Add example and fix preserving title

README.md

@@ -195,6 +195,7 @@ EDIT OPTIONS:
                            clears description, if no arguments
       --immutable N        disable web-fetch during auto-refresh
                            N=0: mutable (default), N=1: immutable
+      --preserve [...]     values to preserve for -u
 
 SEARCH OPTIONS:
       -s, --sany [...]     find records with ANY matching keyword
@@ -453,10 +454,13 @@ PROMPT KEYS:
         buku (? for help) g > 5 3-2
         // remove tags at taglist indices 4 and 6-9 from tags in bookmarks at indices 5 and 2-3
         buku (? for help) g 4 9-6 << 5 3-2
-37. List bookmarks with **colored output**:
+37. **Update** URL but **Preserve** title 
+
+        $ buku -u 479 --preserve title --url https://example.com
+38. List bookmarks with **colored output**:
 
         $ buku --colors oKlxm -p
-38. More **help**:
+39. More **help**:
 
         $ buku -h
         $ man buku

buku

@@ -795,6 +795,7 @@ class BukuDb:
         tag_modified = False
         ret = False
 
+        preserve_title = False
         if preserve is not None:
             for option in preserve:
                 if option == "url":
@@ -805,6 +806,7 @@ class BukuDb:
                     desc = None
                 elif option == "title":
                     title_in = None
+                    preserve_title = True
 
         # Update URL if passed as argument
         if url is not None and url != '':
@@ -871,7 +873,7 @@ class BukuDb:
         ptags = None
         if title_in is not None:
             title_to_insert = title_in
-        elif url is not None and url != '':
+        elif url is not None and url != '' and not preserve_title:
             title_to_insert, pdesc, ptags, mime, bad = network_handler(url)
             if bad:
                 print('Malformed URL')