diff --git a/run.php b/run.php
index ebdeabe..df9c051 100644
--- a/run.php
+++ b/run.php
@@ -4,11 +4,12 @@ declare(strict_types=1);
 
 require __DIR__ . '/vendor/autoload.php';
 
-$opts = getopt('o:', rest_index: $rest_index);
+$opts = getopt('o:t:', rest_index: $rest_index);
 $rest = array_slice($argv, $rest_index);
 
 $gemlog_input_path = $rest[0] ?? null;
 $gemlog_output_path = $opts['o'] ?? null;
+$trim_prefix = $opts['t'] ?? null;
 
 if (is_null($gemlog_input_path) || !file_exists($gemlog_input_path)) {
     throw new \Exception('Please provide an input gemlog file listing some articles. Got: ' . $gemlog_input_path);
@@ -27,7 +28,8 @@ $gemlog->load($gemlog_input_path);
 $titles = $gemlog->getTitles();
 
 foreach ($titles as $title) {
-    $article_path = $dir . '/' . $title . '.md';
+    $encoded_title = str_replace('/', '%2F', $title);
+    $article_path = $dir . '/' . $encoded_title . '.md';
     $article->load($article_path);
     $gemtext = $article->convert();
 
@@ -35,13 +37,19 @@ foreach ($titles as $title) {
         continue;
     }
 
-    $sanitize_title = strtolower($title);
-    $sanitize_title = str_replace([' ', ','], ['-'], $sanitize_title);
-    $sanitize_title .= '.gmi';
+    $sanitized_title = $title;
 
-    $output_path = $gemlog_output_path . '/' . $sanitize_title;
+    if ($trim_prefix && strpos($sanitized_title, $trim_prefix) === 0) {
+        $sanitized_title = substr($sanitized_title, strlen($trim_prefix));
+    }
 
-    echo "Writing to ", $sanitize_title, "...\n";
+    $sanitized_title = strtolower($sanitized_title);
+    $sanitized_title = str_replace([' ', ','], ['-'], $sanitized_title);
+    $sanitized_title .= '.gmi';
+
+    $output_path = $gemlog_output_path . '/' . $sanitized_title;
+
+    echo "Writing to ", $sanitized_title, "...\n";
 
     $date = strtotime($article->getProperties()['date'] ?? null);
     if (empty($date)) {