content-subject
...............

content-subject is a part to display abstract for the content. It is placed in top of content.

In default, it is displayed following design:

             [1.3 test (text/plain)]

First number field represents position of a content in the message. It is called `content-number'. It can be considered as the chapter number in the message.

Second string part represents title. It is created by following:

  * name paramater or x-name parameter in Content-Type field

  * Content-Description field or Subject field

  * filename of uuencode

If they are not exists, space is displayed.

Third parenthesis part represents content-type/subtype of the content. If it is non-MIME part, nil is displayed.

Content-subject is used like icon when content-header and content-body are hidden. For example,

             [2  (image/gif)]

if you press `v' key, GIF image is displayed.

Variable mime-viewer/content-subject-omitting-Content-Type-list

List of content-type. If content-type of a content is a member of this list, its content-subject is not displayed.

This variable is referenced by function mime-viewer/default-content-subject-function.

Function mime-viewer/default-content-subject-function rcnum cinfo ctype params subj

Default value of the variable mime-viewer/content-subject-function.  It refers variable mime-viewer/content-subject-omitting-Content-Type-list.

 -- Variable: mime-viewer/content-subject-function rcnum cinfo ctype params subj

     Variable to specify content-subject display function. Default value is the function mime-viewer/default-content-subject-function.