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diff --git a/usr/lib/cgit/filters/about-formatting-edited.sh b/usr/lib/cgit/filters/about-formatting-edited.sh
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+++ b/usr/lib/cgit/filters/about-formatting-edited.sh
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+#!/bin/sh
+
+# This may be used with the about-filter or repo.about-filter setting in cgitrc.
+# It passes formatting of about pages to differing programs, depending on the usage.
+
+# Markdown support requires python and markdown-python.
+# RestructuredText support requires python and docutils.
+# Man page support requires groff.
+
+# 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 )
+
+case "$(printf '%s' "$1" | tr '[:upper:]' '[:lower:]')" in
+	*.markdown|*.mdown|*.md|*.mkd) exec cmark;;
+#	*.rst) exec ./html-converters/rst2html;;
+	*.[1-9]) exec ./html-converters/man2html;;
+	*.htm|*.html) exec cat;;
+	*.txt|*) exec ./html-converters/txt2html;;
+esac