Git interactive rebase with changed files below commits

git-commit-file.php

#!/usr/bin/env php
<?php

//
// To use this file run this:
//     git config --global sequence.editor git-commit-file.php
//
// Then just:
//     git rebase -i develop
//

$core = trim(`git config core.editor`);
$commits = $_SERVER['argv'][1];

echo "Processing commits @ $commits\n";
$contents = file_get_contents($commits);
$contentLines = explode(PHP_EOL, $contents);

$changedLines = [];

foreach ($contentLines as $line) {
    $changedLines[] = $line;
    if (preg_match('/^pick ([^ ]+)/', $line, $m)) {
        $commit = $m[1];
        $diff = shell_exec("git diff --name-status $commit^..$commit | sed -e 's/\\t/  /' -e 's/^[A-Z]/         # \\0/'");
        $changedLines[] = $diff;
    }
}

$changedContents = implode(PHP_EOL, $changedLines);
file_put_contents($commits, $changedContents);

echo "Starting default editor $core\n";
exec("$core $commits > `tty`", $nothing, $exitCode);

echo "Exiting with code $exitCode\n";
exit($exitCode);