Initial use of clap

.gitignore

@@ -1,2 +1,3 @@
 target
-Cargo.lock
+Cargo.lock
+.idea

Cargo.toml

@@ -11,7 +11,7 @@ edition = "2021"
 cargo_metadata = "0.14.0"
 rustc_version = "0.4.0"
 semver = "1.0.10"
-serde = "1.0.111"
-serde_derive = "1.0.111"
+serde = {version = "1.0.139", features = ['derive']}
 tee = "0.1.0"
 toml = "0.5.6"
+clap = { version = "3.2.12", features = ["derive"]}

src/commands/mod.rs

@@ -0,0 +1,39 @@
+use clap::{ArgEnum, Parser};
+use std::fmt::{Display, Formatter};
+
+#[derive(Parser)]
+pub struct Input {
+    #[clap(arg_enum)]
+    pub cmd: CargoCommand,
+    pub cargo_opts: Vec<String>,
+}
+
+#[derive(ArgEnum, Copy, Clone, Ord, PartialOrd, Eq, PartialEq)]
+pub enum CargoCommand {
+    Build,
+    Run,
+    Test,
+    Check,
+    Clippy,
+}
+
+impl CargoCommand {
+    pub fn should_build_3dsx(&self) -> bool {
+        matches!(
+            self,
+            CargoCommand::Build | CargoCommand::Run | CargoCommand::Test
+        )
+    }
+}
+
+impl Display for CargoCommand {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        match self {
+            CargoCommand::Build => write!(f, "build"),
+            CargoCommand::Run => write!(f, "run"),
+            CargoCommand::Test => write!(f, "test"),
+            CargoCommand::Check => write!(f, "check"),
+            CargoCommand::Clippy => write!(f, "clippy"),
+        }
+    }
+}

