feat: look for jnml in standard places

Author: sanjayankur31

omv/engines/jneuroml.py

@@ -1,5 +1,8 @@
 import os
+import shutil
 import subprocess as sp
+from pathlib import Path
+import platform
 
 from omv.common.inout import inform, trim_path, is_verbose, check_output
 from omv.engines.engine import OMVEngine, EngineExecutionError
@@ -14,8 +17,19 @@ def get_environment():
 
         if 'JNML_HOME' in os.environ:
             jnmlhome = os.environ['JNML_HOME']
+        elif shutil.which("jnml") is not None:
+            jnmlhome = Path(shutil.which("jnml")).parent
         else:
-            jnmlhome = os.path.join(os.environ['HOME'],'jnml/jNeuroMLJar')
+            osname = platform.system()
+            if osname == "Linux":
+                try:
+                    jnmlhome = os.path.join(os.environ['XDG_DATA_HOME'],'jnml/jNeuroMLJar')
+                except KeyError as e:
+                    jnmlhome = os.path.join(os.environ['HOME'],'.local/share/jnml/jNeuroMLJar')
+            elif osname == "Darwin":
+                jnmlhome = os.path.join(os.environ['HOME'],'Library/jnml/jNeuroMLJar')
+            else:
+                jnmlhome = os.path.join(os.environ['HOME'],'jnml/jNeuroMLJar')
 
         environment_vars = {'JNML_HOME': jnmlhome}