begun to do fields, blue

core/views/cave_kataster.py

@@ -1,3 +1,4 @@
+import re
 from pathlib import Path
 
 import django.forms as forms
@@ -23,6 +24,38 @@ is 'katastered', ie.e moves from an informal number, such as
 """
 
 def kataster(request, slug):
+    """Create the page which analyses how to rename a cave and all the files from the unofficial_number
+    identifier, e.g. 1623-2023-mg-03 to the kataster number e.g. 1623-999
+    """
+    def do_file_finding():
+        
+        global cavefilename, cave_data, entrance_data, loser_name, loser_data
+        
+        cavefilename = str(cave) + ".html"
+        
+        cave_data = Path( "cave_data", cavefilename  )
+        if not (settings.CAVEDESCRIPTIONS / cavefilename).is_file: # settings.EXPOWEB / cave_data
+            cave_data = "does not exist"
+
+        ent_dir = settings.ENTRANCEDESCRIPTIONS # settings.EXPOWEB / "entrance_data"
+
+        entrance_data = []
+        for ent in ent_dir.iterdir():
+            if str(ent.name).startswith(str(cave)):
+                print(ent.name)
+                entrance_data.append("entrance_data/"+ent.name)    
+
+        loser_name = f"caves-{str(cave.areacode)}/{str(cave.unofficial_number)}"
+        loser_dir = settings.SURVEX_DATA / loser_name
+        loser_data = []
+        if (loser_dir).is_dir():
+            print(loser_dir)
+            for svx in loser_dir.iterdir():
+                print(svx)
+                loser_data.append(Path(loser_dir , svx).name)    
+                
+
+
     if cave := get_cave_from_slug(slug.lower()):
         pass
     elif cave := get_cave_from_slug(slug.upper()):
@@ -31,29 +64,25 @@ def kataster(request, slug):
         return HttpResponseRedirect("/caves")   
 
     knum = 9999
-    filename = str(cave) + ".html"
-    
-    cave_data = Path( "cave_data", filename  )
-    if not (settings.EXPOWEB / cave_data).is_file:
-        cave_data = "does not exist"
+    do_file_finding()
 
-    ent_dir = settings.EXPOWEB / "entrance_data"
+    try:
+        # this is a python generator idiom.
+        # see https://realpython.com/introduction-to-python-generators/
+        with open(settings.CAVEDESCRIPTIONS / cavefilename, 'r') as f:
+            for line in f: 
+                if match := re.search(r'<entranceslug>(.*?)</entranceslug>', line):
+                    entrance = match.group(1)
+                    print(entrance)
+               
+    except PermissionError as e:
+        msg=f"CANNOT  save this file.\nPERMISSIONS incorrectly set on server for this file {filepath}. Ask a nerd to fix this: {e}"
+        print(msg)
+        raise
+    except Exception as e:
+        msg=f"CANNOT  write this file {filepath}. Ask a nerd to fix this: {e}"
+        print(msg)
 
-    entrance_data = []
-    for ent in ent_dir.iterdir():
-        if str(ent.name).startswith(str(cave)):
-            print(ent.name)
-            entrance_data.append("entrance_data/"+ent.name)    
-
-    loser_name = f"caves-{str(cave.areacode)}/{str(cave.unofficial_number)}"
-    loser_dir = settings.SURVEX_DATA / loser_name
-    loser_data = []
-    if (loser_dir).is_dir():
-        print(loser_dir)
-        for svx in loser_dir.iterdir():
-            print(svx)
-            loser_data.append(Path(loser_dir , svx).name)    
-                
     if request.method == "POST":  # If the form has been submitted...
         form = KatasterForm(request.POST)  # A form bound to the POST data
         if form.is_valid():