Add a way to have wasm-tools compose print no output (bytecodealliance#2601)

Make it opt-in though.

Author: alexcrichton

crates/wasm-compose/src/composer.rs

@@ -198,7 +198,7 @@ impl<'a> CompositionGraphBuilder<'a> {
                     );
                 }
 
-                log::warn!(
+                log::info!(
                     "instance `{name}` will be imported because a dependency named `{component_name}` could not be found"
                 );
                 Ok(None)

src/bin/wasm-tools/compose.rs

@@ -45,6 +45,10 @@ pub struct Opts {
     /// Output the text format of WebAssembly instead of the binary format.
     #[clap(short = 't', long)]
     wat: bool,
+
+    /// Don't print warnings.
+    #[clap(short, long)]
+    quiet: bool,
 }
 
 impl Opts {
@@ -53,11 +57,13 @@ impl Opts {
     }
 
     pub fn run(self) -> Result<()> {
-        eprintln!("WARNING: `wasm-tools compose` has been deprecated.");
-        eprintln!("");
-        eprintln!(
-            "Please use `wac` instead. You can find more information about `wac` at https://github.com/bytecodealliance/wac."
-        );
+        if !self.quiet {
+            eprintln!("WARNING: `wasm-tools compose` has been deprecated.");
+            eprintln!("");
+            eprintln!(
+                "Please use `wac` instead. You can find more information about `wac` at https://github.com/bytecodealliance/wac."
+            );
+        }
         let config = self.create_config()?;
         log::debug!("configuration:\n{config:#?}");
 
@@ -82,7 +88,9 @@ impl Opts {
         }
 
         if let Some(path) = self.output.output_path() {
-            println!("composed component `{}`", path.display());
+            if !self.quiet {
+                println!("composed component `{}`", path.display());
+            }
         }
 
         Ok(())