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#!/usr/bin/env sh
function err {
echo "$@" >&2
}
if [ $# -ne 1 ]; then
err "./gmi2html.sh /path/to/gmi"
exit 1;
fi
# main method
GMI=$1
list=0
pre=0
quote=0
while read line; do
# pre formatted text
if [ -n "$(sed -nE '/^[`]{3}/p' <<< $line)" ]; then
if [ $pre -eq 0 ]; then
echo "<pre>"
pre=1
else
echo "</pre>"
pre=0
fi
continue;
fi
if [ $pre -eq 1 ]; then
echo "$line"
continue;
fi
# lists
if [ -n "$(sed -nE '/^[*] .+/p' <<< "$line")" ]; then
if [ $list -eq 0 ]; then
echo "<ul>"
fi
list=1;
text=$(sed -E 's/^[*] (.+)$/\1/g' <<< "$line")
echo "<li>${text}</li>"
continue
else
if [ $list -eq 1 ]; then
echo "</ul>"
fi
list=0;
fi
# quotes
if [ -n "$(sed -nE '/^[>] .+/p' <<< $line)" ]; then
if [ $quote -eq 0 ]; then
echo "<figure><blockquote>"
fi
quote=1;
text=$(sed -E 's/^[>] (.+)$/\1/g' <<< $line)
echo "$text"
continue
else
if [ $quote -eq 1 ]; then
echo "</blockquote></figure>"
fi
quote=0;
fi
# single line modifiers
if [ -n "$(sed -nE '/^# .+/p' <<< $line)" ]; then
text=$(sed -E 's/^# (.+)$/\1/g' <<< $line)
echo "<h1>$text</h1>"
continue
fi
if [ -n "$(sed -nE '/^## .+/p' <<< $line)" ]; then
text=$(sed -E 's/^## (.+)$/\1/g' <<< $line)
echo "<h2>$text</h2>"
continue
fi
if [ -n "$(sed -nE '/^### .+/p' <<< $line)" ]; then
text=$(sed -E 's/^### (.+)$/\1/g' <<< $line)
echo "<h3>$text</h3>"
continue
fi
if [ -n "$(sed -nE '/^=> .+/p' <<< "$line")" ]; then
href=$(sed -E 's/^=> ([^ ]+)([ ]?.*)/\1/g' <<< "$line")
if [ -n "$(sed -nE '/^=> [^ ]+ .+$/p' <<< "$line")" ]; then
text=$(sed -E 's/^=> [^ ]+ (.+)$/\1/g' <<< "$line")
else
text=$href
fi
echo "<p><a href='${href}' rel='noopener' target='_blank'>$text</a></p>"
continue
fi
# skip blank lines
if [ -z "$line" ]; then
continue
fi
# default paragraphs
echo "<p>$line</p>"
done < $GMI
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