loading cave aliases from file now working

1 files changed, 49 insertions, 0 deletions

diff --git a/core/utils.py b/core/utils.py
index 6670a65..40483e3 100644
--- a/core/utils.py
+++ b/core/utils.py
@@ -2,6 +2,7 @@ import hashlib
 import logging
 import math
 import os
+import re
 import random
 import resource
 import string
@@ -43,6 +44,8 @@ sha = hashlib.new('sha256')
 
 throw = 35.0
 
+
+
 # This is module-level executable. This is a Bad Thing. Especially when it touches the file system.
 try:
     logging.basicConfig(level=logging.DEBUG, filename=settings.LOGFILE, filemode="w")
@@ -131,6 +134,52 @@ def current_expo():
     else:
         return settings.EPOCH.year # this is 1970
 
+def parse_aliases(aliasfile):
+    """Reads a long text string containing pairs of strings: 
+        (alias, target)
+     where the alias is an old name for a cave and the target is the current, valid name for the cave, e.g.
+     ("2015-mf-06", "1623-288"),
+     returns a list of tuple pairs
+     
+     May fail if there is more than one space after the comma separating strings
+     """
+
+    report = [] # Messages about failed lines
+    aliases = []
+    
+    filepath = Path(settings.EXPOWEB) / "cave_data" / aliasfile
+    if not filepath.is_file():
+        message = f' ** {filepath} is not a file.'
+        print(message)
+        return [(None, None)]
+    try:
+        with open(filepath, "r") as aliasfile:
+            for line in aliasfile:
+                l, sep, tail = line.partition('#')
+                l, sep, tail = l.partition(';')
+                l = l.strip().strip(',') # remove terminal comma if present
+                l = l.strip().strip('()')
+                l = l.replace("\"","")
+                l = l.replace("\'","")
+                l = l.replace(" ","") # removes all spaces
+                l = " ".join(l.split(',')) # subtle, splits on comma, joins with one space
+                if len(l) == 0:
+                    # print(f"no parseable content: {line}")
+                    continue
+                key, sep, target = l.partition(' ')
+                if len(key) == 0 or len(target) == 0:
+                    message = f' ** Parsing failure for {line}'
+                    print(message)
+                    continue
+                
+                print(f"{key} => {target}")
+                aliases.append((key,target))
+    except:
+        message = f' ** Cannot open {filepath} for text file reading even though it is a file.'
+        print(message)
+        return [(None, None)], "Fail on file reading"
+    return aliases, report
+
 def only_commit(fname, message):
     """Only used to commit a survex file edited and saved in view/survex.py"""
     git = settings.GIT