Various improvements to cargo-component. (#240)

* Various improvements to `cargo-component`.

This commit includes the following improvements to `cargo-component`:

* `cargo-component` now componentizes based off the presence of component type
  information custom sections rather than always requiring a
  `[package.metadata.component]` section be present in `Cargo.toml`.
* Bindings generation will now occur if a `wit` directory is present and
  `[package.metadata.component]` is not present in `Cargo.toml`.
* Fix a panic in `cargo component add` if it encounters expected items that are
  not tables in `Cargo.toml`.
* Fix not setting implicit tables for intermediate tables for the `cargo
  component add` command.
* Fix not displaying anything when `--help` is present for commands passed
  directly to `cargo`.
* `cargo-component` now uses the command adapter for binary examples and
  test/bench artifacts.
* `cargo-component` now displays the same "Running" message that `cargo` does
  when using the `run`, `test`, and `bench` commands.
* Some paths displayed in status messages have been prefix-stripped based on
  the CWD.

This commit also contains a bit of refactoring to `run_cargo_command`, as it
was getting long and unwieldy.

Fixes #236.

* Remove `Option` from component section in metadata.

This makes using the section more ergonomic.

Cargo.toml

@@ -37,6 +37,7 @@ wit-bindgen-core = { workspace = true }
 wit-parser = { workspace = true }
 wit-component = { workspace = true }
 wasm-metadata = { workspace = true }
+wasmparser = { workspace = true }
 parse_arg = { workspace = true }
 cargo_metadata = { workspace = true }
 cargo-config2 = { workspace = true }
@@ -50,11 +51,11 @@ rpassword = { workspace = true }
 futures = { workspace = true }
 bytes = { workspace = true }
 which = { workspace = true }
+shell-escape = "0.1.5"
 
 [dev-dependencies]
 assert_cmd = { workspace = true }
 predicates = { workspace = true }
-wasmparser = { workspace = true }
 wat = { workspace = true }
 warg-server = { workspace = true }
 tempfile = { workspace = true }

src/bindings.rs

@@ -2,7 +2,7 @@
 
 use crate::{
     last_modified_time,
-    metadata::{ComponentMetadata, Ownership, Target},
+    metadata::{ComponentMetadata, Ownership},
     registry::PackageDependencyResolution,
 };
 use anyhow::{bail, Context, Result};
@@ -277,14 +277,10 @@ impl<'a> BindingsGenerator<'a> {
         import_name_map: &mut HashMap<String, String>,
     ) -> Result<(Resolve, WorldId, Vec<PathBuf>)> {
         let (mut merged, world_id, source_files) =
-            if let Target::Package { name, world, .. } = &resolution.metadata.section.target {
-                Self::target_package(resolution, name, world.as_deref())?
+            if let Some(name) = resolution.metadata.target_package() {
+                Self::target_package(resolution, name, resolution.metadata.target_world())?
             } else if let Some(path) = resolution.metadata.target_path() {
-                Self::target_local_path(
-                    resolution,
-                    &path,
-                    resolution.metadata.section.target.world(),
-                )?
+                Self::target_local_path(resolution, &path, resolution.metadata.target_world())?
             } else {
                 let (merged, world) = Self::target_empty_world(resolution);
                 (merged, world, Vec::new())

src/commands/add.rs

@@ -86,13 +86,6 @@ impl AddCommand {
                 )?,
             };
 
-        let metadata = metadata.with_context(|| {
-            format!(
-                "manifest `{path}` is not a WebAssembly component package",
-                path = package.manifest_path
-            )
-        })?;
-
         let name = match &self.name {
             Some(name) => name,
             None => &self.package.name,
@@ -183,25 +176,39 @@ impl AddCommand {
             )
         })?;
 
