fix: use cargo-metadata to support init command in workspace

Cargo.toml

@@ -19,6 +19,7 @@ clap = { version = "4.0.29", features = ["derive", "deprecated"] }
 tempfile = "3.3.0"
 toml = "0.5.9"
 rustc_version = "0.4.0"
+cargo_metadata = "0.18.1"
 
 [dev-dependencies]
 assert_cmd = "2.0.7"

src/project.rs

@@ -1,6 +1,7 @@
 use crate::options::{self, BuildMode, BuildOptions, Sanitizer};
 use crate::utils::default_target;
 use anyhow::{anyhow, bail, Context, Result};
+use cargo_metadata::MetadataCommand;
 use std::collections::HashSet;
 use std::io::Read;
 use std::io::Write;
@@ -931,25 +932,18 @@ pub struct Manifest {
 
 impl Manifest {
     pub fn parse(path: &Path) -> Result<Self> {
-        let contents = fs::read(path)?;
-        let value: toml::Value = toml::from_slice(&contents)?;
-        let package = value
-            .as_table()
-            .and_then(|v| v.get("package"))
-            .and_then(toml::Value::as_table);
-        let crate_name = package
-            .and_then(|v| v.get("name"))
-            .and_then(toml::Value::as_str)
-            .with_context(|| anyhow!("{} (package.name) is malformed", path.display()))?
-            .to_owned();
-        let edition = package
-            .expect("can't be None at this point")
-            .get("edition")
-            .map(|v| match v.as_str() {
-                Some(s) => Ok(s.to_owned()),
-                None => bail!("{} (package.edition) is malformed", path.display()),
-            })
-            .transpose()?;
+        let metatdata = MetadataCommand::new().exec()?;
+        let package = metatdata
+            .packages
+            .iter()
+            .find(|p| p.manifest_path == path)
+            .expect({
+                let path = path.display();
+                &format!("could not find package for {}", path)
+            });
+        let crate_name = package.name.clone();
+        let edition = Some(String::from(package.edition.as_str()));
+
         Ok(Manifest {
             crate_name,
             edition,