bug#66470: 29.1; Provide Urdu input method

[Eli Zaretskii <eliz@gnu.org>]

> From: Rahguzar <rahguzar@zohomail.eu>
> Cc: 66470@debbugs.gnu.org
> Date: Sat, 21 Oct 2023 20:59:10 +0200
> 
> I have attached a new patch with this email containing 5 input methods.
> 3 of them for Urdu and 1 each for Pashto and Sindhi. Two of Urdu input
> methods correspond to the two keyboards at https://www.branah.com/urdu
> and the Pashto and Sindhi input methods follow keyboard layouts from the
> same page.

Thanks.  This lacks a ChangeLog-style commit log message (see
CONTRIBUTE and "git log" for how we write those).

> +;; Layout taken from https://www.branah.com/urdu
> +(quail-define-package
> + "urdu-keyboard" "Urdu" "اردو تختی" t
                            ^^^^^^^^
Can you come up with a shorter mode-line indicator for this and other
input methods?  We usually use just 1 or 2 letters for it; you used
something much longer.

> +(defun pakistan--define-quail-rules (rules &optional prefix package)
> +  "Define the rules for an input method.

Our style is to have the first sentence of a doc string be a summary
of what the function does and also mention all the mandatory
arguments.  I would suggest something like

  Define rules for a Pakistan input method as determined by RULES.

> +(defun pakistan--make-setter (&optional prefix package)
> +  "Retrun the setter function.
      ^^^^^^
Typo.

> +The function add rules to PACKAGE with PREFIX."
                ^^^
"adds".

> +(defun pakistan--set-numeral-translations (var val)
> +  "Add translations for digits.

This should mention the arguments.

> +(quail-define-package
> + "urdu-custom" "Urdu" "اردو انفر۱دی" t
> + "Intuitive and customizable transl input method for Urdu.
> +By default this input method doesn't try to follow the common romanization of Urdu
> +very closely.  The reason for this is allow to for input efficiency. It works as
> +follows:

Please try not to use lines longer than 79 characters in doc strings.

Thanks.