Gather emails by checking public repositories of a given user.

getGithubEmails.sh

function getGithubEmails() {
    username="$1"
    remove_fork="${2:-N}"
    if [ -z $ZSH_VERSION ]; then
        printf "$(hostname): Oops, this script requires zsh! \n$(whoami): Why?\n$(hostname): Well... there are some problems, one of them is https://stackoverflow.com/q/59289355 \n$(whoami): You convinced me, how can I install zsh? \n$(hostname): https://itsfoss.com/zsh-ubuntu/ or https://github.com/ohmyzsh/ohmyzsh/wiki/Installing-ZSH\n"
        return
    fi

    function checkRateLimit() {
        if $(printf "%s" "$1" | grep -q 'rate limit'); then
            printf "[*] GitHub API has reached the rate limit, you can wait a few minutes, change your IP address or modify this code to use an API token.\n" >&2
            return 2
        fi
    }
    message=$(curl -s "https://api.github.com/users/$username/repos?page=1&per_page=100")
    repos=( $(printf "%s" "$message" | jq -r '.[] | .name' 2>/dev/null || exit 2) )
    if [ $? = 2 ]; then
        checkRateLimit "$message"
        if [ $? != 2 ]; then
            printf "[-] Something is wrong, the API is returning:\n"
            printf "$message" | jq
        fi
        return
    fi
    if [ "$remove_fork" != "N" ] && [ "$remove_fork" != "n" ] && [ "$remove_fork" != "0" ];then
        repos=( $(printf "%s" "$message" | jq -r '.[] | select (.fork != true) | .name') )
        printf "[*] Filtering forks\n"
    fi
    printf "[*] Found ${#repos[@]} public repositories\n\n"
    allEmails=()
    for repo in "${repos[@]}"; do
        printf "https://github.com/$username/$repo\n"
        currentEmails=()
        function findEmails() {
            commits="$(curl -s https://api.github.com/repos/$username/$repo/commits)"
            checkRateLimit "$commits"
            [ $? = 2 ] && return
            set -o pipefail
            printf "%s" "$commits" | jq '.[] | .commit' 2> /dev/null | jq '.author,.committer' | jq -r '.name + ":" + .email' | sort -u
        }
        function appendArray() {
            while read; do currentEmails+=("$REPLY"); done
        }
        
        set -o pipefail
        (findEmails || ([ $? = 2 ] && break) ) | appendArray 
    
        printf '%s\n' "${currentEmails[@]}" | sed 's/^/\t/g'
        allEmails+=( $currentEmails )
    done
    printf '\n\n[!] Final results:\n'
    printf '%s\n' "${allEmails[@]}" | sort -u |  grep -Ev 'users.noreply.github.com|noreply@github.com'
}