savediff.sh

#!/bin/bash

PROJECTPATH=$1
PATHTOSAVE=$2

if [[ -z $PROJECTPATH ]]; then
    echo "no project path informed!"
    exit 1
fi

if [[ -z $PATHTOSAVE ]]; then
    echo "no path to save informed!"
    exit 1
fi

cd $PROJECTPATH

BRANCH=`git rev-parse --abbrev-ref HEAD | sed 's/\//--/'`

if [ ! -d $PATHTOSAVE$BRANCH ]; then
    mkdir -p $PATHTOSAVE$BRANCH
fi

CONTENT=`git diff --no-ext-diff --no-prefix`
TMPFILENAME="tmp.patch"
SAVE=1

if [[ ! -z $CONTENT ]]; then
    FILETOSAVE=$PATHTOSAVE$BRANCH"/"`date +'%Y-%m-%d_%H-%M-%S'`".patch"
    TMPFILE=$PATHTOSAVE$BRANCH"/"$TMPFILENAME
    echo $CONTENT > $TMPFILE
    for FILE in `ls $PATHTOSAVE$BRANCH`
    do
        if [ $FILE != $TMPFILENAME ]; then
            DIFF=`diff $PATHTOSAVE$BRANCH"/"$FILE $TMPFILE`
            if [[ -z $DIFF ]]; then
                SAVE=0
            fi
        fi
    done
    if [ $SAVE == 1 ]; then
        echo $CONTENT > $FILETOSAVE
    fi
    rm $TMPFILE
fi

*/3 * * * * /path/to/savediff.sh /path/to/project/ /path/to/save/