get_num_contributors

#! /bin/bash

#
# get_num_contributors: get the number of contributors in a remote repo.
# currently only supports github and gitlab
#

#
# Check the command line args
#
if [ $# -ne 2 ]; then
   echo "usage: get_num_contributors: <host> <project>"
   echo "       supported hosts: github, gitlab, bitbucket"
   echo "           shortcuts: gh, gl, bb"
   echo "       example: get_num_contributors github openssl/openssl"
   echo "       example: get_num_contributors gitlab tortoisegit/tortoisegit"
   echo "       example: get_num_contributors bitbucket swsc/lookup"
   exit 1
fi

host=$1
proj=$2

#
# Use jq-linux64 if available, otherwise use jq
#
if which jq-linux64 >/dev/null; then
    JQ=jq-linux64
elif which jq >/dev/null; then
    JQ=jq
else
    echo "The jq command needed for this script is unavailable."
fi

#
# get the github API auth key(s) from ~/github-auth
#
if [ ! -f ~/github-auth ]; then
    echo Error: missing ~/github-auth file
    echo Error: missing ~/github-auth file >&2
    echo ~/github-auth must exists and contain github API auth key or keys >&2
    echo 'Create keys at github->Settings->Developer Settings->personal access tokens' >&2
    exit 1
fi
mapfile -t auth_array < ~/github-auth
len="${#auth_array[@]}"
i="$(($RANDOM % $len))"
auth=${auth_array[$i]}

#
# get the gitlab API auth key(s) from ~/gitlab-auth
#
if [ ! -f ~/gitlab-auth ]; then
    echo Error: missing ~/gitlab-auth file
    echo Error: missing ~/gitlab-auth file >&2
    echo ~/gitlab-auth must exists and contain gitlab API auth key or keys >&2
    echo 'Create keys at gitlab->User Settings>Access Tokens' >&2
    exit 1
fi
mapfile -t auth_array < ~/gitlab-auth
len="${#auth_array[@]}"
i="$(($RANDOM % $len))"
glauth=${auth_array[$i]}


#
# Main body of script
#
case $host in
    github|gh)
        response=$(curl -s -k -I -H "Authorization: token $auth" "https://api.github.com/repos/$proj/contributors?per_page=1" | sed -n '/^[Ll]ink:/ s/.*"next".*page=\([0-9]*\).*"last".*/\1/p')
        echo $response
        ;;
    gitlab|gl)
        proj=$(echo $proj | sed -e "s@/@%2F@")
        page=0
        total=0
        while true; do
            page=$((page + 1))
            url="https://gitlab.com/api/v4/projects/$proj/repository/contributors?per_page=100&page=$page"
            response=$(curl -s -H "PRIVATE-TOKEN: $glauth" "$url")
            if [[ "$response" = "[]" ]]; then
                break
            else
                contributors=$(echo "$response" | $JQ length)
                total=$((total + contributors))
            fi
        done
        echo $total
        ;;
    bitbucket|bb)
        echo "unknown (bitbucket)"
        ;;
    *)
        echo "unknown ($host)"
#        echo "Error: $host not supported, must be one of github, gitlab, or bitbucket"
        exit 1
esac

exit 0