Move path search into tools.py

1 files changed, 37 insertions, 0 deletions

diff --git a/wqflask/utility/tools.py b/wqflask/utility/tools.py
new file mode 100644
index 00000000..3c972557
--- /dev/null
+++ b/wqflask/utility/tools.py
@@ -0,0 +1,37 @@
+# Tools/paths finder resolves external paths from settings and/or environment
+# variables
+#
+# Currently supported:
+#
+#   PYLMM_PATH finds the root of the git repository of the pylmm_gn2 tool 
+
+import os
+
+def get_setting():
+    """
+    Resolve a setting from the environment or the global settings in app.config
+    """
+    pass
+    
+def pylmm_command(default=None):
+    def get_valid_path(path):
+        if path and os.path.isfile(path+'/lmm.py'):
+            return path
+        else:
+            None
+
+    # ---- Check whether environment exists
+    path = get_valid_path(os.environ['PYLMM_PATH'])
+    # ---- Check whether setting exists
+    if not path:
+        path = get_valid_path(app.config.get('PYLMM_PATH'))
+    # ---- Check whether default exists
+    if not path:
+        path = get_valid_path(default)
+    home = get_valid_path(os.environ['HOME']+'/pylmm_gn2')
+    if not path:
+        path = get_valid_path(home)
+    if not path:
+        raise Exception('PYLMM_PATH '+home+' unknown or faulty (add PYLMM_PATH to settings.py)')
+    pylmm_command = 'python '+path+'/lmm.py'
+    return path,pylmm_command