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use std::collections::HashMap; use std::process::Command; use std::str::{from_utf8, Utf8Error}; use std::io; use rustc_serialize::json; #[derive(RustcDecodable, Debug)] pub struct Metadata { pub packages: Vec<Package>, resolve: Option<()>, pub version: usize, } #[derive(RustcDecodable, Debug)] pub struct Package { pub name: String, pub version: String, id: String, source: Option<String>, pub dependencies: Vec<Dependency>, pub targets: Vec<Target>, features: HashMap<String, Vec<String>>, pub manifest_path: String, } #[derive(RustcDecodable, Debug)] pub struct Dependency { pub name: String, source: Option<String>, pub req: String, kind: Option<String>, optional: bool, uses_default_features: bool, features: Vec<String>, target: Option<String>, } #[derive(RustcDecodable, Debug)] pub struct Target { pub name: String, pub kind: Vec<String>, src_path: String, } #[derive(Debug)] pub enum Error { Io(io::Error), Utf8(Utf8Error), Json(json::DecoderError), } impl From<io::Error> for Error { fn from(err: io::Error) -> Self { Error::Io(err) } } impl From<Utf8Error> for Error { fn from(err: Utf8Error) -> Self { Error::Utf8(err) } } impl From<json::DecoderError> for Error { fn from(err: json::DecoderError) -> Self { Error::Json(err) } } pub fn metadata(manifest_path_arg: Option<&str>) -> Result<Metadata, Error> { let mut cmd = Command::new("cargo"); cmd.arg("metadata").arg("--no-deps"); if let Some(mani) = manifest_path_arg { cmd.arg(mani); } let output = cmd.output()?; let stdout = from_utf8(&output.stdout)?; Ok(json::decode(stdout)?) }