parse wiki notation to html tag

wiki2html.sh

#!/bin/sh

# line start with "h1. " title 1
# line start with "h2. " title 2
# !image_url!
# [link_description|link_address]
# line start with "* " is a list
# line start with "** " is a sub list

DEBUG=1

file=$1

list=0

while read -r line
do
    #echo "$line"

    #parse link
    line=$(echo "$line" | sed -e 's/\[\([^]|]*\)\(|\)\([^]]*\)\]/<a href=\"\3\">\1<\/a>/g')

    #parse image
    line=$(echo "$line" | sed -e 's/\!\([^!]*\)\!/<img src=\"\1\">/g')

    line=$(echo "$line" | sed -e 's/(?)//g')


    star=$(expr "$line" : "^\*\+ ")

    #trace("star:$star")

    (( star > 0 )) && {
        (( star - 1 == list )) && {
            echo "</li>"
        }
        (( star - 1 > list )) && {
            echo "<ul>"
            (( list=list+1 ))
        }
        (( star -1 < list )) && {
            echo "</li>"
            echo "</ul>"
            echo "</li>"
            (( list=list-1 ))
        }

        echo "<li>"${line:$star}
        continue
    }

    (( list > 0 )) && {
        echo "</li>"
        echo "</ul>"
        (( list=list-1 ))
    }

    head=$(expr "$line" : "^h[0-9]\. ")

    #echo "head"$head

    (( head > 0 )) && {
        echo "<"${line:0:2}">"${line:$head}"</"${line:0:2}">"
        continue
    }

    len=$(expr length "$line")
    (( len > 0 )) && {
        echo "<p>$line</p>"
    }
done < $file

(( list > 0 )) && {
    echo "</li>"
    echo "</ul>"
}

trace() {
    (( DEBUG == 1 )) && {
        echo $1
    }
}