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Cargo-expand subcommand

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target

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sudo: false
language: rust
rust:
- stable
- beta
- nightly
script:
- cargo build --verbose
notifications:
email: false

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[root]
name = "cargo-expand"
version = "0.1.0"

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[package]
name = "cargo-expand"
version = "0.1.0"
authors = ["David Tolnay <dtolnay@gmail.com>"]
license = "MIT/Apache-2.0"
description = "Wrapper around rustc --pretty=expanded"
repository = "https://github.com/dtolnay/cargo-expand"
documentation = "https://github.com/dtolnay/cargo-expand"
keywords = ["cargo", "subcommand", "expanded"]

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Copyright (c) 2016 cargo-expand Developers
Permission is hereby granted, free of charge, to any
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# cargo-expand
[![Build Status](https://travis-ci.org/dtolnay/cargo-expand.svg?branch=master)](https://travis-ci.org/dtolnay/cargo-expand)
[![Latest Version](https://img.shields.io/crates/v/cargo-expand.svg)](https://crates.io/crates/cargo-expand)
This is a wrapper around `cargo rustc -- --pretty=expanded`. Once installed, the
command `cargo expand` prints out the result of macro expansion applied to the
current crate.
## Installation
Install with `cargo install cargo-expand`.
This command optionally uses
[`rustfmt`](https://github.com/rust-lang-nursery/rustfmt)
to format the expanded output. If `rustfmt` is not available, the expanded code
is not formatted. Install `rustfmt` with `cargo install rustfmt`.
## License
Licensed under either of
* Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
* MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
at your option.
### Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in cargo-expand by you, as defined in the Apache-2.0 license,
shall be dual licensed as above, without any additional terms or conditions.

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use std::env;
use std::io::{self, Write};
use std::process::{self, Command, Stdio};
fn main() {
// Build cargo command
let mut cargo = Command::new("cargo");
cargo.args(&wrap_args(env::args()));
// Run cargo command, print errors, exit if failed
let expanded = cargo.output().unwrap();
for line in String::from_utf8_lossy(&expanded.stderr).lines() {
writeln!(io::stderr(), "{}", line).unwrap();
}
if !expanded.status.success() {
process::exit(expanded.status.code().unwrap_or(1));
}
// Just print the expanded output if rustfmt is not available
if !have_rustfmt() {
io::stdout().write_all(&expanded.stdout).unwrap();
return;
}
// Build rustfmt command and give it the expanded code
let mut rustfmt = Command::new("rustfmt")
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.stderr(Stdio::piped())
.spawn()
.unwrap();
rustfmt.stdin.as_mut().unwrap().write_all(&expanded.stdout).unwrap();
// Print rustfmt errors and exit if failed
let formatted = rustfmt.wait_with_output().unwrap();
for line in String::from_utf8_lossy(&formatted.stderr).lines() {
if !ignore_rustfmt_err(line) {
writeln!(io::stderr(), "{}", line).unwrap();
}
}
if !formatted.status.success() {
let code = formatted.status.code().unwrap_or(1);
// Ignore code 3 which is formatting errors
if code != 3 {
process::exit(code);
}
}
// Print formatted output
io::stdout().write_all(&formatted.stdout).unwrap();
}
// Based on https://github.com/rsolomo/cargo-check
fn wrap_args<T, I>(it: I) -> Vec<String>
where T: AsRef<str>,
I: IntoIterator<Item=T>
{
let mut args = vec!["rustc".to_string()];
let mut has_double_hyphen = false;
for arg in it.into_iter().skip(2) {
let arg = arg.as_ref().to_string();
has_double_hyphen |= &arg == "--";
args.push(arg);
}
if !has_double_hyphen {
args.push("--".to_string());
}
args.push("-Zunstable-options".to_string());
args.push("--pretty=expanded".to_string());
args
}
fn have_rustfmt() -> bool {
Command::new("rustfmt")
.stdin(Stdio::null())
.stdout(Stdio::null())
.stderr(Stdio::null())
.spawn()
.is_ok()
}
fn ignore_rustfmt_err(line: &str) -> bool {
line.is_empty()
|| line.ends_with("line exceeded maximum length (sorry)")
}