src/lib.rs

@@ -0,0 +1,348 @@
+extern crate core;
+
+pub mod commands;
+
+use crate::commands::CargoCommand;
+use cargo_metadata::{Message, MetadataCommand};
+use core::fmt;
+use rustc_version::Channel;
+use semver::Version;
+use serde::Deserialize;
+use std::io::{BufRead, BufReader};
+use std::path::{Path, PathBuf};
+use std::process::{Command, ExitStatus, Stdio};
+use std::{env, io, process};
+use tee::TeeReader;
+
+pub fn build_elf(
+    cmd: CargoCommand,
+    message_format: &str,
+    args: &Vec<String>,
+) -> (ExitStatus, Vec<Message>) {
+    let mut command = make_cargo_build_command(cmd, message_format, args);
+    let mut process = command.spawn().unwrap();
+    let command_stdout = process.stdout.take().unwrap();
+
+    let mut tee_reader;
+    let mut stdout_reader;
+    let buf_reader: &mut dyn BufRead = if message_format == "json-render-diagnostics" {
+        stdout_reader = BufReader::new(command_stdout);
+        &mut stdout_reader
+    } else {
+        tee_reader = BufReader::new(TeeReader::new(command_stdout, io::stdout()));
+        &mut tee_reader
+    };
+
+    let messages = Message::parse_stream(buf_reader)
+        .collect::<io::Result<_>>()
+        .unwrap();
+
+    (process.wait().unwrap(), messages)
+}
+
+fn make_cargo_build_command(
+    cmd: CargoCommand,
+    message_format: &str,
+    args: &Vec<String>,
+) -> Command {
+    let rust_flags = env::var("RUSTFLAGS").unwrap_or_default()
+        + &format!(
+            " -L{}/libctru/lib -lctru",
+            env::var("DEVKITPRO").expect("DEVKITPRO is not defined as an environment variable")
+        );
+    let cargo = env::var("CARGO").unwrap_or_else(|_| "cargo".to_string());
+    let sysroot = find_sysroot();
+    let mut command = Command::new(cargo);
+
+    if !sysroot.join("lib/rustlib/armv6k-nintendo-3ds").exists() {
+        eprintln!("No pre-build std found, using build-std");
+        command.arg("-Z").arg("build-std");
+    }
+
+    command
+        .env("RUSTFLAGS", rust_flags)
+        .arg(&cmd.to_string())
+        .arg("--target")
+        .arg("armv6k-nintendo-3ds")
+        .arg("--message-format")
+        .arg(message_format)
+        .args(args)
+        .stdout(Stdio::piped())
+        .stdin(Stdio::inherit())
+        .stderr(Stdio::inherit());
+
+    command
+}
+
+fn find_sysroot() -> PathBuf {
+    let sysroot = env::var("SYSROOT").ok().unwrap_or_else(|| {
+        let rustc = env::var("RUSTC").unwrap_or_else(|_| "rustc".to_string());
+
+        let output = Command::new(&rustc)
+            .arg("--print")
+            .arg("sysroot")
+            .output()
+            .unwrap_or_else(|_| panic!("Failed to run `{rustc} -- print sysroot`"));
+        String::from_utf8(output.stdout).expect("Failed to parse sysroot path into a UTF-8 string")
+    });
+
+    PathBuf::from(sysroot.trim())
+}
+
+pub fn check_rust_version() {
+    let rustc_version = rustc_version::version_meta().unwrap();
+
+    if rustc_version.channel > Channel::Nightly {
+        eprintln!("cargo-3ds requires a nightly rustc version.");
+        eprintln!(
+            "Please run `rustup override set nightly` to use nightly in the \
+            current directory."
+        );
+        process::exit(1);
+    }
+
+    let old_version = MINIMUM_RUSTC_VERSION
+        > Version {
+            // Remove `-nightly` pre-release tag for comparison.
+            pre: semver::Prerelease::EMPTY,
+            ..rustc_version.semver.clone()
+        };
+
+    let old_commit = match rustc_version.commit_date {
+        None => false,
+        Some(date) => {
+            MINIMUM_COMMIT_DATE
+                > CommitDate::parse(&date).expect("could not parse `rustc --version` commit date")
+        }
+    };
+
+    if old_version || old_commit {
+        eprintln!(
+            "cargo-3ds requires rustc nightly version >= {}",
+            MINIMUM_COMMIT_DATE,
+        );
+        eprintln!("Please run `rustup update nightly` to upgrade your nightly version");
+
+        process::exit(1);
+    }
+}
+
+pub fn get_metadata(messages: &[Message]) -> CTRConfig {
+    let metadata = MetadataCommand::new()
+        .exec()
+        .expect("Failed to get cargo metadata");
+
+    let mut package = None;
+    let mut artifact = None;
+
+    // Extract the final built executable. We may want to fail in cases where
+    // multiple executables, or none, were built?
+    for message in messages.iter().rev() {
+        if let Message::CompilerArtifact(art) = message {
+            if art.executable.is_some() {
+                package = Some(metadata[&art.package_id].clone());
+                artifact = Some(art.clone());
+
+                break;
+            }
+        }
+    }
+    if package.is_none() || artifact.is_none() {
+        eprintln!("No executable found from build command output!");
+        process::exit(1);
+    }
+
+    let (package, artifact) = (package.unwrap(), artifact.unwrap());
+
+    let mut icon = String::from("./icon.png");
+
+    if !Path::new(&icon).exists() {
+        icon = format!(
+            "{}/libctru/default_icon.png",
+            env::var("DEVKITPRO").unwrap()
+        );
+    }
+
