Use rule name rather than message in --statistics (#11697)

Co-authored-by: Micha Reiser <micha@reiser.io>
Closes https://github.com/astral-sh/ruff/issues/11097.

crates/ruff/src/printer.rs

@@ -36,9 +36,9 @@ bitflags! {
 }
 
 #[derive(Serialize)]
-struct ExpandedStatistics<'a> {
+struct ExpandedStatistics {
     code: SerializeRuleAsCode,
-    message: &'a str,
+    name: SerializeRuleAsTitle,
     count: usize,
     fixable: bool,
 }
@@ -66,6 +66,29 @@ impl From<Rule> for SerializeRuleAsCode {
     }
 }
 
+struct SerializeRuleAsTitle(Rule);
+
+impl Serialize for SerializeRuleAsTitle {
+    fn serialize<S>(&self, serializer: S) -> std::result::Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        serializer.serialize_str(self.0.as_ref())
+    }
+}
+
+impl Display for SerializeRuleAsTitle {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.0.as_ref())
+    }
+}
+
+impl From<Rule> for SerializeRuleAsTitle {
+    fn from(rule: Rule) -> Self {
+        Self(rule)
+    }
+}
+
 pub(crate) struct Printer {
     format: OutputFormat,
     log_level: LogLevel,
@@ -317,29 +340,23 @@ impl Printer {
         let statistics: Vec<ExpandedStatistics> = diagnostics
             .messages
             .iter()
-            .map(|message| {
-                (
-                    message.kind.rule(),
-                    &message.kind.body,
-                    message.fix.is_some(),
-                )
-            })
+            .map(|message| (message.kind.rule(), message.fix.is_some()))
             .sorted()
-            .fold(vec![], |mut acc, (rule, body, fixable)| {
-                if let Some((prev_rule, _, _, count)) = acc.last_mut() {
+            .fold(vec![], |mut acc, (rule, fixable)| {
+                if let Some((prev_rule, _, count)) = acc.last_mut() {
                     if *prev_rule == rule {
                         *count += 1;
                         return acc;
                     }
                 }
-                acc.push((rule, body, fixable, 1));
+                acc.push((rule, fixable, 1));
                 acc
             })
             .iter()
-            .map(|(rule, message, fixable, count)| ExpandedStatistics {
+            .map(|(rule, fixable, count)| ExpandedStatistics {
                 code: (*rule).into(),
+                name: (*rule).into(),
                 count: *count,
-                message,
                 fixable: *fixable,
             })
             .sorted_by_key(|statistic| Reverse(statistic.count))
@@ -386,7 +403,7 @@ impl Printer {
                         } else {
                             ""
                         },
-                        statistic.message,
+                        statistic.name,
                     )?;
                 }
                 return Ok(());

crates/ruff/tests/integration_test.rs

@@ -854,7 +854,36 @@ fn show_statistics() {
     success: false
     exit_code: 1
     ----- stdout -----
-    1	F401	[*] `sys` imported but unused
+    1	F401	[*] unused-import
+
+    ----- stderr -----
+    "###);
+}
+
+#[test]
+fn show_statistics_json() {
+    let mut cmd = RuffCheck::default()
+        .args([
+            "--select",
+            "F401",
+            "--statistics",
+            "--output-format",
+            "json",
+        ])
+        .build();
+    assert_cmd_snapshot!(cmd
+        .pass_stdin("import sys\nimport os\n\nprint(os.getuid())\n"), @r###"
+    success: false
+    exit_code: 1
+    ----- stdout -----
+    [
+      {
+        "code": "F401",
+        "name": "unused-import",
+        "count": 1,
+        "fixable": true
+      }
+    ]
 
     ----- stderr -----
     "###);