Use index to construct timeline

posts.py

@@ -2029,6 +2029,22 @@ def createBoxBase(session,baseDir: str,boxname: str, \
 
     # post filenames sorted in descending order
     postsInBoxDict={}
+
+    indexFilename=baseDir+'/accounts/'+nickname+'@'+domain+'/'+boxname+'.index'
+    if os.path.isfile(indexFilename):
+        print('DEBUG: using index file to construct timeline')
+        postsCtr=0
+        maxPostCtr=None
+        if pageNumber:
+            maxPostCtr=itemsPerPage*pageNumber
+        with open(indexFilename, 'r') as indexFile:
+            for postFilename in indexFile:
+                postsInBoxDict[postsCtr]=os.path.join(boxDir, postFilename)
+                postsCtr+=1
+                if maxPostCtr:
+                    if postsCtr>=maxPostCtr:
+                        break
+    else:
         postsCtr=createBoxIndex(boxDir,postsInBoxDict)
 
         # combine the inbox for the account with the shared inbox