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#!/bin/bash

function psg()
{
    /bin/ps aux | grep -v 'grep' |grep -i $1
}

function len()
{
    string=$1
    echo ${#string}
}


function pgrep() {
    ps aux | grep -v grep  | grep -i $1
}

function pkill() {
    local pid
    pid=$(ps ax | grep $1 | grep -v grep | awk '{ print $1 }')
    kill -9 $pid
    echo -e "Killed $1 (process $pid)\n"
}


#safe remove, mv the files to .Trash with unique name
#and log the acction
function rm()
{
    if [ -d $HOME/.local/share/Trash/files ];then
        trash="$HOME/.local/share/Trash/files"
    else
        trash="$HOME/.Trash"
    fi

    log="" #/var/log/trash.log"
    stamp=`date "+%Y-%m-%d %H:%M:%S"` #current time

    while [ -f "$1" ] || [ -d "$1" ]; do

        #remove the possible ending /
        file=`echo $1 |sed 's#\/$##' `

        pure_filename=`echo $file  |awk -F / '{print $NF}' |sed -e "s#^\.##" `

        if [ `echo $pure_filename | grep "\." ` ]; then
            new_file=` echo $pure_filename |sed -e "s/\([^.]*$\)/$RANDOM.\1/" `
        else
            new_file="$pure_filename.$RANDOM"
        fi

        trash_file="$trash/$new_file"
        mv "$file" "$trash_file"

        if [ -w $log ]; then
            echo -e "[$stamp]\t$file\t=>\t[$trash_file]" |tee -a $log
        else
            echo -e "[$stamp]\t$file\t=>\t[$trash_file]"
            echo 'not writeble log file'
        fi

        shift   #increment the loop
    done
}

function mountiso()
{
    sudo umount -f /media/cdrom
    sudo mount -o loop -t iso9660 "$1" /media/cdrom
}


function pt() {
    # to check if a port has been used
    if [ $# -lt 1 ]; then
	echo "Usage: pt <PortNumber> #to check if a port has been used"
	return
    fi
    sudo lsof -i :$*
}

function md(){
    #make dir and enter
    if [ -f "$1" ] ; then
        echo "File $1 exists~"
        return
    fi
    if [ ! -d "$1" ] ;then
        mkdir -p "$1"
        cd "$1"
    else
        echo "$1 exists~"
    fi
}

function tt() {
    #compress on file/folder to *.tgz
    filename=`echo "$1" | sed -e 's@/$@@' `".tgz"
    tar czvf $filename "$1"
}

function xx() {
   if [ -f $1 ] ; then
       case $1 in
        *.tar.bz2)      tar xvjf $1  ;;
        *.tar.gz)       tar xvzf $1  ;;
        *.tar.xz)       tar Jxvf $1  ;;
        *.bz2)          bunzip2 $1  ;;
        *.rar)          unrar x $1  ;;
        *.gz)           gunzip $1  ;;
        *.tar)          tar xvf $1  ;;
        *.tbz2)         tar xvjf $1 ;;
        *.tgz)          tar xvzf $1 ;;
        *.zip)          unzip $1  ;;
        *.Z)            uncompress $1  ;;
        *.7z)           7z x $1 ;;
        *)              echo "don't know how to extract '$1'..." ;;
       esac
   else
       echo "'$1' is not a valid file!"
   fi
}

function upper() { echo ${@^^}; }
function lower() { echo ${@,,}; }

#sudo kill pkill
function k() {
    cfm=Y
    if [ ! -z "$1" ]; then
        if [[ ! -z "$1" ]]; then
            /bin/ps aux | grep -v grep | grep -i "$1"
            read -p "killall? [Yn]" cfm
            case $cfm in
                '')
                    /bin/ps aux |grep -v grep | grep -i "$1" |awk '{print $2}' |xargs sudo kill -9
                    ;;
                'Y')
                    /bin/ps aux |grep -v grep | grep -i "$1" |awk '{print $2}' |xargs sudo kill -9
                    ;;
                'y')
                    /bin/ps aux |grep -v grep | grep -i "$1" |awk '{print $2}' |xargs sudo kill -9
                    ;;
                *)
                    echo "aborted..."
                    ;;
            esac
        else
            echo "no such process."
        fi
    fi
}


function rand()
{
    #provide a 16-digit random string

    options='abc'
    option_count=${#options}
    length=16
    choice=$((RANDOM % option_count))
    chosen=${options:choice:1}
    function a()
    {
	#the length must be divided by 2
	openssl rand -hex $((length / 2 ))
    }

    function b(){
	#a trailing '; echo' is required for line break
	#by @Gokuu (http://fanfou.com/Gokuu)
	head /dev/urandom | xxd -p | head -c $length; echo
    }

    function c()
    {
	#by @bitstream (http://fanfou.com/wangcong)
	printf "%04x%04x%04x%04x" $RANDOM $RANDOM $RANDOM $RANDOM
    }

    #the core of this function
    $chosen

}

c()
{
    #an one-liner caculator
    bc <<EOF
scale=3
$*
EOF

}


#caculate the md5sum of a folder
function md5folder()
{
    limitSize='104857600' #100M
    path=$1
    tmpmd5=$(mktemp md5sum.XXXXXX)
    for file in `find $path| grep -v "\.git"`
        do
            if [ -f $file ]
            then
                cat $file >>$tmpmd5
            fi
        done
    md5sum $tmpmd5 | grep -oP "\b[a-f\d]{8}(?=[a-z\d]{24}\b)"
    rm -f $tmpmd5
}


function hc(){
    # one-liner caculator, with result in hexadecimal.
    if [ $# -gt 0 ]; then
	python -c "print '''0x%x''' % ($*)"
    else
	echo "Usage: $FUNCNAME <math expression>  #caculator in hex"
    fi
}


function isgd()
{
    url="$1"
    if [ $# -gt 0 ]; then
	shorten=`curl -s "http://is.gd/create.php?format=simple&logstats=1&url=$url"`
	echo $shorten
	echo $shorten | pbcopy #save to clipboard
    else
	echo "Usage: $FUNCNAME <URL_TO_SHORTEN>"
    fi
}

#show full path of an file/folder
full() {
    local i;for i in $*;do readlink -f $i;done
}

#convert epoch seconds to Date
sec2date(){
    sec="$1"
    if [ $# -gt 0 ]; then
	date=`date -d "@$sec" +"%Y-%m-%d %H:%M:%S +0800"`
	echo $date
	echo $date |tr -d "\n" |pbcopy
    else
	echo "Usage: $FUNCNAME <SECONDS>"
    fi
}