Make outputs front-matter var a list

- Add test for JSON output creation
  - Add single.json in bare_min layouts/_default for this testing purpose
- Update debugprint.html partial to pretty-print the outputs Param

ox-hugo.el

@@ -1778,6 +1778,10 @@ INFO is a plist used as a communication channel."
                     (org-string-nw-p (mapconcat #'identity
                                                 alias-list
                                                 org-hugo--internal-list-separator))))
+         (outputs-raw (org-string-nw-p
+                       (org-export-data (plist-get info :hugo-outputs) info)))
+         (outputs (when outputs-raw
+                    (org-split-string outputs-raw " ")))
          (lastmod-raw (org-string-nw-p (org-export-data (plist-get info :hugo-lastmod) info)))
          (lastmod-nocolon (cond
                            ;; If the set HUGO_LASTMOD is already in
@@ -1886,7 +1890,7 @@ INFO is a plist used as a communication channel."
                  (lastmod . ,lastmod)
                  (linkTitle . ,(org-export-data (plist-get info :hugo-linktitle) info))
                  (markup . ,(org-export-data (plist-get info :hugo-markup) info))
-                 (outputs . ,(org-export-data (plist-get info :hugo-outputs) info))
+                 (outputs . ,outputs)
                  (slug . ,(org-export-data (plist-get info :hugo-slug) info))
                  (tags . ,tags)
                  (categories . ,categories)

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

@@ -1082,6 +1082,24 @@ The following results in the 'genres' property having the value
 :EXPORT_HUGO_CUSTOM_FRONT_MATTER+: :booleans '(true false)
 :END:
 [[https://github.com/kaushalmodi/ox-hugo/issues/99][Issue # 99]]
+* Outputs                                                           :outputs:
+** Output HTML and JSON                                                :json:
+:PROPERTIES:
+:EXPORT_FILE_NAME: output-html-and-json
+:EXPORT_HUGO_OUTPUTS: html json
+:END:
+*Note*: A =single.json= is required to be at a valid location in the
+template lookup hierarchy for the JSON outputs to be created.
+
+[[./index.json][Here's the JSON output version of this page]].
+** Setting empty outputs is fine                                      :empty:
+:PROPERTIES:
+:EXPORT_FILE_NAME: output-empty
+:EXPORT_HUGO_OUTPUTS:
+:END:
+If the =EXPORT_HUGO_OUTPUTS= property is left empty/unset, =ox-hugo=
+will not set the =outputs= variable in the front-matter at all. So
+only the HTML output will be created (default).
 * Post body                                                            :body:
 ** Summary Splitter
 :PROPERTIES:

test/site/content/posts/output-empty.md

@@ -0,0 +1,9 @@
++++
+title = "Setting empty outputs is fine"
+tags = ["outputs", "empty"]
+draft = false
++++
+
+If the `EXPORT_HUGO_OUTPUTS` property is left empty/unset, `ox-hugo`
+will not set the `outputs` variable in the front-matter at all. So
+only the HTML output will be created (default).

test/site/content/posts/output-html-and-json.md

@@ -0,0 +1,11 @@
++++
+title = "Output HTML and JSON"
+outputs = ["html", "json"]
+tags = ["outputs", "json"]
+draft = false
++++
+
+**Note**: A `single.json` is required to be at a valid location in the
+template lookup hierarchy for the JSON outputs to be created.
+
+[Here's the JSON output version of this page](./index.json).

test/site/themes/bare_min/layouts/_default/single.json

@@ -0,0 +1,7 @@
+{
+    "uri": "{{ .Permalink }}",
+    "title": "{{ .Title | htmlEscape }}",
+    "tags": [{{ range $tindex, $tag := .Params.tags }}{{ if $tindex }}, {{ end }}"{{ $tag| htmlEscape }}"{{ end }}],
+    "description": "{{ .Description | htmlEscape  }}",
+    "content": "{{ range $i, $words := .PlainWords }}{{ $words | htmlEscape  }} {{ end }}"
+}

test/site/themes/bare_min/layouts/partials/debugprint.html

@@ -5,18 +5,19 @@
      {{/* partial "debugprint.html" .GitInfo */}}
      {{/* partial "debugprint.html" (slice "File" .) */}}
 -->
-{{ $value           := . }}
-{{ $type            := (printf "%T" $value) }}
-{{ $typeIsBool      := (eq "bool" $type) }}
-{{ $typeIsString    := (eq "string" $type) }}
-{{ $typeIsTime      := (eq "time.Time" $type) }}
-{{ $typeIsInterface := (eq "interface" $type) }}
-{{ $typeIsSlice     := (findRE "^([[][]]|.*TaxonomyList)" $type) }} <!-- match ^[] -->
-{{ $typeIsMap       := (findRE "^(map[[].+[]]|.*SiteSocial)" $type) }} <!-- match ^map[*] -->
+{{ $value              := . }}
+{{ $type               := (printf "%T" $value) }}
+{{ $typeIsBool         := (eq "bool" $type) }}
+{{ $typeIsString       := (eq "string" $type) }}
+{{ $typeIsTime         := (eq "time.Time" $type) }}
+{{ $typeIsInterface    := (eq "interface" $type) }}
+{{ $typeIsSlice        := (findRE "^([[][]]|.*TaxonomyList|output\\.Formats)" $type) }} <!-- match ^[] -->
+{{ $typeIsMap          := (findRE "^(map[[].+[]]|.*SiteSocial)" $type) }} <!-- match ^map[*] -->
 
-{{ $typeIsSiteInfo  := (eq "*hugolib.SiteInfo" $type) }}
-{{ $typeIsGitInfo   := (findRE "^.*gitmap\\.GitInfo" $type) }}
-{{ $typeIsSpecial   := (or $typeIsSiteInfo $typeIsGitInfo) }}
+{{ $typeIsSiteInfo     := (eq "*hugolib.SiteInfo" $type) }}
+{{ $typeIsGitInfo      := (findRE "^.*gitmap\\.GitInfo" $type) }}
+{{ $typeIsOutputFormat := (eq "output.Format" $type) }}
+{{ $typeIsSpecial      := (or $typeIsSiteInfo $typeIsGitInfo $typeIsOutputFormat) }}
 
 {{ if $typeIsBool }}
     {{ printf "<span class=\"debugprint\"><span class=\"%#v\">%#v</span></span>" $value $value | safeHTML }}
@@ -93,6 +94,17 @@
                     {{ printf "</td></tr>" | safeHTML }}
                 {{ end }}
             </table>
+        {{ else if $typeIsOutputFormat }}
+            {{ $OutputFormatVarNames   := (slice "Name" "MediaType" "Path" "BaseName" "Rel" "Protocol" "IsPlainText" "IsHTML" "NoUgly" "NotAlternative") }}
+            {{ $OutputFormatVarSymbols := (slice .Name  .MediaType  .Path  .BaseName  .Rel  .Protocol  .IsPlainText  .IsHTML  .NoUgly  .NotAlternative ) }}
+            <table>
+                <tr><th class="key">OutputFormat Variable</th><th class="value">Value</th></tr>
+                {{ range $idx, $elem := $OutputFormatVarNames }}
+                    {{ printf "<tr><td class=\"key\">%s</td><td class=\"value\">" $elem | safeHTML }}
+                    {{ partial "debugprint.html" (index $OutputFormatVarSymbols $idx) }} <!-- Recursive call FTW! -->
+                    {{ printf "</td></tr>" | safeHTML }}
+                {{ end }}
+            </table>
         {{ else }}
             {{ printf "%#v" $value | safeHTML }}
         {{ end }}