Merge pull request #36 from rust3ds/feature/cargo-new

General refactoring and cargo-new

README.md

@@ -14,6 +14,8 @@ Commands:
           Builds an executable and sends it to a device with `3dslink`
   test
           Builds a test executable and sends it to a device with `3dslink`
+  new
+          Sets up a new cargo project suitable to run on a 3DS
   help
           Print this message or the help of the given subcommand(s)
 
@@ -30,7 +32,7 @@ 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.
+with the proper `--target armv6k-nintendo-3ds` set.
 
 ### Basic Examples
 
@@ -38,6 +40,7 @@ with the proper `RUSTFLAGS` and `--target` set for the 3DS target.
 * `cargo 3ds check --verbose`
 * `cargo 3ds run --release --example foo`
 * `cargo 3ds test --no-run`
+* `cargo 3ds new my-new-project --edition 2021`
 
 ### Running executables
 

src/command.rs

@@ -1,5 +1,11 @@
+use std::fs;
+use std::io::Read;
+
+use cargo_metadata::Message;
 use clap::{Args, Parser, Subcommand};
 
+use crate::{build_3dsx, build_smdh, get_metadata, link, CTRConfig};
+
 #[derive(Parser, Debug)]
 #[command(name = "cargo", bin_name = "cargo")]
 pub enum Cargo {
@@ -23,7 +29,7 @@ pub struct Input {
 #[command(allow_external_subcommands = true)]
 pub enum CargoCmd {
     /// Builds an executable suitable to run on a 3DS (3dsx).
-    Build(RemainingArgs),
+    Build(Build),
 
     /// Builds an executable and sends it to a device with `3dslink`.
     Run(Run),
@@ -34,10 +40,13 @@ pub enum CargoCmd {
     /// unit tests (which require a custom test runner).
     Test(Test),
 
+    /// Sets up a new cargo project suitable to run on a 3DS.
+    New(New),
+
     // 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.
+    /// Run any other `cargo` command with custom building tailored for the 3DS.
     #[command(external_subcommand, name = "COMMAND")]
     Passthrough(Vec<String>),
 }
@@ -61,19 +70,10 @@ pub struct RemainingArgs {
 }
 
 #[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,
-
-    /// If set, documentation tests will be built instead of unit tests.
-    /// This implies `--no-run`.
-    #[arg(long)]
-    pub doc: bool,
-
-    // The test command uses a superset of the same arguments as Run.
+pub struct Build {
+    // Passthrough cargo options.
     #[command(flatten)]
-    pub run_args: Run,
+    pub cargo_args: RemainingArgs,
 }
 
 #[derive(Parser, Debug)]
@@ -101,12 +101,99 @@ pub struct Run {
     #[arg(long)]
     pub retries: Option<usize>,
 
-    // Passthrough cargo options.
+    // Passthrough `cargo build` options.
+    #[command(flatten)]
+    pub build_args: Build,
+}
+
+#[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,
+
+    /// If set, documentation tests will be built instead of unit tests.
+    /// This implies `--no-run`.
+    #[arg(long)]
+    pub doc: bool,
+
+    // The test command uses a superset of the same arguments as Run.
+    #[command(flatten)]
+    pub run_args: Run,
+}
+
+#[derive(Parser, Debug)]
+pub struct New {
+    /// Path of the new project.
+    #[arg(required = true)]
+    pub path: String,
+
+    // The test command uses a superset of the same arguments as Run.
     #[command(flatten)]
     pub cargo_args: RemainingArgs,
 }
 
