implement 2024 expression overflowing

rustfmt.toml

@@ -1,3 +1,4 @@
 error_on_line_overflow = true
 error_on_unformatted = true
 style_edition = "2024"
+overflow_delimited_expr = false

src/bin/main.rs

@@ -19,7 +19,7 @@ use getopts::{Matches, Options};
 
 use crate::rustfmt::{
     load_config, CliOptions, Color, Config, Edition, EmitMode, FileLines, FileName,
-    FormatReportFormatterBuilder, Input, Session, StyleEdition, Verbosity,
+    FormatReportFormatterBuilder, Input, Session, StyleEdition, Verbosity, Version,
 };
 
 const BUG_REPORT_URL: &str = "https://github.com/rust-lang/rustfmt/issues/new?labels=bug";
@@ -734,6 +734,25 @@ impl CliOptions for GetOptsOptions {
     fn config_path(&self) -> Option<&Path> {
         self.config_path.as_deref()
     }
+
+    fn edition(&self) -> Option<Edition> {
+        self.inline_config
+            .get("edition")
+            .map_or(self.edition, |e| Edition::from_str(e).ok())
+    }
+
+    fn style_edition(&self) -> Option<StyleEdition> {
+        self.inline_config
+            .get("style_edition")
+            .map_or(self.style_edition, |se| StyleEdition::from_str(se).ok())
+    }
+
+    fn version(&self) -> Option<Version> {
+        self.inline_config
+            .get("version")
+            .map(|version| Version::from_str(version).ok())
+            .flatten()
+    }
 }
 
 fn edition_from_edition_str(edition_str: &str) -> Result<Edition> {
@@ -802,6 +821,17 @@ mod test {
         options.inline_config = HashMap::from([("version".to_owned(), "Two".to_owned())]);
         let config = get_config(None, Some(options));
         assert_eq!(config.style_edition(), StyleEdition::Edition2024);
+        assert_eq!(config.overflow_delimited_expr(), true);
+    }
+
+    #[nightly_only_test]
+    #[test]
+    fn version_config_file_sets_style_edition_override_correctly() {
+        let options = GetOptsOptions::default();
+        let config_file = Some(Path::new("tests/config/style-edition/just-version"));
+        let config = get_config(config_file, Some(options));
+        assert_eq!(config.style_edition(), StyleEdition::Edition2024);
+        assert_eq!(config.overflow_delimited_expr(), true);
     }
 
     #[nightly_only_test]
@@ -846,6 +876,7 @@ mod test {
         ]);
         let config = get_config(None, Some(options));
         assert_eq!(config.style_edition(), StyleEdition::Edition2024);
+        assert_eq!(config.overflow_delimited_expr(), true);
     }
 
     #[nightly_only_test]
@@ -903,4 +934,36 @@ mod test {
         let config = get_config(config_file, Some(options));
         assert_eq!(config.style_edition(), StyleEdition::Edition2021);
     }
+
+    #[nightly_only_test]
+    #[test]
+    fn correct_defaults_for_style_edition_loaded() {
+        let mut options = GetOptsOptions::default();
+        options.style_edition = Some(StyleEdition::Edition2024);
+        let config = get_config(None, Some(options));
+        assert_eq!(config.style_edition(), StyleEdition::Edition2024);
+        assert_eq!(config.overflow_delimited_expr(), true);
+    }
+
+    #[nightly_only_test]
+    #[test]
+    fn style_edition_defaults_overridden_from_config() {
+        let options = GetOptsOptions::default();
+        let config_file = Some(Path::new("tests/config/style-edition/overrides"));
+        let config = get_config(config_file, Some(options));
+        assert_eq!(config.style_edition(), StyleEdition::Edition2024);
+        assert_eq!(config.overflow_delimited_expr(), false);
+    }
+
+    #[nightly_only_test]
+    #[test]
+    fn style_edition_defaults_overridden_from_cli() {
+        let mut options = GetOptsOptions::default();
+        let config_file = Some(Path::new("tests/config/style-edition/just-style-edition"));
+        options.inline_config =
+            HashMap::from([("overflow_delimited_expr".to_owned(), "false".to_owned())]);
+        let config = get_config(config_file, Some(options));
+        assert_eq!(config.style_edition(), StyleEdition::Edition2024);
+        assert_eq!(config.overflow_delimited_expr(), false);
+    }
 }

