Merge pull request #26 from ian-h-chamberlain/feature/clap4-upgrade-extra-args

Upgrade to clap4, add extra args and help strings

Cargo.toml

@@ -14,4 +14,4 @@ semver = "1.0.10"
 serde = { version = "1.0.139", features = ['derive'] }
 tee = "0.1.0"
 toml = "0.5.6"
-clap = { version = "3.2.12", features = ["derive"]}
+clap = { version = "4.0.15", features = ["derive", "wrap_help"] }

README.md

@@ -1,26 +1,97 @@
 # cargo-3ds
+
 Cargo command to work with Nintendo 3DS project binaries. Based on cargo-psp.
 
-# Usage
+## Usage
+
 Use the nightly toolchain to build 3DS apps (either by using `rustup override nightly` for the project directory or by adding `+nightly` in the `cargo` invocation).
 
-Available commands:
+```txt
-```
+Commands:
-    build           build a 3dsx executable.
+  build
-    run             build a 3dsx executable and send it to a device with 3dslink.
+          Builds an executable suitable to run on a 3DS (3dsx)
-    test            build a 3dsx executable from unit/integration tests and send it to a device.
+  run
-    <cargo-command> execute some other Cargo command with 3ds options configured (ex. check or clippy).
+          Builds an executable and sends it to a device with `3dslink`
-```
+  test
+          Builds a test executable and sends it to a device with `3dslink`
+  help
+          Print this message or the help of the given subcommand(s)
 
-Additional arguments will be passed through to `<cargo-command>`. Some that are supported include:
+Options:
+  -h, --help
+          Print help information (use `-h` for a summary)
+
+  -V, --version
+          Print version information
 ```
-    [build | run | test] --release
+
-    test --no-run
+Additional arguments will be passed through to the given subcommand.
+See [passthrough arguments](#passthrough-arguments) for more details.
+
+It is also possible to pass any other `cargo` command (e.g. `doc`, `check`),
+and all its arguments will be passed through directly to `cargo` unmodified,
+with the proper `RUSTFLAGS` and `--target` set for the 3DS target.
+
+### Basic Examples
+
+* `cargo 3ds build`
+* `cargo 3ds check --verbose`
+* `cargo 3ds run --release --example foo`
+* `cargo 3ds test --no-run`
+
+### Running executables
+
+`cargo 3ds test` and `cargo 3ds run` use the `3dslink` tool to send built
+executables to a device, and thus accept specific related arguments that correspond
+to `3dslink` arguments:
+
+```txt
+-a, --address <ADDRESS>
+      Specify the IP address of the device to send the executable to.
+
+      Corresponds to 3dslink's `--address` arg, which defaults to automatically finding the device.
+
+-0, --argv0 <ARGV0>
+      Set the 0th argument of the executable when running it. Corresponds to 3dslink's `--argv0` argument
+
+-s, --server
+      Start the 3dslink server after sending the executable. Corresponds to 3dslink's `--server` argument
+
+  --retries <RETRIES>
+      Set the number of tries when connecting to the device to send the executable. Corresponds to 3dslink's `--retries` argument
 ```
 
-Other flags and commands may work, but haven't been tested.
+### Passthrough Arguments
+
+Due to the way `cargo-3ds`, `cargo`, and `3dslink` parse arguments, there is
+unfortunately some complexity required when invoking an executable with arguments.
+
+All unrecognized arguments beginning with a dash (e.g. `--release`, `--features`,
+etc.) will be passed through to `cargo` directly.
+
+> **NOTE:** arguments for [running executables](#running-executables) must be
+> specified *before* other unrecognized `cargo` arguments. Otherwise they will
+> be treated as passthrough arguments which will most likely fail the resulting
+> `cargo` command.
+
+An optional `--` may be used to explicitly pass subsequent args to `cargo`, including
+arguments to pass to the executable itself. To separate `cargo` arguments from
+executable arguments, *another* `--` can be used. For example:
+
+* `cargo 3ds run -- -- xyz`
+
+    Builds an executable and send it to a device to run it with the argument `xyz`.
+
+* `cargo 3ds test --address 192.168.0.2 -- -- --test-arg 1`
+
+  Builds a test executable and attempts to send it to a device with the
+  address `192.168.0.2` and run it using the arguments `["--test-arg", "1"]`.
+
+* `cargo 3ds test --address 192.168.0.2 --verbose -- --test-arg 1`
+
+  Build a test executable with `cargo test --verbose`, and attempts to send
+  it to a device with the address `192.168.0.2` and run it using the arguments
+  `["--test-arg", "1"]`.
 
