create more json outputs with useful data

We already create `/index.json` which is used for searching.
This creates two more:
- `/status.json` provides:
    - information about all the existing taxonomies & media
    - information about which transcripts are missing which field.
    - provides the number of transcripts for each language.
- `/directories.json` provides
    - information about all the existing directories (supports nesting
      up to 2 levels) and their total number of transcripts

README.md

@@ -23,6 +23,22 @@ The `preview_branch.sh` script allows you to preview how the changes in your bra
 ./preview_branch.sh <your-github-account> <your-branch-name>
 ```
 
+### Website's metadata
+
+Metadata about the content of the website are automatically generated and can be found at:
+
+- [btctranscripts.com/status.json](https://btctranscripts.com/status.json)
+  ```
+    // information about the existing taxonomies & media
+    existing: {categories: [...], media: [...], speakers: [...], tags: [...] }
+    // information about which transcripts are missing which metadata field
+    missing: {categories: [...], date: [...], media: [...], speakers: [...], tags: [...], transcript_by: [...] }
+    // total number of transcripts for each language
+    transcripts: { en: 'xxx', es: 'xxx', pt: 'xxx', zh: 'xxx'}
+  ```
+- [btctranscripts.com/directories.json](https://btctranscripts.com/directories.json): information about all the existing directories and their total number of transcript (supports nesting up to 2 levels, which is the maximum nesting that we currently have, e.g. `scalingbitcoin/tokyo-2018/edgedevplusplus`).
+
+
 ## i18n
 
 All i18n snippets can be found in the `/i18n` folder. Pre-configured languages are currently Spanish and Portuguese. If you'd like to propose a new language, you can do so by modifying the [site config](https://github.com/bitcointranscripts/bitcointranscripts.github.io/blob/master/config.toml) and translating the appropraite [i18n file](https://github.com/bitcointranscripts/bitcointranscripts.github.io/blob/master/i18n).

config.toml

@@ -29,8 +29,26 @@ DefaultContentLanguage = "en"
     languageName = "简体中文"
     weight = 3
 
+[mediaTypes."application/json"]
+  suffixes = ["json"]
+
+[outputFormats.Index]
+  mediaType = "application/json"
+  baseName = "index"
+  isPlainText = true
+
+[outputFormats.Status]
+  mediaType = "application/json"
+  baseName = "status"
+  isPlainText = true
+
+[outputFormats.Directories]
+  mediaType = "application/json"
+  baseName = "directories"
+  isPlainText = true
+
 [outputs]
-    home = [ "HTML", "JSON"]
+    home = [ "HTML", "Status", "Directories", "Index"]
     page = [ "HTML"]
 
 [params]

themes/ace-documentation/layouts/_default/list.directories.json

@@ -0,0 +1,29 @@
+{{ range .Site.Sections }}
+    {{ $sectionKey := .File.ContentBaseName }}
+    {{ if ne $sectionKey "" }}
+        {{ $section := newScratch }}
+        {{ $.Scratch.SetInMap "result" $sectionKey (len .Pages) }}
+
+        {{ range .Pages }}
+            {{ if eq .BundleType "branch" }}
+                {{ $subsectionKey := .File.ContentBaseName }}
+                {{ $subsection := newScratch }}
+                {{ $section.Set $subsectionKey (len .Pages) }}
+
+                {{ range .Pages }}
+                    {{ if eq .BundleType "branch" }}
+                        {{ $subsection.Set .File.ContentBaseName (len .Pages) }}
+                    {{ end }}
+                {{ end }}
+                {{ if gt ($subsection.Values | len) 0 }}
+                    {{ $section.Set $subsectionKey $subsection.Values }}
+                {{ end }}
+            {{ end }}
+        {{ end }}
+        {{ if gt ($section.Values | len) 0  }}
+            {{ $.Scratch.SetInMap "result" $sectionKey $section.Values }}
+        {{ end }}
+    {{ end }}
+{{ end }}
+
+{{ $.Scratch.Get "result" | jsonify }}

themes/ace-documentation/layouts/_default/list.status.json

@@ -0,0 +1,56 @@
+{{- $.Scratch.Set "missing" (dict "speakers" (slice) "date" (slice) "transcript_by" (slice) "categories" (slice) "tags" (slice) "media" (slice)) -}}
+{{- $.Scratch.Set "es" 0 -}}
+{{- $.Scratch.Set "pt" 0 -}}
+{{- $.Scratch.Set "zh" 0 -}}
+
+{{- range .Site.RegularPages -}}
+    {{- $params := .Params -}}
+    {{- $path := .Permalink -}}
+    {{- range $key, $value := $.Scratch.Get "missing" -}}
+        {{- if not (isset $params $key) -}}
+
+            {{- $.Scratch.SetInMap "missing" $key ($value | append $path) -}}   
+        {{- end -}}
+    {{- end -}}
+
+    {{- with .Translations -}}
+        {{- range . -}}
+            {{- $lang := .Lang -}}
+            {{- $.Scratch.Add $lang 1 -}}
+        {{- end -}}
+    {{- end -}}
+
+{{- end -}}
+
+{{- $.Scratch.Set "transcripts" (dict "en" (len .Site.RegularPages) "es" ($.Scratch.Get "es") "pt" ($.Scratch.Get "pt") "zh" ($.Scratch.Get "zh")) -}}
+
+{{ $speakerData := slice }}
+{{ $tagData := slice }}
+{{ $categoryData := slice }}
+
+{{ range $speaker, $not_used := .Site.Taxonomies.speakers }}
+  {{ $speakerData = $speakerData | append  $speaker }}
+{{ end }}
+
+{{ range $tag, $not_used := .Site.Taxonomies.tags }}
+  {{ $tagData = $tagData | append $tag }}
+{{ end }}
+
+{{ range $category, $not_used := .Site.Taxonomies.categories }}
+  {{ $categoryData = $tagData | append $category }}
+{{ end }}
+
+{{ $media := slice }}
+
+{{ range .Site.RegularPages }}
+  {{ $mediaValue := .Params.media }}
+  {{ if $mediaValue }}
+    {{ $media = $media | append $mediaValue }}
+  {{ end }}
+{{ end }}
+
+{{ $jsonData := dict "speakers" $speakerData "tags" $tagData "categories" $categoryData "media" $media }}
+{{- $.Scratch.SetInMap "status" "existing" $jsonData -}}
+{{- $.Scratch.SetInMap "status" "missing" ($.Scratch.Get "missing") -}}
+{{- $.Scratch.SetInMap "status" "transcripts" ($.Scratch.Get "transcripts") -}}
+{{- $.Scratch.Get "status" | jsonify -}}