+    // for now assume a single "kind" since we only support one output artifact
+    let name = match artifact.target.kind[0].as_ref() {
+        "bin" | "lib" | "rlib" | "dylib" if artifact.target.test => {
+            format!("{} tests", artifact.target.name)
+        }
+        "example" => {
+            format!("{} - {} example", artifact.target.name, package.name)
+        }
+        _ => artifact.target.name,
+    };
+
+    let author = match package.authors.as_slice() {
+        [name, ..] => name.to_owned(),
+        [] => String::from("Unspecified Author"), // as standard with the devkitPRO toolchain
+    };
+
+    CTRConfig {
+        name,
+        author,
+        description: package
+            .description
+            .clone()
+            .unwrap_or_else(|| String::from("Homebrew Application")),
+        icon,
+        target_path: artifact.executable.unwrap().into(),
+        cargo_manifest_path: package.manifest_path.into(),
+    }
+}
+
+pub fn build_smdh(config: &CTRConfig) {
+    let mut process = Command::new("smdhtool")
+        .arg("--create")
+        .arg(&config.name)
+        .arg(&config.description)
+        .arg(&config.author)
+        .arg(&config.icon)
+        .arg(config.path_smdh())
+        .stdin(Stdio::inherit())
+        .stdout(Stdio::inherit())
+        .stderr(Stdio::inherit())
+        .spawn()
+        .expect("smdhtool command failed, most likely due to 'smdhtool' not being in $PATH");
+
+    let status = process.wait().unwrap();
+
+    if !status.success() {
+        process::exit(status.code().unwrap_or(1));
+    }
+}
+
+pub fn build_3dsx(config: &CTRConfig) {
+    let mut command = Command::new("3dsxtool");
+    let mut process = command
+        .arg(&config.target_path)
+        .arg(config.path_3dsx())
+        .arg(format!("--smdh={}", config.path_smdh().to_string_lossy()));
+
+    // If romfs directory exists, automatically include it
+    let (romfs_path, is_default_romfs) = get_romfs_path(config);
+    if romfs_path.is_dir() {
+        println!("Adding RomFS from {}", romfs_path.display());
+        process = process.arg(format!("--romfs={}", romfs_path.to_string_lossy()));
+    } else if !is_default_romfs {
+        eprintln!(
+            "Could not find configured RomFS dir: {}",
+            romfs_path.display()
+        );
+        process::exit(1);
+    }
+
+    let mut process = process
+        .stdin(Stdio::inherit())
+        .stdout(Stdio::inherit())
+        .stderr(Stdio::inherit())
+        .spawn()
+        .expect("3dsxtool command failed, most likely due to '3dsxtool' not being in $PATH");
+
+    let status = process.wait().unwrap();
+
+    if !status.success() {
+        process::exit(status.code().unwrap_or(1));
+    }
+}
+
+pub fn link(config: &CTRConfig) {
+    let mut process = Command::new("3dslink")
+        .arg(config.path_3dsx())
+        .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));
+    }
+}
+
+/// Read the `RomFS` path from the Cargo manifest. If it's unset, use the default.
+/// The returned boolean is true when the default is used.
+pub fn get_romfs_path(config: &CTRConfig) -> (PathBuf, bool) {
+    let manifest_path = &config.cargo_manifest_path;
+    let manifest_str = std::fs::read_to_string(manifest_path)
+        .unwrap_or_else(|e| panic!("Could not open {}: {e}", manifest_path.display()));
+    let manifest_data: toml::Value =
+        toml::de::from_str(&manifest_str).expect("Could not parse Cargo manifest as TOML");
+
+    // Find the romfs setting and compute the path
+    let mut is_default = false;
+    let romfs_dir_setting = manifest_data
+        .as_table()
+        .and_then(|table| table.get("package"))
+        .and_then(toml::Value::as_table)
+        .and_then(|table| table.get("metadata"))
+        .and_then(toml::Value::as_table)
+        .and_then(|table| table.get("cargo-3ds"))
+        .and_then(toml::Value::as_table)
+        .and_then(|table| table.get("romfs_dir"))
+        .and_then(toml::Value::as_str)
+        .unwrap_or_else(|| {
+            is_default = true;
+            "romfs"
+        });
+    let mut romfs_path = manifest_path.clone();
+    romfs_path.pop(); // Pop Cargo.toml
+    romfs_path.push(romfs_dir_setting);
+
+    (romfs_path, is_default)
+}
+
+#[derive(Deserialize, Default)]
+pub struct CTRConfig {
+    name: String,
+    author: String,
+    description: String,
+    icon: String,
+    target_path: PathBuf,
+    cargo_manifest_path: PathBuf,
+}
+
+impl CTRConfig {
+    pub fn path_3dsx(&self) -> PathBuf {
+        self.target_path.with_extension("3dsx")
+    }
+
+    pub fn path_smdh(&self) -> PathBuf {
+        self.target_path.with_extension("smdh")
+    }
+}
+
+#[derive(Ord, PartialOrd, PartialEq, Eq, Debug)]
+pub struct CommitDate {
+    year: i32,
+    month: i32,
+    day: i32,
+}
+
+impl CommitDate {
+    fn parse(date: &str) -> Option<Self> {
+        let mut iter = date.split('-');
+
+        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)
+    }
+}
+
+const MINIMUM_COMMIT_DATE: CommitDate = CommitDate {
+    year: 2022,
+    month: 6,
+    day: 15,
+};
+const MINIMUM_RUSTC_VERSION: Version = Version::new(1, 63, 0);

