#!/bin/ksh
#Site build script
#vim: set colorcolumn=81 ft=sh:hi ColorColumn ctermbg=224 "------
# Due to ambiguity in the markup format, you probably intended to
# go to a link labeled "$/build.sh". This is really a link to
# "$/build.sh.txt" in the unformatted post. Here is a proper
# link: <a href=/build.sh.txt>$&#47;build.sh.txt</a>. This was
# fixed in this document through a hack I'm not particularly
# proud of.
txt2html() {
	# cut off the modeline and title
	tail -n +3 |

	# convert lines starting with `##` to comments
	sed 's|^\(##.*\)$|<span id=d>\1</span>|' |
	# convert <,> to HTML-compatible format
	sed 's|<|\&lt;|g' |
	sed 's|>|\&gt;|g' |
	# convert italics to html
	sed 's|\*{|<em>|g' |
	sed 's|}\*|</em>|g' |
	# convert bold to html
	sed 's|&{|<b>|g' |
	sed 's|}&|</b>|g' |
	# convert codeblocks into css-ified codeblocks
	sed 's|``[`]{|<pre id=c>|' |
	sed 's|}[`]``|</pre>|' |
	# convert inline codeblocks into css-ified codeblocks
	sed 's|`[{]|<span id=c>|g' |
	sed 's|[}]`|</span>|g' |
	# See next comment. $/url.txt -> /url.html
	sed 's|\([$]/\)\([^ \)]*\)[.]txt\([,.]\)|<a href=/\2.html>\1\2</a>\3|g' |
	sed 's|\([$]/\)\([^ \)<>]*\)[.]txt|<a href=/\2.html>\1\2</a>|g' |
	# convert `$/url` to html links relative to root domain
	#sed 's|\([$]/\)\([^ \)]*\)\([,.]\)|<a href=/\2>\1\2</a>\3|g' |
	sed 's!^\([$]/\)\([^ \)<>]*\)!<a href=/\2>\1\2</a>!g;s!\([^>]\)\([$]/\)\([^ \)<>]*\)!\1<a href=/\3>\2\3</a>!g' |
	# See next comment. %/url.txt -> url.html
	sed 's|\(%/\)\([^ \)]*\)[.]txt\([,.]\)|<a href=\2.html>\1\2</a>\3|g' |
	sed 's|\(%/\)\([^ \)<>]*\)[.]txt|<a href=\2.html>\1\2</a>|g' |
	# convert `%/url` to html links relative to current directory
	sed 's!^\(%/\)\([^ \)<>]*\)!<a href=\2>\1\2</a>!g;s!\([^>]\)\(%/\)\([^ \)<>]*\)!\1<a href=\3>\2\3</a>!g' |
	# convert `#/url` to html links
	sed 's|\([#]/\)\([^ )]*\)\([,.)] \)|<a href=//\2>\1\2</a>\3|g' |
	sed 's|\([#]/\)\([^ )<>]*\)|<a href=//\2>\1\2</a>|g' |

	# convert `-[0-9]` into IDs
	sed 's|^\([ -]*\)\[\([0-9.][0-9.]*\)\]|\1<span id=section-\2>[\2]</span>|g' |
	# convert `[0-9]` into references to IDs
	sed 's|\([^\"#]\)\[\([0-9.][0-9.]*\)\]|\1[<a href=#section-\2>\2</a>]|g' |
	# convert `-{0-9}` into references to footnotes
	sed 's|^\(- [^{]*\){\([0-9]*\)}|\1{<a id=note-\2 href=#noteref-\2>\2</a>}|g' |
	# convert `{0-9}` into footnotes
	sed 's|{\([0-9]*\)}|{<a id=noteref-\1 href=#note-\1>\1</a>}|g' |

	# set content
	sed '/%%CONTENT%%/r /dev/stdin' html_template |
	sed '/%%CONTENT%%/d' |
	# set title
	sed "s|%%TITLE%%|${1:-Index}|"
}
{
	# process arguments if available, else all *.txt
	[ $# -eq 0 ] && find . -name '*.txt' | grep -ve 'robots.txt$' | tee /dev/stderr
	while [ ! $# -eq 0 ]; do
		case "$1" in
			sitemap*)
				shift
				break
				;;
		esac
		printf '%s\n' "$1"
		shift
	done
} | while read -r PAGE; do
	title=$(sed '2p;d' "$PAGE")
	printf 'txt2html %s\n' "$title"
	txt2html "$title" < "$PAGE" > "${PAGE%%.txt}.html"
	[ "$PAGE" = ./build.sh.txt ] && sed -i 's|&lt;|<|g;s|&gt;|>|g' "${PAGE%%.txt}.html"
done
find . -type f ! -name \*.gz | while read -r FILE; do
	yes | gzip -9k "$FILE" >/dev/null 2>&1
done
printf 'txt2html Sitemap\n'
find . -name '*.html' | cut -d/ -f2- | grep -ve ^sitemap[.]html\$ -e ^latest[.]html\$ | while read -r PAGE; do
	printf '<a href=/%s>$/%s</a>\n' "$PAGE" "$(sed '2p;d' "${PAGE%%.html}.txt")"
done |
	sed '/%%CONTENT%%/r /dev/stdin' html_template |
	sed '/%%CONTENT%%/d' |
	sed 's|%%TITLE%%|Sitemap|' > sitemap.html