refactor: include edition & style edition in CliOptions

src/bin/main.rs

@@ -734,6 +734,18 @@ fn apply_to(self, config: &mut Config) {
     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 edition_from_edition_str(edition_str: &str) -> Result<Edition> {

src/config/mod.rs

@@ -376,9 +376,13 @@ 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) = match options {
+        Some(ref opts) => (
+            config_path(opts)?,
+            opts.edition(),
+            opts.style_edition(),
+        ),
+        None => (None, None, None),
     };
 
     let result = if let Some(over_ride) = over_ride {

src/config/options.rs

@@ -419,6 +419,8 @@ 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>;
 }
 
 /// The edition of the syntax and semantics of code (RFC 2052).

src/git-rustfmt/main.rs

@@ -89,6 +89,12 @@ fn apply_to(self, _: &mut rustfmt::Config) {
     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 uncommitted_files() -> Vec<String> {