Add verbose flag to print cargo commands

Also fix minor issue with building test crate for doctests.

Cargo.toml

@@ -18,3 +18,4 @@ serde = { version = "1.0.139", features = ["derive"] }
 tee = "0.1.0"
 toml = "0.5.6"
 clap = { version = "4.0.15", features = ["derive", "wrap_help"] }
+shlex = "1.1.0"

src/command.rs

@@ -18,6 +18,11 @@ pub enum Cargo {
 pub struct Input {
     #[command(subcommand)]
     pub cmd: CargoCmd,
+
+    /// Print the exact commands `cargo-3ds` is running. Note that this does not
+    /// set the verbose flag for cargo itself.
+    #[arg(long, short = 'v')]
+    pub verbose: bool,
 }
 
 /// Run a cargo command. COMMAND will be forwarded to the real
@@ -153,6 +158,10 @@ impl CargoCmd {
                         "--doc".to_string(),
                         "-Z".to_string(),
                         "doctest-xcompile".to_string(),
+                        // doctests don't automatically build the `test` crate,
+                        // so we manually specify it on the command line
+                        "-Z".to_string(),
+                        "build-std=std,test".to_string(),
                     ]);
                 } else {
                     cargo_args.push("--no-run".to_string());
@@ -278,7 +287,7 @@ impl CargoCmd {
     ///
     /// - `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]) {
+    pub fn run_callback(&self, messages: &[Message], verbose: bool) {
         // Process the metadata only for commands that have it/use it
         let config = if self.should_build_3dsx() {
             eprintln!("Getting metadata");
@@ -290,9 +299,9 @@ impl CargoCmd {
 
         // 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::Build(cmd) => cmd.callback(&config, verbose),
+            Self::Run(cmd) => cmd.callback(&config, verbose),
+            Self::Test(cmd) => cmd.callback(&config, verbose),
             Self::New(cmd) => cmd.callback(),
             _ => (),
         }
@@ -327,12 +336,12 @@ 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);
+    fn callback(&self, config: &CTRConfig, verbose: bool) {
+        eprintln!("Building smdh: {}", config.path_smdh().display());
+        build_smdh(config, verbose);
 
         eprintln!("Building 3dsx: {}", config.path_3dsx().display());
-        build_3dsx(config);
+        build_3dsx(config, verbose);
     }
 }
 
@@ -381,26 +390,26 @@ impl Run {
     /// Callback for `cargo 3ds run`.
     ///
     /// This callback handles launching the application via `3dslink`.
-    fn callback(&self, config: &CTRConfig) {
+    fn callback(&self, config: &CTRConfig, verbose: bool) {
         // Run the normal "build" callback
-        self.build_args.callback(config);
+        self.build_args.callback(config, verbose);
 
         eprintln!("Running 3dslink");
-        link(config, self);
+        link(config, self, verbose);
     }
 }
 
 impl Test {
     /// Callback for `cargo 3ds test`.
     ///
     /// This callback handles launching the application via `3dslink`.
-    fn callback(&self, config: &CTRConfig) {
+    fn callback(&self, config: &CTRConfig, verbose: bool) {
         if self.no_run {
             // If the tests don't have to run, use the "build" callback
-            self.run_args.build_args.callback(config)
+            self.run_args.build_args.callback(config, verbose)
         } else {
             // If the tests have to run, use the "run" callback
-            self.run_args.callback(config)
+            self.run_args.callback(config, verbose)
         }
     }
 }

src/lib.rs

@@ -3,7 +3,7 @@ pub mod command;
 use crate::command::{CargoCmd, Run};
 
 use cargo_metadata::{Message, MetadataCommand};
-use command::Test;
+use command::{Input, Test};
 use rustc_version::Channel;
 use semver::Version;
 use serde::Deserialize;
@@ -20,16 +20,20 @@ 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_command(cmd, &message_format);
+pub fn run_cargo(input: &Input, message_format: Option<String>) -> (ExitStatus, Vec<Message>) {
+    let mut command = make_cargo_command(&input.cmd, &message_format);
+
+    if input.verbose {
+        print_command(&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 = match (message_format, cmd) {
+    let buf_reader: &mut dyn BufRead = match (message_format, &input.cmd) {
         // The user presumably cares about the message format if set, 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.
@@ -112,6 +116,23 @@ pub fn make_cargo_command(cmd: &CargoCmd, message_format: &Option<String>) -> Co
     command
 }
 
