Support passing --config option directly to cargo

Changelog.md

@@ -1,5 +1,9 @@
 # Change Log
 
+## [0.2.39] - 2024-09-19
+- support --config KEY=VAL option that is passed directly to cargo
+- bump deps
+
 ## [0.2.38] - 2024-07-02
 - slightly smarter artifact detection, shouldn't panic with wasm crates
 - bump deps

README.md

@@ -71,6 +71,8 @@ Show the code rustc generates for any function
 **Cargo options**
 - **`    --manifest-path`**=_`PATH`_ — 
   Path to Cargo.toml, defaults to one in current folder
+- **`    --config`**=_`<KEY=VALUE>`_ &mdash; 
+  Override a cargo configuration value
 - **`    --target-dir`**=_`DIR`_ &mdash; 
   Use custom target directory for generated artifacts, create if missing
 

src/main.rs

@@ -70,6 +70,7 @@ fn spawn_cargo(
         .args(["--package", &focus_package.name])
         .args(focus_artifact.as_cargo_args())
         // Compile options.
+        .args(cargo.config.iter().flat_map(|c| ["--config", c]))
         .args(cargo.dry.then_some("--dry"))
         .args(cargo.frozen.then_some("--frozen"))
         .args(cargo.locked.then_some("--locked"))

src/opts.rs

@@ -90,6 +90,10 @@ pub struct Cargo {
     #[bpaf(external, hide_usage)]
     pub manifest_path: PathBuf,
 
+    /// Override a cargo configuration value
+    #[bpaf(argument("KEY=VALUE"))]
+    pub config: Vec<String>,
+
     /// Use custom target directory for generated artifacts, create if missing
     #[bpaf(
         env("CARGO_TARGET_DIR"),