feat(scaffolding): add Rust package generator

tools/scaffolding/rust_test.rs

@@ -0,0 +1,71 @@
+use std::fs;
+use std::path::Path;
+use std::time::{SystemTime, UNIX_EPOCH};
+
+use super::{crate_name, render_files, scaffold, update_workspace_members};
+
+#[test]
+fn accepts_valid_crate_names() {
+    assert_eq!(crate_name(Path::new("foo_2")).unwrap(), "foo_2");
+}
+
+#[test]
+fn rejects_invalid_crate_names() {
+    assert!(crate_name(Path::new("Foo")).is_err());
+    assert!(crate_name(Path::new("foo-bar")).is_err());
+}
+
+#[test]
+fn renders_crate_name_into_every_file() {
+    for file in render_files("example") {
+        assert!(!file.contents.contains("{CRATE_NAME}"));
+    }
+}
+
+#[test]
+fn adds_workspace_member() {
+    let manifest = "[workspace]\nmembers = [\n    \"src/status\",\n]\n";
+    let updated = update_workspace_members(manifest, "src/example").unwrap();
+
+    assert_eq!(
+        updated,
+        "[workspace]\nmembers = [\n    \"src/status\",\n    \"src/example\",\n]\n"
+    );
+}
+
+#[test]
+fn creates_a_rust_package() {
+    let workspace = std::env::temp_dir().join(format!(
+        "scaffolding-test-{}-{}",
+        std::process::id(),
+        SystemTime::now()
+            .duration_since(UNIX_EPOCH)
+            .unwrap()
+            .as_nanos(),
+    ));
+    fs::create_dir_all(workspace.join("src")).unwrap();
+    fs::write(
+        workspace.join("Cargo.toml"),
+        "[workspace]\nmembers = [\n]\n",
+    )
+    .unwrap();
+
+    let destination = scaffold(&workspace, &workspace.join("src/example")).unwrap();
+
+    assert_eq!(
+        destination,
+        fs::canonicalize(workspace.join("src/example")).unwrap()
+    );
+    assert!(destination.join("BUILD").exists());
+    assert!(destination.join("Cargo.toml").exists());
+    assert!(destination.join("example.rs").exists());
+    assert!(destination.join("example_main.rs").exists());
+    assert!(destination.join("example_test.rs").exists());
+    assert!(
+        fs::read_to_string(workspace.join("Cargo.toml"))
+            .unwrap()
+            .contains("    \"src/example\",")
+    );
+
+    fs::remove_dir_all(workspace).unwrap();
+}