SVN log props counter. WordPress function to trawl the commits log and count props. Counts are more accurate after removing the array_reduce(). Still not totally accurate.

ww_svn_log_props.php

<?php
/**
 * List contributor props from most to least
 *
 * @param string $url (optional) The SVN repo URL.
 */
function ww_svn_log_props( $url = 'http://core.svn.wordpress.org/trunk' ) {
	$log = get_transient( '36_log' ); // 12 Hour transient
	if ( ! $log ) {
		$log = shell_exec( 'svn log -r 23171:HEAD --xml ' . esc_url( $url ) );
		set_transient( '36_log', $log, 12 * HOUR_IN_SECONDS );
	}

	$xml = simplexml_load_string( $log );

	$msgs = $matches = array();
	foreach ( $xml as $key => $entry ) {
		$msgs[] = (string) $entry->msg;
	}

	foreach ( $msgs as $msg ) {
		if ( preg_match( '/props.*/i', $msg, $matched ) );
		$matches = array_merge( $matches, $matched );
	}

	$names = get_transient( '36_log_names' ); // 12 Hour transient
	if ( ! $names ) {
		$names = array();
		foreach ( $matches as $match ) {
			// Remove 'props ' or '.' or 'for' or 'the' or 'initial' or 'patch' or 'starter' or 'trunk' or 'nudge'
			$name = str_ireplace( array( 'props ', '.', ';', 'to ', 'for ', 'the ', 'initial ', 'patch', 'starter', 'trunk', 'nudge' ), '', $match );

			// Removes 'fixes #123456' or 'see #123456'
			$name = preg_replace( '/((?:[a-z][a-z]+))(\\s+)(#)(\\d+)/is', '', $name );

			// Replaces 'and' with ', '
			$name = str_replace( ' and ', ',', $name );

			// Removes spaces at the last minute
			$name = str_replace( ' ', '', $name );

			if ( strpos( $name, ',' ) ) {
				$new_names = explode( ',', $name );
				foreach ( $new_names as $new_name )
					$names[] = $new_name;
			} else {
				$names[] = $name;
			}
		}
		set_transient( '36_log_names', $names, 12 * HOUR_IN_SECONDS );
	}

	$names_list = array_unique( $names );

	// The first time you run this, it may talk a lot of time
	// and a lot of processing power. Just sayin.
	$props = get_transient( '36_log_props' );
	if ( false == $props ) {
		$props = array();
		foreach ( $names_list as $name ) {
			if ( '' == $name )
				continue;
			$props[$name] = (int) shell_exec( 'svn log http://core.svn.wordpress.org/trunk -r 23171:HEAD | grep -i "props" | grep -ic "' . $name . '"' );
		}
		set_transient( '36_log_props', $props, HOUR_IN_SECONDS );
	}

	arsort( $props );

	foreach ( $props as $name => $count ) {
		echo $count . ' - ' . $name . '<br />';
	}
}

/* Outputs as:
### - Contributor
## - Contributor
... (high to low)
*/
ww_svn_log_props();