src/main.rs

@@ -1,501 +1,70 @@
-use cargo_metadata::{Message, MetadataCommand};
-use rustc_version::{Channel, Version};
-use std::io::{BufRead, BufReader};
-use std::path::{Path, PathBuf};
-use std::process::ExitStatus;
-use std::{
-    env, fmt, io,
-    process::{self, Command, Stdio},
-};
-use tee::TeeReader;
-
-#[derive(serde_derive::Deserialize, Default)]
-struct CTRConfig {
-    name: String,
-    author: String,
-    description: String,
-    icon: String,
-    target_path: PathBuf,
-    cargo_manifest_path: PathBuf,
-}
-
-impl CTRConfig {
-    fn path_3dsx(&self) -> PathBuf {
-        self.target_path.with_extension("3dsx")
-    }
-
-    fn path_smdh(&self) -> PathBuf {
-        self.target_path.with_extension("smdh")
-    }
-}
-
-#[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('-');
-
-        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)
-    }
-}
-
-const MINIMUM_COMMIT_DATE: CommitDate = CommitDate {
-    year: 2022,
-    month: 6,
-    day: 15,
-};
-const MINIMUM_RUSTC_VERSION: Version = Version::new(1, 63, 0);
+use cargo_3ds::commands::{CargoCommand, Input};
+use cargo_3ds::{build_3dsx, build_elf, build_smdh, check_rust_version, get_metadata, link};
+use clap::Parser;
+use std::process;
 
 fn main() {
     check_rust_version();
 
