fix: inline latex math display in pdfs generated from ipynb

Gemfile

@@ -34,6 +34,7 @@ group :development, :test, :staging do
   gem 'faker'
   gem 'minitest'
   gem 'minitest-around'
+  gem 'pdf-reader'
   gem 'webmock'
 end
 

Gemfile.lock

@@ -1,6 +1,7 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    Ascii85 (1.1.0)
     actioncable (7.0.4.3)
       actionpack (= 7.0.4.3)
       activesupport (= 7.0.4.3)
@@ -69,6 +70,7 @@ GEM
     addressable (2.8.1)
       public_suffix (>= 2.0.2, < 6.0)
     aes_key_wrap (1.1.0)
+    afm (0.2.2)
     amq-protocol (2.3.2)
     ast (2.4.2)
     backport (1.2.0)
@@ -170,6 +172,7 @@ GEM
     grape-swagger-rails (0.3.1)
       railties (>= 3.2.12)
     hashdiff (1.0.1)
+    hashery (2.1.2)
     hirb (0.7.3)
     http-accept (1.7.0)
     http-cookie (1.0.5)
@@ -242,6 +245,12 @@ GEM
     parallel (1.22.1)
     parser (3.2.1.1)
       ast (~> 2.4.1)
+    pdf-reader (2.11.0)
+      Ascii85 (~> 1.0)
+      afm (~> 0.2.1)
+      hashery (~> 2.0)
+      ruby-rc4
+      ttfunk
     pkg-config (1.5.1)
     public_suffix (5.0.1)
     puma (6.1.1)
@@ -340,6 +349,7 @@ GEM
     ruby-filemagic (0.7.3)
     ruby-ole (1.2.12.2)
     ruby-progressbar (1.13.0)
+    ruby-rc4 (0.1.5)
     ruby-saml (1.13.0)
       nokogiri (>= 1.10.5)
       rexml
@@ -384,6 +394,7 @@ GEM
     thor (1.2.1)
     tilt (2.1.0)
     timeout (0.3.2)
+    ttfunk (1.7.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
     unf (0.1.4)
@@ -436,6 +447,7 @@ DEPENDENCIES
   moss_ruby (>= 1.1.4)
   mysql2
   net-smtp
+  pdf-reader
   puma
   rack-cors
   rails (~> 7.0)

app/views/layouts/application.pdf.erbtex

@@ -13,7 +13,7 @@
     \input|"python3 jupynotex.py #2 #1"
 }
 
-\usepackage[fencedCode,hashEnumerators]{markdown}
+\usepackage[fencedCode,hashEnumerators,pipeTables,texMathDollars]{markdown}
 
 \usepackage{luatextra}
 \defaultfontfeatures{Ligatures=TeX}

test/models/task_test.rb

@@ -357,9 +357,19 @@ def test_ipynb_to_pdf
     assert File.exist? path
     assert File.exist? task.final_pdf_path
 
+    # Check inline latex math display
+    pdf_content = read_pdf_content(task.final_pdf_path)
+    assert_includes pdf_content, "bmi =     weigh2\n                                           height"
+
     td.destroy
     assert_not File.exist? path
     unit.destroy!
   end
 
+  def read_pdf_content(pdf_path)
+    require 'pdf-reader'
+    pdf_reader = PDF::Reader.new(pdf_path)
+    pdf_reader.pages.map(&:text).join("\n")
+  end
+
 end

test_files/submissions/vectorial_graph.ipynb

@@ -937,6 +937,20 @@
    "source": [
     "Testing a raw cell with $10 invalid latex code"
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Testing inline latex math display"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Formula for calculating BMI: $\\text{bmi}=\\frac{\\text{weight}}{\\text{height}^2}$"
+   ]
   }
  ],
  "metadata": {