[RFC WIP PATCH 0/3] tag: fix --edit and --no-edit flags

This series of patches fixes the flags --edit and --no-edit. Currently, --no-edit has no effect.

These patches implement the following behaviour:

- when --edit is provided, the editor will always be opened;

- when --no-edit is provided, the editor will not be opened (if possible),
  otherwise an error message will be displayed;

- when neither --edit nor --no-edit are provided, the editor is opened only if
  a message is not provided and there isn't a previous tag message.

In the future, the fix of these flags and the code factoring done in this patchset will be used on the implementation of a new flag --amend, as discussed on the mail thread started on https://public-inbox.org/git/CAHd499BM6M+=zRE1WFVXr7b+VhJHFeDind5xLqXcwZLv7QeDvw@mail.gmail.com/.

Lucas Oshiro (3):
  tag: factor out tag reading from write_tag_body()
  tag: factor out prepare tag template code
  tag: add full support for --edit and --no-edit

 builtin/tag.c  | 123 ++++++++++++++++++++++++++++++++++---------------
 t/t7004-tag.sh |   4 +-
 2 files changed, 88 insertions(+), 39 deletions(-)