCH] 2022-11-27 10:52:48PM

---
 d2renderers/d2latex/latex.go      | 7 +++++--
 d2renderers/d2latex/latex_test.go | 7 +++++++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/d2renderers/d2latex/latex.go b/d2renderers/d2latex/latex.go
index 574a8f4ed..2de4ae670 100644
--- a/d2renderers/d2latex/latex.go
+++ b/d2renderers/d2latex/latex.go
@@ -9,6 +9,7 @@ import (
 	"regexp"
 	"strconv"
 
+	"oss.terrastruct.com/xdefer"
 	v8 "rogchap.com/v8go"
 )
 
@@ -23,7 +24,8 @@ var mathjaxJS string
 
 var svgRe = regexp.MustCompile(`<svg[^>]+width="([0-9\.]+)ex" height="([0-9\.]+)ex"[^>]+>`)
 
-func Render(s string) (string, error) {
+func Render(s string) (_ string, err error) {
+	defer xdefer.Errorf(&err, "latex failed to parse")
 	v8ctx := v8.NewContext()
 
 	if _, err := v8ctx.RunScript(polyfillsJS, "polyfills.js"); err != nil {
@@ -49,7 +51,8 @@ func Render(s string) (string, error) {
 	return val.String(), nil
 }
 
-func Measure(s string) (width, height int, _ error) {
+func Measure(s string) (width, height int, err error) {
+	defer xdefer.Errorf(&err, "latex failed to parse")
 	svg, err := Render(s)
 	if err != nil {
 		return 0, 0, err
diff --git a/d2renderers/d2latex/latex_test.go b/d2renderers/d2latex/latex_test.go
index 7f87ef742..134184f84 100644
--- a/d2renderers/d2latex/latex_test.go
+++ b/d2renderers/d2latex/latex_test.go
@@ -21,3 +21,10 @@ func TestRender(t *testing.T) {
 		}
 	}
 }
+
+func TestRenderError(t *testing.T) {
+	_, err := Render(`\frac{1}{2}`)
+	if err == nil {
+		t.Fatal(err)
+	}
+}