-    if env::args().any(|arg| arg == "--help" || arg == "-h") {
-        print_usage(&mut io::stdout());
-        return;
-    }
-
-    // Get the command and collect the remaining arguments
-    let cargo_command = CargoCommand::from_args().unwrap_or_else(|| {
-        print_usage(&mut io::stderr());
-        process::exit(2)
-    });
-
-    eprintln!("Running Cargo");
-    let (status, messages) = cargo_command.build_elf();
-    if !status.success() {
-        process::exit(status.code().unwrap_or(1));
-    }
-
-    if !cargo_command.should_build_3dsx() {
-        return;
-    }
-
-    eprintln!("Getting metadata");
-    let app_conf = get_metadata(&messages);
-
-    eprintln!("Building smdh:{}", app_conf.path_smdh().display());
-    build_smdh(&app_conf);
-
-    eprintln!("Building 3dsx: {}", app_conf.path_3dsx().display());
-    build_3dsx(&app_conf);
-
-    if cargo_command.should_link {
-        eprintln!("Running 3dslink");
-        link(&app_conf);
-    }
-}
-
-struct CargoCommand {
-    command: String,
-    should_link: bool,
-    args: Vec<String>,
-    message_format: String,
-}
-
-impl CargoCommand {
-    const DEFAULT_MESSAGE_FORMAT: &'static str = "json-render-diagnostics";
-
-    fn from_args() -> Option<Self> {
-        // Skip `cargo 3ds`. `cargo-3ds` isn't supported for now
-        let mut args = env::args().skip(2);
-
-        let command = args.next()?;
-        let mut remaining_args: Vec<String> = args.collect();
-
-        let (command, should_link) = match command.as_str() {
-            "run" => ("build".to_string(), true),
-            "test" => {
-                let no_run = String::from("--no-run");
-
-                if remaining_args.contains(&no_run) {
-                    (command, false)
-                } else {
-                    remaining_args.push(no_run);
-                    (command, true)
-                }
-            }
-            _ => (command, false),
-        };
-
-        let message_format = match Self::extract_message_format(&mut remaining_args) {
-            Some(format) => {
-                if !format.starts_with("json") {
-                    eprintln!("error: non-JSON `message-format` is not supported");
-                    process::exit(1);
-                }
-                format
-            }
-            None => Self::DEFAULT_MESSAGE_FORMAT.to_string(),
-        };
-
-        Some(Self {
-            command,
-            should_link,
-            args: remaining_args,
-            message_format,
-        })
-    }
-
-    fn extract_message_format(args: &mut Vec<String>) -> Option<String> {
-        for (i, arg) in args.iter().enumerate() {
-            if arg.starts_with("--message-format") {
-                return {
-                    let arg = args.remove(i);
-
-                    if let Some((_, format)) = arg.split_once('=') {
-                        Some(format.to_string())
-                    } else {
-                        Some(args.remove(i))
-                    }
-                };
-            }
-        }
-
-        None
-    }
-
-    fn build_elf(&self) -> (ExitStatus, Vec<Message>) {
-        let mut command = self.make_cargo_build_command();
-        let mut process = command.spawn().unwrap();
-        let command_stdout = process.stdout.take().unwrap();
-
-        let mut tee_reader;
-        let mut stdout_reader;
-
-        let buf_reader: &mut dyn BufRead = if self.message_format == Self::DEFAULT_MESSAGE_FORMAT {
-            stdout_reader = BufReader::new(command_stdout);
-            &mut stdout_reader
+    let mut input: Input = Input::parse();
+
+    let should_link = input.cmd == CargoCommand::Build
+        || (input.cmd == CargoCommand::Test
+            && if input.cargo_opts.contains(&"--no-run".to_string()) {
+                false
+            } else {
+                input.cargo_opts.push("--no-run".to_string());
+                true
+            });
+
+    let message_format = if let Some(pos) = input
+        .cargo_opts
+        .iter()
+        .position(|s| s.starts_with("--message-format"))
+    {
+        input.cargo_opts.remove(pos);
+        let format = if let Some((_, format)) = input
+            .cargo_opts
+            .get(pos)
+            .unwrap()
+            .to_string()
+            .split_once('=')
+        {
+            format.to_string()
         } else {
-            // The user presumably cares about the message format, so we should
-            // copy stuff to stdout like they expect. We can still extract the executable
-            // information out of it that we need for 3dsxtool etc.
-            tee_reader = BufReader::new(TeeReader::new(command_stdout, io::stdout()));
-            &mut tee_reader
+            input.cargo_opts.remove(pos).to_string()
         };
-
-        let messages = Message::parse_stream(buf_reader)
-            .collect::<io::Result<_>>()
-            .unwrap();
-
-        (process.wait().unwrap(), messages)
-    }
-
-    /// Create the cargo build command, but don't execute it.
-    /// If there is no pre-built std detected in the sysroot, `build-std` is used.
-    fn make_cargo_build_command(&self) -> Command {
-        let rustflags = env::var("RUSTFLAGS").unwrap_or_default()
-            + &format!(" -L{}/libctru/lib -lctru", env::var("DEVKITPRO").expect("DEVKITPRO is not defined as an environment variable"));
-        let cargo = env::var("CARGO").unwrap_or_else(|_| "cargo".to_string());
-        let sysroot = Self::find_sysroot();
-        let mut command = Command::new(cargo);
-
-        if !sysroot.join("lib/rustlib/armv6k-nintendo-3ds").exists() {
-            eprintln!("No pre-built std found, using build-std");
