1 files changed, 105 insertions, 0 deletions
diff --git a/mling/src/project_solver.rs b/mling/src/project_solver.rs
new file mode 100644
index 0000000..381bba2
--- /dev/null
+++ b/mling/src/project_solver.rs
@@ -0,0 +1,105 @@
+use std::path::PathBuf;
+
+use serde::Serialize;
+
+pub type BinaryName = String;
+pub type BinaryTargetPath = PathBuf;
+
+pub struct ProjectSolveResult {
+    pub target_dir: PathBuf,
+    pub workspace_root: PathBuf,
+    pub binaries: Vec<BinaryItem>,
+}
+
+#[derive(Debug, Serialize)]
+pub struct BinaryItem {
+    pub name: String,
+    pub path: PathBuf,
+}
+
+pub fn solve_current_dir() -> Result<ProjectSolveResult, std::io::Error> {
+    let current = std::env::current_dir()?;
+    solve(current)
+}
+
+pub fn solve(current: PathBuf) -> Result<ProjectSolveResult, std::io::Error> {
+    let (target_dir, workspace_root, binaries) = solve_inner(&current)?;
+    Ok(ProjectSolveResult {
+        target_dir,
+        workspace_root,
+        binaries,
+    })
+}
+
+fn solve_inner(current: &PathBuf) -> Result<(PathBuf, PathBuf, Vec<BinaryItem>), std::io::Error> {
+    let output = std::process::Command::new("cargo")
+        .arg("metadata")
+        .arg("--format-version")
+        .arg("1")
+        .current_dir(current)
+        .output()?;
+    if !output.status.success() {
+        let stderr = String::from_utf8_lossy(&output.stderr);
+        return Err(std::io::Error::new(
+            std::io::ErrorKind::Other,
+            format!("cargo metadata failed: {}", stderr),
+        ));
+    }
+    let metadata: serde_json::Value = serde_json::from_slice(&output.stdout)
+        .map_err(|e| std::io::Error::new(std::io::ErrorKind::InvalidData, e))?;
+
+    let workspace_root_str = metadata["workspace_root"].as_str().ok_or_else(|| {
+        std::io::Error::new(std::io::ErrorKind::InvalidData, "missing workspace_root")
+    })?;
+    let workspace_root = PathBuf::from(workspace_root_str);
+
+    let target_dir_str = metadata["target_directory"].as_str().ok_or_else(|| {
+        std::io::Error::new(std::io::ErrorKind::InvalidData, "missing target_directory")
+    })?;
+    let target_dir = PathBuf::from(target_dir_str);
+
+    let packages = metadata["packages"].as_array().ok_or_else(|| {
+        std::io::Error::new(std::io::ErrorKind::InvalidData, "missing packages array")
+    })?;
+
+    let mut binaries = Vec::new();
+    let cargo_toml_path = workspace_root.join("Cargo.toml");
+
+    // Find the package whose manifest_path matches workspace_root/Cargo.toml
+    for pkg in packages {
+        let manifest_path = pkg["manifest_path"].as_str().ok_or_else(|| {
+            std::io::Error::new(std::io::ErrorKind::InvalidData, "missing manifest_path")
+        })?;
+        let manifest_path_buf = PathBuf::from(manifest_path);
+        if manifest_path_buf == cargo_toml_path {
+            // Found the workspace root package
+            if let Some(targets) = pkg["targets"].as_array() {
+                for target in targets {
+                    let kind = target["kind"].as_array();
+                    let is_bin = kind
+                        .map(|k| k.iter().any(|v| v.as_str() == Some("bin")))
+                        .unwrap_or(false);
+                    if is_bin {
+                        let name = target["name"].as_str().ok_or_else(|| {
+                            std::io::Error::new(
+                                std::io::ErrorKind::InvalidData,
+                                "missing target name",
+                            )
+                        })?;
+                        let mut binary_path = target_dir.join("release").join(name);
+                        if cfg!(target_os = "windows") {
+                            binary_path.set_extension("exe");
+                        }
+                        binaries.push(BinaryItem {
+                            name: name.to_string(),
+                            path: binary_path,
+                        });
+                    }
+                }
+            }
+            break;
+        }
+    }
+
+    Ok((target_dir, workspace_root, binaries))
+}