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// Copyright (c) 2013-2014 Sandstorm Development Group, Inc. and contributors // Licensed under the MIT License: // // Permission is hereby granted, free of charge, to any person obtaining a copy // of this software and associated documentation files (the "Software"), to deal // in the Software without restriction, including without limitation the rights // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell // copies of the Software, and to permit persons to whom the Software is // furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in // all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN // THE SOFTWARE. //! # Cap'n Proto Schema Compiler Plugin Library //! //! This library allows you to do [Cap'n Proto code generation] //! (https://capnproto.org/otherlang.html#how-to-write-compiler-plugins) //! within a Cargo build. //! //! In your Cargo.toml: //! //! ```ignore //! [package] //! build = "build.rs" //! //! [build-dependencies] //! capnpc = "*" //! ``` //! //! In your build.rs: //! //! ```ignore //! extern crate capnpc; //! //! fn main() { //! ::capnpc::CompilerCommand::new() //! .src_prefix("schema") //! .file("schema/foo.capnp") //! .file("schema/bar.capnp") //! .run().expect("schema compiler command"); //! } //! ``` //! //! This will be equivalent to executing the shell command //! //! ```ignore //! capnp compile -orust:$OUT_DIR --src-prefix=schema schema/foo.capnp schema/bar.capnp //! ``` //! extern crate capnp; /// Code generated from [schema.capnp] /// (https://github.com/sandstorm-io/capnproto/blob/master/c%2B%2B/src/capnp/schema.capnp). pub mod schema_capnp; pub mod codegen; pub mod codegen_types; pub mod schema; use std::path::{Path, PathBuf}; fn run_command(mut command: ::std::process::Command) -> ::capnp::Result<()> { let mut p = try!(command.spawn()); try!(::codegen::main(p.stdout.take().unwrap(), ::std::path::Path::new(&::std::env::var("OUT_DIR").unwrap()))); let exit_status = try!(p.wait()); if !exit_status.success() { Err(::capnp::Error::failed(format!("Non-success exit status: {}", exit_status))) } else { Ok(()) } } /// A builder object for schema compiler commands. pub struct CompilerCommand { files: Vec<PathBuf>, src_prefixes: Vec<PathBuf>, } impl CompilerCommand { /// Creates a new, empty command. pub fn new() -> CompilerCommand { CompilerCommand { files: Vec::new(), src_prefixes: Vec::new(), } } /// Adds a file to be compiled. pub fn file<'a, P>(&'a mut self, path: P) -> &'a mut CompilerCommand where P: AsRef<Path>, { self.files.push(path.as_ref().to_path_buf()); self } /// Adds a --src-prefix flag. For all files specified for compilation that start /// with `prefix`, removes the prefix when computing output filenames. pub fn src_prefix<'a, P>(&'a mut self, prefix: P) -> &'a mut CompilerCommand where P: AsRef<Path>, { self.src_prefixes.push(prefix.as_ref().to_path_buf()); self } /// Runs the command. pub fn run(&mut self) -> ::capnp::Result<()> { let mut command = ::std::process::Command::new("capnp"); command.arg("compile").arg("-o").arg("-"); for src_prefix in &self.src_prefixes { command.arg(&format!("--src-prefix={}", src_prefix.display())); } for file in &self.files { command.arg(&format!("{}", file.display())); } command.stdout(::std::process::Stdio::piped()); command.stderr(::std::process::Stdio::inherit()); run_command(command).map_err(|error| { ::capnp::Error::failed(format!( "Error while trying to execute `capnp compile`: {}. \ Please verify that version 0.5.2 or higher of the capnp executable \ is installed on your system. See https://capnproto.org/install.html", error))}) } }