updateCredits.php

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<?php
if ( PHP_SAPI != 'cli' ) {
    die( "This script can only be run from the command line.\n" );
}

$CREDITS = 'CREDITS';
$START_CONTRIBUTORS = '<!-- BEGIN CONTRIBUTOR LIST -->';
$END_CONTRIBUTORS = '<!-- END CONTRIBUTOR LIST -->';

$inHeader = true;
$inFooter = false;
$header = [];
$contributors = [];
$footer = [];

if ( !file_exists( $CREDITS ) ) {
    exit( 'No CREDITS file found. Are you running this script in the right directory?' );
}

$lines = explode( "\n", file_get_contents( $CREDITS ) );
foreach ( $lines as $line ) {
    if ( $inHeader ) {
        $header[] = $line;
        $inHeader = $line !== $START_CONTRIBUTORS;
    } elseif ( $inFooter ) {
        $footer[] = $line;
    } elseif ( $line == $END_CONTRIBUTORS ) {
        $inFooter = true;
        $footer[] = $line;
    } else {
        $name = substr( $line, 2 );
        $contributors[$name] = true;
    }
}
unset( $lines );

$lines = explode( "\n", shell_exec( 'git log --format="%aN"' ) );
foreach ( $lines as $line ) {
    if ( empty( $line ) ) {
        continue;
    }
    if ( substr( $line, 0, 5 ) === '[BOT]' ) {
        continue;
    }
    $contributors[$line] = true;
}

$contributors = array_keys( $contributors );
$collator = Collator::create( 'root' );
$collator->setAttribute( Collator::NUMERIC_COLLATION, Collator::ON );
$collator->sort( $contributors );
array_walk( $contributors, function ( &$v, $k ) {
    $v = "* {$v}";
} );

file_put_contents( $CREDITS,
    implode( "\n", array_merge( $header, $contributors, $footer ) ) );