bug#29759: 25.2; "exciting footnote styles" promised, but unavailable

[Boruch Baum <boruch_baum@gmx.com>]

The docstring for variable `footnote-style-alist' promises, "See
footnote-han.el, footnote-greek.el and footnote-hebrew.el for more
exciting styles"; However, those files neither seem to be installed with
emacs, nor appear when I perform a google search for them.

Attached is a patch for Hebrew footnotes, for the benefit of all who
might be 'excited' by such things. For the rest of us, please consider
providing / restoring those files to emacs, or consider applying this
code.


(defconst footnote-hebrew-regex "[אבגדהוזחטיכלמנסעפצקרשת]+")
(defconst footnote-hebrew '(
  ("א" "ב" "ג" "ד" "ה" "ו" "ז" "ח" "ט")
  ("י" "כ" "ל" "מ" "נ" "ס" "ע" "פ" "צ")
  ("ק" "ר" "ש" "ת" "תק" "תר"" תש" "תת" "תתק")))
(defun Footnote-hebrew(n)
  "Supports 9999 footnotes, then rolls over."
  (let*
    ((n (+ (mod n 10000) (/ n 10000)))
     (thousands (/ n 1000))
     (hundreds (/ (mod n 1000) 100))
     (tens (/ (mod n 100) 10))
     (units (mod n 10))
     (special (if (not (= tens 1)) nil
               (or (when (= units 5) "טו")
               (when (= units 6) "טז")))))
   (concat
     (when (/= 0 thousands) (concat (nth (1- thousands) (nth 0 footnote-hebrew)) "'"))
     (when (/= 0 hundreds) (nth (1- hundreds) (nth 2 footnote-hebrew)))
     (if special special
      (concat
        (when (/= 0 tens) (nth (1- tens) (nth 1 footnote-hebrew)))
        (when (/= 0 units) (nth (1- units) (nth 0 footnote-hebrew))))))))
(add-to-list 'footnote-style-alist `(hebrew Footnote-hebrew ,footnote-hebrew-regex) t)


VERSION INFORMATION
===================
In GNU Emacs 25.2.2 (x86_64-pc-linux-gnu, GTK+ Version 3.22.20)
 of 2017-09-11, modified by Debian built on trouble
System Description:	Devuan GNU/Linux 1.0 (jessie)

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