There is another user option `compress-file-default-suffix` that allow user custom default suffix for compressing file in dired-mode.

These two patch allow user custom suffix for compressing folder and file in dired-mode by pressing "Z".

Both two patches are attached.     On Tuesday, March 23, 2021, 11:16:13 PM GMT+8, Lin Sun <lin.sun@zoom.us> wrote:  
 
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Hi Eli,

  

Sorry for my misunderstanding for your preview comments.

  

> but wouldn't it be better to use symbols instead of strings?

The new option `dired-compress-files-default-suffix` can be “.tar.gz” or “.tar.xz”… and it should work with variable ` dired-compress-file-suffixes` while this variable maybe extended by user. So the type:string is simple for implementation.

  

And yes, the document need update, changes are available in the attachment.

  

Please help to review the new patch. Thanks.