-# Examples
+  This works without two `--` instances because `--verbose` begins the set of
-`cargo 3ds build` \
+  `cargo` arguments and ends the set of 3DS-specific arguments.
-`cargo 3ds run --release` \
-`cargo 3ds test --no-run`

src/command.rs

@@ -1,36 +1,327 @@
-use clap::{AppSettings, Args, Parser, ValueEnum};
+use clap::{Args, Parser, Subcommand};
 
-#[derive(Parser)]
+#[derive(Parser, Debug)]
-#[clap(name = "cargo")]
+#[command(name = "cargo", bin_name = "cargo")]
-#[clap(bin_name = "cargo")]
 pub enum Cargo {
-    #[clap(name = "3ds")]
+    #[command(name = "3ds")]
     Input(Input),
 }
 
-#[derive(Args)]
+#[derive(Args, Debug)]
-#[clap(about)]
+#[command(version, about)]
-#[clap(global_setting(AppSettings::AllowLeadingHyphen))]
 pub struct Input {
-    #[clap(value_enum)]
+    #[command(subcommand)]
-    pub cmd: CargoCommand,
+    pub cmd: CargoCmd,
-    pub cargo_opts: Vec<String>,
 }
 
-#[derive(ValueEnum, Copy, Clone, Ord, PartialOrd, Eq, PartialEq)]
+/// Run a cargo command. COMMAND will be forwarded to the real
-pub enum CargoCommand {
+/// `cargo` with the appropriate arguments for the 3DS target.
-    Build,
+///
-    Run,
+/// If an unrecognized COMMAND is used, it will be passed through unmodified
-    Test,
+/// to `cargo` with the appropriate flags set for the 3DS target.
-    Check,
+#[derive(Subcommand, Debug)]
-    Clippy,
+#[command(allow_external_subcommands = true)]
+pub enum CargoCmd {
+    /// Builds an executable suitable to run on a 3DS (3dsx).
+    Build(RemainingArgs),
+
+    /// Builds an executable and sends it to a device with `3dslink`.
+    Run(Run),
+
+    /// Builds a test executable and sends it to a device with `3dslink`.
+    ///
+    /// This can be used with `--test` for integration tests, or `--lib` for
+    /// unit tests (which require a custom test runner).
+    Test(Test),
+
+    // NOTE: it seems docstring + name for external subcommands are not rendered
+    // in help, but we might as well set them here in case a future version of clap
+    // does include them in help text.
+    /// Run any other `cargo` command with RUSTFLAGS set for the 3DS.
+    #[command(external_subcommand, name = "COMMAND")]
+    Passthrough(Vec<String>),
+}
+
+#[derive(Args, Debug)]
+pub struct RemainingArgs {
+    /// Pass additional options through to the `cargo` command.
+    ///
+    /// All arguments after the first `--`, or starting with the first unrecognized
+    /// option, will be passed through to `cargo` unmodified.
+    ///
+    /// To pass arguments to an executable being run, a *second* `--` must be
+    /// used to disambiguate cargo arguments from executable arguments.
+    /// For example, `cargo 3ds run -- -- xyz` runs an executable with the argument
+    /// `xyz`.
+    #[arg(trailing_var_arg = true)]
+    #[arg(allow_hyphen_values = true)]
+    #[arg(global = true)]
+    #[arg(name = "CARGO_ARGS")]
+    args: Vec<String>,
 }
 