src/config/config_type.rs

@@ -134,7 +134,6 @@ macro_rules! create_config {
                     "fn_args_layout" => self.0.set_fn_args_layout(),
                     "hide_parse_errors" => self.0.set_hide_parse_errors(),
                     "version" => self.0.set_version(),
-                    "edition" => self.0.set_edition(),
                     &_ => (),
                 }
             }
@@ -165,7 +164,6 @@ macro_rules! create_config {
                     "fn_args_layout" => self.0.set_fn_args_layout(),
                     "hide_parse_errors" => self.0.set_hide_parse_errors(),
                     "version" => self.0.set_version(),
-                    "edition" => self.0.set_edition(),
                     &_ => (),
                 }
             }
@@ -210,7 +208,7 @@ macro_rules! create_config {
             )+
 
             #[allow(unreachable_pub)]
-            pub fn default_with_style_edition(style_edition: StyleEdition) -> Config {
+            pub(super) fn default_with_style_edition(style_edition: StyleEdition) -> Config {
                 Config {
                     $(
                         $i: (
@@ -264,7 +262,6 @@ macro_rules! create_config {
                 self.set_fn_args_layout();
                 self.set_hide_parse_errors();
                 self.set_version();
-                self.set_edition();
                 self
             }
 
@@ -367,7 +364,6 @@ macro_rules! create_config {
                     "fn_args_layout" => self.set_fn_args_layout(),
                     "hide_parse_errors" => self.set_hide_parse_errors(),
                     "version" => self.set_version(),
-                    "edition" => self.set_edition(),
                     &_ => (),
                 }
             }
@@ -585,30 +581,9 @@ macro_rules! create_config {
                         option which takes precedence. \
                         The value of the `version` option will be ignored."
                     );
-                } else if matches!(self.version(), Version::Two) {
-                    self.style_edition.2 = StyleEdition::Edition2024;
-                } else {
-                    self.style_edition.2 = StyleEdition::Edition2015;
                 }
             }
 
-            fn set_edition(&mut self) {
-                let style_edition_set = self.was_set().style_edition()
-                    || self.was_set_cli().style_edition();
-
-                if style_edition_set || self.was_set().version() {
-                    return;
-                }
-
-                // User has explicitly specified an Edition value without
-                // explicitly specifying a Style Edition value, so the Style Edition
-                // must default to whatever value was provided for Edition
-                // as per: https://rust-lang.github.io/rfcs/3338-style-evolution.html#explanation
-                self.style_edition.2 = self.edition().into();
-            }
-
-
-
             #[allow(unreachable_pub)]
             /// Returns `true` if the config key was explicitly set and is the default value.
             pub fn is_default(&self, key: &str) -> bool {

src/config/mod.rs

@@ -217,9 +217,48 @@ impl PartialConfig {
 
         ::toml::to_string(&cloned).map_err(ToTomlError)
     }
+
+    pub(super) fn to_parsed_config(
+        self,
+        style_edition_override: Option<StyleEdition>,
+        edition_override: Option<Edition>,
+        version_override: Option<Version>,
+        dir: &Path,
+    ) -> Config {
+        Config::default_for_possible_style_edition(
+            style_edition_override.or(self.style_edition),
+            edition_override.or(self.edition),
+            version_override.or(self.version),
+        )
+        .fill_from_parsed_config(self, dir)
+    }
 }
 
