#!/bin/sed -f

# headlines
s/^\* \+\(.*\)$/== \1 ==/
s/^\*\* \+\(.*\)$/=== \1 ===/
s/^\*\*\* \+\(.*\)$/==== \1 ====/
s/^\*\*\*\* \+\(.*\)$/===== \1 =====/
s/^\*\*\*\*\* \+\(.*\)$/====== \1 ======/

# links
s/\[\[\(.*\)\]\[\(.*\)\]\]/[\1 \2]/

# description lists
s/^- \+\([^:]\+\)::\(.*\)$/; \1:\2/
s/^ \+//

# lists
s/^- \+\(.*\)$/* \1/
s/^ \{2\}- \+\(.*\)$/** \1/
s/^ \{4\}- \+\(.*\)$/*** \1/
s/^[1-9]\+\. \+\(.*\)$/# \1/
s/^ \{2\}[1-9]\+\. \+\(.*\)$/## \1/
s/^ \{4\}[1-9]\+\. \+\(.*\)$/### \1/

# source code
s/^: \+\(.*\)$/ \1/

# emphasis, bold
s/\*\([^*]\+\)\*/'''\1'''/
s/ \/\([^/]\+\)\/ / ''\1'' /

# quotes
s/^#+BEGIN_QUOTE$/<blockquote>/
s/^#+END_QUOTE$/<\/blockquote>/

# comments
s/^#+.*$//

# tables
s/^|[-+]\+|$//
s/^|\([^|]*\)|$/|-\n|\1/
s/^|\([^|]*\)|\([^|]*\)|$/|-\n|\1||\2/
s/^|\([^|]*\)|\([^|]*\)|\([^|]*\)|$/|-\n|\1||\2||\3/
s/^|\([^|]*\)|\([^|]*\)|\([^|]*\)|\([^|]*\)|$/|-\n|\1||\2||\3||\4/