Update tag help.

README.md

@@ -141,9 +141,10 @@ Please substitute `$version` with the appropriate package version.
 
     edit options:
       --url keyword        specify url, works with -u only
-      --tag [+] [...]      set comma-separated tags, works with -a, -u
+      --tag [+|-] [...]    set comma-separated tags, works with -a, -u
-                           clears tags, if no arguments
+                           clear tags, if no arguments
-                           appends tags, if preceded by '+'
+                           append specified tags, if preceded by '+'
+                           remove specified tags, if preceded by '-'
       -t, --title [...]    manually set title, works with -a, -u
                            if no arguments:
                            -a: do not set title, -u: clear title
@@ -308,9 +309,10 @@ The same number of iterations must be used for one lock & unlock instance. Defau
 21. **Delete tag** 'old tag' from DB:
 
         $ buku -r 'old tag'
-22. **Append tags** 'tag 1', 'tag 2' to existing tags of bookmark at index 15012014:
+22. **Append (or delete) tags** 'tag 1', 'tag 2' to (or from) existing tags of bookmark at index 15012014:
 
         $ buku -u 15012014 --tag + tag 1, tag 2
+        $ buku -u 15012014 --tag - tag 1, tag 2
 23. **Open URL** at index 15012014 in browser:
 
         $ buku -o 15012014

buku

@@ -552,7 +552,7 @@ class BukuDb:
             if meta == '':
                 print('\x1B[91mTitle: []\x1B[0m')
             logger.debug('Title: [%s]', meta)
-        elif not to_update and not append_tag and not delete_tag:
+        elif not to_update and not (append_tag or delete_tag):
             self.refreshdb(index)
             if index > 0:
                 self.print_bookmark(index)
@@ -1517,9 +1517,9 @@ if __name__ == '__main__':
         title='edit options',
         description='''--url keyword        specify url, works with -u only
 --tag [+|-] [...]    set comma-separated tags, works with -a, -u
-                     clears tags, if no arguments
+                     clear tags, if no arguments
-                     appends tags, if preceded by '+'
+                     append specified tags, if preceded by '+'
-                     or delete tags, if preceded by '-'
+                     remove specified tags, if preceded by '-'
 -t, --title [...]    manually set title, works with -a, -u
                      if no arguments:
                      -a: do not set title, -u: clear title

buku.1

@@ -67,7 +67,7 @@ Show program help and exit.
 Specify the URL, works with -u only. Fetches and updates title if --title is not used.
 .TP
 .BI \--tag " [+|-] [...]"
-Specify comma separated tags, works with -a, -u. Clears the tags, if no arguments passed. Appends tags, if list of tags is preceded by '+'.Delete tags, if list of tags is preceded by '-'.
+Specify comma separated tags, works with -a, -u. Clears the tags, if no arguments passed. Appends or deletes tags, if list of tags is preceded by '+' or '-' respectively.
 .TP
 .BI \-t " " \--title " [...]"
 Manually specify the title, works with -a, -u. Omits or clears the title, if no arguments passed.
@@ -351,11 +351,12 @@ The same number of iterations must be used for one lock & unlock instance. Defau
 .B buku -r 'old tag'
 .PP
 .IP 22. 4
-\fBAppend tags\fR 'tag 1', 'tag 2' to existing tags of bookmark at index 15012014:
+\fBAppend (or delete) tags\fR 'tag 1', 'tag 2' to (or from) existing tags of bookmark at index 15012014:
 .PP
 .EX
 .IP
 .B buku -u 15012014 --tag + tag 1, tag 2
+.B buku -u 15012014 --tag - tag 1, tag 2
 .PP
 .IP 23. 4
 \fBOpen URL\fR at index 15012014 in browser: