Merge #254

254:  Search for Xargo.toml in parent directories, including test r=RalfJung a=Nils-TUD

So far, xargo expected the Xargo.toml in the directory of the Cargo.toml. This patch searches for the Xargo.toml by walking up the directory hierarchy. This is useful if a workspace is used, leading, for example, to one Cargo.toml with the workspace and multiple Cargo.toml files for the members of the workspace. With this patch, it is no longer necessary to have one Xargo.toml for each Cargo.toml, but only one next to the workspace, for example.

Co-authored-by: Nils Asmussen <[email protected]>

src/xargo.rs

@@ -121,11 +121,10 @@ impl Toml {
 }
 
 pub fn toml(root: &Root) -> Result<Option<Toml>> {
-    let p = root.path().join("Xargo.toml");
-
-    if p.exists() {
-        util::parse(&p).map(|t| Some(Toml { table: t }))
-    } else {
+    if let Some(p) = util::search(root.path(), "Xargo.toml") {
+        util::parse(&p.join("Xargo.toml")).map(|t| Some(Toml { table: t }))
+    }
+    else {
         Ok(None)
     }
 }

tests/smoke.rs

@@ -171,7 +171,13 @@ struct Project {
 }
 
 impl Project {
+    /// Creates a new project with given name in a temporary directory.
     fn new(name: &'static str) -> Result<Self> {
+        Self::new_in(std::env::temp_dir(), name)
+    }
+
+    /// Creates a new project with given name in a sub directory of `dir`.
+    fn new_in(dir: PathBuf, name: &'static str) -> Result<Self> {
         const JSON: &'static str = r#"
 {
     "arch": "arm",
@@ -186,7 +192,7 @@ impl Project {
 }
 "#;
 
-        let td = TempDir::new("xargo").chain_err(|| "couldn't create a temporary directory")?;
+        let td = TempDir::new_in(dir, "xargo").chain_err(|| "couldn't create a temporary directory")?;
 
         xargo()?
             .args(&["init", "-q", "--lib", "--vcs", "none", "--name", name])
@@ -350,16 +356,17 @@ fn simple() {
 }
 
 /// Test building a dependency specified as `target.{}.dependencies` in
-/// Xargo.toml
+/// ../Xargo.toml
 #[cfg(feature = "dev")]
 #[test]
 fn target_dependencies() {
     fn run() -> Result<()> {
         // need this exact target name to get the right gcc flags
         const TARGET: &'static str = "thumbv7m-none-eabi";
 
-        let project = Project::new(TARGET)?;
-        project.xargo_toml(
+        let td = TempDir::new("xargo").chain_err(|| "couldn't create a temporary directory")?;
+        let project = Project::new_in(td.path().to_path_buf(), TARGET)?;
+        write(&td.path().join("Xargo.toml"), false,
             r#"
 [target.thumbv7m-none-eabi.dependencies.alloc]
 "#,