 impl CargoCmd {
+    /// Returns the additional arguments run by the "official" cargo subcommand.
+    pub fn cargo_args(&self) -> Vec<String> {
+        match self {
+            CargoCmd::Build(build) => build.cargo_args.cargo_args(),
+            CargoCmd::Run(run) => run.build_args.cargo_args.cargo_args(),
+            CargoCmd::Test(test) => {
+                let mut cargo_args = test.run_args.build_args.cargo_args.cargo_args();
+
+                // We can't run 3DS executables on the host, so unconditionally pass
+                // --no-run here and send the executable with 3dslink later, if the
+                // user wants
+                if test.doc {
+                    eprintln!("Documentation tests requested, no 3dsx will be built or run");
+
+                    // https://github.com/rust-lang/cargo/issues/7040
+                    cargo_args.append(&mut vec![
+                        "--doc".to_string(),
+                        "-Z".to_string(),
+                        "doctest-xcompile".to_string(),
+                    ]);
+                } else {
+                    cargo_args.push("--no-run".to_string());
+                }
+
+                cargo_args
+            }
+            CargoCmd::New(new) => {
+                // We push the original path in the new command (we captured it in [`New`] to learn about the context)
+                let mut cargo_args = new.cargo_args.cargo_args();
+                cargo_args.push(new.path.clone());
+
+                cargo_args
+            }
+            CargoCmd::Passthrough(other) => other.clone().split_off(1),
+        }
+    }
+
+    /// Returns the cargo subcommand run by `cargo-3ds` when handling a [`CargoCmd`].
+    ///
+    /// # Notes
+    ///
+    /// This is not equivalent to the lowercase name of the [`CargoCmd`] variant.
+    /// Commands may use different commands under the hood to function (e.g. [`CargoCmd::Run`] uses `build`).
+    pub fn subcommand_name(&self) -> &str {
+        match self {
+            CargoCmd::Build(_) | CargoCmd::Run(_) => "build",
+            CargoCmd::Test(_) => "test",
+            CargoCmd::New(_) => "new",
+            CargoCmd::Passthrough(cmd) => &cmd[0],
+        }
+    }
+
+    /// Whether or not this command should compile any code, and thus needs import the custom environment configuration (e.g. target spec).
+    pub fn should_compile(&self) -> bool {
+        matches!(
+            self,
+            Self::Build(_) | Self::Run(_) | Self::Test(_) | Self::Passthrough(_)
+        )
+    }
+
     /// Whether or not this command should build a 3DSX executable file.
     pub fn should_build_3dsx(&self) -> bool {
         matches!(
@@ -129,10 +216,11 @@ impl CargoCmd {
 
     pub fn extract_message_format(&mut self) -> Result<Option<String>, String> {
         let cargo_args = match self {
-            Self::Build(args) => &mut args.args,
-            Self::Run(run) => &mut run.cargo_args.args,
+            Self::Build(build) => &mut build.cargo_args.args,
+            Self::Run(run) => &mut run.build_args.cargo_args.args,
+            Self::New(new) => &mut new.cargo_args.args,
+            Self::Test(test) => &mut test.run_args.build_args.cargo_args.args,
             Self::Passthrough(args) => args,
-            Self::Test(test) => &mut test.run_args.cargo_args.args,
         };
 
         let format = Self::extract_message_format_from_args(cargo_args)?;
@@ -183,25 +271,68 @@ impl CargoCmd {
             Ok(None)
         }
     }
+
+    /// Runs the custom callback *after* the cargo command, depending on the type of command launched.
+    ///
+    /// # Examples
+    ///
+    /// - `cargo 3ds build` and other "build" commands will use their callbacks to build the final `.3dsx` file and link it.
+    /// - `cargo 3ds new` and other generic commands will use their callbacks to make 3ds-specific changes to the environment.
+    pub fn run_callback(&self, messages: &[Message]) {
+        // Process the metadata only for commands that have it/use it
+        let config = if self.should_build_3dsx() {
+            eprintln!("Getting metadata");
+
+            get_metadata(messages)
+        } else {
+            CTRConfig::default()
+        };
+
+        // Run callback only for commands that use it
+        match self {
+            Self::Build(cmd) => cmd.callback(&config),
+            Self::Run(cmd) => cmd.callback(&config),
+            Self::Test(cmd) => cmd.callback(&config),
+            Self::New(cmd) => cmd.callback(),
+            _ => (),
+        }
+    }
 }
 
 impl RemainingArgs {
     /// Get the args to be passed to the executable itself (not `cargo`).
-    pub fn cargo_args(&self) -> &[String] {
+    pub fn cargo_args(&self) -> Vec<String> {
         self.split_args().0
     }
 