-impl CargoCommand {
+#[derive(Parser, Debug)]
+pub struct Test {
+    /// If set, the built executable will not be sent to the device to run it.
+    #[arg(long)]
+    pub no_run: bool,
+
+    // The test command uses a superset of the same arguments as Run.
+    #[command(flatten)]
+    pub run_args: Run,
+}
+
+#[derive(Parser, Debug)]
+pub struct Run {
+    /// Specify the IP address of the device to send the executable to.
+    ///
+    /// Corresponds to 3dslink's `--address` arg, which defaults to automatically
+    /// finding the device.
+    #[arg(long, short = 'a')]
+    pub address: Option<std::net::Ipv4Addr>,
+
+    /// Set the 0th argument of the executable when running it. Corresponds to
+    /// 3dslink's `--argv0` argument.
+    #[arg(long, short = '0')]
+    pub argv0: Option<String>,
+
+    /// Start the 3dslink server after sending the executable. Corresponds to
+    /// 3dslink's `--server` argument.
+    #[arg(long, short = 's', default_value_t = false)]
+    pub server: bool,
+
+    /// Set the number of tries when connecting to the device to send the executable.
+    /// Corresponds to 3dslink's `--retries` argument.
+    // Can't use `short = 'r'` because that would conflict with cargo's `--release/-r`
+    #[arg(long)]
+    pub retries: Option<usize>,
+
+    // Passthrough cargo options.
+    #[command(flatten)]
+    pub cargo_args: RemainingArgs,
+}
+
+impl CargoCmd {
+    /// Whether or not this command should build a 3DSX executable file.
     pub fn should_build_3dsx(&self) -> bool {
-        matches!(
+        matches!(self, Self::Build(_) | Self::Run(_) | Self::Test(_))
-            self,
+    }
-            CargoCommand::Build | CargoCommand::Run | CargoCommand::Test
+
-        )
+    /// Whether or not the resulting executable should be sent to the 3DS with
+    /// `3dslink`.
+    pub fn should_link_to_device(&self) -> bool {
+        match self {
+            CargoCmd::Test(test) => !test.no_run,
+            CargoCmd::Run(_) => true,
+            _ => false,
+        }
+    }
+
+    pub const DEFAULT_MESSAGE_FORMAT: &str = "json-render-diagnostics";
+
+    pub fn extract_message_format(&mut self) -> Result<Option<String>, String> {
+        Self::extract_message_format_from_args(match self {
+            CargoCmd::Build(args) => &mut args.args,
+            CargoCmd::Run(run) => &mut run.cargo_args.args,
+            CargoCmd::Test(test) => &mut test.run_args.cargo_args.args,
+            CargoCmd::Passthrough(args) => args,
+        })
+    }
+
+    fn extract_message_format_from_args(
+        cargo_args: &mut Vec<String>,
+    ) -> Result<Option<String>, String> {
+        // Checks for a position within the args where '--message-format' is located
+        if let Some(pos) = cargo_args
+            .iter()
+            .position(|s| s.starts_with("--message-format"))
+        {
+            // Remove the arg from list so we don't pass anything twice by accident
+            let arg = cargo_args.remove(pos);
+
+            // Allows for usage of '--message-format=<format>' and also using space separation.
+            // Check for a '=' delimiter and use the second half of the split as the format,
+            // otherwise remove next arg which is now at the same position as the original flag.
+            let format = if let Some((_, format)) = arg.split_once('=') {
+                format.to_string()
+            } else {
+                // Also need to remove the argument to the --message-format option
+                cargo_args.remove(pos)
+            };
+
+            // Non-json formats are not supported so the executable exits.
+            if format.starts_with("json") {
+                Ok(Some(format))
+            } else {
+                Err(String::from(
+                    "error: non-JSON `message-format` is not supported",
+                ))
+            }
+        } else {
+            Ok(None)
+        }
+    }
+}
+
+impl RemainingArgs {
+    /// Get the args to be passed to the executable itself (not `cargo`).
+    pub fn cargo_args(&self) -> &[String] {
+        self.split_args().0
+    }
+
+    /// Get the args to be passed to the executable itself (not `cargo`).
+    pub fn exe_args(&self) -> &[String] {
+        self.split_args().1
+    }
+
+    fn split_args(&self) -> (&[String], &[String]) {
+        if let Some(split) = self.args.iter().position(|s| s == "--") {
+            self.args.split_at(split + 1)
+        } else {
+            (&self.args[..], &[])
+        }
+    }
+}
+
+impl Run {
