xtask: added extendrtests to the check-fmt.

Added a `cargo extendr fmt` that formats `extendr`-crates
and `extendrtests`.

xtask/src/cli/mod.rs

@@ -15,6 +15,8 @@ pub(crate) struct Cli {
 pub(crate) enum Commands {
     #[command(about = "Run cargo fmt on extendr")]
     CheckFmt,
+    #[command(about = "Run `cargo fmt` on extendr crates")]
+    Fmt,
     #[command(about = "Run R CMD check on {extendrtests}")]
     RCmdCheck(RCmdCheckArg),
     #[command(about = "Generate documentation for all features")]

xtask/src/commands/cargo_fmt.rs

@@ -0,0 +1,14 @@
+use xshell::{cmd, Error, Shell};
+
+pub(crate) fn run(shell: &Shell) -> Result<(), Error> {
+    // extendr-api, extendr-macros, extendr-engine, xtask
+    cmd!(shell, "cargo fmt --all").run()?;
+    // extendrtests
+    cmd!(
+        shell,
+        "cargo fmt --all --manifest-path tests/extendrtests/src/rust/Cargo.toml"
+    )
+    .run()?;
+
+    Ok(())
+}

xtask/src/commands/cargo_fmt_check.rs

@@ -1,12 +1,19 @@
 use xshell::{cmd, Error, Shell};
 
 pub(crate) fn run(shell: &Shell) -> Result<(), Error> {
-    let check_result = cmd!(shell, "cargo fmt -- --check").run();
-    if check_result.is_err() {
-        println!("Please run `cargo fmt --all`");
+    let check_extendr = cmd!(shell, "cargo fmt --all -- --check").run();
+
+    let check_extendrtests = cmd!(
+        shell,
+        "cargo fmt --all --manifest-path tests/extendrtests/src/rust/Cargo.toml -- --check"
+    )
+    .run();
+
+    if check_extendr.is_err() || check_extendrtests.is_err() {
+        println!("Please run `cargo extendr fmt`");
     } else {
         println!("Success!");
     }
 
-    check_result
+    check_extendr
 }

xtask/src/commands/mod.rs

@@ -1,3 +1,4 @@
+pub(crate) mod cargo_fmt;
 pub(crate) mod cargo_fmt_check;
 pub(crate) mod cargo_msrv;
 pub(crate) mod devtools_test;

xtask/src/main.rs

@@ -21,6 +21,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
             .canonicalize()?,
     );
     match cli.command {
+        cli::Commands::Fmt => commands::cargo_fmt::run(&shell)?,
         cli::Commands::CheckFmt => commands::cargo_fmt_check::run(&shell)?,
         cli::Commands::RCmdCheck(RCmdCheckArg {
             no_build_vignettes,