Allow SPDX license headers to exceed the line length

crates/ruff_linter/resources/test/fixtures/pycodestyle/E501.py

@@ -82,3 +82,8 @@ class Bar:
     """
     This is a long sentence that ends with a shortened URL and, therefore, could easily be broken across multiple lines ([source](https://ruff.rs))
     """
+
+
+# OK
+# SPDX-FileCopyrightText: Copyright 2012-2015 Charlie Marsh <very-long-email-address@fake.com>
+# SPDX-License-Identifier: a very long license identifier that exceeds the line length limit

crates/ruff_linter/src/rules/pycodestyle/overlong.rs

@@ -53,7 +53,7 @@ impl Overlong {
         };
 
         let mut chunks = line.split_whitespace();
-        let (Some(_), Some(second_chunk)) = (chunks.next(), chunks.next()) else {
+        let (Some(first_chunk), Some(second_chunk)) = (chunks.next(), chunks.next()) else {
             // Single word / no printable chars - no way to make the line shorter.
             return None;
         };
@@ -67,6 +67,15 @@ impl Overlong {
             }
         }
 
+        // Do not enforce the line length limit for SPDX license headers, which are machine-readable
+        // and explicitly _not_ recommended to wrap over multiple lines.
+        if matches!(
+            (first_chunk, second_chunk),
+            ("#", "SPDX-License-Identifier:" | "SPDX-FileCopyrightText:")
+        ) {
+            return None;
+        }
+
         // Obtain the start offset of the part of the line that exceeds the limit.
         let mut start_offset = line.start();
         let mut start_width = LineWidthBuilder::new(tab_size);