gitremotebranches

#!/bin/bash
#
# List remote branches with last commit info, sorted by author then recency.
# Optionally filter to branches whose last commit is at least N weeks old.

set -e

case "${1:-}" in
    -h|--help)
        echo "Usage: ${0##*/} [min_weeks]"
        exit 0 ;;
esac

min_weeks=${1:-0}
now=$(date +%s)
secs_per_week=604800

git for-each-ref --format='%(refname:short)' refs/remotes/ | while read -r branch; do
    IFS='|' read -r author timestamp age <<< "$(git log -1 --format='%an|%at|%ar' "$branch")"
    weeks_old=$(( (now - timestamp) / secs_per_week ))
    if [ "$weeks_old" -ge "$min_weeks" ]; then
        printf '%s|%s|%s|%s\n' "$author" "$timestamp" "$age" "$branch"
    fi
done | sort -t'|' -k1,1 -k2,2nr | {
    read -r first || exit 0
    printf '%-25s %-20s %s\n' "Author" "Age" "Branch"
    printf '%-25s %-20s %s\n' "------" "---" "------"
    printf '%s\n' "$first"
    cat
} | while IFS='|' read -r author timestamp age branch; do
    printf '%-25s %-20s %s\n' "$author" "$age" "$branch"
done