     /// Get the args to be passed to the executable itself (not `cargo`).
-    pub fn exe_args(&self) -> &[String] {
+    pub fn exe_args(&self) -> Vec<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)
+    fn split_args(&self) -> (Vec<String>, Vec<String>) {
+        let mut args = self.args.clone();
+
+        if let Some(split) = args.iter().position(|s| s == "--") {
+            let second_half = args.split_off(split + 1);
+
+            (args, second_half)
         } else {
-            (&self.args[..], &[])
+            (args, Vec::new())
+        }
     }
+}
+
+impl Build {
+    /// Callback for `cargo 3ds build`.
+    ///
+    /// This callback handles building the application as a `.3dsx` file.
+    fn callback(&self, config: &CTRConfig) {
+        eprintln!("Building smdh:{}", config.path_smdh().display());
+        build_smdh(config);
+
+        eprintln!("Building 3dsx: {}", config.path_3dsx().display());
+        build_3dsx(config);
     }
 }
 
@@ -226,7 +357,7 @@ impl Run {
             args.push("--server".to_string());
         }
 
-        let exe_args = self.cargo_args.exe_args();
+        let exe_args = self.build_args.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...
@@ -246,6 +377,97 @@ impl Run {
 
         args
     }
+
+    /// Callback for `cargo 3ds run`.
+    ///
+    /// This callback handles launching the application via `3dslink`.
+    fn callback(&self, config: &CTRConfig) {
+        // Run the normal "build" callback
+        self.build_args.callback(config);
+
+        eprintln!("Running 3dslink");
+        link(config, self);
+    }
+}
+
+impl Test {
+    /// Callback for `cargo 3ds test`.
+    ///
+    /// This callback handles launching the application via `3dslink`.
+    fn callback(&self, config: &CTRConfig) {
+        if self.no_run {
+            // If the tests don't have to run, use the "build" callback
+            self.run_args.build_args.callback(config)
+        } else {
+            // If the tests have to run, use the "run" callback
+            self.run_args.callback(config)
+        }
+    }
+}
+
+const TOML_CHANGES: &str = "ctru-rs = { git = \"https://github.com/rust3ds/ctru-rs\" }
+
+[package.metadata.cargo-3ds]
+romfs_dir = \"romfs\"
+";
+
+const CUSTOM_MAIN_RS: &str = "use ctru::prelude::*;
+
+fn main() {
+    ctru::use_panic_handler();
+
+    let apt = Apt::new().unwrap();
+    let mut hid = Hid::new().unwrap();
+    let gfx = Gfx::new().unwrap();
+    let _console = Console::new(gfx.top_screen.borrow_mut());
+
+    println!(\"Hello, World!\");
+    println!(\"\\x1b[29;16HPress Start to exit\");
+
+    while apt.main_loop() {
+        gfx.wait_for_vblank();
+
+        hid.scan_input();
+        if hid.keys_down().contains(KeyPad::START) {
+            break;
+        }
+    }
+}
+";
+
+impl New {
+    /// Callback for `cargo 3ds new`.
+    ///
+    /// This callback handles the custom environment modifications when creating a new 3DS project.
+    fn callback(&self) {
+        // Commmit changes to the project only if is meant to be a binary
+        if self.cargo_args.args.contains(&"--lib".to_string()) {
+            return;
+        }
+
+        // Attain a canonicalised path for the new project and it's TOML manifest
+        let project_path = fs::canonicalize(&self.path).unwrap();
+        let toml_path = project_path.join("Cargo.toml");
+        let romfs_path = project_path.join("romfs");
+        let main_rs_path = project_path.join("src/main.rs");
+
+        // Create the "romfs" directory
+        fs::create_dir(romfs_path).unwrap();
+
+        // Read the contents of `Cargo.toml` to a string
+        let mut buf = String::new();
+        fs::File::open(&toml_path)
+            .unwrap()
+            .read_to_string(&mut buf)
+            .unwrap();
+
+        // Add the custom changes to the TOML
+        let buf = buf + TOML_CHANGES;
+        fs::write(&toml_path, buf).unwrap();
+
+        // Add the custom changes to the main.rs file
+        fs::write(main_rs_path, CUSTOM_MAIN_RS).unwrap();
+    }
 }
 
