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diff --git a/lib/filters/syntax-highlighting.sh b/lib/filters/syntax-highlighting.sh
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+#!/bin/sh
+# This script can be used to implement syntax highlighting in the cgit
+# tree-view by referring to this file with the source-filter or repo.source-
+# filter options in cgitrc.
+
+# Depends: cmark highlight
+
+# The following environment variables can be used to retrieve the configuration
+# of the repository for which this script is called:
+# CGIT_REPO_URL        ( = repo.url       setting )
+# CGIT_REPO_NAME       ( = repo.name      setting )
+# CGIT_REPO_PATH       ( = repo.path      setting )
+# CGIT_REPO_OWNER      ( = repo.owner     setting )
+# CGIT_REPO_DEFBRANCH  ( = repo.defbranch setting )
+# CGIT_REPO_SECTION    ( = section        setting )
+# CGIT_REPO_CLONE_URL  ( = repo.clone-url setting )
+
+# store filename and extension in local vars
+BASENAME="$1"
+EXTENSION="${BASENAME##*.}"
+
+[ "${BASENAME}" = "${EXTENSION}" ] && EXTENSION=txt
+[ -z "${EXTENSION}" ] && EXTENSION=txt
+
+# map Makefile and Makefile.* to .mk
+[ "${BASENAME%%.*}" = "Makefile" ] && EXTENSION=mk
+
+# map less common markdown extensions to .md
+case "$(printf '%s' "$EXTENSION" | tr '[:upper:]' '[:lower:]')" in
+	markdown|mdown|mkd|mdwn) EXTENSION=md;;
+esac
+
+case "$EXTENSION" in
+	md) exec cmark --safe;;
+	*) exec highlight --force -f -I -O xhtml -S "$EXTENSION" --ordered-list --line-number-ref=n 2>/dev/null;;
+esac