install-crate: tty feature to make crossterm and user output optional

Author: Firestar99

crates/cargo-gpu-install/Cargo.toml

@@ -12,6 +12,7 @@ license.workspace = true
 clap = ["dep:clap", "spirv-builder/clap"]
 watch = ["spirv-builder/watch"]
 test = ["dep:tempfile"]
+tty = ["dep:crossterm"]
 
 [dependencies]
 cargo_metadata.workspace = true
@@ -21,7 +22,7 @@ clap = { workspace = true, optional = true }
 directories.workspace = true
 log.workspace = true
 serde.workspace = true
-crossterm.workspace = true
+crossterm = { workspace = true, default-features = false, optional = true }
 tempfile = { workspace = true, optional = true }
 
 [dev-dependencies]

crates/cargo-gpu-install/src/install_toolchain.rs

@@ -1,6 +1,7 @@
 //! toolchain installation logic
 
 use anyhow::Context as _;
+#[cfg(feature = "tty")]
 use crossterm::tty::IsTty as _;
 
 use crate::user_output;
@@ -98,6 +99,20 @@ pub fn ensure_toolchain_and_components_exist(
     Ok(())
 }
 
+#[cfg(not(feature = "tty"))]
+/// Prompt user if they want to install a new Rust toolchain.
+fn get_consent_for_toolchain_install(
+    _prompt: &str,
+    skip_toolchain_install_consent: bool,
+) -> anyhow::Result<()> {
+    if skip_toolchain_install_consent {
+        Ok(())
+    } else {
+        no_tty()
+    }
+}
+
+#[cfg(feature = "tty")]
 /// Prompt user if they want to install a new Rust toolchain.
 fn get_consent_for_toolchain_install(
     prompt: &str,
@@ -108,10 +123,7 @@ fn get_consent_for_toolchain_install(
     }
 
     if !std::io::stdout().is_tty() {
-        user_output!("No TTY detected so can't ask for consent to install Rust toolchain.");
-        log::error!("Attempted to ask for consent when there's no TTY");
-        #[expect(clippy::exit, reason = "can't ask for user consent if there's no TTY")]
-        std::process::exit(1);
+        no_tty()
     }
 
     log::debug!("asking for consent to install the required toolchain");
@@ -143,3 +155,10 @@ fn get_consent_for_toolchain_install(
         std::process::exit(0);
     }
 }
+
+fn no_tty() -> ! {
+    user_output!("No TTY detected so can't ask for consent to install Rust toolchain.");
+    log::error!("Attempted to ask for consent when there's no TTY");
+    #[expect(clippy::exit, reason = "can't ask for user consent if there's no TTY")]
+    std::process::exit(1);
+}

crates/cargo-gpu-install/src/lib.rs

@@ -10,6 +10,7 @@ pub use spirv_builder;
 
 /// Central function to write to the user.
 #[macro_export]
+#[cfg(feature = "tty")]
 macro_rules! user_output {
     ($($args: tt)*) => { {
         #[allow(
@@ -32,6 +33,13 @@ macro_rules! user_output {
    } }
 }
 
+/// Central function to write to the user.
+#[macro_export]
+#[cfg(not(feature = "tty"))]
+macro_rules! user_output {
+    ($($args: tt)*) => {{}};
+}
+
 /// The central cache directory of cargo gpu
 ///
 /// # Errors

crates/cargo-gpu/Cargo.toml

@@ -14,7 +14,7 @@ default-run = "cargo-gpu"
 cargo_metadata.workspace = true
 anyhow.workspace = true
 spirv-builder = { workspace = true, features = ["clap", "watch"] }
-cargo-gpu-install = { workspace = true, features = ["clap", "watch"] }
+cargo-gpu-install = { workspace = true, features = ["clap", "watch", "tty"] }
 clap.workspace = true
 env_logger.workspace = true
 log.workspace = true