Re: auto-detect multiple languages -- ispell-detect.el

[Emanuel Berg <incal@dataswamp.org>]

Gregor Zattler wrote:

> I don't use [guess-language] it, because I did not manage to
> configure it to integrate wcheck-mode.

Now you got me motivated ...

What is the optimal solution to this problem?

1. Detection

- is done _once_ for the entire material

- processes _everything_, so does not rely on incomplete and
  error-prone polling/probing

2. Spelling

- is done _once_ for each detected language

- works for all Emacs spellcheckers

So for (1), we need a detect-languages to return a list like
this - if we for example envision a buffer with mixed English,
Latvian, and Swedish:

(("en" ((en-1-beg en-1-end) ... (en-n-beg en-n-end)))
 ("lv" ((lv-1-beg lv-1-end) ... (lv-m-beg lv-m-end)))
 ("sv" ((sv-1-beg sv-1-end) ... (sv-o-beg sv-o-end)))) ; [*]

For (2) we need the equivalence of not `narrow-to-region' but
narrow-to-regions (or virtual-buffer-from-regions or
something).

Then it is a matter of:

(cl-loop for (lang regs) in (detect-languages) do
  (narrow-to-regions regs)
  (funcall #'spellchecker-change-dictionary lang)
  (funcall #'spellchecker-spell))

Tada, works for everything! \o/

So do we have detect-languages (maybe that is in
`guess-language'?) and narrow-to-regions?

[*] Language codes from ISO 639 set 1,
    https://en.wikipedia.org/wiki/List_of_ISO_639_language_codes

-- 
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