 impl Config {
+    pub fn default_for_possible_style_edition(
+        style_edition: Option<StyleEdition>,
+        edition: Option<Edition>,
+        version: Option<Version>,
+    ) -> Config {
+        // Ensures the configuration defaults associated with Style Editions
+        // follow the precedence set in
+        // https://rust-lang.github.io/rfcs/3338-style-evolution.html
+        // 'version' is a legacy alias for 'style_edition' that we'll support
+        // for some period of time
+        // FIXME(calebcartwright) - remove 'version' at some point
+        match (style_edition, version, edition) {
+            (Some(se), _, _) => Self::default_with_style_edition(se),
+            (None, Some(Version::Two), _) => {
+                Self::default_with_style_edition(StyleEdition::Edition2024)
+            }
+            (None, Some(Version::One), _) => {
+                Self::default_with_style_edition(StyleEdition::Edition2015)
+            }
+            (None, None, Some(e)) => Self::default_with_style_edition(e.into()),
+            (None, None, None) => Config::default(),
+        }
+    }
+
     pub(crate) fn version_meets_requirement(&self) -> bool {
         if self.was_set().required_version() {
             let version = env!("CARGO_PKG_VERSION");
@@ -243,12 +282,23 @@ impl Config {
     ///
     /// Returns a `Config` if the config could be read and parsed from
     /// the file, otherwise errors.
-    pub(super) fn from_toml_path(file_path: &Path) -> Result<Config, Error> {
+    pub(super) fn from_toml_path(
+        file_path: &Path,
+        edition: Option<Edition>,
+        style_edition: Option<StyleEdition>,
+        version: Option<Version>,
+    ) -> Result<Config, Error> {
         let mut file = File::open(&file_path)?;
         let mut toml = String::new();
         file.read_to_string(&mut toml)?;
-        Config::from_toml(&toml, file_path.parent().unwrap())
-            .map_err(|err| Error::new(ErrorKind::InvalidData, err))
+        Config::from_toml_for_style_edition(
+            &toml,
+            file_path.parent().unwrap(),
+            edition,
+            style_edition,
+            version,
+        )
+        .map_err(|err| Error::new(ErrorKind::InvalidData, err))
     }
 
     /// Resolves the config for input in `dir`.
@@ -260,7 +310,12 @@ impl Config {
     ///
     /// Returns the `Config` to use, and the path of the project file if there was
     /// one.
-    pub(super) fn from_resolved_toml_path(dir: &Path) -> Result<(Config, Option<PathBuf>), Error> {
+    pub(super) fn from_resolved_toml_path(
+        dir: &Path,
+        edition: Option<Edition>,
+        style_edition: Option<StyleEdition>,
+        version: Option<Version>,
+    ) -> Result<(Config, Option<PathBuf>), Error> {
         /// Try to find a project file in the given directory and its parents.
         /// Returns the path of the nearest project file if one exists,
         /// or `None` if no project file was found.
@@ -305,12 +360,27 @@ impl Config {
         }
 
         match resolve_project_file(dir)? {
-            None => Ok((Config::default(), None)),
-            Some(path) => Config::from_toml_path(&path).map(|config| (config, Some(path))),
+            None => Ok((
+                Config::default_for_possible_style_edition(style_edition, edition, version),
+                None,
+            )),
+            Some(path) => Config::from_toml_path(&path, edition, style_edition, version)
+                .map(|config| (config, Some(path))),
         }
     }
 
-    pub(crate) fn from_toml(toml: &str, dir: &Path) -> Result<Config, String> {
+    #[allow(dead_code)]
+    pub(super) fn from_toml(toml: &str, dir: &Path) -> Result<Config, String> {
+        Self::from_toml_for_style_edition(toml, dir, None, None, None)
+    }
+
+    pub(crate) fn from_toml_for_style_edition(
+        toml: &str,
+        dir: &Path,
+        edition: Option<Edition>,
+        style_edition: Option<StyleEdition>,
+        version: Option<Version>,
+    ) -> Result<Config, String> {
         let parsed: ::toml::Value = toml
             .parse()
             .map_err(|e| format!("Could not parse TOML: {}", e))?;
@@ -324,12 +394,13 @@ impl Config {
                 err.push_str(msg)
             }
         }
-        match parsed.try_into() {
+
+        match parsed.try_into::<PartialConfig>() {
             Ok(parsed_config) => {
                 if !err.is_empty() {
                     eprint!("{err}");
                 }
-                Ok(Config::default().fill_from_parsed_config(parsed_config, dir))
+                Ok(parsed_config.to_parsed_config(style_edition, edition, version, dir))
             }
             Err(e) => {
                 err.push_str("Error: Decoding config file failed:\n");
@@ -347,17 +418,26 @@ pub fn load_config<O: CliOptions>(
     file_path: Option<&Path>,
     options: Option<O>,
 ) -> Result<(Config, Option<PathBuf>), Error> {
-    let over_ride = match options {
-        Some(ref opts) => config_path(opts)?,
-        None => None,
+    let (over_ride, edition, style_edition, version) = match options {
+        Some(ref opts) => (
+            config_path(opts)?,
+            opts.edition(),
+            opts.style_edition(),
+            opts.version(),
+        ),
+        None => (None, None, None, None),
     };
 
