Prevent a footnote ref at EOL to be on a new line by itself

Fixes #96

https://discourse.gohugo.io/t/is-it-possible-to-enforce-the-footnote-number-to-render-on-same-line-as-preceding-symbol/9085

Workaround for russross/blackfriday#405

ox-hugo.el

@@ -1214,6 +1214,16 @@ CONTENTS is the paragraph contents.  INFO is a plist used as a
 communication channel."
   (unless (org-hugo--plist-get-true-p info :hugo-preserve-filling)
     (setq contents (concat (mapconcat 'identity (split-string contents) " ") "\n")))
+  ;; Glue EOL footnotes to the last words using   so that the
+  ;; footnote reference does not end up on a new line by itself.
+  (setq contents (replace-regexp-in-string
+                  ;; "word FN.?$" -> "word FN.?$"
+                  "[[:blank:]]+\\(\\[\\^[^]]+\\]\\)\\([[:blank:]]*[.]*\\)$" " \\1\\2"
+                  (replace-regexp-in-string
+                   ;; "FN .$" -> "FN.$"
+                   "\\(\\[\\^[^]]+\\]\\)[[:blank:]]*\\(\\.+\\)$" "\\1\\2"
+                   contents)))
+  ;; (message "[org-hugo-paragraph DBG] para: %s" contents)
   (org-md-paragraph paragraph contents info))
 
 ;;;; Source Blocks

test/site/content-org/all-posts.org

@@ -1161,6 +1161,61 @@ This is some text[fn:1].
 :EXPORT_FILE_NAME: multi-line-footnote
 :END:
 This is some text[fn:3].
+** Footnotes at End of line
+:PROPERTIES:
+:EXPORT_FILE_NAME: footnotes-at-eol
+:END:
+*** Last word, followed by FOOTNOTE PERIOD
+a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a[fn:1].
+
+ab a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a[fn:1].
+
+abc a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a a[fn:1].
+
+abcd a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a a[fn:1].
+*** Last word, followed by FOOTNOTE *space* PERIOD
+a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a[fn:1] .
+
+ab a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a[fn:1] .
+
+abc a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a a[fn:1] .
+
+abcd a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a a[fn:1] .
+*** Last word, followed by *space* FOOTNOTE *space* PERIOD
+a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a [fn:1] .
+
+ab a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a [fn:1] .
+
+abc a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a [fn:1] .
+
+abcd a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a [fn:1] .
+
+abcde a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a a [fn:1] .
+*** Last word, followed by PERIOD *space* FOOTNOTE
+a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a. [fn:1]
+
+ab a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a. [fn:1]
+
+abc a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a a. [fn:1]
+
+abcd a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a a. [fn:1]
 * Tags
 ** Basic tags                                                       :abc:def:
 :PROPERTIES:

test/site/content/posts/footnotes-at-eol.md

@@ -0,0 +1,69 @@
++++
+title = "Footnotes at End of line"
+tags = ["footnote"]
+draft = false
++++
+
+## Last word, followed by FOOTNOTE PERIOD {#last-word-followed-by-footnote-period}
+
+a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a[^fn:1].
+
+ab a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a[^fn:1].
+
+abc a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a a[^fn:1].
+
+abcd a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a a[^fn:1].
+
+
+## Last word, followed by FOOTNOTE **space** PERIOD {#last-word-followed-by-footnote-space-period}
+
+a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a[^fn:1].
+
+ab a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a[^fn:1].
+
+abc a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a a[^fn:1].
+
+abcd a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a a[^fn:1].
+
+
+## Last word, followed by **space** FOOTNOTE **space** PERIOD {#last-word-followed-by-space-footnote-space-period}
+
+a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a [^fn:1].
+
+ab a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a [^fn:1].
+
+abc a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a [^fn:1].
+
+abcd a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a [^fn:1].
+
+abcde a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a a [^fn:1].
+
+
+## Last word, followed by PERIOD **space** FOOTNOTE {#last-word-followed-by-period-space-footnote}
+
+a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a. [^fn:1]
+
+ab a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a. [^fn:1]
+
+abc a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a a. [^fn:1]
+
+abcd a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
+a a a. [^fn:1]
+
+[^fn:1]: First footnote