feat(cli): let --statistics show fixable codes (#2659)

crates/ruff_cli/src/printer.rs

@@ -48,6 +48,7 @@ struct ExpandedStatistics<'a> {
     count: usize,
     code: &'a str,
     message: String,
+    fixable: bool,
 }
 
 struct SerializeRuleAsCode<'a>(&'a Rule);
@@ -371,6 +372,12 @@ impl<'a> Printer<'a> {
                     .find(|message| message.kind.rule() == *rule)
                     .map(|message| message.kind.body())
                     .unwrap(),
+                fixable: diagnostics
+                    .messages
+                    .iter()
+                    .find(|message| message.kind.rule() == *rule)
+                    .iter()
+                    .any(|message| message.kind.fixable()),
             })
             .collect::<Vec<_>>();
 
@@ -391,13 +398,25 @@ impl<'a> Printer<'a> {
                     .map(|statistic| statistic.code.len())
                     .max()
                     .unwrap();
+                let any_fixable = statistics.iter().any(|statistic| statistic.fixable);
 
                 // By default, we mimic Flake8's `--statistics` format.
-                for msg in statistics {
+                for statistic in statistics {
                     writeln!(
                         stdout,
-                        "{:>count_width$}\t{:<code_width$}\t{}",
+                        "{:>count_width$}\t{:<code_width$}\t{}{}",
-                        msg.count, msg.code, msg.message
+                        statistic.count,
+                        statistic.code,
+                        if any_fixable {
+                            if statistic.fixable {
+                                "[*] "
+                            } else {
+                                "[ ] "
+                            }
+                        } else {
+                            ""
+                        },
+                        statistic.message,
                     )?;
                 }
                 return Ok(());

crates/ruff_cli/tests/integration_test.rs

@@ -200,7 +200,7 @@ fn show_statistics() -> Result<()> {
             .lines()
             .last()
             .unwrap(),
-        "1\tF401\t`sys` imported but unused"
+        "1\tF401\t[*] `sys` imported but unused"
     );
     Ok(())
 }