git-repo-cohesion

gistfile1.php

<?php

require_once('php-github-api/lib/phpGitHubApi.php');

$github = new phpGitHubApi();

$repositories = array(
    array('jquery', 'jquery'),
    array('madrobby', 'scriptaculous'),
    array('jashkenas', 'coffee-script'),
    array('yui', 'yui3'),
    array('sstephenson', 'prototype'),
    array('mootools', 'mootools-core') 
);

function array_slice_key($array, $key)
{
    return array_map(
        function($value) use ($key) { return $value[$key]; }, $array
    );
}

function array_keys_exists($keys, $array) 
{
    $subarray = $array;
    foreach ($keys as $key) {
        if (!array_key_exists($key, $subarray)) {
            return false;
        }
        $subarray = $subarray[$key];
    }

    return true;
}

function getContributorsCohesion($github, $repository_1, $repository_2)
{
    list($user_1, $reponame_1) = $repository_1;
    list($user_2, $reponame_2) = $repository_2;
    return count(array_intersect(
        array_slice_key($github->getRepoApi()->getRepoContributors($user_1, $reponame_1), 'login'),
        array_slice_key($github->getRepoApi()->getRepoContributors($user_2, $reponame_2), 'login')
    )); 
}

function getWatchersCohesion($github, $repository_1, $repository_2)
{
    list($user_1, $reponame_1) = $repository_1;
    list($user_2, $reponame_2) = $repository_2;
    return count(array_intersect(
        $github->getRepoApi()->getRepoWatchers($user_1, $reponame_1),
        $github->getRepoApi()->getRepoWatchers($user_2, $reponame_2)
    ));
}

function getRepositoryName($repository)
{
    return implode('/', $repository);
}

function printCohesion($cohesion)
{
    foreach ($cohesion as $repository_1 => $repositories) {
        foreach ($repositories as $repository_2 => $cohesionValue) {
            echo implode(',', array(
                $repository_1, 
                $repository_2,
                $cohesionValue
            )) . PHP_EOL;
        }
    }
}

$repoApi = $github->getRepoApi();

$watchersCohesion = array();
$contributorsCohesion = array();

foreach ($repositories as $repository_1) {
    $repository_1_name = getRepositoryName($repository_1);
    foreach ($repositories as $repository_2) {
        $repository_2_name = getRepositoryName($repository_2);
        if ($repository_1_name != $repository_2_name && 
            !array_keys_exists(array($repository_1_name, $repository_2_name), $watchersCohesion) &&
            !array_keys_exists(array($repository_2_name, $repository_1_name), $watchersCohesion)
        ) {
            $watchersCohesion[$repository_1_name][$repository_2_name] = 
                getWatchersCohesion($github, $repository_1, $repository_2); 
            $contributorsCohesion[$repository_1_name][$repository_2_name] =
                getContributorsCohesion($github, $repository_1, $repository_2); 
        }
    }
}

echo 'Watchers cohesion' . PHP_EOL;
printCohesion($watchersCohesion);
echo 'Contributors cohesion' . PHP_EOL;
printCohesion($contributorsCohesion);

?>