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#!/bin/sh
md2html() {
# Usage:
# md2html file.md > file.html
# Options: -v esc=false to not escape html
awk '
function newblock(nblock) {
if (text)
print "<" block ">" text "</" block ">"
text = ""
block = nblock ? nblock : "p"
}
function subinline(tgl, inl) {
while (match($0, tgl)){
if (inline[ni] == inl)
ni -= sub(tgl, "</" inl ">")
else if (sub(tgl, "<" inl ">"))
inline[++ni] = inl
}
}
function dolink(href, lnk) {
# Undo escaped html in uris
gsub(/&/, "\\&", href)
gsub(/</, "<", href)
gsub(/>/, ">", href)
# & can be tricky, and not standard:
gsub(/&/, "\\\\\\&", href)
gsub(/&/, "\\\\\\&", lnk)
return "<a href=\"" href "\">" lnk "</a>"
}
BEGIN {
ni = 0; # inlines
nl = 0; # nested lists
text = ""
block = "p"
}
# Escape html
esc != "false" {
gsub("&", "\\&")
gsub("<", "\\<")
gsub(">", "\\>")
}
# Horizontal rules (_ is not in markdown)
/^[ ]*([-*_] ?)+[ ]*$/ && text == "" {
print "<hr>"
next
}
# Tables (not in markdown)
# Syntax:
# Right Align| Center Align |Left Align
/([ ]\|)|(\|[ ])/ {
if (block != "table")
newblock("table")
nc = split($0, cells, "|")
$0 = "<tr>\n"
for (i = 1; i <= nc; i++){
align = "left"
if (sub(/^[ ]+/, "", cells[i])){
if (sub(/[ ]+$/, "", cells[i]))
align = "center"
else
align = "right"
}
sub(/[ ]+$/,"", cells[i])
$0 = $0 "<td align=\"" align "\">" cells[i] "</td>\n"
}
$0 = $0 "</tr>"
}
# Ordered and unordered (possibly nested) lists
/^[ ]*([*+-]|(([0-9]+[\.-]?)+))[ ]/ {
newblock("li")
nnl = 1
while (match($0, /^[ ]/)){
sub(/^[ ]/,"")
nnl++
}
while (nl > nnl)
print "</" list[nl--] ">"
while (nl < nnl){
list[++nl] = "ol"
if (match($0, /^[*+-]/))
list[nl] = "ul"
print "<" list[nl] ">"
}
sub(/^([*+-]|(([0-9]+[\.-]?)+))[ ]/,"")
}
# Multi line list items
block == "li" {
sub(/^( *)|( *)/,"")
}
# Code blocks
/^( | )/ {
if (block != "code")
newblock("code")
sub(/^( | )/, "")
text = text $0 "\n"
next
}
# Paragraphs
/^$/ {
newblock()
while (nl > 0)
print "</" list[nl--] ">"
}
# Headers
/^#/ {
newblock()
match($0, /#+/)
n = RLENGTH
if (n > 6)
n = 6
text = substr($0, RLENGTH + 1)
block = "h" n
next
}
# Alternate headers (underlined)
/^=+$/ {
block = "h" 1
next
}
/^-+$/ {
block = "h" 2
next
}
{
# Images
while (match($0, /!\[[^\]]+\]\([^\)]+\)/)){
split(substr($0, RSTART, RLENGTH), a, /(!\[)|\)|(\]\()/)
sub(/!\[[^\]]+\]\([^\)]+\)/, "<img src=\"" a[3] "\" alt=\"" a[2] "\">")
}
# Links
while (match($0, /\[[^\]]+\]\([^\)]+\)/)){
split(substr($0, RSTART, RLENGTH), a, /[\[\)]|(\]\()/)
sub(/\[[^\]]+\]\([^\)]+\)/, dolink(a[3], a[2]))
}
# Auto links (uri matching is poor)
na = split($0, a, /(^\()|[ ]|([,\.\)]([ ]|$))/)
for (i = 1; i <= na; i++)
if (match(a[i], /^(((https?|ftp|file|news|irc):\/\/)|(mailto:)).+$/))
sub(a[i], dolink(a[i], a[i]))
# Inline
subinline("(\\*\\*)|(__)", "strong")
subinline("\\*", "em")
subinline("`", "code")
text = text (text ? " " : "") $0
}
END {
while (ni > 0)
text = text "</" inline[ni--] ">"
newblock()
while (nl > 0)
print "</" list[nl--] ">"
}' "$@"
}
genhtml() (
. ./meta
cd "$1" || return
. ./meta
exec 1>index.html
# Header
cat <<- EOT
<!doctype html>
<html lang="${lang:-en}">
<title>$title</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<link rel="stylesheet" href="/style.css">
EOT
# Body
[ "$1" != . ] && echo "<a href=\"..\">$blog_title</a><hr>"
# pandoc *.md
md2html *.md
# Footer
[ "$1" = . ] && return
echo "<hr>From: $author, $date. <a href=\"mailto:marc@vertes.org?subject=$(urlenc "Re: $link/${PWD##*/}")\">Feedback</a>"
)
urlenc() {
while [ -n "$1" ]; do
set -- "${1#?}" "${1%${1#?}}"
case $2 in
([-._~0-9A-Za-z]) printf %c "$2" ;;
(*) printf %%%02x "'$2" ;;
esac
done
echo
}
for d in *; do
[ -d "$d" ] && genhtml "$d"
done
genhtml .
# Put a license in index footer.
echo '<footer>
<hr>
<a href="feed.xml">RSS feed</a>.     Licensed under
<a href="http://creativecommons.org/licenses/by/4.0/">CC BY 4.0</a>.
</footer>' >>index.html
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