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|
#!/bin/sh
# replace all * with _ for easier processing
#
_pre_emph () {
while IFS= read -r line; do
while [ "$line" != "${line%%\**}" ]; do
printf "%s_" "${line%%\**}"
line="${line#*\*}"
done
printf "%s\n" "${line}"
done
}
# fix any misaligned <em> and <strong> closign tags
#
_post_emph () {
while IFS= read -r line; do
# TODO: avoid this problem entirely?
local wrong="</strong></em>" right="</em></strong>"
while [ "$line" != "${line%%${wrong}*}" ]; do
printf "%s${right}" "${line%%${wrong}*}"
line="${line#*${wrong}}"
done
printf "%s\n" "${line}"
done
}
# parse emphasis in a line
#
# emph [bound] <lefttag> <righttag>
#
_emph () {
local bound="$1"
local lefttag="$2" righttag="$3"
while IFS= read -r line; do
next="${line}"
line=
rightofbold=
while [ "$next" != "${next#*${bound}}" ]; do
leftofbold="${next%%${bound}*}"
rightofbold="${next#$leftofbold${bound}*}"
bold="${rightofbold%%${bound}*}"
next="${rightofbold#*${bound}}"
printf "%s%s%s%s" "${leftofbold}" "${lefttag}" "${bold}" "${righttag}"
done
printf "%s\n" "${next}"
done
}
# parse heading
#
# h [heading no.]
_h () {
local num=$1
while IFS= read -r line; do
s=
n=$num
while [ "$n" -gt "0" ]; do
s="#$s"
n=$((n-1))
done
case "$line" in
"$s "*)
printf "<h$num>%s</h$num>\n" "${line#$s }"
;;
*)
printf "%s\n" "$line"
;;
esac
done
}
# parse paragraphs
#
# p
_p () {
empty=true
while IFS= read -r line; do
case "$line" in
"#"*)
printf "%s\n" "$line"
;;
"")
$empty ||
printf "</p>\n"
empty=true ;;
*)
$empty &&
printf "<p>%s " "$line" ||
printf "%s " "$line"
empty=false ;;
esac
done
$empty || {
printf "</p>\n"
}
}
# parse links
#
_a_img () {
local open="[" mid="](" close=")"
while IFS= read -r line; do
next="$line"
while [ "$next" != "${next#*$close}" ]; do
before="${next%%$open*}"
text=${next#*$open} text=${text%%$mid*}
url=${next#*$mid} url=${url%%$close*}
title=${url#* } url=${url%% *}
[ "$title" != "$url" ] \
&& title=" title=$title" \
|| title=
case "$before" in
*!) h="%s<img src=\"%s\"%s alt=\"%s\"></img>"
before="${before%!}" ;;
*) h="%s<a href=\"%s\"%s>%s</a>" ;;
esac
printf "$h" "$before" "$url" "$title" "$text"
next="${next#*$close}"
done
printf "%s\n" "$next";
done
}
# parse unordered lists
#
_ul () {
}
# parse ordered lists
#
_ol () {
}
# convert the markdown from stdin into html
#
md2html () {
_p \
| _pre_emph \
| _emph '__' "<strong>" "</strong>" \
| _emph '_' "<em>" "</em>" \
| _emph '`' "<code>" "</code>" \
| _post_emph \
| _a_img \
| _h 6 \
| _h 5 \
| _h 4 \
| _h 3 \
| _h 2 \
| _h 1
}
md2html
|
