[O] filter paragraph function not running

[Samuel Wales]

this is probably user error.

in md output i don't think this is being run and i am not sure why.
in odt, it doesn't work but i am not sure why.

finally, does anybody know a quick way to get paragraphs to look like
i do them instead of indenting the first line and not putting a blank
line, for pdf output?

thanks.

  (add-to-list 'org-export-filter-paragraph-functions
'alpha-org-export-===-rule--par)
  (defun alpha-org-export-===-rule--par (paragraph backend _info)
    "Reverse the new exporter emphasis to get my === back as a
horizontal rule that separates paragraphs with blanks above and below."
    ;; runs after === is converted.  (from the code-font
    ;; interpretation to the backend.)
    (with-no-warnings
      (cond
        ((and (org-export-derived-backend-p backend 'html)
              (or
               (string-match "<p
class=\"footpara\">\n<code>=</code>\n</p>\n*" paragraph)
               (string-match "<p>\n<code>=</code>\n</p>\n*" paragraph)))
         "\n\n<hr width=\"10%\"
style=\"width:10%;color:#000;background-color:#000;height:1px;border:none\"/>\n\n")
        ;; fixme notwork
        ((org-export-derived-backend-p backend 'md)
         (replace-string "`=`" "==="))
        ((org-export-derived-backend-p backend 'odt)
         ;; untested
         (replace-string "<text:span text:style-name=\"OrgCode\">=</text:span>"
                         "<text:span
text:style-name=\"OrgCode\">===</text:span>"))
        ((org-export-derived-backend-p backend 'latex)
         ;; =fact re string needs \\\\, but string needs \\
         ;; (replace-regexp-in-string "\\\\hi" "there" "\\hi" t t)
         ;; (replace-regexp-in-string "\\\\hi{=}" "there" "\\hi{=}" t t)
         ;; seems to work
         (replace-regexp-in-string "\\\\texttt{=}"

"\\\\hspace{\\\\stretch{1}}\\\\rule{0.15\\\\textwidth}{0.1pt}\\\\hspace{\\\\stretch{1}}"
                                   ;; "\\\\centerline{\\\\rule
{0.15\\\\linewidth}{.2pt}}"
                                   paragraph))
        ((and (org-export-derived-backend-p backend 'ascii)
              (string-match "^`='$" paragraph))
         "===\n\n")
        (t paragraph))))

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