Add --bins and allow --bin to be called multiple times (#241)

* Add --bins flag

* Allow multiple --bin flags to be passed

src/main.rs

@@ -138,10 +138,12 @@ pub struct Cook {
     /// Cook using `#[no_std]` configuration  (does not affect `proc-macro` crates)
     #[clap(long)]
     no_std: bool,
-    /// When --bin is specified, `cargo-chef` will ignore all members of the workspace
-    /// that are not necessary to successfully compile the specific binary.
+    /// Build only the specified binary. This can be specified with multiple binaries.
     #[clap(long)]
-    bin: Option<String>,
+    bin: Option<Vec<String>>,
+    /// Build all binaries and ignore everything else.
+    #[clap(long)]
+    bins: bool,
     /// Run `cargo zigbuild` instead of `cargo build`. You need to install
     /// the `cargo-zigbuild` crate and the Zig compiler toolchain separately
     #[clap(long)]
@@ -185,6 +187,7 @@ fn _main() -> Result<(), anyhow::Error> {
             no_std,
             bin,
             zigbuild,
+            bins,
         }) => {
             if atty::is(atty::Stream::Stdout) {
                 eprintln!("WARNING stdout appears to be a terminal.");
@@ -282,6 +285,7 @@ fn _main() -> Result<(), anyhow::Error> {
                     locked,
                     frozen,
                     verbose,
+                    bins,
                 })
                 .context("Failed to cook recipe.")?;
         }

src/recipe.rs

@@ -43,7 +43,8 @@ pub struct CookArgs {
     pub verbose: bool,
     pub timings: bool,
     pub no_std: bool,
-    pub bin: Option<String>,
+    pub bin: Option<Vec<String>>,
+    pub bins: bool,
 }
 
 impl Recipe {
@@ -109,6 +110,7 @@ fn build_dependencies(args: &CookArgs) {
         timings,
         bin,
         no_std: _no_std,
+        bins,
     } = args;
     let cargo_path = std::env::var("CARGO").expect("The `CARGO` environment variable was not set. This is unexpected: it should always be provided by `cargo` when invoking a custom sub-command, allowing `cargo-chef` to correctly detect which toolchain should be used. Please file a bug.");
     let mut command = Command::new(cargo_path);
@@ -167,7 +169,9 @@ fn build_dependencies(args: &CookArgs) {
         }
     }
     if let Some(binary_target) = bin {
-        command_with_args.arg("--bin").arg(binary_target);
+        for binary_target in binary_target {
+            command_with_args.arg("--bin").arg(binary_target);
+        }
     }
     if *workspace {
         command_with_args.arg("--workspace");
@@ -187,6 +191,9 @@ fn build_dependencies(args: &CookArgs) {
     if *timings {
         command_with_args.arg("--timings");
     }
+    if *bins {
+        command_with_args.arg("--bins");
+    }
 
     execute_command(command_with_args);
 }