[`flake8-todos`] Allow VSCode GitHub PR extension style links in `missing-todo-link` (`TD003`) (#15519)

## Summary
Allow links to issues that appear on the same line as the TODO
directive, if they conform to the format that VSCode's GitHub PR
extension produces.

Revival of #9627 (the branch was stale enough that rebasing was a lot
harder than just making the changes anew). Credit should go to the
author of that PR though.

Closes #8061

Co-authored-by: Martin Bernstorff <martinbernstorff@gmail.com>

crates/ruff_linter/resources/test/fixtures/flake8_todos/TD003.py

@@ -34,4 +34,10 @@ def foo(x):
 
 # foo # TODO: no link!
 
+# TODO: https://github.com/astral-sh/ruff/pull/9627 A todo with a link on the same line
+
+# TODO: #9627 A todo with a number on the same line
+
+# TODO: A todo with a random number, 5431
+
 # TODO: here's a TODO on the last line with no link

crates/ruff_linter/src/rules/flake8_todos/rules/todos.rs

@@ -91,6 +91,12 @@ impl Violation for MissingTodoAuthor {
 /// # TODO(charlie): this comment has a 3-digit issue code
 /// # 003
 ///
+/// # TODO(charlie): https://github.com/astral-sh/ruff/issues/3870
+/// # this comment has an issue link
+///
+/// # TODO(charlie): #003 this comment has a 3-digit issue code
+/// # with leading character `#`
+///
 /// # TODO(charlie): this comment has an issue code (matches the regex `[A-Z]+\-?\d+`)
 /// # SIXCHR-003
 /// ```
@@ -100,7 +106,7 @@ pub(crate) struct MissingTodoLink;
 impl Violation for MissingTodoLink {
     #[derive_message_formats]
     fn message(&self) -> String {
-        "Missing issue link on the line following this TODO".to_string()
+        "Missing issue link for this TODO".to_string()
     }
 }
 
@@ -224,7 +230,7 @@ impl Violation for MissingSpaceAfterTodoColon {
     }
 }
 
-static ISSUE_LINK_REGEX_SET: LazyLock<RegexSet> = LazyLock::new(|| {
+static ISSUE_LINK_OWN_LINE_REGEX_SET: LazyLock<RegexSet> = LazyLock::new(|| {
     RegexSet::new([
         r"^#\s*(http|https)://.*", // issue link
         r"^#\s*\d+$",              // issue code - like "003"
@@ -233,6 +239,14 @@ static ISSUE_LINK_REGEX_SET: LazyLock<RegexSet> = LazyLock::new(|| {
     .unwrap()
 });
 
+static ISSUE_LINK_TODO_LINE_REGEX_SET: LazyLock<RegexSet> = LazyLock::new(|| {
+    RegexSet::new([
+        r"\s*(http|https)://.*", // issue link
+        r"\s*#\d+.*",            // issue code - like "#003"
+    ])
+    .unwrap()
+});
+
 pub(crate) fn todos(
     diagnostics: &mut Vec<Diagnostic>,
     todo_comments: &[TodoComment],
@@ -257,6 +271,13 @@ pub(crate) fn todos(
         static_errors(diagnostics, content, range, directive);
 
         let mut has_issue_link = false;
+        // VSCode recommended links on same line are ok:
+        // `# TODO(dylan): #1234`
+        if ISSUE_LINK_TODO_LINE_REGEX_SET
+            .is_match(locator.slice(TextRange::new(directive.range.end(), range.end())))
+        {
+            continue;
+        }
         let mut curr_range = range;
         for next_range in comment_ranges.iter().skip(range_index + 1).copied() {
             // Ensure that next_comment_range is in the same multiline comment "block" as
@@ -274,7 +295,7 @@ pub(crate) fn todos(
                 break;
             }
 
-            if ISSUE_LINK_REGEX_SET.is_match(next_comment) {
+            if ISSUE_LINK_OWN_LINE_REGEX_SET.is_match(next_comment) {
                 has_issue_link = true;
             }
 

crates/ruff_linter/src/rules/flake8_todos/snapshots/ruff_linter__rules__flake8_todos__tests__missing-todo-link_TD003.py.snap

@@ -1,7 +1,7 @@
 ---
 source: crates/ruff_linter/src/rules/flake8_todos/mod.rs
 ---
-TD003.py:15:3: TD003 Missing issue link on the line following this TODO
+TD003.py:15:3: TD003 Missing issue link for this TODO
    |
 14 | # TDO003 - errors
 15 | # TODO: this comment has no
@@ -9,7 +9,7 @@ TD003.py:15:3: TD003 Missing issue link on the line following this TODO
 16 | # link after it
    |
 
-TD003.py:18:3: TD003 Missing issue link on the line following this TODO
+TD003.py:18:3: TD003 Missing issue link for this TODO
    |
 16 | # link after it
 17 |
@@ -19,7 +19,7 @@ TD003.py:18:3: TD003 Missing issue link on the line following this TODO
 20 |     return x
    |
 
-TD003.py:31:3: TD003 Missing issue link on the line following this TODO
+TD003.py:31:3: TD003 Missing issue link for this TODO
    |
 29 | # TDO-3870
 30 |
@@ -29,20 +29,30 @@ TD003.py:31:3: TD003 Missing issue link on the line following this TODO
 33 | # TDO-3870
    |
 
-TD003.py:35:9: TD003 Missing issue link on the line following this TODO
+TD003.py:35:9: TD003 Missing issue link for this TODO
    |
 33 | # TDO-3870
 34 |
 35 | # foo # TODO: no link!
    |         ^^^^ TD003
 36 |
-37 | # TODO: here's a TODO on the last line with no link
+37 | # TODO: https://github.com/astral-sh/ruff/pull/9627 A todo with a link on the same line
    |
 
-TD003.py:37:3: TD003 Missing issue link on the line following this TODO
+TD003.py:41:3: TD003 Missing issue link for this TODO
    |
-35 | # foo # TODO: no link!
+39 | # TODO: #9627 A todo with a number on the same line
-36 |
+40 |
-37 | # TODO: here's a TODO on the last line with no link
+41 | # TODO: A todo with a random number, 5431
+   |   ^^^^ TD003
+42 |
+43 | # TODO: here's a TODO on the last line with no link
+   |
+
+TD003.py:43:3: TD003 Missing issue link for this TODO
+   |
+41 | # TODO: A todo with a random number, 5431
+42 |
+43 | # TODO: here's a TODO on the last line with no link
    |   ^^^^ TD003
    |