 #[cfg(test)]
@@ -281,8 +503,10 @@ mod tests {
         ];
 
         for (args, expected) in CASES {
-            let mut cmd = CargoCmd::Build(RemainingArgs {
+            let mut cmd = CargoCmd::Build(Build {
+                cargo_args: RemainingArgs {
                     args: args.iter().map(ToString::to_string).collect(),
+                },
             });
 
             assert_eq!(
@@ -290,8 +514,8 @@ mod tests {
                 expected.map(ToString::to_string)
             );
 
-            if let CargoCmd::Build(args) = cmd {
-                assert_eq!(args.args, vec!["--foo", "bar"]);
+            if let CargoCmd::Build(build) = cmd {
+                assert_eq!(build.cargo_args.args, vec!["--foo", "bar"]);
             } else {
                 unreachable!();
             }
@@ -301,8 +525,10 @@ mod tests {
     #[test]
     fn extract_format_err() {
         for args in [&["--message-format=foo"][..], &["--message-format", "foo"]] {
-            let mut cmd = CargoCmd::Build(RemainingArgs {
+            let mut cmd = CargoCmd::Build(Build {
+                cargo_args: RemainingArgs {
                     args: args.iter().map(ToString::to_string).collect(),
+                },
             });
 
             assert!(cmd.extract_message_format().is_err());
@@ -339,11 +565,11 @@ mod tests {
                 expected_exe: &["bar"],
             },
         ] {
-            let Run { cargo_args, .. } =
+            let Run { build_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);
+            assert_eq!(build_args.cargo_args.cargo_args(), param.expected_cargo);
+            assert_eq!(build_args.cargo_args.exe_args(), param.expected_exe);
         }
     }
 }

src/lib.rs

@@ -1,6 +1,6 @@
 pub mod command;
 
-use crate::command::CargoCmd;
+use crate::command::{CargoCmd, Run};
 
 use cargo_metadata::{Message, MetadataCommand};
 use command::Test;
@@ -21,7 +21,8 @@ use std::{env, io, process};
 /// For commands that produce an executable output, this function will build the
 /// `.elf` binary that can be used to create other 3ds files.
 pub fn run_cargo(cmd: &CargoCmd, message_format: Option<String>) -> (ExitStatus, Vec<Message>) {
-    let mut command = make_cargo_build_command(cmd, &message_format);
+    let mut command = make_cargo_command(cmd, &message_format);
+
     let mut process = command.spawn().unwrap();
     let command_stdout = process.stdout.take().unwrap();
 
@@ -53,27 +54,20 @@ pub fn run_cargo(cmd: &CargoCmd, message_format: Option<String>) -> (ExitStatus,
     (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.
-pub fn make_cargo_build_command(cmd: &CargoCmd, message_format: &Option<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")
-        );
+/// Create a cargo command based on the context.
+///
+/// For "build" commands (which compile code, such as `cargo 3ds build` or `cargo 3ds clippy`),
+/// if there is no pre-built std detected in the sysroot, `build-std` will be used instead.
+pub fn make_cargo_command(cmd: &CargoCmd, message_format: &Option<String>) -> Command {
     let cargo = env::var("CARGO").unwrap_or_else(|_| "cargo".to_string());
-    let sysroot = find_sysroot();
     let mut command = Command::new(cargo);
 
-    let cmd_str = match cmd {
-        CargoCmd::Build(_) | CargoCmd::Run(_) => "build",
-        CargoCmd::Test(_) => "test",
-        CargoCmd::Passthrough(cmd) => &cmd[0],
-    };
+    command.arg(cmd.subcommand_name());
 
