change fprettify path if invoked from spack (#184)

* change fprettify path if invoked from spack

* convert to str

* add comment

pyutils/src/icon4py/icon4pygen/bindings/utils.py

@@ -38,9 +38,17 @@ def calc_num_neighbors(dim_list: list[Dimension], includes_center: bool) -> int:
 
 
 def format_fortran_code(source: str) -> str:
-    """Format fortran code using fprettify."""
+    """Format fortran code using fprettify.
+
+    The path to fprettify needs to be set explicitly for the
+    non-Spack build process as Liskov does not activate a virtual environment.
+    However, the PYTHON_PATH does not contain fprettify in a Spack build, hence the need for a special condition
+    """
     bin_path = Path(PYTHON_PATH).parent
-    fprettify_path = bin_path / "fprettify"
+    if "spack" not in str(bin_path):
+        fprettify_path = bin_path / "fprettify"
+    else:
+        fprettify_path = "fprettify"
     args = [str(fprettify_path)]
     p1 = subprocess.Popen(args, stdout=subprocess.PIPE, stdin=subprocess.PIPE)
     return p1.communicate(source.encode("UTF-8"))[0].decode("UTF-8").rstrip()