-            command.arg("-Z").arg("build-std");
-        }
-
-        command
-            .env("RUSTFLAGS", rustflags)
-            .arg(&self.command)
-            .arg("--target")
-            .arg("armv6k-nintendo-3ds")
-            .arg("--message-format")
-            .arg(&self.message_format)
-            .args(&self.args)
-            .stdout(Stdio::piped())
-            .stdin(Stdio::inherit())
-            .stderr(Stdio::inherit());
-
-        command
-    }
-
-    /// Get the compiler's sysroot path
-    fn find_sysroot() -> PathBuf {
-        let sysroot = env::var("SYSROOT").ok().unwrap_or_else(|| {
-            // Get sysroot from rustc
-            let rustc = env::var("RUSTC").unwrap_or_else(|_| "rustc".to_string());
-
-            let output = Command::new(&rustc)
-                .arg("--print")
-                .arg("sysroot")
-                .output()
-                .unwrap_or_else(|_| panic!("Failed to run `{rustc} --print sysroot`"));
-
-            String::from_utf8(output.stdout)
-                .expect("Failed to parse sysroot path into a UTF-8 string")
-        });
-
-        PathBuf::from(sysroot.trim())
-    }
-
-    fn should_build_3dsx(&self) -> bool {
-        matches!(self.command.as_str(), "build" | "run" | "test")
-    }
-}
-
-fn print_usage(f: &mut impl io::Write) {
-    let invocation = {
-        let mut args = env::args();
-
-        // We do this to properly display `cargo-3ds` if invoked that way
-        let bin = args.next().unwrap();
-        if let Some("3ds") = args.next().as_deref() {
-            "cargo 3ds".to_string()
+        if !format.starts_with("json") {
+            eprintln!("error: non-JSON `message-format` is not supported");
+            process::exit(1);
         } else {
-            bin
-        }
-    };
-
-    writeln!(
-        f,
-        "{name}: {description}.
-
-Usage:
-    {invocation} build [CARGO_OPTS...]
-    {invocation} run [CARGO_OPTS...]
-    {invocation} test [CARGO_OPTS...]
-    {invocation} <cargo-command> [CARGO_OPTS...]
-    {invocation} -h | --help
-
-Commands:
-    build           build a 3dsx executable.
-    run             build a 3dsx executable and send it to a device with 3dslink.
-    test            build a 3dsx executable from unit/integration tests and send it to a device.
-    <cargo-command> execute some other Cargo command with 3ds options configured (ex. check or clippy).
-
-Options:
-    -h --help       Show this screen.
-
-Additional arguments will be passed through to `<cargo-command>`. Some that are supported include:
-
-    [build | run | test] --release
-    test --no-run
-
-Other flags may work, but haven't been tested.
-",
-        name = env!("CARGO_BIN_NAME"),
-        description = env!("CARGO_PKG_DESCRIPTION"),
-        invocation = invocation,
-    )
-    .unwrap();
-}
-
-fn check_rust_version() {
-    let rustc_version = rustc_version::version_meta().unwrap();
-
-    if rustc_version.channel > Channel::Nightly {
-        eprintln!("cargo-3ds requires a nightly rustc version.");
-        eprintln!(
-            "Please run `rustup override set nightly` to use nightly in the \
-            current directory."
-        );
-        process::exit(1);
-    }
-
-    let old_version = MINIMUM_RUSTC_VERSION > Version {
-        // Remove `-nightly` pre-release tag for comparison.
-        pre: semver::Prerelease::EMPTY,
-        ..rustc_version.semver.clone()
-    };
-    
-    let old_commit = match rustc_version.commit_date {
-        None => false,
-        Some(date) => {
-            MINIMUM_COMMIT_DATE
-                > CommitDate::parse(&date).expect("could not parse `rustc --version` commit date")
-        }
-    };
-
-    if old_version || old_commit {
-        eprintln!(
-            "cargo-3ds requires rustc nightly version >= {}",
-            MINIMUM_COMMIT_DATE,
-        );
-        eprintln!("Please run `rustup update nightly` to upgrade your nightly version");
-
-        process::exit(1);
-    }
-}
-
-fn get_metadata(messages: &[Message]) -> CTRConfig {
-    let metadata = MetadataCommand::new()
-        .exec()
-        .expect("Failed to get cargo metadata");
-
-    let mut package = None;
-    let mut artifact = None;
-
-    // Extract the final built executable. We may want to fail in cases where
-    // multiple executables, or none, were built?
-    for message in messages.iter().rev() {
-        if let Message::CompilerArtifact(art) = message {
-            if art.executable.is_some() {
-                package = Some(metadata[&art.package_id].clone());
-                artifact = Some(art.clone());
-
-                break;
-            }
+            format
         }
-    }
-    if package.is_none() || artifact.is_none() {
-        eprintln!("No executable found from build command output!");
-        process::exit(1);
-    }
-
-    let (package, artifact) = (package.unwrap(), artifact.unwrap());
-
-    let mut icon = String::from("./icon.png");
-
-    if !Path::new(&icon).exists() {
-        icon = format!(
-            "{}/libctru/default_icon.png",
-            env::var("DEVKITPRO").unwrap()
-        );
-    }
-
-    // for now assume a single "kind" since we only support one output artifact
-    let name = match artifact.target.kind[0].as_ref() {
-        "bin" | "lib" | "rlib" | "dylib" if artifact.target.test => {
-            format!("{} tests", artifact.target.name)
-        }
-        "example" => {
-            format!("{} - {} example", artifact.target.name, package.name)
-        }
-        _ => artifact.target.name,
+    } else {
+        "json-render-diagnostics".to_string()
     };
 
