[hermes] Finish shadow crate creation

tools/hermes/Cargo.toml

@@ -11,9 +11,11 @@ anyhow = "1.0.101"
 cargo_metadata = "0.23.1"
 clap = { version = "4.5.57", features = ["derive"] }
 clap-cargo = { version = "0.18.3", features = ["cargo_metadata"] }
+dashmap = "6.1.0"
 log = "0.4.29"
 miette = { version = "7.6.0", features = ["derive", "fancy"] }
 proc-macro2 = { version = "1.0.105", features = ["span-locations"] }
+rayon = "1.11.0"
 serde = { version = "1.0.228", features = ["derive"] }
 serde_json = "1.0.149"
 syn = { version = "2.0.114", features = ["full", "visit", "extra-traits", "parsing"] }

tools/hermes/src/main.rs

@@ -17,46 +17,13 @@ struct Cli {
     resolve: resolve::Args,
 }
 
-fn main() {
+fn main() -> anyhow::Result<()> {
     if env::var("HERMES_UI_TEST_MODE").is_ok() {
         ui_test_shim::run();
-        return;
+        return Ok(());
     }
 
     let args = Cli::parse();
-
-    // TODO: Better error handling than `.unwrap()`.
-    let roots = resolve::resolve_roots(&args.resolve).unwrap();
-
-    // TODO: What artifacts need to be updated (not just copied)? E.g., do we
-    // need to update `Cargo.toml` to rewrite relative paths?
-
-    // TODO: From each root, parse and walk referenced modules.
-    let mut has_errors = false;
-    for (package, kind, path) in roots.roots {
-        let mut edits = Vec::new();
-        let res = parse::read_file_and_scan_compilation_unit(&path, |_src, res| {
-            if let Err(e) = res {
-                has_errors = true;
-                eprint!("{:?}", miette::Report::new(e));
-            } else if let Ok(item) = res {
-                transform::append_edits(&item, &mut edits);
-            }
-        });
-
-        let (source, unloaded_modules) = res.unwrap_or_else(|e| {
-            eprintln!("Error parsing file: {}", e);
-            exit(1);
-        });
-
-        if has_errors {
-            exit(1);
-        }
-
-        let mut source = source.into_bytes();
-        transform::apply_edits(&mut source, &edits);
-    }
-
-    // TODO: Create shadow skeleton.
-    // shadow::create_shadow_skeleton(&roots.workspace, &roots.shadow_root, &roots.cargo_target_dir, todo!()).unwrap();
+    let roots = resolve::resolve_roots(&args.resolve)?;
+    shadow::build_shadow_crate(&roots)
 }

tools/hermes/src/resolve.rs

@@ -157,6 +157,11 @@ fn resolve_shadow_path(metadata: &Metadata) -> PathBuf {
     // NOTE: Automatically handles `CARGO_TARGET_DIR` env var.
     let target_dir = metadata.target_directory.as_std_path();
 
+    // Used by integration tests to ensure deterministic shadow dir names.
+    if let Ok(name) = std::env::var("HERMES_TEST_SHADOW_NAME") {
+        return target_dir.join(name);
+    }
+
     // Hash the path to the workspace root to avoid collisions between different
     // workspaces using the same target directory.
     let workspace_root_hash = {
@@ -195,7 +200,10 @@ fn resolve_packages<'a>(
         }
     } else {
         // Resolve default (Current Working Directory)
-        let cwd = env::current_dir().context("Failed to get CWD")?;
+        let cwd = env::current_dir()
+            .context("Failed to get CWD")?
+            .canonicalize()
+            .context("Failed to canonicalize CWD")?;
 
         // Find the package whose manifest directory is an ancestor of CWD
         let current_pkg = metadata.packages.iter().find(|p| {