Add arguments to rustfmt

crates/ra_lsp_server/src/config.rs

@@ -44,6 +44,8 @@ pub struct ServerConfig {
     /// Fine grained feature flags to disable specific features.
     pub feature_flags: FxHashMap<String, bool>,
 
+    pub rustfmt_args: Vec<String>,
+
     /// Cargo feature configurations.
     pub cargo_features: CargoFeatures,
 }
@@ -63,6 +65,7 @@ impl Default for ServerConfig {
             with_sysroot: true,
             feature_flags: FxHashMap::default(),
             cargo_features: Default::default(),
+            rustfmt_args: Vec::new(),
         }
     }
 }

crates/ra_lsp_server/src/main_loop.rs

@@ -178,6 +178,7 @@ pub fn main_loop(
                     command: config.cargo_watch_command,
                     all_targets: config.cargo_watch_all_targets,
                 },
+                rustfmt_args: config.rustfmt_args,
             }
         };
 

crates/ra_lsp_server/src/main_loop/handlers.rs

@@ -590,6 +590,7 @@ pub fn handle_formatting(
     let end_position = TextUnit::of_str(&file).conv_with(&file_line_index);
 
     let mut rustfmt = process::Command::new("rustfmt");
+    rustfmt.args(&world.options.rustfmt_args);
     if let Some(&crate_id) = crate_ids.first() {
         // Assume all crates are in the same edition
         let edition = world.analysis().crate_edition(crate_id)?;

crates/ra_lsp_server/src/world.rs

@@ -34,6 +34,7 @@ pub struct Options {
     pub supports_location_link: bool,
     pub line_folding_only: bool,
     pub max_inlay_hint_length: Option<usize>,
+    pub rustfmt_args: Vec<String>,
     pub cargo_watch: CheckOptions,
 }