#!/bin/bash

function check_version() {
    local need_version=$1
    local install_version=$2
    local back='\e[0m'
    local red='\e[1;31m'
    local green='\e[1;32m'

    if [ "$install_version" = "$need_version" ]; then
        echo -e "\tinstall: $install_version$green\t[MATCH]$back"
    else
        if [[ "$install_version" > "$need_version" ]]; then
            echo -e "\tinstall: $install_version$green\t[OK]$back"
        else
            echo -e "\tinstall: $install_version$red\t[FAILED]$back"
        fi
    fi
}

function check_package() {
    local name=$1
    echo -n "check $1..."
    local cmd=$2
    local need_version=$(echo $name | cut -d'-' -f2)
    local ver_length=$(echo $need_version | tr -cd '.' | wc -c)
    if [ "$ver_length" = 1 ]; then
       check_version "$need_version" $($cmd | grep -o '[0-9]\+\.[0-9]\+')
    else
       check_version "$need_version" $($cmd | grep -o '[0-9]\+\.[0-9]\+\.[0-9]\+')
    fi
}

function check_pack(){
    check_package "$1" "$2 --version"
}

echo "Check Host System Requirements For LFS 6.3"
echo -e "\t\t----------by adie(http://www.adintr.com)"
echo -e "\t\t----------script version 1.0"

check_pack 'Bash-2.05a' 'bash'
check_pack 'Binutils-2.12' 'ld'
check_pack 'Bison-1.875' 'bison'
bzip2 --version  2>&1 < /dev/null | head -n1 > bzip.version
check_package 'Bzip2-1.0.2' 'cat bzip.version'
rm bzip.version
check_pack 'Coreutils-5.0' 'chown'
check_pack 'Diffutils-2.8' 'diff'
check_pack 'Findutils-4.1.20' 'find'
check_pack 'Gawk-3.0' 'gawk'
check_pack 'Gcc-3.0.1' 'gcc'
check_package 'Glibc-2.2.5' '/lib/libc.so.6'
check_pack 'Grep-2.5' 'grep'
check_pack 'Gzip-1.2.4' 'gzip'
check_package 'Linux Kernel-2.6' 'cat /proc/version'
check_pack 'Make-3.79' 'make'
check_pack 'Patch-2.5.4' 'patch'
check_pack 'Sed-3.0.2' 'sed'
check_pack 'Tar-1.14' 'tar'