From e67c7b9ab722beb884b81a51ca74fe3d9605f410 Mon Sep 17 00:00:00 2001
From: Paul Duncan <pabs@pablotron.org>
Date: Wed, 20 Oct 2021 18:40:26 -0400
Subject: hugo-pt2021: add table shortcode

---
 themes/hugo-pt2021/layouts/shortcodes/table.html | 299 +++++++++++++++++++++++
 1 file changed, 299 insertions(+)
 create mode 100644 themes/hugo-pt2021/layouts/shortcodes/table.html

(limited to 'themes/hugo-pt2021/layouts/shortcodes')

diff --git a/themes/hugo-pt2021/layouts/shortcodes/table.html b/themes/hugo-pt2021/layouts/shortcodes/table.html
new file mode 100644
index 0000000..4f7c337
--- /dev/null
+++ b/themes/hugo-pt2021/layouts/shortcodes/table.html
@@ -0,0 +1,299 @@
+{{/*
+Custom Hugo table shortcode which renders tables by:
+
+1. Reads table definition and data from a structured (JSON, TOML, or
+   YAML) data file in the site data directory.
+2. Renders the table using CSS classes rather than inline styles.
+
+Why does this shortcode exist?
+
+1. The default Markdown table markup in Hugo is horrible for anything
+   more than rudimentary tables.
+2. The default Markdown table renderer in Hugo does not give you a way
+   to set cell alignment without using inline styles, which means
+   enabling `unsafe-inline` in your `Content-Security-Policy` header.
+3. I prever specifying table contents in an external structured file
+   rather than inline.
+
+Features:
+
+* Sets reasonable default `title` and `aria-label` attributes on
+  table, column headers, and cells.
+* Annotates column headers and cells with coordinate and column ID data
+  attributes for easy styling.
+* Add an optional table caption.
+* Add optional table, header, row, and cell IDs.
+* Specify cell alignment on a per-column or per-cell basis,
+* Specify custom table, row, and cell CSS classes.
+* Use a custom `data-` attribute prefix to prevent collisions.
+* Render cell values as markup or raw HTML.
+
+By default this shortcode renders using Bulma classes, but that can be
+changed by setting individual CSS classes in the `params.table_shortcode`
+section of the site's `config.toml`.
+
+... TODO: move documentation to README.md, document all options ...
+Notes:
+* IDs keys that begin with "_" should not be used, because we use
+  them to set some option.
+* document `params.table_shortcode` TOML options
+* document cell values as literal or as dict (latter allows custom
+  alignment, id, colspan, and rowspan, class)
+* row tooltip with _row and id with _id
+
+Example:
+
+  {{< table "favorite-fruits" "fruits" >}}
+
+And the corresponding `data/favorite-fruits/fruits.yaml`:
+
+  ---
+  # table name (required)
+  name: "Favorite Fruits"
+
+  # column list (required)
+  cols:
+    - id: "name"
+      name: "Name"
+    - id: "color"
+      name: "Color"
+    - id: "description"
+      name: "Description"
+
+  # table rows (required)
+  rows:
+    - name: "Apple"
+      color: "Red or Green"
+      description: "Sweet if red, or sour if green."
+    - name: "Banana"
+      color: "Yellow"
+      description: "Skin is slipping hazard on floor."
+    - name: "Orange"
+      color: "Orange"
+      description: "Citrus bonanza."
+    - name: "Peach"
+      color: "Orange"
+      description: "Don't eat the core!"
+
+This shortcode will render the following table:
+
+    <table class='table' title='Favorite Fruits' aria-label='Favorite Fruits'>
+      <caption>My favorite fruits.</caption>
+
+      <thead>
+        <tr>
+          <th title='Name' aria-label='Name' data-th_x='0' data-col_id='name'>
+            Name
+          </th>
+
+          <th title='Color' aria-label='Color' data-th_x='1' data-col_id='color'>
+            Color
+          </th>
+
+          <th title='Description' aria-label='Description' data-th_x='2' data-col_id='description'>
+            Description
+          </th>
+        </tr>
+      </thead>
+
+      <tbody>
+        <tr data-tr_y='0'>
+          <td title='Name' aria-label='Name' data-td_x='0' data-col_id='name'>
+            Apple
+          </td>
+
+          <td title='Color' aria-label='Color' data-td_x='1' data-col_id='color'>
+            Red or Green
+          </td>
+
+          <td title='Description' aria-label='Description' data-td_x='2' data-col_id='description'>
+            Sweet if red, or sour if green.
+          </td>
+        </tr>
+
+        ... (other rows omitted for brevity) ...
+      </tbody>
+    </table>
+
+You can also configure alignment on a per-column or per-cell basis, and
+you can override the `class` attribute for individual cells.
+*/}}
+
+{{/* get config from site params (default to bulma) */}}
+{{- $config := default (dict "data_prefix" "" "table_base_css" "table" "cell_align_left" "has-text-left" "cell_align_center" "has-text-centered" "cell_align_justified" "has-text-justified" "cell_align_right" "has-text-right") $.Site.Params.table_shortcode -}}
+
+{{/* get data prefix */}}
+{{- $dp := $config.data_prefix | safeHTMLAttr -}}
+
+{{/* get table data */}}
+{{- $table := (index .Site.Data.tables (.Get 0) (.Get 1)) -}}
+
+<table
+  {{/* emit table ID */}}
+  {{- if $table.id -}}id='{{- $table.id -}}'{{- end -}}
+
+  {{/* base (e.g. "table" in bulma) and custom CSS class for table */}}
