gitDiff

#!/bin/bash
#
# A command to look for a Dependencies directory and then
# run git diff for each file listed.
#

THECOMMAND=$1
THEOPTION=$2
THEDATE=`date`

if [ -z "${THECOMMAND}" ]
then
    echo
    echo "Usage : gitDiff root_file [N]"
    echo 
    echo "      'root_file' is the file in the Depenencies/ folder to scan"
    echo "      for files to then display with the git difftool command."
    echo 
    echo "      If you specify the 'N' parameter (actually anything other then 'D' or 'd')"
    echo "      then 'git difftool' will not be called."
    echo
    echo "Copyright - Robert C. Welsh, 2012"
    echo
    exit
fi

GITTHERE=`which git`

if [ -z "${GITTHERE}" ] 
then
    echo
    echo "You need to have git installed."
    echo
    exit 0
fi

if [ -z "${THEOPTION}" ]
then
    THEOPTION=D
fi

if [ "${THEOPTION}" == "d" ]
then
    THEOPTION=D
fi

echo
echo "Running checks at ${THEDATE} for the command : ${THECOMMAND}"
echo "-----------------------------------------------------------------------------"

if [ ! -d Dependencies ] 
then
    echo 
    echo "I can't find the Depedencies/ directory"
    echo
    exit 0
fi

if [ ! -e ${THECOMMAND} ]
then
    echo 
    echo "The command ${THECOMMAND} does not exist."
    echo
    exit 0
fi

if [ ! -e Dependencies/${THECOMMAND} ]
then
    echo 
    echo "I can't find the dependencies file for ${THECOMMAND}"
    echo
    exit 0
fi

for FILE in `cat Dependencies/${THECOMMAND}`
do
    if [ ! -e $FILE ]
    then
	echo 
	echo "File $FILE does not exist"
	echo
    else
	echo 
	echo -n "Checking $FILE "
	GITSTATUS=`git status HEAD $FILE | grep -e "${FILE}" | awk '{print $2}' | awk -F: '{print $1}'`
	if [ "${GITSTATUS}" == "new" ] 
	then
	    echo new
	else
	    if [ -z  "${GITSTATUS}" ]
	    then
		echo stable
	    else
		echo modified
		if [ "${THEOPTION}" == "D" ]
		then
		    git difftool -y HEAD $FILE
		fi
	    fi
	fi
    fi
done

echo