#!/bin/zsh

if [[ -z "$1" ]]; then exit 0; fi;

git fetch
git remote prune origin &>/dev/null

ACTION=$1
CURRENT_USER_EMAIL=""
if [[ "true" == "$2" ]]; then CURRENT_USER_EMAIL=$(git config user.email); fi;
MAIN_BRANCH=$(git symbolic-ref refs/remotes/origin/HEAD | sed 's@^refs/remotes/origin/@@')

TARGET_BRANCHES=$(
    {
        git branch -vv | grep 'origin/.*: gone]';
        git branch -vv | grep '\[origin/.*\]' | grep -v 'ahead\|behind';
    } |
    awk '{print $1}' | sort -u | while read branch; do
        if [[ "$branch" == "$MAIN_BRANCH" ]]; then
            continue;
        elif [[ -z $CURRENT_USER_EMAIL ]]; then
            echo "$branch"
        elif git log --format='%ae' "${MAIN_BRANCH}..${branch}" | grep -v -F -q "$CURRENT_USER_EMAIL"; then
            echo "$branch"
        fi;
    done
)

case "$ACTION" in
    print)
        echo "$TARGET_BRANCHES" | while read branch; do
            if [[ -z "$branch" ]]; then continue; fi;
            if [[ "*" == "$branch" ]]; then; continue; fi
            info=$(git log -1 --format='%cr|%s' "$branch")
            ahead=$(git rev-list --count "$MAIN_BRANCH..$branch")
            echo "$branch | +$ahead | $info"
        done | column -t -s '|'
        ;;
    nuke)
        if [[ -z "$CURRENT_USER_EMAIL" ]]; then exit 1; fi;
        echo "$TARGET_BRANCHES" | xargs git branch -D
        ;;
esac