git repo state analysis inspired by https://piechowski.io/post/git-commands-before-reading-code/

git-repo-analysis.sh

#!/usr/bin/env bash
set -eu

# DEBUG MODE
# set -x

# Usage after copying to PATH-able directory:
# cd into a git repository and run: git-repo-analysis.sh

HEADN=20
SINCE="1 year ago"

echo "Source: https://piechowski.io/post/git-commands-before-reading-code/"
echo
echo "-----"
echo "HEADN: $HEADN"
echo "SINCE: $SINCE"
echo "-----"
echo

echo "#########################"
echo "# What Changes the Most #"
echo "#########################"
git log --format=format: --name-only --since="$SINCE" \
    | sort | uniq -c | sort -nr | head -n "$HEADN"

echo
echo "##################"
echo "# Who Built This #"
echo "##################"
git shortlog -sn --no-merges | cat

echo
echo "#########################"
echo "# Where Do Bugs Cluster #"
echo "#########################"
git log -i -E --grep="fix|bug|broken" --name-only --format='' \
    | sort | uniq -c | sort -nr | head -n "$HEADN"

echo
echo "#########################################"
echo "# Is This Project Accelerating or Dying #"
echo "#########################################"
git log --format='%ad' --date=format:'%Y-%m' | sort | uniq -c

echo
echo "######################################"
echo "# How Often Is the Team Firefighting #"
echo "######################################"
git log --since="$SINCE" \
        --date=short \
        --pretty=format:'%ad %h %s' \
    | grep -iE 'revert|hotfix|emergency|rollback' | sort