+        let metadata = document["package"]["metadata"]
+            .or_insert(Item::Table(Table::new()))
+            .as_table_mut()
+            .context("section `package.metadata` is not a table")?;
+
+        metadata.set_implicit(true);
+
+        let component = metadata["component"]
+            .or_insert(Item::Table(Table::new()))
+            .as_table_mut()
+            .context("section `package.metadata.component` is not a table")?;
+
+        component.set_implicit(true);
+
         let dependencies = if self.target {
-            let target = document["package"]["metadata"]["component"]["target"]
+            let target = component["target"]
                 .or_insert(Item::Table(Table::new()))
                 .as_table_mut()
-                .unwrap();
+                .context("section `package.metadata.component.target` is not a table")?;
+
+            target.set_implicit(true);
 
             target["dependencies"]
                 .or_insert(Item::Table(Table::new()))
                 .as_table_mut()
-                .unwrap()
+                .context(
+                    "section `package.metadata.component.target.dependencies` is not a table",
+                )?
         } else {
-            document["package"]["metadata"]["component"]["dependencies"]
+            component["dependencies"]
+                .or_insert(Item::Table(Table::new()))
                 .as_table_mut()
-                .with_context(|| {
-                    format!(
-                        "failed to find component metadata in manifest file `{path}`",
-                        path = pkg.manifest_path
-                    )
-                })?
+                .context("section `package.metadata.component.dependencies` is not a table")?
         };
 
         body(dependencies)?;

src/commands/publish.rs

@@ -118,13 +118,7 @@ impl PublishCommand {
         })?];
 
         let package = packages[0].package;
-        let component_metadata = packages[0].metadata.as_ref().with_context(|| {
-            format!(
-                "package `{name}` is missing component metadata in manifest `{path}`",
-                name = package.name,
-                path = package.manifest_path
-            )
-        })?;
+        let component_metadata = &packages[0].metadata;
 
         let name = component_metadata.section.package.as_ref().with_context(|| {
             format!(
@@ -153,6 +147,7 @@ impl PublishCommand {
         let cargo_build_args = CargoArguments {
             color: self.common.color,
             verbose: self.common.verbose as usize,
+            help: false,
             quiet: self.common.quiet,
             targets: self.target.clone().into_iter().collect(),
             manifest_path: self.manifest_path.clone(),

src/config.rs

@@ -366,6 +366,8 @@ pub struct CargoArguments {
     pub color: Option<Color>,
     /// The (count of) --verbose argument.
     pub verbose: usize,
+    /// The --help argument.
+    pub help: bool,
     /// The --quiet argument.
     pub quiet: bool,
     /// The --target argument.
@@ -422,7 +424,8 @@ impl CargoArguments {
             .flag("--all", None)
             .flag("--workspace", None)
             .counting("--verbose", Some('v'))
-            .flag("--quiet", Some('q'));
+            .flag("--quiet", Some('q'))
+            .flag("--help", Some('h'));
 
         let mut iter = iter.map(Into::into).peekable();
 
@@ -453,6 +456,7 @@ impl CargoArguments {
                 .map(|v| v.parse())
                 .transpose()?,
             verbose: args.get("--verbose").unwrap().count(),
+            help: args.get("--help").unwrap().count() > 0,
             quiet: args.get("--quiet").unwrap().count() > 0,
             manifest_path: args
                 .get_mut("--manifest-path")
@@ -775,6 +779,7 @@ mod test {
             CargoArguments {
                 color: None,
                 verbose: 0,
+                help: false,
                 quiet: false,
                 targets: Vec::new(),
                 manifest_path: None,
@@ -792,6 +797,7 @@ mod test {
             [
                 "component",
                 "publish",
+                "--help",
                 "-vvv",
                 "--color=auto",
                 "--manifest-path",
@@ -820,6 +826,7 @@ mod test {
             CargoArguments {
                 color: Some(Color::Auto),
                 verbose: 3,
+                help: true,
                 quiet: true,
                 targets: vec!["foo".to_string(), "bar".to_string()],
                 manifest_path: Some("Cargo.toml".into()),