calculate-changed-lines.sh

#!/bin/bash
# in ~/.gitconfig
# [alias]
#        lines = !~/bin/calculate-changed-lines.sh

RED='\033[0;31m'
GREEN='\033[0;32m'
NC='\033[0m'

CURRENT_REPO_PATH=$(git rev-parse --show-toplevel)
CURRENT_BRANCH=$(git rev-parse --abbrev-ref HEAD)

printf "Repo:   ${CURRENT_REPO_PATH}\n"
printf "Branch: ${CURRENT_BRANCH}\n"

REMOVED=$(git diff master | grep "^-" | grep -v "^---" | wc -l | sed -e 's/[[:space:]]//g')
ADDED=$(git diff master | grep "^+" | grep -v "^+++" | wc -l | sed -e 's/[[:space:]]//g')
TOTAL=$((REMOVED + ADDED))

printf "${GREEN}+${ADDED} added${NC}, ${RED}-${REMOVED} removed${NC} (${TOTAL} total)\n"