     let result = if let Some(over_ride) = over_ride {
-        Config::from_toml_path(over_ride.as_ref()).map(|p| (p, Some(over_ride.to_owned())))
+        Config::from_toml_path(over_ride.as_ref(), edition, style_edition, version)
+            .map(|p| (p, Some(over_ride.to_owned())))
     } else if let Some(file_path) = file_path {
-        Config::from_resolved_toml_path(file_path)
+        Config::from_resolved_toml_path(file_path, edition, style_edition, version)
     } else {
-        Ok((Config::default(), None))
+        Ok((
+            Config::default_for_possible_style_edition(style_edition, edition, version),
+            None,
+        ))
     };
 
     result.map(|(mut c, p)| {
@@ -768,7 +848,7 @@ binop_separator = "Front"
 remove_nested_parens = true
 combine_control_expr = true
 short_array_element_width_threshold = 10
-overflow_delimited_expr = false
+overflow_delimited_expr = true
 struct_field_align_threshold = 0
 enum_discrim_align_threshold = 0
 match_arm_blocks = true

src/config/options.rs

@@ -419,6 +419,9 @@ pub trait CliOptions {
     /// It is ok if the returned path doesn't exist or is not canonicalized
     /// (i.e. the callers are expected to handle such cases).
     fn config_path(&self) -> Option<&Path>;
+    fn edition(&self) -> Option<Edition>;
+    fn style_edition(&self) -> Option<StyleEdition>;
+    fn version(&self) -> Option<Version>;
 }
 
 /// The edition of the syntax and semantics of code (RFC 2052).
@@ -625,7 +628,7 @@ config_option_with_style_edition_default!(
     RemoveNestedParens, bool, _ => true;
     CombineControlExpr, bool, _ => true;
     ShortArrayElementWidthThreshold, usize, _ => 10;
-    OverflowDelimitedExpr, bool, _ => false;
+    OverflowDelimitedExpr, bool, Edition2024 => true, _ => false;
     StructFieldAlignThreshold, usize, _ => 0;
     EnumDiscrimAlignThreshold, usize, _ => 0;
     MatchArmBlocks, bool, _ => true;

src/git-rustfmt/main.rs

@@ -15,7 +15,9 @@ use getopts::{Matches, Options};
 use rustfmt_nightly as rustfmt;
 use tracing_subscriber::EnvFilter;
 
-use crate::rustfmt::{load_config, CliOptions, FormatReportFormatterBuilder, Input, Session};
+use crate::rustfmt::{
+    load_config, CliOptions, FormatReportFormatterBuilder, Input, Session, Version,
+};
 
 fn prune_files(files: Vec<&str>) -> Vec<&str> {
     let prefixes: Vec<_> = files
@@ -89,6 +91,15 @@ impl CliOptions for NullOptions {
     fn config_path(&self) -> Option<&Path> {
         unreachable!();
     }
+    fn edition(&self) -> Option<rustfmt_nightly::Edition> {
+        unreachable!();
+    }
+    fn style_edition(&self) -> Option<rustfmt_nightly::StyleEdition> {
+        unreachable!();
+    }
+    fn version(&self) -> Option<Version> {
+        unreachable!();
+    }
 }
 
 fn uncommitted_files() -> Vec<String> {