#!/cmd/rc

# sed -n \
#     -e '/#{{/{x; /^$/{x;b}; s/''/''''/g; s/\$[$a-zA-Z0-9()#"]\+[\^]\?/''&''/g; s/^\n/echo ''/ ; s/$/''/; p; x; h; b}' \
#     -e H \
#     -e '/#}}/{s/#}}//; x; s/#{{//; s/#}}//; p; g}' \
#     -e '${x; /^$/{b}; /#}}/!{s/''/''''/g; s/\$[$a-zA-Z0-9()#"]\+[\^]\?/''&''/g; s/^\n/echo ''/ ; s/$/''/; p}}' \
# | rc

sed '/^$/{s//echo/; b}; /^#! /{s/#! //g; b}; /^#! /!{s/''/''''/g; s/\$\(#\|"\)\?[$a-zA-Z0-9_]\+\(([$a-zA-Z0-9#_]\+)\)\?[\^]\?/''&''/g; s/^/echo ''/ ; s/$/''/; b}'