Better git diff for branches which had stuff merged in

giterdun.sh

# Example:
#
# giterdun 339f7db..6ed04fa
# git diff | $EDITOR
# BRANCH=`git rev-parse --abbrev-ref HEAD` && git checkout . && git checkout master && git branch -D $BRANCH

giterdun()
{
    RANGE=$1
    SHAS=`git log --no-merges --first-parent --pretty=%h --reverse $RANGE`
    if [ $? -ne 0 ]; then
        return 1
    fi

    BEGIN=`echo $RANGE | sed 's/\.\..*$//'`
    END=`echo $RANGE | sed 's/^.*\.\.//'`
    BRANCH=`uuidgen`

    echo "Branching $BRANCH off $BEGIN..."
    git checkout -q $BEGIN
    git checkout -qb $BRANCH

    for SHA in $SHAS; do
        echo "Applying $SHA..."
        git show -p $SHA | git apply
        if [ $? -ne 0 ]; then
            git show -p $SHA
        fi
    done
}