Re: [Patch v3 4/8] emacs: tag: add customize for deleted/added tag formats

[Austin Clements <amdragon@MIT.EDU>]

Quoth Mark Walters on Mar 12 at  4:09 am:
> Add customize options for deleted/added tag formats.  These are not
> used yet but will be later in the series.
> 
> We switch to using `notmuch-apply-face' rather than `propertize' in
> the defcustom for faces so that the faces for deleted/added tags add
> to the default face attributes for the tag.
> 
> We special case deleting the unread tag as that tag is a strong visual
> cue and we don't need that cue when we are just saying it used to be
> unread. Thus, we revert to the normal tag face with strikethough for
> deleted unread tags.
> ---
>  emacs/notmuch-tag.el |   37 ++++++++++++++++++++++++++++++++++++-
>  1 files changed, 36 insertions(+), 1 deletions(-)
> 
> diff --git a/emacs/notmuch-tag.el b/emacs/notmuch-tag.el
> index a4dea39..4698856 100644
> --- a/emacs/notmuch-tag.el
> +++ b/emacs/notmuch-tag.el
> @@ -39,7 +39,7 @@ (define-widget 'notmuch-tag-format-type 'lazy
>  			    (string :tag "Display as")
>  			    (list :tag "Face" :extra-offset -4
>  				  (const :format "" :inline t
> -					 (propertize tag 'face))
> +					 (notmuch-apply-face tag))
>  				  (list :format "%v"
>  					(const :format "" quote)
>  					custom-face-edit))
> @@ -89,6 +89,41 @@ (defcustom notmuch-tag-formats
>    :group 'notmuch-show
>    :type 'notmuch-tag-format-type)
>  
> +(defcustom notmuch-tag-deleted-formats
> +  '(("unread" (notmuch-apply-face "unread"
> +		      (if (display-supports-face-attributes-p '(:strike-through "red"))
> +			  '(:strike-through "red")
> +			'(:inverse-video t))))
> +    (".*" (notmuch-apply-face tag
> +		      (if (display-supports-face-attributes-p '(:strike-through "red"))
> +			  '(:strike-through "red")
> +			'(:inverse-video t)))))

Aren't the two formatters above the same thing?  Is this somehow
different from just having the .* formatter?  The indentation also
seems a little odd, though that may just be the diff.

> +  "Custom formats for tags when deleted.
> +
> +For deleted tags the formats in `notmuch-tag-formats` are applied
> +first and then these formats are applied on top.
> +
> +By default this shows deleted tags with strike-through in red,
> +unless strike-through is not available (e.g., emacs is running in
> +a terminal) in which case it uses inverse video. To hide deleted
> +tags completely set this to
> +  '((\".*\" nil))
> +
> +See `notmuch-tag-formats' for full documentation."
> +  :group 'notmuch-show
> +  :type 'notmuch-tag-format-type)
> +
> +(defcustom notmuch-tag-added-formats
> +  '((".*" (notmuch-apply-face tag '(:underline "green"))))
> +  "Custom formats for tags when added.
> +
> +For added tags the formats in `notmuch-tag-formats` are applied
> +first and then these formats are applied on top.

Maybe add

To disable special formatting of added tags, set this to ().

to parallel notmuch-tag-deleted-formats?

> +
> +See `notmuch-tag-formats' for full documentation."
> +  :group 'notmuch-show
> +  :type 'notmuch-tag-format-type)
> +
>  (defun notmuch-tag-format-image-data (tag data)
>    "Replace TAG with image DATA, if available.
>