Don't force the final front-matter to YAML because of Pandoc

ox-hugo-pandoc-cite.el

@@ -59,7 +59,7 @@ The list of Pandoc specific meta-data is defined in
     (insert fm)
     (goto-char (point-min))
     (dolist (field ox-hugo-pandoc-cite-pandoc-meta-data)
-      (let ((regexp (format "^%s: " (regexp-quote field))))
+      (let ((regexp (format "^%s\\(:\\| =\\) " (regexp-quote field))))
         (delete-matching-lines regexp)))
     (buffer-substring-no-properties (point-min) (point-max))))
 

ox-hugo.el

@@ -131,6 +131,13 @@ subtree).")
 This variable is used to cache the original ox-hugo generated
 front-matter that's used after Pandoc Citation parsing.")
 
+(defvar org-hugo--fm-yaml nil
+  "Variable to store the current Hugo post's front-matter string in YAML format.
+
+Pandoc understands meta-data only in YAML format. So when Pandoc
+Citations are enabled, Pandoc is handed over the file with this
+YAML front-matter.")
+
 (defvar org-hugo-allow-export-after-save t
   "Enable flag for `org-hugo-export-wim-to-md-after-save'.
 When nil, the above function will not export the Org file to
@@ -974,7 +981,8 @@ This is an internal function."
   (plist-put info :outfile outfile)
   (plist-put info :front-matter org-hugo--fm)
   (ox-hugo-pandoc-cite--parse-citations-maybe info)
-  (setq org-hugo--fm nil))
+  (setq org-hugo--fm nil)
+  (setq org-hugo--fm-yaml nil))
 
 ;;;; HTMLized section number for headline
 (defun org-hugo--get-headline-number (headline info &optional toc)
@@ -2444,7 +2452,9 @@ INFO is a plist holding export options."
                   (format "\n%s" body)
                 "")))
     (setq org-hugo--fm fm)
-    (format "%s%s%s" fm body org-hugo-footer)))
+    (if (org-hugo--plist-get-true-p info :hugo-pandoc-citations)
+        (format "%s%s%s" org-hugo--fm-yaml body org-hugo-footer)
+      (format "%s%s%s" fm body org-hugo-footer))))
 
 ;;;;; Hugo Front Matter
 (defun org-hugo--quote-string (val &optional prefer-no-quotes format)
@@ -2784,11 +2794,7 @@ the Hugo front-matter."
 
 INFO is a plist used as a communication channel."
   ;; (message "[hugo front matter DBG] info: %S" (pp info))
-  (let* ((fm-format (if (org-hugo--plist-get-true-p info :hugo-pandoc-citations)
-                        ;; pandoc parses fields like csl and nocite
-                        ;; from YAML front-matter.
-                        "yaml"
-                      (plist-get info :hugo-front-matter-format)))
+  (let* ((fm-format (plist-get info :hugo-front-matter-format))
          (author-list (and (plist-get info :with-author)
                            (let ((author-raw
                                   (org-string-nw-p
@@ -2956,7 +2962,8 @@ INFO is a plist used as a communication channel."
                  (blackfriday . ,blackfriday)
                  (menu . ,menu-alist)
                  (resources . ,resources)))
-         (data `,(append data weight-data custom-fm-data)))
+         (data `,(append data weight-data custom-fm-data))
+         ret)
     ;; (message "[get fm DBG] tags: %s" tags)
     ;; (message "dbg: hugo tags: %S" (plist-get info :hugo-tags))
     ;; (message "[get fm info DBG] %S" info)
@@ -2970,7 +2977,15 @@ INFO is a plist used as a communication channel."
     ;; (message "[fm categories DBG] %S" categories)
     ;; (message "[fm keywords DBG] %S" keywords)
     (setq data (org-hugo--replace-keys-maybe data info))
-    (org-hugo--gen-front-matter data fm-format)))
+    (setq ret (org-hugo--gen-front-matter data fm-format))
+    (if (and (string= "toml" fm-format)
+             (org-hugo--plist-get-true-p info :hugo-pandoc-citations))
+        ;; Pandoc parses fields like csl and nocite from YAML
+        ;; front-matter.  So create the `org-hugo--fm-yaml'
+        ;; front-matter in YAML format just for Pandoc.
+        (setq org-hugo--fm-yaml (org-hugo--gen-front-matter data "yaml"))
+      (setq org-hugo--fm-yaml ret))
+    ret))
 
 (defun org-hugo--calc-weight ()
   "Calculate the weight for a Hugo post or menu item.

