nng_pipe_ev to const and update bindings

- Mixing of C and Rust enums is potentially undefined
- rustfmt

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "nng-sys"
-version = "1.1.1-rc.2"
+version = "1.2.3-rc.1"
 authors = ["Nathan Kent <[email protected]>", "Jake W <[email protected]>"]
 
 description = "Bindings to NNG (Nanomsg-Next-Generation) aka Nanomsg2"

README.md

@@ -14,9 +14,9 @@ Rust FFI bindings to [NNG](https://github.com/nanomsg/nng):
 
 Version of this crate tracks NNG: `<NNG_version>-rc.<crate_version>` (e.g. `1.1.1-rc.2`).
 
-To use the __latest crate__ for the most recent __stable version of NNG__ (1.1.1), in `Cargo.toml`:  
+To use the __latest crate__ for the most recent __stable version of NNG__ (1.2.x), in `Cargo.toml`:  
 ```toml
-nng-sys = "1.1.1-rc"
+nng-sys = "1.2.3-rc"
 ```
 
 Requirements:

build.rs

@@ -93,10 +93,13 @@ fn build_bindgen() {
         // Generate `pub const NNG_UNIT_EVENTS` instead of `nng_unit_enum_NNG_UNIT_EVENTS`
         .prepend_enum_name(false)
         // Generate `pub enum ...` instead of multiple `pub const ...`
-        .default_enum_style(bindgen::EnumVariation::Rust { non_exhaustive: false })
+        .default_enum_style(bindgen::EnumVariation::Rust {
+            non_exhaustive: false,
+        })
         .constified_enum("nng_flag_enum")
         // NNG_ESYSERR and NNG_ETRANERR are used like flag
         .constified_enum("nng_errno_enum")
+        .constified_enum("nng_pipe_ev")
         .use_core()
         .parse_callbacks(Box::new(BindgenCallbacks::default()))
         // Layout tests are non-portable; 64-bit tests are "wrong" size on 32-bit and always fail.

src/bindings.rs

@@ -463,13 +463,10 @@ extern "C" {
         arg3: *mut nng_sockaddr,
     ) -> ::std::os::raw::c_int;
 }
-#[repr(u32)]
-#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
-pub enum nng_pipe_ev {
-    NNG_PIPE_EV_ADD_PRE = 0,
-    NNG_PIPE_EV_ADD_POST = 1,
-    NNG_PIPE_EV_REM_POST = 2,
-}
+pub const NNG_PIPE_EV_ADD_PRE: nng_pipe_ev = 0;
+pub const NNG_PIPE_EV_ADD_POST: nng_pipe_ev = 1;
+pub const NNG_PIPE_EV_REM_POST: nng_pipe_ev = 2;
+pub type nng_pipe_ev = u32;
 pub type nng_pipe_cb = ::core::option::Option<
     unsafe extern "C" fn(arg1: nng_pipe, arg2: nng_pipe_ev, arg3: *mut ::core::ffi::c_void),
 >;