fix(remappings): project autoremappings should respect config (#9466)

crates/config/src/providers/remappings.rs

@@ -1,7 +1,4 @@
-use crate::{
-    foundry_toml_dirs, remappings_from_env_var, remappings_from_newline, utils::get_dir_remapping,
-    Config,
-};
+use crate::{foundry_toml_dirs, remappings_from_env_var, remappings_from_newline, Config};
 use figment::{
     value::{Dict, Map},
     Error, Figment, Metadata, Profile, Provider,
@@ -39,7 +36,12 @@ impl Remappings {
     pub fn with_figment(mut self, figment: &Figment) -> Self {
         let mut add_project_remapping = |path: &str| {
             if let Ok(path) = figment.find_value(path) {
-                if let Some(remapping) = path.into_string().and_then(get_dir_remapping) {
+                if let Some(path) = path.into_string() {
+                    let remapping = Remapping {
+                        context: None,
+                        name: format!("{path}/"),
+                        path: format!("{path}/"),
+                    };
                     self.project_paths.push(remapping);
                 }
             }

crates/forge/tests/cli/config.rs

@@ -856,3 +856,36 @@ contract MyScript is BaseScript {
     pretty_err(&lib_toml_file, fs::write(&lib_toml_file, lib_config.to_string_pretty().unwrap()));
     cmd.forge_fuse().args(["build"]).assert_success();
 });
+
+// Tests that project remappings use config paths.
+// For `src=src/contracts` config, remapping should be `src/contracts/ = src/contracts/`.
+// For `src=src` config, remapping should be `src/ = src/`.
+// <https://github.com/foundry-rs/foundry/issues/9454>
+forgetest!(test_project_remappings, |prj, cmd| {
+    foundry_test_utils::util::initialize(prj.root());
+    let config = Config {
+        src: "src/contracts".into(),
+        remappings: vec![Remapping::from_str("contracts/=src/contracts/").unwrap().into()],
+        ..Default::default()
+    };
+    prj.write_config(config);
+
+    // Add Counter.sol in `src/contracts` project dir.
+    let src_dir = &prj.root().join("src/contracts");
+    pretty_err(src_dir, fs::create_dir_all(src_dir));
+    pretty_err(
+        src_dir.join("Counter.sol"),
+        fs::write(src_dir.join("Counter.sol"), "contract Counter{}"),
+    );
+    prj.add_test(
+        "CounterTest.sol",
+        r#"
+import "contracts/Counter.sol";
+
+contract CounterTest {
+}
+   "#,
+    )
+    .unwrap();
+    cmd.forge_fuse().args(["build"]).assert_success();
+});