Configurable search paths (#5356)

crates/goose/src/config/base.rs

@@ -136,6 +136,16 @@ impl Default for Config {
     }
 }
 
+macro_rules! declare_param {
+    ($param_name:ident, $param_type:ty) => {
+        paste::paste! {
+            pub fn [<get_ $param_name:lower>](&self) -> Result<$param_type, ConfigError> {
+                self.get_param(stringify!($param_name))
+            }
+        }
+    };
+}
+
 impl Config {
     /// Get the global configuration instance.
     ///
@@ -730,6 +740,8 @@ impl Config {
         };
         Ok(())
     }
+
+    declare_param!(GOOSE_SEARCH_PATHS, Vec<String>);
 }
 
 /// Load init-config.yaml from workspace root if it exists.

crates/goose/src/config/mod.rs

@@ -4,6 +4,7 @@ mod experiments;
 pub mod extensions;
 pub mod paths;
 pub mod permission;
+pub mod search_path;
 pub mod signup_openrouter;
 pub mod signup_tetrate;
 

crates/goose/src/config/search_path.rs

@@ -0,0 +1,25 @@
+use std::{env, ffi::OsString, path::PathBuf};
+
+use crate::config::{Config, ConfigError};
+
+pub fn search_path_var() -> Result<OsString, ConfigError> {
+    let paths = Config::global()
+        .get_goose_search_paths()
+        .or_else(|err| match err {
+            ConfigError::NotFound(_) => Ok(vec![]),
+            err => Err(err),
+        })?
+        .into_iter()
+        .map(|s| PathBuf::from(shellexpand::tilde(&s).as_ref()));
+
+    env::join_paths(
+        paths.chain(
+            env::var_os("PATH")
+                .as_ref()
+                .map(env::split_paths)
+                .into_iter()
+                .flatten(),
+        ),
+    )
+    .map_err(|e| ConfigError::DeserializeError(format!("{}", e)))
+}