meson: Remove custom build scripts

src/meson.build

@@ -1,32 +1,31 @@
-rust_sources = files(
-  'application.rs',
-  'main.rs',
-  'pipewire_connection.rs',
-  'pipewire_connection/state.rs',
-  'style.css',
-  'view/graph_view.rs',
-  'view/mod.rs',
-  'view/node.rs',
-  'view/port.rs',
-)
+cargo_options = [ '--manifest-path', meson.project_source_root() / 'Cargo.toml' ]
+cargo_options += [ '--target-dir', meson.project_build_root() / 'src' ]
+
+if get_option('profile') == 'default'
+  cargo_options += [ '--release' ]
+  rust_target = 'release'
+  message('Building in release mode')
+else
+  rust_target = 'debug'
+  message('Building in debug mode')
+endif
+
+cargo_env = [ 'CARGO_HOME=' + meson.project_build_root() / 'cargo-home' ]
 
 custom_target(
   'cargo-build',
   build_by_default: true,
-  input: [
-    cargo_sources,
-    rust_sources
-  ],
+  build_always_stale: true,
   output: meson.project_name(),
   console: true,
   install: true,
   install_dir: bindir,
   command: [
-    cargo_script,
-    meson.build_root(),
-    meson.source_root(),
-    '@OUTPUT@',
-    get_option('profile'),
-    meson.project_name(),
+    'env',
+    cargo_env,
+    cargo, 'build',
+    cargo_options,
+    '&&',
+    'cp', 'src' / rust_target / meson.project_name(), '@OUTPUT',
   ],
 )