feat(build): use prettyplease to format output (hyperium#890)

Make it a hard dependency and drop the optional rustfmt feature.

Fixes: hyperium#890

README.md

@@ -45,7 +45,6 @@ the generated code.
 
 ```bash
 $ rustup update
-$ rustup component add rustfmt
 $ cargo build
 ```
 

examples/helloworld-tutorial.md

@@ -26,7 +26,6 @@ feature.
 
 ```bash
 $ rustup update
-$ rustup component add rustfmt
 ```
 
 ## Defining the HelloWorld service

examples/routeguide-tutorial.md

@@ -47,12 +47,6 @@ Change your current directory to Tonic's repository root:
 $ cd tonic
 ```
 
-Tonic uses `rustfmt` to tidy up the code it generates, so we'll make sure it's installed.
-
-```shell
-$ rustup component add rustfmt
-```
-
 Run the server
 ```shell
 $ cargo run --bin routeguide-server

tonic-build/Cargo.toml

@@ -15,16 +15,16 @@ repository = "https://github.com/hyperium/tonic"
 version = "0.6.2"
 
 [dependencies]
+prettyplease = {version = "0.1"}
 proc-macro2 = "1.0"
 prost-build = {version = "0.9", optional = true}
 quote = "1.0"
 syn = "1.0"
 
 [features]
 compression = []
-default = ["transport", "rustfmt", "prost"]
+default = ["transport", "prost"]
 prost = ["prost-build"]
-rustfmt = []
 transport = []
 
 [package.metadata.docs.rs]

tonic-build/README.md

@@ -4,8 +4,6 @@ Compiles proto files via prost and generates service stubs and proto definitione
 
 ## Features
 
-- rustfmt: This feature enables the use of rustfmt to format the output code this makes the code readable and the error messages nice. This requires that rustfmt is installed. This is enabled by default.
-
 Required dependencies
 
 ```toml
@@ -103,4 +101,4 @@ pub mod google {
     }
 }
 ```
-See [the example here](https://github.com/hyperium/tonic/tree/master/examples/src/gcp)
+See [the example here](https://github.com/hyperium/tonic/tree/master/examples/src/gcp)

tonic-build/src/lib.rs

@@ -1,12 +1,6 @@
 //! `tonic-build` compiles `proto` files via `prost` and generates service stubs
 //! and proto definitiones for use with `tonic`.
 //!
-//! # Features
-//!
-//! - `rustfmt`: This feature enables the use of `rustfmt` to format the output code
-//! this makes the code readable and the error messages nice. This requires that `rustfmt`
-//! is installed. This is enabled by default.
-//!
 //! # Required dependencies
 //!
 //! ```toml
@@ -85,13 +79,6 @@ mod prost;
 #[cfg_attr(docsrs, doc(cfg(feature = "prost")))]
 pub use prost::{compile_protos, configure, Builder};
 
-#[cfg(feature = "rustfmt")]
-#[cfg_attr(docsrs, doc(cfg(feature = "rustfmt")))]
-use std::io::{self, Write};
-#[cfg(feature = "rustfmt")]
-#[cfg_attr(docsrs, doc(cfg(feature = "rustfmt")))]
-use std::process::{exit, Command};
-
 /// Service code generation for client
 pub mod client;
 /// Service code generation for Server
@@ -217,42 +204,6 @@ fn generate_attributes<'a>(
         .collect::<Vec<_>>()
 }
 
-/// Format files under the out_dir with rustfmt
-#[cfg(feature = "rustfmt")]
-#[cfg_attr(docsrs, doc(cfg(feature = "rustfmt")))]
-pub fn fmt(out_dir: &str) {
-    let dir = std::fs::read_dir(out_dir).unwrap();
-
-    for entry in dir {
-        let file = entry.unwrap().file_name().into_string().unwrap();
-        if !file.ends_with(".rs") {
-            continue;
-        }
-        let result =
-            Command::new(std::env::var("RUSTFMT").unwrap_or_else(|_| "rustfmt".to_owned()))
-                .arg("--emit")
-                .arg("files")
-                .arg("--edition")
-                .arg("2018")
-                .arg(format!("{}/{}", out_dir, file))
-                .output();
-
-        match result {
-            Err(e) => {
-                eprintln!("error running rustfmt: {:?}", e);
-                exit(1)
-            }
-            Ok(output) => {
-                if !output.status.success() {
-                    io::stdout().write_all(&output.stdout).unwrap();
-                    io::stderr().write_all(&output.stderr).unwrap();
-                    exit(output.status.code().unwrap_or(1))
-                }
-            }
-        }
-    }
-}
-
 // Generate a singular line of a doc comment
 fn generate_doc_comment<S: AsRef<str>>(comment: S) -> TokenStream {
     let mut doc_stream = TokenStream::new();

