feat: add python sys.path to vyper path

vyper/cli/vyper_compile.py

@@ -238,10 +238,16 @@ def compile_files(
     storage_layout_paths: list[str] = None,
     no_bytecode_metadata: bool = False,
 ) -> dict:
-    paths = paths or []
+    # lowest precedence search path is always sys path
+    search_paths = [Path(p) for p in sys.path]
+
+    # python sys path uses opposite resolution order from us
+    # (first in list is highest precedence; we give highest precedence
+    # to the last in the list)
+    search_paths.reverse()
 
-    # lowest precedence search path is always `.`
-    search_paths = [Path(".")]
+
+    paths = paths or []
 
     for p in paths:
         path = Path(p).resolve(strict=True)

vyper/semantics/analysis/module.py

@@ -482,10 +482,17 @@
 
 
 def _parse_and_fold_ast(file: FileInput) -> vy_ast.VyperNode:
+    module_path = file.resolved_path  # for error messages
+    try:
+        # try to get a relative path, to simplify the error message
+        module_path = module_path.relative_to(".")
+    except ValueError:
+        pass
+
     ret = vy_ast.parse_to_ast(
         file.source_code,
         source_id=file.source_id,
-        module_path=str(file.path),
+        module_path=str(module_path),
         resolved_path=str(file.resolved_path),
     )
     return ret