Print all WIT packages by default

This commit changes the output of `wasm-tools component wit` to by
default output all WIT packages using the multi-package syntax
implemented in bytecodealliance#1577. This means that a complete view of the WIT will be
seen when running this command instead of just the top-level world.

src/bin/wasm-tools/component.rs

@@ -672,8 +672,7 @@ impl WitOpts {
                 self.output.output(
                     &self.general,
                     Output::Wit {
-                        resolve: &resolve,
-                        ids: &main,
+                        wit: &decoded,
                         printer,
                     },
                 )?;

src/lib.rs

@@ -143,8 +143,7 @@ pub struct OutputArg {
 pub enum Output<'a> {
     #[cfg(feature = "component")]
     Wit {
-        resolve: &'a wit_parser::Resolve,
-        ids: &'a [wit_parser::PackageId],
+        wit: &'a wit_component::DecodedWasm,
         printer: wit_component::WitPrinter,
     },
     Wasm(&'a [u8]),
@@ -233,12 +232,14 @@ impl OutputArg {
             }
             Output::Json(s) => self.output_str(s),
             #[cfg(feature = "component")]
-            Output::Wit {
-                resolve,
-                ids,
-                mut printer,
-            } => {
-                let output = printer.print(resolve, ids, false)?;
+            Output::Wit { wit, mut printer } => {
+                let resolve = wit.resolve();
+                let ids = resolve
+                    .packages
+                    .iter()
+                    .map(|(id, _)| id)
+                    .collect::<Vec<_>>();
+                let output = printer.print(resolve, &ids, false)?;
                 self.output_str(&output)
             }
         }

tests/cli/print-core-wasm-wit-multiple-packages.wit.stdout

@@ -1,5 +1,16 @@
-package root:root;
+package root:root {
+  world root {
+    import bar:bar/my-interface;
+  }
+}
+
+
+package bar:bar {
+  interface my-interface {
+    foo: func();
+  }
 
-world root {
-  import bar:bar/my-interface;
+  world my-world {
+    import my-interface;
+  }
 }

tests/cli/print-core-wasm-wit.wit.stdout

@@ -1,5 +1,16 @@
-package root:root;
+package root:root {
+  world root {
+    import foo:foo/my-interface;
+  }
+}
+
+
+package foo:foo {
+  interface my-interface {
+    foo: func();
+  }
 
-world root {
-  import foo:foo/my-interface;
+  world my-world {
+    import my-interface;
+  }
 }