fix(remappings): explicit lib remappings should override detected

crates/config/src/providers/remappings.rs

@@ -157,10 +157,6 @@ impl RemappingsProvider<'_> {
         // resolve that
         if self.auto_detect_remappings {
             let mut lib_remappings = BTreeMap::new();
-            // find all remappings of from libs that use a foundry.toml
-            for r in self.lib_foundry_toml_remappings() {
-                insert_closest(&mut lib_remappings, r.context, r.name, r.path.into());
-            }
             // use auto detection for all libs
             for r in self
                 .lib_paths
@@ -177,6 +173,12 @@ impl RemappingsProvider<'_> {
                 insert_closest(&mut lib_remappings, r.context, r.name, r.path.into());
             }
 
+            // Find all remappings from libs that use a foundry.toml
+            // Explicit remappings should override auto-detected remappings.
+            for r in self.lib_foundry_toml_remappings() {
+                lib_remappings.entry(r.context).or_default().insert(r.name, r.path.into());
+            }
+
             all_remappings.extend(
                 lib_remappings
                     .into_iter()

crates/forge/tests/cli/config.rs

@@ -573,26 +573,32 @@ forgetest_init!(can_detect_lib_foundry_toml, |prj, cmd| {
 
 // test remappings with closer paths are prioritised
 // so that `dep/=lib/a/src` will take precedent over  `dep/=lib/a/lib/b/src`
-forgetest_init!(can_prioritise_closer_lib_remappings, |prj, cmd| {
-    let config = cmd.config();
-
-    // create a new lib directly in the `lib` folder with conflicting remapping `forge-std/`
-    let mut config = config;
-    config.remappings = vec![Remapping::from_str("forge-std/=lib/forge-std/src/").unwrap().into()];
+forgetest!(can_prioritise_closer_lib_remappings, |prj, cmd| {
+    // `lib/dep1` has `my-dep/=path/to/dep` remappings.
+    // `lib/dep1/lib/dep2` has `my-dep/=path/to/dep` and `my-dep2/=path/to/dep` remappings.
+    // Resolved remappings should be `my-dep` to `lib/dep1` and `my-dep2` to `lib/dep1/lib/dep2`.
+    let mut config = cmd.config();
+    config.remappings.push(Remapping::from_str("my-dep/=path/to/dep").unwrap().into());
     let nested = prj.paths().libraries[0].join("dep1");
     pretty_err(&nested, fs::create_dir_all(&nested));
     let toml_file = nested.join("foundry.toml");
     pretty_err(&toml_file, fs::write(&toml_file, config.to_string_pretty().unwrap()));
 
-    let config = cmd.config();
-    let remappings = config.get_all_remappings().collect::<Vec<_>>();
-    similar_asserts::assert_eq!(
-        remappings,
-        vec![
-            "dep1/=lib/dep1/src/".parse().unwrap(),
-            "forge-std/=lib/forge-std/src/".parse().unwrap()
-        ]
-    );
+    let nested_lib = prj.paths().libraries[0].join("dep1").join("lib/dep2");
+    pretty_err(&nested, fs::create_dir_all(&nested_lib));
+    let toml_file = nested_lib.join("foundry.toml");
+    config.remappings.push(Remapping::from_str("my-dep2/=path/to/dep").unwrap().into());
+    pretty_err(&toml_file, fs::write(&toml_file, config.to_string_pretty().unwrap()));
+
+    cmd.args(["remappings", "--pretty"]).assert_success().stdout_eq(str![[r#"
+Global:
+- dep1/=lib/dep1/src/
+- dep2/=lib/dep1/lib/dep2/src/
+- my-dep/=lib/dep1/path/to/dep/
+- my-dep2/=lib/dep1/lib/dep2/path/to/dep/
+
+
+"#]]);
 });
 
 // Test that remappings within root of the project have priority over remappings of sub-projects.