Do a git diffstat based on words (using git diff --word-diff and wc -w). Might break on merge commits!

git-word-stat.sh

#!/bin/bash

# Copyright (c) 2014 Jan-Philipp Litza <janphilipp@litza.de>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

set -eu

width=$(($(tput cols) - 49))
function scale_linear(){
    if [ $1 -eq 0 ]; then
        echo 0
    else
        echo $((1 + $1 * ($2 - 1) / $3 ))
    fi
}

GIT_ROOT="$(git rev-parse --show-toplevel)"
cd "$GIT_ROOT"

git diff --numstat "$@" | awk '{print $3}' | (
    declare -i removed=0 removed_file=0
    declare -i added=0   added_file=0
    declare -i filecount=0
    while read file; do
        removed_file=$(git diff --word-diff=porcelain "$@" -- "$file" | grep -Po '(?<=^-).([^-].*)?$' | tr -cd 'a-zA-Z ' | wc -w)
        added_file=$(  git diff --word-diff=porcelain "$@" -- "$file" | grep -Po '(?<=^\+).([^\+].*)?$' | tr -cd 'a-zA-Z ' | wc -w)
        removed=$(($removed + $removed_file))
        added=$(($added + $added_file))
        filecount=$(($filecount + 1))
        printf " %-40s | %4i " $file $(($removed_file + $added_file))
        if [ $(($added_file + $removed_file)) -ge $width ]; then
            total=$(scale_linear $(($added_file + $removed_file)) $width $(($added_file + $removed_file)))
            if [ $total -lt  2 ]; then
                total=2
            fi
            if [ $added_file -lt $removed_file ]; then
                added_file=$(scale_linear $added_file $width $(($added_file + $removed_file)))
                removed_file=$(($total - $added_file))
            else
                removed_file=$(scale_linear $removed_file $width $(($added_file + $removed_file)))
                added_file=$(($total - $removed_file))
            fi
        fi
        echo -en "\e[32m"
        for i in $(seq 1 $added_file); do
            echo -n "+"
        done
        echo -en "\e[31m"
        for i in $(seq 1 $removed_file); do
            echo -n "-"
        done
        echo -e "\e[m"
    done
    echo " ${filecount} file(s) changed, ${added} word insertions(+), ${removed} word deletions(-)"
)