Optionally show fixes when using `--features ecosystem_ci` with cargo and `--show-fixes` at runtime (#4191)

* Generate fixes when using --show-fixes

Example command: `cargo run --bin ruff -- --no-cache --select F401
--show-source --show-fixes
crates/ruff/resources/test/fixtures/pyflakes/F401_9.py`

Before, `--show-fixes` was ignored:

```
crates/ruff/resources/test/fixtures/pyflakes/F401_9.py:4:22: F401 [*] `foo.baz` imported but unused
  |
4 | __all__ = ("bar",)
5 | from foo import bar, baz
  |                      ^^^ F401
  |
  = help: Remove unused import: `foo.baz`

Found 1 error.
[*] 1 potentially fixable with the --fix option.
```

After:

```
crates/ruff/resources/test/fixtures/pyflakes/F401_9.py:4:22: F401 [*] `foo.baz` imported but unused
  |
4 | __all__ = ("bar",)
5 | from foo import bar, baz
  |                      ^^^ F401
  |
  = help: Remove unused import: `foo.baz`

ℹ Suggested fix
1 1 | """Test: late-binding of `__all__`."""
2 2 |
3 3 | __all__ = ("bar",)
4   |-from foo import bar, baz
  4 |+from foo import bar

Found 1 error.
[*] 1 potentially fixable with the --fix option.
```

* Add `--format ecosystem-ci`

* cargo dev generate-all

* Put behind cargo feature

* Regenerate docs

* Don't test ecosystem_ci feature on CI

* Use top level flag instead

* Fix

* Simplify code based on #4191

* Remove old TODO comment

.gitignore

@@ -4,6 +4,7 @@ crates/ruff/resources/test/cpython
 mkdocs.yml
 .overrides
 github_search.jsonl
+ruff-old
 
 ###
 # Rust.gitignore

crates/ruff/Cargo.toml

@@ -83,3 +83,4 @@ default = []
 schemars = ["dep:schemars"]
 logical_lines = []
 jupyter_notebook = []
+ecosystem_ci = []

crates/ruff_cli/Cargo.toml

@@ -66,6 +66,7 @@ ureq = { version = "2.6.2", features = [] }
 
 [features]
 jupyter_notebook = ["ruff/jupyter_notebook"]
+ecosystem_ci = ["ruff/ecosystem_ci"]
 
 [package.metadata.maturin]
 name = "ruff"

crates/ruff_cli/src/args.rs

@@ -291,6 +291,10 @@ pub struct CheckArgs {
         conflicts_with = "watch",
     )]
     pub show_settings: bool,
+    /// Dev-only argument to show fixes
+    #[cfg(feature = "ecosystem_ci")]
+    #[arg(long, hide = true)]
+    pub ecosystem_ci: bool,
 }
 
 #[derive(Debug, Clone, Copy, clap::ValueEnum)]

crates/ruff_cli/src/commands/run.rs

@@ -254,6 +254,8 @@ mod test {
             LogLevel::Default,
             FixMode::None,
             Flags::SHOW_VIOLATIONS,
+            #[cfg(feature = "ecosystem_ci")]
+            false,
         );
         let mut writer: Vec<u8> = Vec::new();
         // Mute the terminal color codes

crates/ruff_cli/src/lib.rs

@@ -123,6 +123,8 @@ quoting the executed command, along with the relevant file contents and `pyproje
 }
 
 fn check(args: CheckArgs, log_level: LogLevel) -> Result<ExitStatus> {
+    #[cfg(feature = "ecosystem_ci")]
+    let ecosystem_ci = args.ecosystem_ci;
     let (cli, overrides) = args.partition();
 
     // Construct the "default" settings. These are used when no `pyproject.toml`
@@ -209,7 +211,14 @@ fn check(args: CheckArgs, log_level: LogLevel) -> Result<ExitStatus> {
         return Ok(ExitStatus::Success);
     }
 
-    let printer = Printer::new(format, log_level, autofix, printer_flags);
+    let printer = Printer::new(
+        format,
+        log_level,
+        autofix,
+        printer_flags,
+        #[cfg(feature = "ecosystem_ci")]
+        ecosystem_ci,
+    );
 
     if cli.watch {
         if format != SerializationFormat::Text {

crates/ruff_cli/src/printer.rs

@@ -70,6 +70,9 @@ pub(crate) struct Printer {
     log_level: LogLevel,
     autofix_level: flags::FixMode,
     flags: Flags,
+    /// Dev-only argument to show fixes
+    #[cfg(feature = "ecosystem_ci")]
+    ecosystem_ci: bool,
 }
 
 impl Printer {
@@ -78,12 +81,15 @@ impl Printer {
         log_level: LogLevel,
         autofix_level: flags::FixMode,
         flags: Flags,
+        #[cfg(feature = "ecosystem_ci")] ecosystem_ci: bool,
     ) -> Self {
         Self {
             format,
             log_level,
             autofix_level,
             flags,
+            #[cfg(feature = "ecosystem_ci")]
+            ecosystem_ci,
         }
     }
 
@@ -179,8 +185,14 @@ impl Printer {
                 JunitEmitter::default().emit(writer, &diagnostics.messages, &context)?;
             }
             SerializationFormat::Text => {
+                #[cfg(feature = "ecosystem_ci")]
+                let show_fixes = self.ecosystem_ci && self.flags.contains(Flags::SHOW_FIXES);
+                #[cfg(not(feature = "ecosystem_ci"))]
+                let show_fixes = false;
+
                 TextEmitter::default()
                     .with_show_fix_status(show_fix_status(self.autofix_level))
+                    .with_show_fix(show_fixes)
                     .with_show_source(self.flags.contains(Flags::SHOW_SOURCE))
                     .emit(writer, &diagnostics.messages, &context)?;
 

scripts/Dockerfile.ecosystem

@@ -13,15 +13,15 @@
 # ```
 # From the project root:
 # ```
-# cargo build --target x86_64-unknown-linux-musl
+# cargo build --target x86_64-unknown-linux-musl --features ecosystem_ci
 # docker buildx build -f scripts/Dockerfile.ecosystem -t ruff-ecosystem-checker --load .
-# docker run --rm ruff-ecosystem-checker
+# docker run --rm -v ./target/x86_64-unknown-linux-musl/debug/ruff:/app/ruff-new -v ./ruff-old:/app/ruff-old ruff-ecosystem-checker
 # ```
 
 FROM python:3.11
-RUN python -m venv .venv && .venv/bin/pip install ruff
+RUN mkdir /app
+WORKDIR /app
 ADD scripts/check_ecosystem.py check_ecosystem.py
 ADD github_search.jsonl github_search.jsonl
-ADD target/x86_64-unknown-linux-musl/debug/ruff ruff-new
 
-CMD ["python", "check_ecosystem.py", "--verbose", "--projects", "github_search.jsonl", "ruff-new", ".venv/bin/ruff"]
+CMD ["python", "check_ecosystem.py", "--verbose", "--projects", "github_search.jsonl", "ruff-new", "ruff-old"]