Calculating Lines of Code Committed in a Repository

Recently I applied black python code formatter to a repository at work. I was the one to bite the bullet and format all existing files. I was curious to know how many files would be touched and how many lines would be changed.

Determining the Percent of Files Affected

# Count number of python files
find . -name '*.py' | wc -l

# Count python files in commit
git log @ -1 --stat -- '*.py'

For the repository in question, it was ~75% (~300/400 files). While writing this, I realize that quite a few of the files are possibly empty __init__.py files.

Determining User Contribution in Git Repository

I used this nifty one-liner from StackOverflow.

# Count of commits by author
git shortlog -s -n

# List of commits by author and add/remove line counts
git log --author="ipwnponies" --pretty=tformat: --numstat --no-merges

# Cumulative summation of line change counts
git log --author="ipwnponies" --pretty=tformat: --numstat --no-merges | gawk '
    { add += $1; subs += $2; loc += $1 - $2 }
    END { printf "added lines: %s removed lines: %s total lines: %s\n", add, subs, loc }
'

# Line count changes before formatting
git log --author="ipwnponies" --pretty=tformat: --numstat --no-merges @~ | gawk '
    { add += $1; subs += $2; loc += $1 - $2 }
    END { printf "added lines: %s removed lines: %s total lines: %s\n", add, subs, loc }
'

I had 32412 lines of code changed, and 46979 afterwards. This is a 45% increase in LOC changed!