Using git diff, how can I get added and modified lines numbers?

Question

Assuming I have a text file

alex
bob
matrix
will be removed
git repo

and I have updated it to be

alex
new line here
another         


        

Answer 1

Here's a bash function I cobbled together:

echo ${f}:
for n in $(git --no-pager blame --line-porcelain $1 |
        awk '/author Not Committed Yet/{if (a && a !~ /author Not Committed Yet/) print a} {a=$0}' |
        awk '{print $3}') ; do
    if (( prev_line > -1 )) ; then
        if (( "$n" > (prev_line + 1) )) ; then
            if (( (prev_line - range_start) > 1 )) ; then
                echo -n "$range_start-$prev_line,"
            else
                echo -n "$range_start,$prev_line,"
            fi
            range_start=$n
        fi
    else
        range_start=$n
    fi
    prev_line=$n
done
if (( "$range_start" != "$prev_line" )) ; then
    echo "$range_start-$prev_line"
else
    echo "$range_start"
fi

And it ends up looking like this:

views.py:
403,404,533-538,546-548,550-552,554-559,565-567,580-582