Re: Detecting the coding system of a file programmatically

[Andrea Cardaci]

Hi Eli,

Thanks for the thorough reply.

> That's the wrong function to use in this case; you want
> decode-coding-inserted-region instead.

Yes, that works!

> Thus, I expect this to work for you:
>
>   (with-temp-buffer
>     (insert-file-contents-literally path)
>     (decode-coding-region (point-min) (point-max)
>                           (find-operation-coding-system
>                             'insert-file-contents
>                             (cons path (current-buffer)))))

Yes, except that it accepts a single symbol. I also tried directly with:

(decode-coding-region (point-min) (point-max) 'undecided)

which in my use case it resulted in a more snappy performance.
Basically this latter `decode-coding-region' doesn't introduce a
noticeable slowing to the `insert-file-contents-literally', instead
using `decode-coding-inserted-region' is more or less as slow as using
`insert-file-contents' alone. I guess I'll go with the former.


Andrea