Add cargo metadata handling to scouter

scouter/src/lib.rs

@@ -34,7 +34,7 @@ impl Project {
     }
     
     pub fn info(&self) -> ProjectInfo {
-		match self.project_type {
+        match self.project_type {
             ProjectType::Maven => ProjectInfo {
                 name: "placeholder".into(),
                 version: "placeholder".into()
@@ -43,20 +43,37 @@ impl Project {
                 name: "placeholder".into(),
                 version: "placeholder".into()
             },
-            ProjectType::Cargo => ProjectInfo {
-                name: "placeholder".into(),
-                version: "placeholder".into()
-            }
+            ProjectType::Cargo => self.read_cargo_metadata().into()
         }
     }
+    
+    fn read_cargo_metadata(&self) -> cargo_metadata::Metadata {
+        cargo_metadata::MetadataCommand::new().exec().expect("metadata call failed")
+    }
 }
 
 #[derive(Debug)]
 pub struct ProjectInfo {
-	pub name: String,
+    pub name: String,
     pub version: String
 }
 
+impl From<cargo_metadata::Metadata> for ProjectInfo {
+    fn from(metadata: cargo_metadata::Metadata) -> Self {
+        let root_package_id = metadata.resolve
+            .expect("non-existent resolve field")
+            .root
+            .expect("non-existent root package id");
+        let package = metadata.packages.into_iter()
+            .find(|package| package.id == root_package_id)
+            .expect("failed to find package in metadata");
+        ProjectInfo {
+            name: package.name.into(),
+            version: format!("{}", package.version)
+        }     
+    }
+}
+
 pub struct Scouter {
     search_path: PathBuf
 }
@@ -103,6 +120,10 @@ mod test {
     #[test]
     fn test_scouter() {
         let mut scouter = Scouter::new(file!());
-        assert_eq!(ProjectType::Cargo, scouter.next().unwrap().project_type);
+        let project = scouter.next().unwrap();
+        let project_info = project.info();
+        assert_eq!(ProjectType::Cargo, project.project_type);
+        assert_eq!(env!("CARGO_PKG_NAME"), project_info.name);
+        assert_eq!(env!("CARGO_PKG_VERSION"), project_info.version);
     }
 }