modified from git-guilt to show the line changes per file

git-victim.sh

#!/usr/bin/env bash

# make a temporary file
git_extra_mktemp() {
    mktemp -t "$(basename "$0")".XXXXXXX
}

for param in $*
do
    case $param in
        -h)
            echo 'Usage: git-victim [<options>] <since> <until>'
            echo 'Calculates the change of files in blame between two revisions'
            echo 'Example: git victim HEAD~3 HEAD'
            echo
            echo 'Options:'
            echo
            echo '  -h, --help               output usage information'
            echo '  -w, --ignore-whitespace  ignore whitespace only changes when attributing blame'
            echo '  -d, --debug              output debug information'
            exit 0
            ;;
        -w|--ignore-whitespace )
            NOT_WHITESPACE='-w'
            shift
            ;;
        -d|--debug )
            DEBUG=$(git_extra_mktemp)
            shift
            ;;
    esac
done

cd "$(git-root)" # cd for git blame
MERGED_LOG=$(git_extra_mktemp)
echo "$MERGED_LOG"
PATTERN='s/^filename //p'

for file in $(git diff --name-only "$@")
do
    MIME_TYPE=$(file -I $file | awk '{print $3}')
    if [[ $MIME_TYPE == "charset=binary" ]]; then
        continue
    fi

    test -n "$DEBUG" && echo "git blame $file"

    if [[ $MIME_TYPE == "charset=iso-8859-1" ]]; then
        # $1 - since $2 - until
        git blame $NOT_WHITESPACE --line-porcelain "$1" -- "$file" 2> /dev/null | 
            iconv -f ISO-8859-1 | sed -n "$PATTERN" | 
            sort | uniq -c | sed -E "s@^(.*) (.*)@+ \1 ${file}@" >> $MERGED_LOG
        # if $2 not given, use current commit as "until"
        git blame $NOT_WHITESPACE --line-porcelain "${2-@}" -- "$file" 2> /dev/null |
            iconv -f ISO-8859-1 | sed -n "$PATTERN" | 
            sort | uniq -c | sed -E "s@^(.*) (.*)@- \1 ${file}@" >> $MERGED_LOG
    else
        # $1 - since $2 - until
        git blame $NOT_WHITESPACE --line-porcelain "$1" -- "$file" 2> /dev/null | 
            sed -n "$PATTERN" | sort | uniq -c | sed -E "s@^(.*) (.*)@+ \1 ${file}@" >> $MERGED_LOG
        # if $2 not given, use current commit as "until"
        git blame $NOT_WHITESPACE --line-porcelain "${2-@}" -- "$file" 2> /dev/null |
            sed -n "$PATTERN" | sort | uniq -c | sed -E "s@^(.*) (.*)@- \1 ${file}@" >> $MERGED_LOG
    fi
done

DEBUG="$DEBUG" awk '
NR==1 {
    # the index of $2 does not change in each line
    name_start_at = index($0, $3)
}
/^\+/ {
    changes[substr($0, name_start_at)] += $2
}
/^-/ {
    changes[substr($0, name_start_at)] -= $2
}
END {
    for (filename in changes) {
        if (ENVIRON["DEBUG"]) {
           printf("%d %s\n", changes[filename], filename) >> ENVIRON["DEBUG"]
        }
        if (changes[filename] != 0) {
            printf("%d %s\n", changes[filename], filename)
        }
    }
}' $MERGED_LOG | sort -nr | # only gawk supports built-in sort function 
while read line
do
    filename=${line#* }
    num=${line%% *}
    len=${#num}
    sign="+"
    color="32m"
   
    if [[ $num -lt 0 ]]
    then
        sign="-"
        num=$((0-num))
        color="31m"
    fi

    printf "%-85s \033[00;${color}" "$filename"
    if [[ $num -ge 100 ]]
    then
        for (( i = 0; i < 48 - len; i++ ))
        do
            printf "$sign"
        done
    else
        for (( i = 0; i + 2 + len <= num/2; i++ ))
        do
            printf "$sign"
        done
    fi
    printf "(%s)" $num
    printf "\033[00m\n"
done

test -n "$DEBUG" && sort -nr "$DEBUG"

I was not seeing any author information when I tried running this - isn't the whole point of git-guilt to help you determine good code reviewers?