+fn print_command(command: &Command) {
+    let mut cmd_str = vec![command.get_program().to_string_lossy().to_string()];
+    cmd_str.extend(command.get_args().map(|s| s.to_string_lossy().to_string()));
+
+    eprintln!("Running command:");
+    for (k, v) in command.get_envs() {
+        let v = v.map(|v| v.to_string_lossy().to_string());
+        eprintln!(
+            "   {}={} \\",
+            k.to_string_lossy(),
+            v.map_or_else(String::new, |s| shlex::quote(&s).to_string())
+        );
+    }
+    eprintln!("   {}", shlex::join(cmd_str.iter().map(String::as_str)));
+    eprintln!();
+}
+
 /// Finds the sysroot path of the current toolchain
 pub fn find_sysroot() -> PathBuf {
     let sysroot = env::var("SYSROOT").ok().unwrap_or_else(|| {
@@ -235,8 +256,9 @@ pub fn get_metadata(messages: &[Message]) -> CTRConfig {
 
 /// Builds the smdh using `smdhtool`.
 /// This will fail if `smdhtool` is not within the running directory or in a directory found in $PATH
-pub fn build_smdh(config: &CTRConfig) {
-    let mut process = Command::new("smdhtool")
+pub fn build_smdh(config: &CTRConfig, verbose: bool) {
+    let mut command = Command::new("smdhtool");
+    command
         .arg("--create")
         .arg(&config.name)
         .arg(&config.description)
@@ -245,7 +267,13 @@ pub fn build_smdh(config: &CTRConfig) {
         .arg(config.path_smdh())
         .stdin(Stdio::inherit())
         .stdout(Stdio::inherit())
-        .stderr(Stdio::inherit())
+        .stderr(Stdio::inherit());
+
+    if verbose {
+        print_command(&command);
+    }
+
+    let mut process = command
         .spawn()
         .expect("smdhtool command failed, most likely due to 'smdhtool' not being in $PATH");
 
@@ -258,9 +286,9 @@ pub fn build_smdh(config: &CTRConfig) {
 
 /// Builds the 3dsx using `3dsxtool`.
 /// This will fail if `3dsxtool` is not within the running directory or in a directory found in $PATH
-pub fn build_3dsx(config: &CTRConfig) {
+pub fn build_3dsx(config: &CTRConfig, verbose: bool) {
     let mut command = Command::new("3dsxtool");
-    let mut process = command
+    command
         .arg(&config.target_path)
         .arg(config.path_3dsx())
         .arg(format!("--smdh={}", config.path_smdh().to_string_lossy()));
@@ -269,7 +297,7 @@ pub fn build_3dsx(config: &CTRConfig) {
     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()));
+        command.arg(format!("--romfs={}", romfs_path.to_string_lossy()));
     } else if !is_default_romfs {
         eprintln!(
             "Could not find configured RomFS dir: {}",
@@ -278,7 +306,11 @@ pub fn build_3dsx(config: &CTRConfig) {
         process::exit(1);
     }
 
-    let mut process = process
+    if verbose {
+        print_command(&command);
+    }
+
+    let mut process = command
         .stdin(Stdio::inherit())
         .stdout(Stdio::inherit())
         .stderr(Stdio::inherit())
@@ -294,17 +326,20 @@ 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, run_args: &Run) {
-    let mut process = Command::new("3dslink")
+pub fn link(config: &CTRConfig, run_args: &Run, verbose: bool) {
+    let mut command = Command::new("3dslink");
+    command
         .arg(config.path_3dsx())
         .args(run_args.get_3dslink_args())
         .stdin(Stdio::inherit())
         .stdout(Stdio::inherit())
-        .stderr(Stdio::inherit())
-        .spawn()
-        .unwrap();
+        .stderr(Stdio::inherit());
 
-    let status = process.wait().unwrap();
+    if verbose {
+        print_command(&command);
+    }
+
+    let status = command.spawn().unwrap().wait().unwrap();
 
     if !status.success() {
         process::exit(status.code().unwrap_or(1));

src/main.rs

@@ -18,11 +18,11 @@ fn main() {
         }
     };
 
-    let (status, messages) = run_cargo(&input.cmd, message_format);
+    let (status, messages) = run_cargo(&input, message_format);
 
     if !status.success() {
         process::exit(status.code().unwrap_or(1));
     }
 
-    input.cmd.run_callback(&messages);
+    input.cmd.run_callback(&messages, input.verbose);
 }