Make binding generation use the same rustfmt config

crates/libs/bindgen/src/rust/mod.rs

@@ -38,6 +38,11 @@ pub fn from_reader(
     writer.no_inner_attributes = config.remove("no-inner-attributes").is_some();
     writer.no_bindgen_comment = config.remove("no-bindgen-comment").is_some();
     writer.vtbl = config.remove("vtbl").is_some();
+    writer.rustfmt_config = if let Some(config) = config.remove("rustfmt-config") {
+        config.to_string()
+    } else {
+        String::new()
+    };
 
     if writer.package && writer.flatten {
         return Err(Error::new(

crates/libs/bindgen/src/rust/try_format.rs

@@ -23,12 +23,17 @@ pub fn try_format(writer: &super::Writer, tokens: &str) -> String {
     };
     let tokens = format!("{preamble}{allow}{tokens}");
 
-    let Ok(mut child) = std::process::Command::new("rustfmt")
-        .stdin(std::process::Stdio::piped())
-        .stdout(std::process::Stdio::piped())
-        .stderr(std::process::Stdio::null())
-        .spawn()
-    else {
+    let mut cmd = std::process::Command::new("rustfmt");
+    cmd.stdin(std::process::Stdio::piped());
+    cmd.stdout(std::process::Stdio::piped());
+    cmd.stderr(std::process::Stdio::null());
+
+    if !writer.rustfmt_config.is_empty() {
+        cmd.arg("--config");
+        cmd.arg(writer.rustfmt_config.as_str());
+    }
+
+    let Ok(mut child) = cmd.spawn() else {
         return tokens;
     };
 

crates/libs/bindgen/src/rust/writer.rs

@@ -22,6 +22,8 @@ pub struct Writer {
     pub no_bindgen_comment: bool, // skips the bindgen comment at the start of the file
     pub vtbl: bool,    // include minimal vtbl layout support for interfaces
     pub prepend: std::collections::HashMap<metadata::TypeDef, String>,
+    /// If this is not empty, then it is passed to rustfmt in a `--config` argument.
+    pub rustfmt_config: String,
 }
 
 impl Writer {
@@ -40,6 +42,7 @@ impl Writer {
             no_bindgen_comment: false,
             vtbl: false,
             prepend: Default::default(),
+            rustfmt_config: String::new(),
         }
     }
 

crates/tools/sys/bindings.txt

@@ -1,6 +1,7 @@
 --in crates/libs/bindgen/default
 --out crates/libs/sys/src/lib.rs
 --config package sys no-bindgen-comment
+--config rustfmt-config=max_width=800,newline_style=Unix
 
 --filter
     Windows.Wdk

crates/tools/windows/bindings.txt

@@ -5,6 +5,7 @@
 --config prepend:Windows.Win32.Foundation.BOOL=#[must_use]
 --config prepend:Windows.Win32.Foundation.NTSTATUS=#[must_use]
 --config prepend:Windows.Win32.System.Rpc.RPC_STATUS=#[must_use]
+--config rustfmt-config=max_width=800,newline_style=Unix
 
 --filter
     Windows