+    // Any command that needs to compile code will run under this environment.
+    // Even `clippy` and `check` need this kind of context, so we'll just assume any other `Passthrough` command uses it too.
+    if cmd.should_compile() {
         command
-        .env("RUSTFLAGS", rust_flags)
-        .arg(cmd_str)
             .arg("--target")
             .arg("armv6k-nintendo-3ds")
             .arg("--message-format")
@@ -83,25 +77,14 @@ pub fn make_cargo_build_command(cmd: &CargoCmd, message_format: &Option<String>)
                     .unwrap_or(CargoCmd::DEFAULT_MESSAGE_FORMAT),
             );
 
+        let sysroot = find_sysroot();
         if !sysroot.join("lib/rustlib/armv6k-nintendo-3ds").exists() {
-        eprintln!("No pre-built std found, using build-std");
+            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 unconditionally pass
-            // --no-run here and send the executable with 3dslink later, if the
-            // user wants
-
-            if test.doc {
-                eprintln!("Documentation tests requested, no 3dsx will be built or run");
-
-                // https://github.com/rust-lang/cargo/issues/7040
-                command.args(["--doc", "-Z", "doctest-xcompile"]);
-
+    if matches!(cmd, CargoCmd::Test(_)) {
         // Cargo doesn't like --no-run for doctests:
         // https://github.com/rust-lang/rust/issues/87022
         let rustdoc_flags = std::env::var("RUSTDOCFLAGS").unwrap_or_default()
@@ -109,14 +92,9 @@ pub fn make_cargo_build_command(cmd: &CargoCmd, message_format: &Option<String>)
             + " --no-run --persist-doctests target/doctests";
 
         command.env("RUSTDOCFLAGS", rustdoc_flags);
-            } else {
-                command.arg("--no-run");
     }
 
-            test.run_args.cargo_args.cargo_args()
-        }
-        CargoCmd::Passthrough(other) => &other[1..],
-    };
+    let cargo_args = cmd.cargo_args();
 
     command
         .args(cargo_args)
@@ -180,7 +158,7 @@ pub fn check_rust_version() {
     }
 }
 
-/// Parses messages returned by the executed cargo command from [`build_elf`].
+/// Parses messages returned by "build" cargo commands (such as `cargo 3ds build` or `cargo 3ds run`).
 /// The returned [`CTRConfig`] is then used for further building in and execution
 /// in [`build_smdh`], [`build_3dsx`], and [`link`].
 pub fn get_metadata(messages: &[Message]) -> CTRConfig {
@@ -309,13 +287,7 @@ 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, cmd: &CargoCmd) {
-    let run_args = match cmd {
-        CargoCmd::Run(run) => run,
-        CargoCmd::Test(test) => &test.run_args,
-        _ => unreachable!(),
-    };
-
+pub fn link(config: &CTRConfig, run_args: &Run) {
     let mut process = Command::new("3dslink")
         .arg(config.path_3dsx())
         .args(run_args.get_3dslink_args())
@@ -410,8 +382,8 @@ impl fmt::Display for CommitDate {
 }
 
 const MINIMUM_COMMIT_DATE: CommitDate = CommitDate {
-    year: 2022,
-    month: 6,
-    day: 15,
+    year: 2023,
+    month: 5,
+    day: 31,
 };
-const MINIMUM_RUSTC_VERSION: Version = Version::new(1, 63, 0);
+const MINIMUM_RUSTC_VERSION: Version = Version::new(1, 70, 0);

src/main.rs

@@ -1,5 +1,5 @@
 use cargo_3ds::command::Cargo;
-use cargo_3ds::{build_3dsx, build_smdh, check_rust_version, get_metadata, link, run_cargo};
+use cargo_3ds::{check_rust_version, run_cargo};
 
 use clap::Parser;
 
@@ -24,21 +24,5 @@ fn main() {
         process::exit(status.code().unwrap_or(1));
     }
 
-    if !input.cmd.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 input.cmd.should_link_to_device() {
-        eprintln!("Running 3dslink");
-        link(&app_conf, &input.cmd);
-    }
+    input.cmd.run_callback(&messages);
 }