Generates monthly Git reports

git-report.sh

#!/usr/bin/env bash
# Generates monthly Git reports
# Usage: `sh git-report.sh [ample]`

author=$(git config user.name)
ample=$(expr "$1" == 'ample')
date=$(date +%Y-%m-%d)
foretime=$(date +%Y-%m-01)
fullpath="$PWD"
target=reports/report-${date}

rm -rf ${target}
mkdir -p ${target}

function report {
  cname=$(git rev-parse --show-toplevel | xargs basename)
  cpath=${fullpath}/${target}/${cname}-${date}
  changelog=${cpath}.csv
  delta=${cpath}-diff.txt
  git log --all --author="$author" --date=short --no-merges --pretty=format:%h,%ae,%ad,%s, --reverse --shortstat --since=${foretime} | paste - - - | tr -d '\t' > ${changelog}
  if [[ ! -s ${changelog} ]]; then
    rm -f ${changelog}
  else
    git log --all --author="$author" --patch-with-raw --reverse --since=${foretime} > ${delta}
    if which 7z &> /dev/null; then
      (($ample)) \
      && git log --all --author="$author" --format='' --name-only --reverse --since=${foretime} \
      | xargs -n1 | sort -u | uniq -i | xargs -r 7z a -mx -t7z ${cpath}.7z ${changelog} ${delta} \
      || 7z a -mx -t7z ${cpath}.7z ${changelog} ${delta}
    else
      (($ample)) \
      && git log --all --author="$author" --format='' --name-only --reverse --since=${foretime} \
      | xargs -n1 | sort -u | uniq -i | xargs -r tar --ignore-failed-read -cJvf ${cpath}.tar.xz --directory ${cpath%/*} ${changelog##*/} ${delta##*/} --directory "$PWD" \
      || tar --ignore-failed-read -cJvf ${cpath}.tar.xz --directory ${cpath%/*} ${changelog##*/} ${delta##*/}
    fi
  fi
}

function traverse {
  if [[ -d '.git' ]]; then
    report
  else
    for dir in */; do
      if [[ -d "$dir" ]]; then
        pushd "$dir"
        traverse
        popd
      fi
    done
  fi
}

traverse