-    let author = match package.authors.as_slice() {
-        [name, ..] => name.to_owned(),
-        [] => String::from("Unspecified Author"), // as standard with the devkitPRO toolchain
-    };
-
-    CTRConfig {
-        name,
-        author,
-        description: package
-            .description
-            .clone()
-            .unwrap_or_else(|| String::from("Homebrew Application")),
-        icon,
-        target_path: artifact.executable.unwrap().into(),
-        cargo_manifest_path: package.manifest_path.into(),
-    }
-}
-
-fn build_smdh(config: &CTRConfig) {
-    let mut process = Command::new("smdhtool")
-        .arg("--create")
-        .arg(&config.name)
-        .arg(&config.description)
-        .arg(&config.author)
-        .arg(&config.icon)
-        .arg(config.path_smdh())
-        .stdin(Stdio::inherit())
-        .stdout(Stdio::inherit())
-        .stderr(Stdio::inherit())
-        .spawn()
-        .expect("smdhtool command failed, most likely due to 'smdhtool' not being in $PATH");
-
-    let status = process.wait().unwrap();
+    let (status, messages) = build_elf(input.cmd, &message_format, &input.cargo_opts);
 
     if !status.success() {
         process::exit(status.code().unwrap_or(1));
     }
-}
-
-fn build_3dsx(config: &CTRConfig) {
-    let mut command = Command::new("3dsxtool");
-    let mut process = command
-        .arg(&config.target_path)
-        .arg(config.path_3dsx())
-        .arg(format!("--smdh={}", config.path_smdh().to_string_lossy()));
 
-    // If romfs directory exists, automatically include it
-    let (romfs_path, is_default_romfs) = get_romfs_path(config);
-    if romfs_path.is_dir() {
-        eprintln!("Adding RomFS from {}", romfs_path.display());
-        process = process.arg(format!("--romfs={}", romfs_path.to_string_lossy()));
-    } else if !is_default_romfs {
-        eprintln!(
-            "Could not find configured RomFS dir: {}",
-            romfs_path.display()
-        );
-        process::exit(1);
+    if !input.cmd.should_build_3dsx() {
+        return;
     }
 
-    let mut process = process
-        .stdin(Stdio::inherit())
-        .stdout(Stdio::inherit())
-        .stderr(Stdio::inherit())
-        .spawn()
-        .expect("3dsxtool command failed, most likely due to '3dsxtool' not being in $PATH");
-
-    let status = process.wait().unwrap();
-
-    if !status.success() {
-        process::exit(status.code().unwrap_or(1));
-    }
-}
+    println!("Getting metadata");
+    let app_conf = get_metadata(&messages);
 
-fn link(config: &CTRConfig) {
-    let mut process = Command::new("3dslink")
-        .arg(config.path_3dsx())
-        .stdin(Stdio::inherit())
-        .stdout(Stdio::inherit())
-        .stderr(Stdio::inherit())
-        .spawn()
-        .unwrap();
+    println!("Building smdh:{}", app_conf.path_smdh().display());
+    build_smdh(&app_conf);
 
-    let status = process.wait().unwrap();
+    println!("Building 3dsx: {}", app_conf.path_3dsx().display());
+    build_3dsx(&app_conf);
 
-    if !status.success() {
-        process::exit(status.code().unwrap_or(1));
+    if should_link {
+        println!("Running 3dslink");
+        link(&app_conf);
     }
 }
-
-/// Read the `RomFS` path from the Cargo manifest. If it's unset, use the default.
-/// The returned boolean is true when the default is used.
-fn get_romfs_path(config: &CTRConfig) -> (PathBuf, bool) {
-    let manifest_path = &config.cargo_manifest_path;
-    let manifest_str = std::fs::read_to_string(manifest_path)
-        .unwrap_or_else(|e| panic!("Could not open {}: {e}", manifest_path.display()));
-    let manifest_data: toml::Value =
-        toml::de::from_str(&manifest_str).expect("Could not parse Cargo manifest as TOML");
-
-    // Find the romfs setting and compute the path
-    let mut is_default = false;
-    let romfs_dir_setting = manifest_data
-        .as_table()
-        .and_then(|table| table.get("package"))
-        .and_then(toml::Value::as_table)
-        .and_then(|table| table.get("metadata"))
-        .and_then(toml::Value::as_table)
-        .and_then(|table| table.get("cargo-3ds"))
-        .and_then(toml::Value::as_table)
-        .and_then(|table| table.get("romfs_dir"))
-        .and_then(toml::Value::as_str)
-        .unwrap_or_else(|| {
-            is_default = true;
-            "romfs"
-        });
-    let mut romfs_path = manifest_path.clone();
-    romfs_path.pop(); // Pop Cargo.toml
-    romfs_path.push(romfs_dir_setting);
-
-    (romfs_path, is_default)
-}