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

@@ -4591,9 +4591,9 @@ This post should also be created in =content/section-a/=.
 #+include: "./all-posts.org::#nested-sections-example" :only-contents t
 * Pandoc                                                             :pandoc:
 ** Citeproc                                                        :citeproc:
-*** Citations Example
+*** Citations Example (TOML)                                           :toml:
 :PROPERTIES:
-:EXPORT_FILE_NAME: citations-example
+:EXPORT_FILE_NAME: citations-example-toml
 :EXPORT_HUGO_PANDOC_CITATIONS: t
 :EXPORT_BIBLIOGRAPHY: bib/bib1.bib, bib/bib2.bib
 :EXPORT_HUGO_CUSTOM_FRONT_MATTER: :nocite '(@giovanelli2016 @eilan2016)
@@ -4601,7 +4601,7 @@ This post should also be created in =content/section-a/=.
 :END:
 #+begin_description
 Test the parsing of Pandoc Citations, while also testing that ox-hugo
-exported Markdown doesn't get broken.
+exported Markdown doesn't get broken -- TOML front-matter.
 #+end_description
 {{{oxhugoissue(175)}}}
 **** Section 1
@@ -4634,6 +4634,30 @@ Text not containing *Markdown*
 | a        | b        | c        |
 | d        | e        | f        |
 |----------+----------+----------|
+*** Citations Example (YAML)                                           :yaml:
+:PROPERTIES:
+:EXPORT_HUGO_FRONT_MATTER_FORMAT: yaml
+:EXPORT_FILE_NAME: citations-example-yaml
+:EXPORT_HUGO_PANDOC_CITATIONS: t
+:EXPORT_BIBLIOGRAPHY: bib/bib1.bib, bib/bib2.bib
+:EXPORT_HUGO_CUSTOM_FRONT_MATTER: :nocite '(@giovanelli2016 @eilan2016)
+:END:
+#+begin_description
+Test the parsing of Pandoc Citations, while also testing that ox-hugo
+exported Markdown doesn't get broken -- YAML front-matter.
+#+end_description
+{{{oxhugoissue(175)}}}
+**** Section 1
+Here is a test example file with an in-text citation where someone
+important says something important (e.g. @loncar2016). And here is
+another bit of blah with a footnote citation.[fn:5]
+
+See [[#citation-example-section-2]].
+**** Section 2
+:PROPERTIES:
+:CUSTOM_ID: citation-example-section-2
+:END:
+Content in section 2.
 * Export Options                                              :export_option:
 ** Table of Contents (TOC)                                              :toc:
 =ox-hugo= has the =with-toc= option disabled by default as Hugo has an

test/site/content/posts/citations-example-toml.md

@@ -1,11 +1,12 @@
----
-title: "Citations Example"
-description: >
++++
+title = "Citations Example (TOML)"
+description = """
   Test the parsing of Pandoc Citations, while also testing that ox-hugo
-  exported Markdown doesn't get broken.
-tags: ["pandoc", "citeproc"]
-draft: false
----
+  exported Markdown doesn't get broken -- TOML front-matter.
+  """
+tags = ["pandoc", "citeproc", "toml"]
+draft = false
++++
 
 `ox-hugo` Issue
 \#[175](https://github.com/kaushalmodi/ox-hugo/issues/175)

test/site/content/posts/citations-example-yaml.md

@@ -0,0 +1,68 @@
+---
+title: "Citations Example (YAML)"
+description: >
+  Test the parsing of Pandoc Citations, while also testing that ox-hugo
+  exported Markdown doesn't get broken -- YAML front-matter.
+tags: ["pandoc", "citeproc", "yaml"]
+draft: false
+---
+
+`ox-hugo` Issue
+\#[175](https://github.com/kaushalmodi/ox-hugo/issues/175)
+
+## Section 1
+
+Here is a test example file with an in-text citation where someone
+important says something important (e.g. Loncar (2016)). And here is
+another bit of blah with a footnote citation.[^1]
+
+See [Section 2](#citation-example-section-2).
+
+## Section 2 {#citation-example-section-2}
+
+Content in section 2.
+
+## References {#references}
+
+<div id="refs .references">
+  <div></div>
+
+
+<div id="ref-eilan2016">
+  <div></div>
+
+Eilan, Naomi. 2016. "You Me and the World." *Analysis* 76 (3): 311--24.
+
+</div>
+
+<div id="ref-giovanelli2016">
+  <div></div>
+
+Giovanelli, Marco. 2016. "\"\...But I Still Can't Get Rid of a Sense of
+Artificiality\" the Reichenbach--Einstein Debate on the Geometrization
+of the Electromagnetic Field." *Studies in History and Philosophy of
+Science* 54: 35--51.
+
+</div>
+
+<div id="ref-loncar2016">
+  <div></div>
+
+Loncar, Samuel. 2016. "Why Listen to Philosophers? A Constructive
+Critique of Disciplinary Philosophy." *Metaphilosophy* 47 (1): 3--25.
+
+</div>
+
+<div id="ref-thompson2016">
+  <div></div>
+
+Thompson, Morgan, Toni Adleberg, Sam Sims, and Eddy Nahmias. 2016. "Why
+Do Women Leave Philosophy? Surveying Students at the Introductory
+Level."
+
+</div>
+
+
+</div> <!-- ending references -->
+
+[^1]: See (Thompson et al. 2016).