on-save-file (augments, and augmentable only) in text:clever-file-format-mixin

Called just before the editor is saved to a file, after calling can-save-file? to verify that the save is allowed. See also after-save-file.

• (send a-text:clever-file-format-mixin on-save-file filename format void
     filename : path
     format : symbol in '(guess standard text text-force-cr same copy)

  If the method get-file-format returns 'standard and the text has only string-snip%s, the file format is set to 'text.

  If the method get-file-format returns 'text and the text has some non string-snip%s, the file format is set to 'standard.

  Depending on the user's preferences, the user may also be queried.

  Also, the changes to the file format only happen if the argument file-format is 'copy or 'same.