tonic-build/src/prost.rs

@@ -22,8 +22,6 @@ pub fn configure() -> Builder {
         client_attributes: Attributes::default(),
         proto_path: "super".to_string(),
         compile_well_known_types: false,
-        #[cfg(feature = "rustfmt")]
-        format: true,
         emit_package: true,
         protoc_args: Vec::new(),
         include_file: None,
@@ -184,7 +182,8 @@ impl prost_build::ServiceGenerator for ServiceGenerator {
                 #clients
             };
 
-            let code = format!("{}", client_service);
+            let ast: syn::File = syn::parse2(client_service).expect("not a valid tokenstream");
+            let code = prettyplease::unparse(&ast);
             buf.push_str(&code);
 
             self.clients = TokenStream::default();
@@ -197,7 +196,8 @@ impl prost_build::ServiceGenerator for ServiceGenerator {
                 #servers
             };
 
-            let code = format!("{}", server_service);
+            let ast: syn::File = syn::parse2(server_service).expect("not a valid tokenstream");
+            let code = prettyplease::unparse(&ast);
             buf.push_str(&code);
 
             self.servers = TokenStream::default();
@@ -223,8 +223,6 @@ pub struct Builder {
     pub(crate) include_file: Option<PathBuf>,
 
     out_dir: Option<PathBuf>,
-    #[cfg(feature = "rustfmt")]
-    format: bool,
 }
 
 impl Builder {
@@ -247,13 +245,6 @@ impl Builder {
         self
     }
 
-    /// Enable the output to be formated by rustfmt.
-    #[cfg(feature = "rustfmt")]
-    pub fn format(mut self, run: bool) -> Self {
-        self.format = run;
-        self
-    }
-
     /// Set the output directory to generate code to.
     ///
     /// Defaults to the `OUT_DIR` environment variable.
@@ -397,9 +388,6 @@ impl Builder {
             PathBuf::from(std::env::var("OUT_DIR").unwrap())
         };
 
-        #[cfg(feature = "rustfmt")]
-        let format = self.format;
-
         config.out_dir(out_dir.clone());
         if let Some(path) = self.file_descriptor_set_path.as_ref() {
             config.file_descriptor_set_path(path);
@@ -428,13 +416,6 @@ impl Builder {
 
         config.compile_protos(protos, includes)?;
 
-        #[cfg(feature = "rustfmt")]
-        {
-            if format {
-                super::fmt(out_dir.to_str().expect("Expected utf8 out_dir"));
-            }
-        }
-
         Ok(())
     }
 }

tonic-health/Cargo.toml

@@ -15,8 +15,7 @@ repository = "https://github.com/hyperium/tonic"
 version = "0.5.0"
 
 [features]
-default = ["transport", "rustfmt"]
-rustfmt = ["tonic-build/rustfmt"]
+default = ["transport"]
 transport = ["tonic/transport", "tonic-build/transport"]
 
 [dependencies]

tonic-health/build.rs

@@ -8,7 +8,6 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         .file_descriptor_set_path(grpc_health_v1_descriptor_set_path)
         .build_server(true)
         .build_client(true)
-        .format(false)
         .compile(&["proto/health.proto"], &["proto/"])?;
 
     Ok(())

tonic-reflection/Cargo.toml

@@ -16,10 +16,6 @@ readme = "README.md"
 repository = "https://github.com/hyperium/tonic"
 version = "0.3.0"
 
-[features]
-default = ["rustfmt"]
-rustfmt = ["tonic-build/rustfmt"]
-
 [dependencies]
 bytes = "1.0"
 prost = "0.9"

tonic-reflection/build.rs

@@ -13,7 +13,6 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         )
         .build_server(true)
         .build_client(true) // Client is only used for tests
-        .format(true)
         .compile(&["proto/reflection.proto"], &["proto/"])?;
 
     Ok(())