Re: How do you write input methods?

[Filipp Gunbin <fgunbin@fastmail.fm>]

On 02/09/2021 09:23 +0300, Eli Zaretskii wrote:

>> From: Filipp Gunbin <fgunbin@fastmail.fm>
>> Cc: andremegafone@gmail.com,  perry@piermont.com,  emacs-devel@gnu.org
>> Date: Wed, 01 Sep 2021 23:33:51 +0300
>>
>> > Out of curiosity: why do you need something like that? what's the use
>> > case?
>>
>> It's because our LDAP server at work is a bit messy, attributes like
>> "cn" and "displayname" sometimes contain first then last name, sometimes
>> vice versa, sometimes in Russian, sometimes in English.  I use email
>> expansion in message-mode:
>>
>> --8<---------------cut here---------------start------------->8---
>> (eval-after-load 'message
>>   (lambda ()
>>     (define-key message-mode-map (kbd "C-c TAB") #'eudc-expand-inline)))
>> --8<---------------cut here---------------end--------------->8---
>>
>> I want to type first letters of surname in English, press C-c TAB and
>> get email autocompleted.  But the only "stable", predictable attribute
>> seems to be "sn", which is unfortunately in Russian.  So I do:
>>
>> --8<---------------cut here---------------start------------->8---
>> (eudc-protocol-set 'eudc-inline-query-format '((sn) (email)) 'ldap)
>> (advice-add #'eudc-ldap-simple-query-internal
>>             :filter-args #'fg-dotemacs-ldap-advice)
>>
>> (defun fg-dotemacs-ldap-advice (args)
>>   (cons (mapcar (lambda (attr)
>>                   (if (and (eq (car attr) 'sn)
>>                            (stringp (cdr attr))
>>                            (seq-every-p (lambda (c)
>>                                           (eq (aref char-script-table c) 'latin))
>>                                         (cdr attr)))
>>                       (cons (car attr)
>>                             (fg-dotemacs-translit (cdr attr) "cyrillic-translit"))
>>                     attr))
>>                 (car args))
>>         (cdr args)))
>> --8<---------------cut here---------------end--------------->8---
>>
>> As ugly as it is, but it works.
>
> So what you need is to apply the cyrillic-translit input method, just
> not in an interactive context, is that true?

Yes, right.