+    /// Get the args to pass to `3dslink` based on these options.
+    pub fn get_3dslink_args(&self) -> Vec<String> {
+        let mut args = Vec::new();
+
+        if let Some(address) = self.address {
+            args.extend(["--address".to_string(), address.to_string()]);
+        }
+
+        if let Some(argv0) = &self.argv0 {
+            args.extend(["--arg0".to_string(), argv0.clone()]);
+        }
+
+        if let Some(retries) = self.retries {
+            args.extend(["--retries".to_string(), retries.to_string()]);
+        }
+
+        if self.server {
+            args.push("--server".to_string());
+        }
+
+        let exe_args = self.cargo_args.exe_args();
+        if !exe_args.is_empty() {
+            // For some reason 3dslink seems to want 2 instances of `--`, one
+            // in front of all of the args like this...
+            args.extend(["--args".to_string(), "--".to_string()]);
+
+            let mut escaped = false;
+            for arg in exe_args.iter().cloned() {
+                if arg.starts_with('-') && !escaped {
+                    // And one before the first `-` arg that is passed in.
+                    args.extend(["--".to_string(), arg]);
+                    escaped = true;
+                } else {
+                    args.push(arg);
+                }
+            }
+        }
+
+        args
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    use clap::CommandFactory;
+
+    #[test]
+    fn verify_app() {
+        Cargo::command().debug_assert();
+    }
+
+    #[test]
+    fn extract_format() {
+        const CASES: &[(&[&str], Option<&str>)] = &[
+            (&["--foo", "--message-format=json", "bar"], Some("json")),
+            (&["--foo", "--message-format", "json", "bar"], Some("json")),
+            (
+                &[
+                    "--foo",
+                    "--message-format",
+                    "json-render-diagnostics",
+                    "bar",
+                ],
+                Some("json-render-diagnostics"),
+            ),
+            (
+                &["--foo", "--message-format=json-render-diagnostics", "bar"],
+                Some("json-render-diagnostics"),
+            ),
+            (&["--foo", "bar"], None),
+        ];
+
+        for (args, expected) in CASES {
+            let mut cmd = CargoCmd::Build(RemainingArgs {
+                args: args.iter().map(ToString::to_string).collect(),
+            });
+
+            assert_eq!(
+                cmd.extract_message_format().unwrap(),
+                expected.map(ToString::to_string)
+            );
+
+            if let CargoCmd::Build(args) = cmd {
+                assert_eq!(args.args, vec!["--foo", "bar"]);
+            } else {
+                unreachable!();
+            }
+        }
+    }
+
+    #[test]
+    fn extract_format_err() {
+        for args in [&["--message-format=foo"][..], &["--message-format", "foo"]] {
+            let mut cmd = CargoCmd::Build(RemainingArgs {
+                args: args.iter().map(ToString::to_string).collect(),
+            });
+
+            assert!(cmd.extract_message_format().is_err());
+        }
+    }
+
+    #[test]
+    fn split_run_args() {
+        struct TestParam {
+            input: &'static [&'static str],
+            expected_cargo: &'static [&'static str],
+            expected_exe: &'static [&'static str],
+        }
+
+        for param in [
+            TestParam {
+                input: &["--example", "hello-world", "--no-default-features"],
+                expected_cargo: &["--example", "hello-world", "--no-default-features"],
+                expected_exe: &[],
+            },
+            TestParam {
+                input: &["--example", "hello-world", "--", "--do-stuff", "foo"],
+                expected_cargo: &["--example", "hello-world", "--"],
+                expected_exe: &["--do-stuff", "foo"],
+            },
+            TestParam {
+                input: &["--lib", "--", "foo"],
+                expected_cargo: &["--lib", "--"],
+                expected_exe: &["foo"],
+            },
+            TestParam {
+                input: &["foo", "--", "bar"],
+                expected_cargo: &["foo", "--"],
+                expected_exe: &["bar"],
+            },
+        ] {
+            let Run { cargo_args, .. } =
+                Run::parse_from(std::iter::once(&"run").chain(param.input));
+
+            assert_eq!(cargo_args.cargo_args(), param.expected_cargo);
+            assert_eq!(cargo_args.exe_args(), param.expected_exe);
+        }
     }
 }

