When users don't fill the title field when posting a comment, or when this field is disabled, Drupal word-safely cuts a 29 characters extract from the beginning of the comment's body to generate a title.
With this module, it is possible to choose the comment automatic title length, from 1 to 64 characters.
Comment automatic title adds another feature: it can cut this extract at the first character found, from a list you provide (full-stop, comma, etc.).

For example, let's consider this comment:

Lorem ipsum dolor sit amet, consectetur adipiscing elit. In augue purus, pellentesque ut, suscipit nec, scelerisque commodo, leo.

By default, Drupal will generate this title: Lorem ipsum dolor sit amet,.
With comment_auto_title, there are many possibilities, depending on the settings.

Length: 60, cut characters: [empty] => Lorem ipsum dolor sit amet, consectetur adipiscing elit. In
Length: 60, cut characters; . (full-stop) => Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Length: 25, cut characters: . (full-stop) => Lorem ipsum dolor sit
Length: 60, cut characters: .,?! (full-stop, comma, question mark, exclamation mark) => Lorem ipsum dolor sit amet,

This module works whether the comment title field is enabled or not.

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