+  class='{{- $config.table_base_css }} {{ default "" $table.css -}}'
+
+  {{/* table tooltip and ARIA label */}}
+  title='{{- default $table.name $table.tip -}}'
+  arial-label='{{- default $table.name $table.tip -}}'
+>
+  {{- if $table.caption -}}
+    {{/* render caption */}}
+    <caption>{{- $table.caption -}}</caption>
+  {{- end -}}
+
+  {{/* render table headers */}}
+  <thead>
+    <tr>
+      {{- range $x, $col := $table.cols -}}
+        <th
+          title='{{- default $col.tip $col.name -}}'
+          aria-label='{{- default $col.tip $col.name -}}'
+          data-{{- $dp -}}th_x='{{- $x -}}'
+          data-{{- $dp -}}='{{- $col.id -}}'
+        >
+          {{- $col.name -}}
+        </th>
+      {{- end -}}
+    </tr>
+  </thead>
+
+  {{- if $table.rows -}}
+    <tbody>
+      {{/* render rows */}}
+      {{- range $y, $row := $table.rows -}}
+        <tr
+          {{/* emit row ID */}}
+          {{- if $row._id -}}
+            id='{{- $row._id -}}'
+          {{- end -}}
+
+          {{- if $row._tip -}}
+            {{/* emit row tooltip */}}
+            title='{{- $row._tip -}}'
+            aria-label='{{- $row._tip -}}'
+          {{- end -}}
+
+          {{- if $row._css -}}
+            {{/* emit row css */}}
+            class='{{- $row._css -}}'
+          {{- end -}}
+
+          {{/* row position */}}
+          data-{{- $dp -}}tr_y='{{- $y -}}'
+        >
+          {{- range $x, $col := $table.cols -}}
+            {{/* get cell */}}
+            {{- $cell := index $row $col.id -}}
+            {{- $is_map := reflect.IsMap $cell -}}
+
+            {{/* get cell value */}}
+            {{- $val := "" -}}
+            {{- if $is_map -}}
+              {{- $val = index $cell "val" -}}
+            {{- else -}}
+              {{- $val = $cell -}}
+            {{- end -}}
+
+            {{/* get cell ID */}}
+            {{- $cell_id := "" -}}
+            {{- if $is_map -}}
+              {{- if index $cell "id" -}}
+                {{- $cell_id = $cell.id -}}
+              {{- end -}}
+            {{- end -}}
+
+            {{/* get cell tip */}}
+            {{- $tip := (default $col.tip $col.name) -}}
+            {{- if $is_map -}}
+              {{- if index $cell "tip" -}}
+                {{- $tip = index $cell "tip" -}}
+              {{- end -}}
+            {{- end -}}
+
+            {{/* get cell alignment */}}
+            {{- $align := $col.align -}}
+            {{- if and $is_map -}}
+              {{- if (index $cell "align") -}}
+                {{- $align = index $cell "align" -}}
+              {{- end -}}
+            {{- end -}}
+
+            {{/* get default cell css */}}
+            {{- $css := "" -}}
+            {{- if eq $align "left" -}}
+              {{- $css = $config.cell_align_left -}}
+            {{- else if eq $align "center" -}}
+              {{- $css = $config.cell_align_center -}}
+            {{- else if eq $align "justified" -}}
+              {{- $css = $config.cell_align_justified -}}
+            {{- else if eq $align "right" -}}
+              {{- $css = $config.cell_align_right -}}
+            {{- end -}}
+
+            {{/* get cell css override */}}
+            {{- if $is_map -}}
+              {{- if index $cell "css" -}}
+                {{- $css = $cell.css -}}
+              {{- end -}}
+            {{- end -}}
+
+            {{/* get colspan */}}
+            {{- $colspan := 1 -}}
+            {{- if $is_map -}}
+              {{- if index $cell "colspan" -}}
+                {{- $colspan = $cell.colspan -}}
+              {{- end -}}
+            {{- end -}}
+
+            {{/* get rowspan */}}
+            {{- $rowspan := 1 -}}
+            {{- if $is_map -}}
+              {{- if index $cell "rowspan" -}}
+                {{- $rowspan = $cell.rowspan -}}
+              {{- end -}}
+            {{- end -}}
+
+            {{/* emit cell */}}
+            <td
+              {{/* emit cell ID */}}
+              {{- if $cell_id -}}
+                id='{{- $cell_id -}}'
+              {{- end -}}
+
+              title='{{- $tip -}}'
+              aria-label='{{- $tip -}}'
+              class='{{- $css -}}'
+
+              data-{{- $dp -}}td_x='{{- $x -}}'
+              data-{{- $dp -}}col_id='{{- $col.id -}}'
+
+              {{- if gt $colspan 1 -}}
+                colspan='{{- $colspan -}}'
+              {{- end -}}
+
+              {{- if gt $rowspan 1 -}}
+                rowspan='{{- $rowspan -}}'
+              {{- end -}}
+            >
+              {{- if $is_map -}}
+                {{- if $cell.html -}}
+                  {{/* render as raw HTML */}}
+                  {{- $val | safeHTML -}}
+                {{- else -}}
+                  {{/* render as markup */}}
+                  {{- $val | $.Page.RenderString -}}
+                {{- end -}}
+              {{- else -}}
+                {{/* render as markup */}}
+                {{- $val | $.Page.RenderString -}}
+              {{- end -}}
+            </td>
+          {{- end -}}
+        </tr>
+      {{- end -}}
+    </tbody>
+  {{- end -}}
+</table>
-- 
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