src/lib.rs

@@ -1,85 +1,32 @@
-extern crate core;
-
 pub mod command;
 
-use crate::command::{CargoCommand, Input};
+use crate::command::CargoCmd;
+
 use cargo_metadata::{Message, MetadataCommand};
-use core::fmt;
 use rustc_version::Channel;
 use semver::Version;
 use serde::Deserialize;
+use tee::TeeReader;
+
+use core::fmt;
 use std::io::{BufRead, BufReader};
 use std::path::{Path, PathBuf};
 use std::process::{Command, ExitStatus, Stdio};
 use std::{env, io, process};
-use tee::TeeReader;
-
-const DEFAULT_MESSAGE_FORMAT: &str = "json-render-diagnostics";
-
-/// Gets whether the executable should link the generated files to a 3ds
-/// based on the parsed input.
-pub fn get_should_link(input: &mut Input) -> bool {
-    // When running compile only commands, don't link the executable to the 3ds.
-    // Otherwise, link and run on the 3ds but do not run locally.
-    match input.cmd {
-        CargoCommand::Run => true,
-        CargoCommand::Test if !input.cargo_opts.contains(&"--no-run".to_string()) => {
-            input.cargo_opts.push("--no-run".to_string());
-            true
-        }
-        _ => false,
-    }
-}
-
-/// Extracts the user-defined message format and if there is none,
-/// default to `json-render-diagnostics`.
-pub fn get_message_format(input: &mut Input) -> String {
-    // Checks for a position within the args where '--message-format' is located
-    if let Some(pos) = input
-        .cargo_opts
-        .iter()
-        .position(|s| s.starts_with("--message-format"))
-    {
-        // Remove the arg from list
-        let arg = input.cargo_opts.remove(pos);
-
-        // Allows for usage of '--message-format=<format>' and also using space separation.
-        // Check for a '=' delimiter and use the second half of the split as the format,
-        // otherwise remove next arg which is now at the same position as the original flag.
-        let format = if let Some((_, format)) = arg.split_once('=') {
-            format.to_string()
-        } else {
-            input.cargo_opts.remove(pos)
-        };
 
-        // Non-json formats are not supported so the executable exits.
+/// Build a command using [`make_cargo_build_command`] and execute it,
-        if !format.starts_with("json") {
+/// parsing and returning the messages from the spawned process.
-            eprintln!("error: non-JSON `message-format` is not supported");
+///
-            process::exit(1);
+/// For commands that produce an executable output, this function will build the
-        } else {
+/// `.elf` binary that can be used to create other 3ds files.
-            format
+pub fn run_cargo(cmd: &CargoCmd, message_format: Option<String>) -> (ExitStatus, Vec<Message>) {
-        }
+    let mut command = make_cargo_build_command(cmd, &message_format);
-    } else {
-        // Default to 'json-render-diagnostics'
-        DEFAULT_MESSAGE_FORMAT.to_string()
-    }
-}
-
-/// Build the elf that will be used to create other 3ds files.
-/// The command built from [`make_cargo_build_command`] is executed
-/// and the messages from the spawned process are parsed and returned.
-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 == DEFAULT_MESSAGE_FORMAT {
+    let buf_reader: &mut dyn BufRead = if message_format.is_none() {
         stdout_reader = BufReader::new(command_stdout);
         &mut stdout_reader
     } else {
@@ -99,11 +46,7 @@ pub fn build_elf(
 
 /// 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.
-pub fn make_cargo_build_command(
+pub fn make_cargo_build_command(cmd: &CargoCmd, message_format: &Option<String>) -> Command {
-    cmd: CargoCommand,
-    message_format: &str,
-    args: &Vec<String>,
-) -> Command {
     let rust_flags = env::var("RUSTFLAGS").unwrap_or_default()
         + &format!(
             " -L{}/libctru/lib -lctru",
@@ -113,28 +56,43 @@ pub fn make_cargo_build_command(
     let sysroot = find_sysroot();
     let mut command = Command::new(cargo);
 
-    let cmd = match cmd {
+    let cmd_str = match cmd {
-        CargoCommand::Build | CargoCommand::Run => "build",
+        CargoCmd::Build(_) | CargoCmd::Run(_) => "build",
-        CargoCommand::Test => "test",
+        CargoCmd::Test(_) => "test",
-        CargoCommand::Check => "check",
+        CargoCmd::Passthrough(cmd) => &cmd[0],
-        CargoCommand::Clippy => "clippy",
     };
 
     command
         .env("RUSTFLAGS", rust_flags)
-        .arg(cmd)
+        .arg(cmd_str)
         .arg("--target")
         .arg("armv6k-nintendo-3ds")
         .arg("--message-format")
-        .arg(message_format);
+        .arg(
+            message_format
+                .as_deref()
+                .unwrap_or(CargoCmd::DEFAULT_MESSAGE_FORMAT),
+        );
 
     if !sysroot.join("lib/rustlib/armv6k-nintendo-3ds").exists() {
         eprintln!("No pre-build std found, using build-std");
         command.arg("-Z").arg("build-std");
     }
 
