wordcount.sh

#!/bin/bash
#
# author: Bastian Rieck
# ammended: Mathew Lipson
# source: http://bastian.rieck.ru/blog/posts/2017/counting_words_git/
#
# This script traverses all commits of a git repository in the current directory
# (if it exists) and counts the number of words that are changed, i.e. added or 
# deleted for all TeX files. The output contains a time-stamp (YYYY-MM-DD). Next, 
# there are some counts, viz. the number of added, deleted, and total words.
#
# Use 'branch' in order to control for which branch the commits are being enumerated.

branch="master"
words=0

if [ -f log_wordcount.txt ] ; then
	rm log_wordcount.txt
fi

if [ -d .git ]; then  # list commits after initial 104
	for commit in $(git rev-list --reverse $branch | tail -n +104)
	do
	  date=$(git show -s --format=%ci $commit)
	  added=$(git show -p --word-diff=porcelain $commit "*.md" | grep -e '^+[^+]' | wc -w)
	  deleted=$(git show -p --word-diff=porcelain $commit "*.md" | grep -e '^-[^-]' | wc -w)
	  
	  words=$(($words+$added))
	  words=$(($words-$deleted))
	  
	  echo $date $added $deleted $words
	  echo $date $words >> log_wordcount.txt
	done

	python plot_wordcount.py
else
	echo "not a git repository"
fi