#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: $/build.sh.txt. 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|^\(##.*\)$|\1|' |
	# convert <,> to HTML-compatible format
	sed 's|<|\<|g' |
	sed 's|>|\>|g' |
	# convert italics to html
	sed 's|\||g' |
	sed 's|}\*||g' |
	# convert bold to html
	sed 's|||g' |
	sed 's|||g' |
	# convert codeblocks into css-ified codeblocks
	sed 's|``[`]{|
|' |
	sed 's|}[`]``|
|' |
	# convert inline codeblocks into css-ified codeblocks
	sed 's|`[{]||g' |
	sed 's|[}]`||g' |
	# See next comment. $/url -> /url.html
	sed 's|\([$]/\)\([^ \)]*\)[.]txt\([,.]\)|\1\2\3|g' |
	sed 's|\([$]/\)\([^ \)<>]*\)[.]txt|\1\2|g' |
	# convert `$/url` to html links relative to root domain
	#sed 's|\([$]/\)\([^ \)]*\)\([,.]\)|\1\2\3|g' |
	sed 's!^\([$]/\)\([^ \)<>]*\)!\1\2!g;s!\([^>]\)\([$]/\)\([^ \)<>]*\)!\1\2\3!g' |
	# See next comment. %/url -> url.html
	sed 's|\(%/\)\([^ \)]*\)[.]txt\([,.]\)|\1\2\3|g' |
	sed 's|\(%/\)\([^ \)<>]*\)[.]txt|\1\2|g' |
	# convert `%/url` to html links relative to current directory
	sed 's!^\(%/\)\([^ \)<>]*\)!\1\2!g;s!\([^>]\)\(%/\)\([^ \)<>]*\)!\1\2\3!g' |
	# convert `#/url` to html links
	sed 's|\([#]/\)\([^ )]*\)\([,.)] \)|\1\2\3|g' |
	sed 's|\([#]/\)\([^ )<>]*\)|\1\2|g' |

	# convert `-[0-9]` into IDs
	sed 's|^\([ -]*\)\[\([0-9.][0-9.]*\)\]|\1[\2]|g' |
	# convert `[0-9]` into references to IDs
	sed 's|\([^\"#]\)\[\([0-9.][0-9.]*\)\]|\1[\2]|g' |
	# convert `-{0-9 into references to footnotes
	sed 's|^\(- [^{]*\){\([0-9]*\)}|\1{\2}|g' |
	# convert 0-9 into footnotes
	sed 's|{\([0-9]*\)}|{\1}|g' |

	# set content
	sed '/%%CONTENT%%/r /dev/stdin' html_template |
	sed '/%%CONTENT%%/d' |
	# set title
	sed "s|#Site build script|${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|<|<|g;s|>|>|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 '>$/%s\n' "$PAGE" "$(sed '2p;d' "${PAGE%%.html}.txt")"
done |
	sed '/%%CONTENT%%/r /dev/stdin' html_template |
	sed '/%%CONTENT%%/d' |
	sed 's|#Site build script|Sitemap|' > sitemap.html