world-class
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diff --git a/‎level-4/discrete-mathematics/student-notes/fabio-lama/build.sh
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diff --git a/‎level-4/discrete-mathematics/student-notes/fabio-lama/cheatsheet_binomial_coefficients.pdf
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diff --git a/‎level-4/discrete-mathematics/student-notes/fabio-lama/cheatsheet_equivalence.pdf
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diff --git a/‎level-4/discrete-mathematics/student-notes/fabio-lama/cheatsheet_functions.pdf
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diff --git a/‎level-4/discrete-mathematics/student-notes/fabio-lama/cheatsheet_graphs.pdf
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diff --git a/‎level-4/discrete-mathematics/student-notes/fabio-lama/cheatsheet_graphs_isomorphism.pdf
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diff --git a/‎level-4/discrete-mathematics/student-notes/fabio-lama/cheatsheet_logic_gates.pdf
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diff --git a/‎level-4/discrete-mathematics/student-notes/fabio-lama/cheatsheet_postulates_boolean_algebra.pdf
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diff --git a/‎level-4/discrete-mathematics/student-notes/fabio-lama/cheatsheet_relations.pdf
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@@ -0,0 +1,77 @@
+#!/bin/bash
+
+# Because `make` sucks.
+
+gen_html() {
+    # Remove suffix and prefix
+    FILE=$1
+    OUT=${FILE%.adoc}
+    HTML_OUT="cheatsheet_${OUT}.html"
+
+    asciidoctor $FILE -o ${HTML_OUT}
+}
+
+# Change directory to src/ in order to have images included correctly.
+cd "$(dirname "$0")/src/"
+
+case $1 in
+    html)
+        for FILE in *.adoc
+        do
+            # Generate HTML file.
+            gen_html ${FILE}
+        done
+
+        # Move up from src/
+        mv *.html ../
+        ;;
+    pdf)
+        for FILE in *.adoc
+        do
+            # Generate HTML file.
+            gen_html ${FILE}
+
+            # Convert HTML to PDF.
+            PDF_OUT="cheatsheet_${OUT}.pdf"
+            wkhtmltopdf \
+                --enable-local-file-access \
+                --javascript-delay 2000\
+                $HTML_OUT $PDF_OUT
+        done
+
+        # Move up from src/
+        mv *.pdf ../
+
+        # Cleanup temporarily generated HTML files.
+        rm *.html > /dev/null 2>&1
+        ;;
+    png | img)
+        for FILE in *.adoc
+        do
+            # Generate HTML file.
+            gen_html ${FILE}
+
+            # Convert HTML to PNG.
+            IMG_OUT="cheatsheet_${OUT}.png"
+            wkhtmltopdf \
+                --enable-local-file-access \
+                --javascript-delay 2000\
+                $HTML_OUT $IMG_OUT
+        done
+
+        # Move up from src/
+        mv *.png ../
+
+        # Cleanup temporarily generated HTML files.
+        rm *.html > /dev/null 2>&1
+        ;;
+    clean)
+        rm *.html > /dev/null 2>&1
+        rm *.png > /dev/null 2>&1
+        rm ../*.html > /dev/null 2>&1
+        rm ../*.png > /dev/null 2>&1
+        ;;
+    *)
+        echo "Unrecognized command"
+        ;;
+esac