checkout

#!/bin/bash

#Config

##Default length
LEN=5

##Default directory
DEFAULT_DIRECTORY=~/
#-- Uncomment the line below to enable default working directory --#
#cd $DEFAULT_DIRECTORY

#######################

POSITIONAL=()

for i in "$@"
do
case $i in
    -l|--length)
    LEN="$2"
    if [[ ! "$LEN" =~ ^[0-9]+$ ]]; then
	echo "please supply a number for the length"
	exit
    fi
    shift # past argument
    ;;
    *:*)    # unknown option
    POSITIONAL+=("$1") # save it in an array for later
    shift # past argument
    ;;
esac
done
set -- "${POSITIONAL[@]}" # restore positional parameters

if [ $# -eq 0 ]
  then
    echo "Usage: checkout [OPTION] PATH:LINENUMBER"
    exit
fi

DIR="$(cut -d':' -f1 <<< $1)"
LINE="$(cut -d':' -f2 <<< $1)"

if [[ ! -f "$DIR" ]]; then
	echo
	echo "\"$DIR\" is not a valid file-name"
	echo
    	echo "Usage: checkout [OPTION] PATH:LINENUMBER"
	echo "-------------------------------------------"
	echo
	echo "Options: -l, --length	number of lines printed above and below"
	echo
	exit
fi
	
if [[ ! "$LINE" =~ ^[0-9]+$ ]] ; then
	echo
	echo "\"$LINE\" is not a valid number"
    	echo	
	echo "Usage: checkout [OPTION] PATH:LINENUMBER"
	echo "-------------------------------------------"
	echo
	echo "Options: -l, --length	number of lines printed above and below"
	echo
	exit
fi


MIN=$(echo $(expr $LINE - $LEN) | sed -e 's/^-.*/1/' -e 's/^0/1/')
MAX=$(expr $LINE + $LEN)
cat -n $DIR | sed -n "$MIN,$MAX p" | ack --passthru " $LINE	"