functions

#
# Extract an archive of any type
#
extract(){
    if [ $# -lt 1 ]
    then
        echo Usage: extract file
        return 1
    fi
    if [ -f $1 ] ; then
        case $1 in
            *.tar.bz2)   tar xvjf $1    ;;
            *.tar.gz)    tar xvzf $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       ;;
            *.war|*.jar) 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
}

#
# Swap two files
#
swap(){
    if [ $# -ne 2 ]
    then
        echo Usage: swap file1 file2
        return 1
    fi
    local TMPFILE=tmp.$$
    mv "$1" $TMPFILE
    mv "$2" "$1"
    mv $TMPFILE "$2"
}

#
# fast find, using globstar
#
ff(){
    ls -ltr **/$@
}

# Trivial command line calculator using awk's bult-in floating-point arithmetic expressions:
function calc
{
    awk "BEGIN {print \"The answer is: \" $* }";
}

# Make directory and change to it at the same time
mdir () { mkdir -p "$@" && cd "$@"; }

# wgetall
function wgetall () { 
wget -r -l3 -nd -Nc -A.$@ $@ 
}

# cs to cd and then ls
function cs () {
	clear
	# only change directory if a directory is specified
	[ -n "${1}" ] && cd $1
	# filesystem stats
	echo "`df -hT .`"
	echo ""
	echo -n "[`pwd`:"
	# count files
	echo -n " <`find . -maxdepth 1 -mindepth 1 -type f | wc -l | tr -d '[:space:]'` files>"
	# count sub-directories
	echo -n " <`find . -maxdepth 1 -mindepth 1 -type d | wc -l | tr -d '[:space:]'` dirs/>"
	# count links
	echo -n " <`find . -maxdepth 1 -mindepth 1 -type l | wc -l | tr -d '[:space:]'` links@>"
	# total disk space used by this directory and all subdirectories
	echo " <~`du -sh . 2> /dev/null | cut -f1`>]"
	ROWS=`stty size | cut -d' ' -f1`
	FILES=`find . -maxdepth 1 -mindepth 1 |
	wc -l | tr -d '[:space:]'`
	# if the terminal has enough lines, do a long listing
	if [ `expr "${ROWS}" - 6` -lt "${FILES}" ]; then
		ls -ACF
	else
		ls -hlAF
	fi
}

# do an ls after every successful cd
function cd {
    builtin cd "$@" && ls
}

# recursive mkdir and cd if successful
function mkcd {
    mkdir -p "$@" && builtin cd "$@"
}

# Start an HTTP server from a directory, optionally specifying the port
function server() {
    local port="${1:-8000}"
    open "http://localhost:${port}/"
	# Set the default Content-Type to `text/plain` instead of `application/octet-stream`
	# And serve everything as UTF-8 (although not technically correct, this doesn’t break anything for binary files)
    python -c $'import SimpleHTTPServer;\nmap = SimpleHTTPServer.SimpleHTTPRequestHandler.extensions_map;\nmap[""] = "text/plain";\nfor key, value in map.items():\n\tmap[key] = value + ";charset=UTF-8";\nSimpleHTTPServer.test();' "$port"
}

# cp progress bar
cp_p()
{
    strace -q -ewrite cp -- "${1}" "${2}" 2>&1 \
        | awk '{
        count += $NF
            if (count % 10 == 0) {
               percent = count / total_size * 100
               printf "%3d%% [", percent
               for (i=0;i<=percent;i++)
                  printf "="
               printf ">"
               for (i=percent;i<100;i++)
                  printf " "
               printf "]\r"
            }
         }
         END { print "" }' total_size=$(stat -c '%s' "${1}") count=0
}