commits.php

<?php

function list_to_file( $list, $file ) {
	array_unshift( $list, array_keys( reset( $list ) ) ); // Append the keys to the top of the file.

	$csv_file = fopen( $file, 'w' );

	foreach ( $list as $fields ) {
		fputcsv( $csv_file, $fields );
	}

	fclose( $csv_file );
}


$log = [];

$format = [
	'commit' => '%h',
	'author' => '%an',
	'date' => '%ah',
	'message' => '%s',
];

$commit_key = 'commit';

$log_keys = array_keys( $format );

$command = sprintf(
	'git log --no-merges --shortstat --pretty=%s',
	escapeshellarg( sprintf( 'format:%s', implode( '%x09', $format ) ) ), // Seperate by tabs.
);

$log = shell_exec( $command );

$commits = [];

$log = explode( "\n\n", $log );

// Create an array of all data for each commit.
$log = array_map(
	function( $log_lines ) use ( $log_keys ) {
		list( $commit, $changes ) = explode( "\n", $log_lines );

		$commit = array_combine( $log_keys, explode( "\t", $commit ) );
		$changes = array_values( array_filter( explode( ' ', $changes ), 'is_numeric', ) );
		$changes = array_combine( [ 'changed', 'inserted', 'deleted' ], array_replace( [ 0, 0, 0 ], $changes ) );

		return array_merge( $commit, $changes );
	},
	$log
);

list_to_file( $log, 'commits-until.csv' );

$authors = array_unique( array_map(
	function ( $meta ) {
		return $meta['author'];
	},
	$log
) );

$range_start = floor( strtotime( end( $log )['date'] ) / 86400 ) * 86400;
$range_end = ceil( strtotime( reset( $log )['date'] ) / 86400 ) * 86400;

$dates = array_fill( 0, ( $range_end - $range_start ) / 86400, $range_start );

array_walk(
	$dates,
	function( &$value, $key ) {
		$value = $value + ( $key * 86400 );
	}
);

$by_author_by_dates = [];
$author_commits = array_combine( $authors, array_fill( 0, count( $authors ), 0 ) );

foreach ( $dates as $date ) {
	$date_data = array_merge(
		[
			'date' => date( 'r', $date ),
			'commits' => '',
		],
		$author_commits
	);

	$commits_for_day = array_filter(
		$log,
		function( $meta ) use ( $date ) {
			$commit_timestamp = strtotime( $meta['date'] );
			return ( $commit_timestamp >= $date && $commit_timestamp < $date + 86400 );
		}
	);

	foreach ( $commits_for_day as $commit ) {
		$date_data[ $commit['author'] ] += intval( $commit['changed'] );
		$date_data['commits'] .= sprintf( ',%s', $commit['commit'] );
	}

	$by_author_by_dates[] = $date_data;
}

list_to_file( $by_author_by_dates, 'commits-by-author.csv' );