#!/usr/bin/env zsh

(($#<1)) && {
   print -- "usage: $0:t pattern"
   print -- "   generate a password using the ypassword method"
   print -- "   See http://ypassword.espozito.com for more informations"
} >&2

param="$*"
passfile="~/.passwd"
cmd="awk '\$1 ~ /$param/ {print;}'  < $passfile"
nblignes=$( eval $cmd | wc -l)

function col  {
    colnum=$1
    shift
    echo $* | awk "{print \$$colnum}"
}

if ((nblignes<1)); then
    echo "entrée non existante"
elif ((nblignes>1)); then
    echo "plusieur cas possibles : "
    eval $cmd | sort
else
    line="$(eval $cmd)"
    site=$( col 1 $line )
    domainName=$( echo $site | sed 's/.*\.\([^.]*\.[^.]*\)$/\1/')
    loginName=$( col 2 $line )
    longueur=$( col 3 $line )
    base64=$( col 4 $line )
    hashalgo=$( col 5 $line )
    num=$( col 6 $line )
    echo "Enter your master password please"
    echo -n "$site ($loginName): "
    oldmodes=$(stty -g)
    stty -echo
    read password
    stty $oldmodes

    if [[ -x =shasum ]]; then
        case $hashalgo in
        sha1)   hashcmd="shasum -a 1" ;;
        sha256) hashcmd="shasum -a 256" ;;
        sha512) hashcmd="shasum -a 512" ;;
        *)  print -- "Unknown algorithm: $hashalgo" >&2
            exit 1
        esac
    else
        case $hashalgo in
        sha1)   hashcmd="sha1sum" ;;
        sha256) hashcmd="sha256sum" ;;
        sha512) hashcmd="sha512sum" ;;
        *)  print -- "Unknown algorithm: $hashalgo" >&2
            exit 1
        esac
    fi

    if [[ $base64  = "b64" ]]; then
        # make a hex2b64
        hashcmd="$hashcmd | cut -f1 -d\\ | xxd -r -p | base64"
    fi

    cmd='echo -n "'$password$num$domainName'" | '$hashcmd' | awk "{print substr(\$1,1,'$longueur');}"'
    eval $cmd
fi