+    let cargo_args = match cmd {
+        CargoCmd::Build(cargo_args) => cargo_args.cargo_args(),
+        CargoCmd::Run(run) => run.cargo_args.cargo_args(),
+        CargoCmd::Test(test) => {
+            // We can't run 3DS executables on the host, so pass --no-run here and
+            // send the executable with 3dslink later, if the user wants
+            command.arg("--no-run");
+            test.run_args.cargo_args.cargo_args()
+        }
+        CargoCmd::Passthrough(other) => &other[1..],
+    };
+
     command
-        .args(args)
+        .args(cargo_args)
         .stdout(Stdio::piped())
         .stdin(Stdio::inherit())
         .stderr(Stdio::inherit());
@@ -200,7 +158,7 @@ pub fn check_rust_version() {
 
 /// Parses messages returned by the executed cargo command from [`build_elf`].
 /// The returned [`CTRConfig`] is then used for further building in and execution
-/// in [`build_smdh`], ['build_3dsx'], and [`link`].
+/// in [`build_smdh`], [`build_3dsx`], and [`link`].
 pub fn get_metadata(messages: &[Message]) -> CTRConfig {
     let metadata = MetadataCommand::new()
         .exec()
@@ -249,7 +207,7 @@ pub fn get_metadata(messages: &[Message]) -> CTRConfig {
     };
 
     let author = match package.authors.as_slice() {
-        [name, ..] => name.to_owned(),
+        [name, ..] => name.clone(),
         [] => String::from("Unspecified Author"), // as standard with the devkitPRO toolchain
     };
 
@@ -327,9 +285,16 @@ pub fn build_3dsx(config: &CTRConfig) {
 
 /// Link the generated 3dsx to a 3ds to execute and test using `3dslink`.
 /// This will fail if `3dslink` is not within the running directory or in a directory found in $PATH
-pub fn link(config: &CTRConfig) {
+pub fn link(config: &CTRConfig, cmd: &CargoCmd) {
+    let run_args = match cmd {
+        CargoCmd::Run(run) => run,
+        CargoCmd::Test(test) => &test.run_args,
+        _ => unreachable!(),
+    };
+
     let mut process = Command::new("3dslink")
         .arg(config.path_3dsx())
+        .args(run_args.get_3dslink_args())
         .stdin(Stdio::inherit())
         .stdout(Stdio::inherit())
         .stderr(Stdio::inherit())

src/main.rs

@@ -1,9 +1,8 @@
 use cargo_3ds::command::Cargo;
-use cargo_3ds::{
+use cargo_3ds::{build_3dsx, build_smdh, check_rust_version, get_metadata, link, run_cargo};
-    build_3dsx, build_elf, build_smdh, check_rust_version, get_message_format, get_metadata,
+
-    get_should_link, link,
-};
 use clap::Parser;
+
 use std::process;
 
 fn main() {
@@ -11,10 +10,15 @@ fn main() {
 
     let Cargo::Input(mut input) = Cargo::parse();
 
-    let should_link = get_should_link(&mut input);
+    let message_format = match input.cmd.extract_message_format() {
-    let message_format = get_message_format(&mut input);
+        Ok(fmt) => fmt,
+        Err(msg) => {
+            eprintln!("{msg}");
+            process::exit(1)
+        }
+    };
 
-    let (status, messages) = build_elf(input.cmd, &message_format, &input.cargo_opts);
+    let (status, messages) = run_cargo(&input.cmd, message_format);
 
     if !status.success() {
         process::exit(status.code().unwrap_or(1));
@@ -33,8 +37,8 @@ fn main() {
     eprintln!("Building 3dsx: {}", app_conf.path_3dsx().display());
     build_3dsx(&app_conf);
 
-    if should_link {
+    if input.cmd.should_link_to_device() {
         eprintln!("Running 3dslink");
-        link(&app_conf);
+        link(&app_conf, &input.cmd);
     }
 }