Cargo command to work with Nintendo 3DS project binaries.
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use cargo_metadata::MetadataCommand;
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use rustc_version::{Channel, Version};
use std::path::Path;
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use std::{
env, fmt,
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process::{self, Command, Stdio},
};
#[derive(serde_derive::Deserialize, Default)]
struct CTRConfig {
name: String,
author: String,
description: String,
icon: String,
}
#[derive(Ord, PartialOrd, PartialEq, Eq, Debug)]
struct CommitDate {
year: i32,
month: i32,
day: i32,
}
impl CommitDate {
fn parse(date: &str) -> Option<Self> {
let mut iter = date.split('-');
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let year = iter.next()?.parse().ok()?;
let month = iter.next()?.parse().ok()?;
let day = iter.next()?.parse().ok()?;
Some(Self { year, month, day })
}
}
impl fmt::Display for CommitDate {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{:04}-{:02}-{:02}", self.year, self.month, self.day)
}
}
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const MINIMUM_COMMIT_DATE: CommitDate = CommitDate {
year: 2021,
month: 10,
day: 1,
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};
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const MINIMUM_RUSTC_VERSION: Version = Version::new(1, 56, 0);
fn main() {
check_rust_version();
let optimization_level = match env::args().any(|arg| arg == "--release") {
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true => String::from("release"),
false => String::from("debug"),
};
// Skip `cargo 3ds`
let mut args = env::args().skip(2);
let command = args.next();
let must_link = match command {
None => panic!("No command specified, try with \"build\" or \"link\""),
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Some(s) => match s.as_str() {
"build" => false,
"link" => true,
_ => panic!("Invalid command, try with \"build\" or \"link\""),
},
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};
build_elf(args);
let app_conf = get_metadata();
build_3dsx(&app_conf, &optimization_level);
if must_link {
link(&app_conf.name, &optimization_level);
}
}
fn check_rust_version() {
let rustc_version = rustc_version::version_meta().unwrap();
if rustc_version.channel > Channel::Nightly {
println!("cargo-3ds requires a nightly rustc version.");
println!(
"Please run `rustup override set nightly` to use nightly in the \
current directory."
);
process::exit(1);
}
let old_version: bool = MINIMUM_RUSTC_VERSION > rustc_version.semver;
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let old_commit = match rustc_version.commit_date {
None => false,
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Some(date) => {
MINIMUM_COMMIT_DATE
> CommitDate::parse(&date).expect("could not parse `rustc --version` commit date")
}
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};
if old_version || old_commit {
println!(
"cargo-3ds requires rustc nightly version >= {}",
MINIMUM_COMMIT_DATE,
);
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println!("Please run `rustup update nightly` to upgrade your nightly version");
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process::exit(1);
}
}
fn build_elf(args: std::iter::Skip<env::Args>) {
let rustflags = format!("-L{}/libctru/lib -lctru ", env::var("DEVKITPRO").unwrap());
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let mut process = Command::new("cargo")
.arg("build")
.arg("-Z")
.arg("build-std")
.arg("--target")
.arg("armv6k-nintendo-3ds")
.args(args)
.env("RUSTFLAGS", rustflags)
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.stdin(Stdio::inherit())
.stdout(Stdio::inherit())
.stderr(Stdio::inherit())
.spawn()
.unwrap();
let status = process.wait().unwrap();
if !status.success() {
process::exit(status.code().unwrap_or(1));
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}
}
fn get_metadata() -> CTRConfig {
let metadata = MetadataCommand::new()
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.exec()
.expect("Failed to get cargo metadata");
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let root_crate = metadata.root_package().expect("No root crate found");
let mut icon = String::from("./icon.png");
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if !Path::new(&icon).exists() {
icon = format!(
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"{}/libctru/default_icon.png",
env::var("DEVKITPRO").unwrap()
)
}
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CTRConfig {
name: root_crate.name.clone(),
author: root_crate.authors[0].clone(),
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description: root_crate
.description
.clone()
.unwrap_or_else(|| String::from("Homebrew Application")),
icon,
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}
}
fn build_3dsx(config: &CTRConfig, opt_lvl: &str) {
let mut process = Command::new("smdhtool")
.arg("--create")
.arg(&config.name)
.arg(&config.description)
.arg(&config.author)
.arg(&config.icon)
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.arg(format!(
"./target/armv6k-nintendo-3ds/{}/{}.smdh",
opt_lvl, config.name
))
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.stdin(Stdio::inherit())
.stdout(Stdio::inherit())
.stderr(Stdio::inherit())
.spawn()
.unwrap();
let status = process.wait().unwrap();
if !status.success() {
process::exit(status.code().unwrap_or(1));
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}
let mut command = Command::new("3dsxtool");
let mut process = command
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.arg(format!(
"./target/armv6k-nintendo-3ds/{}/{}.elf",
opt_lvl, config.name
))
.arg(format!(
"./target/armv6k-nintendo-3ds/{}/{}.3dsx",
opt_lvl, config.name
))
.arg(format!(
"--smdh=./target/armv6k-nintendo-3ds/{}/{}.smdh",
opt_lvl, config.name
));
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// If romfs directory exists, automatically include it
if Path::new("./romfs").is_dir() {
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process = process.arg("--romfs=\"./romfs\"");
}
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let mut process = process
.stdin(Stdio::inherit())
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.stdout(Stdio::inherit())
.stderr(Stdio::inherit())
.spawn()
.unwrap();
let status = process.wait().unwrap();
if !status.success() {
process::exit(status.code().unwrap_or(1));
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}
}
fn link(name: &str, opt_lvl: &str) {
let mut process = Command::new("3dslink")
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.arg(format!(
"./target/armv6k-nintendo-3ds/{}/{}.3dsx",
opt_lvl, name
))
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.stdin(Stdio::inherit())
.stdout(Stdio::inherit())
.stderr(Stdio::inherit())
.spawn()
.unwrap();
let status = process.wait().unwrap();
if !status.success() {
process::exit(status.code().unwrap_or(1));
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}
}