modules: rust: implement workspace.packages()

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Author: bonzini

docs/markdown/Rust-module.md

@@ -204,6 +204,14 @@ automatically included.
 
 ## Workspace object
 
+### workspace.packages()
+
+```meson
+packages = ws.packages()
+```
+
+Returns a list of package names in the workspace.
+
 ### workspace.subproject()
 
 ```meson

mesonbuild/modules/rust.py

@@ -100,9 +100,17 @@ def __init__(self, interpreter: Interpreter, ws: cargo.WorkspaceState) -> None:
         self.interpreter = interpreter
         self.ws = ws
         self.methods.update({
+            'packages': self.packages_method,
             'subproject': self.subproject_method,
         })
 
+    @noPosargs
+    @noKwargs
+    def packages_method(self, state: ModuleState, args: T.List, kwargs: TYPE_kwargs) -> T.List[str]:
+        """Returns list of package names in workspace."""
+        package_names = [pkg.manifest.package.name for pkg in self.ws.packages.values()]
+        return sorted(package_names)
+
     def _do_subproject(self, pkg: cargo.PackageState) -> None:
         kw: _kwargs.DoSubproject = {
             'required': True,

test cases/rust/31 rust.workspace package/meson.build

@@ -3,6 +3,9 @@ project('package test', 'rust', default_options: ['rust_std=2021'])
 rust = import('rust')
 cargo = rust.workspace()
 
+# Test workspace.packages() method
+assert(cargo.packages() == ['answer', 'hello', 'package_test'])
+
 hello_rs = cargo.subproject('hello')
 answer_rs = cargo.subproject('answer', '2')
 

test cases/rust/31 rust.workspace package/subprojects/answer-2.1/meson.build

@@ -1,6 +1,8 @@
 project('answer', 'rust', default_options: ['rust_std=2021'])
 
 rust = import('rust')
+cargo = rust.workspace()
+assert(cargo.packages() == ['answer'])
 
 l = static_library('answer', 'src/lib.rs')
 dep = declare_dependency(link_with: l)

test cases/rust/32 rust.workspace workspace/meson.build

@@ -3,6 +3,9 @@ project('workspace test', 'rust', default_options: ['rust_std=2021'])
 rust = import('rust')
 cargo = rust.workspace()
 
+# Test workspace.packages() method
+assert(cargo.packages() == ['answer', 'hello', 'workspace_test'])
+
 hello_rs = cargo.subproject('hello')
 answer_rs = cargo.subproject('answer', '2')
 

test cases/rust/32 rust.workspace workspace/subprojects/answer-2.1/meson.build

@@ -1,6 +1,8 @@
 project('answer', 'rust', default_options: ['rust_std=2021'])
 
 rust = import('rust')
+cargo = rust.workspace()
+assert(cargo.packages() == ['answer'])
 
 l = static_library('answer', 'src/lib.rs')
 dep = declare_dependency(link_with: l)