From 258961d79fcb3fdc54e7483bf4e34ed4c22f8666 Mon Sep 17 00:00:00 2001
From: Aaron Carlino <unclecheese@leftandmain.com>
Date: Fri, 20 Dec 2019 10:49:31 +1300
Subject: [PATCH] BUGFIX: Fix purged table css

---
 gatsby-config.js   | 44 ++-------------------------
 purgecss.config.js | 74 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 76 insertions(+), 42 deletions(-)
 create mode 100644 purgecss.config.js

diff --git a/gatsby-config.js b/gatsby-config.js
index 06b1dda..e974042 100644
--- a/gatsby-config.js
+++ b/gatsby-config.js
@@ -1,4 +1,4 @@
-const path = require('path');
+const purgeCSSConfig = require('./purgecss.config');
 const sources = process.env.DOCS_CONTEXT === 'user'
   ? require('./sources-user')
   : require('./sources-docs');
@@ -66,47 +66,7 @@ module.exports = {
     {
       resolve: `gatsby-plugin-purgecss`,
       options: {
-        printRejected: false,
-        whitelist: ['algolia-autocomplete', 'pre', 'code'],
-        ignore: ['prismjs/','docsearch.js/', 'src/theme/assets/search/algolia.css'],
-        content: [
-          // All the markdown in the git repos
-          path.join(process.cwd(), '.cache/gatsby-source-git/**/*.md'),
-          // Components
-          path.join(process.cwd(), 'src/components/!(*.d).{ts,js,jsx,tsx}'),
-          // Static pages (e.g. 404)
-          path.join(process.cwd(), 'src/pages/!(*.d).{ts,js,jsx,tsx}'),
-          // Page templates
-          path.join(process.cwd(), 'src/templates/!(*.d).{ts,js,jsx,tsx}'),
-        ],
-        extractors: [
-          {
-            // Simple extractor just matches against components and templates (e.g. JSX)
-            extractor: class {
-              static extract(content) {
-                return content.match(/[A-Za-z0-9-_:\/]+/g) || [];
-              }
-            },
-            extensions: ['js', 'ts', 'jsx', 'tsx']
-          },
-          {
-            // Match markdown files for icon classes (icon, iconBrand). Add each one to the
-            // allowed selectors defined in FontAwesome. Everything else in FA should be removed.
-            extractor: class  {
-              static extract(content) {
-                const selectors = [`fa-file-alt`]
-                const matches = content.match(/icon(Brand)?: ([a-zA-Z0-9_-]+)/);
-                if (matches) {
-                  const isBrand = typeof matches[1] !== 'undefined';
-                  selectors.push(isBrand ? `fab` : `fas`);
-                  selectors.push(`fa-${matches[2]}`);
-                }
-                return selectors;
-              }
-            },
-            extensions: ['md']
-          },
-        ]
+        ...purgeCSSConfig,
       },
     },
     `gatsby-plugin-remove-serviceworker`,
diff --git a/purgecss.config.js b/purgecss.config.js
new file mode 100644
index 0000000..3b55584
--- /dev/null
+++ b/purgecss.config.js
@@ -0,0 +1,74 @@
+const path = require('path');
+
+// Standard keyword match for React components
+class DefaultExtractor {
+    static extract(content) {
+        return content.match(/[A-Za-z0-9-_:\/]+/g) || [];
+    }
+}
+
+// Scan frontmatter in Markdown docs for icons that they use, e.g. "icon: database"
+class IconExtractor {
+    static extract(content) {
+        const selectors = [`fa-file-alt`]
+        const matches = content.match(/icon(Brand)?: ([a-zA-Z0-9_-]+)/);
+        if (matches) {
+          const isBrand = typeof matches[1] !== 'undefined';
+          selectors.push(isBrand ? `fab` : `fas`);
+          selectors.push(`fa-${matches[2]}`);
+        }
+        return selectors;
+    }
+}
+
+// Classes that are added at build time need to be explicitly ignored
+const whitelist = [
+    // Algolia
+    'algolia-autocomplete',
+
+    // Syntax highlighting
+    'pre',
+    'code',
+];
+
+const whitelistPatterns = [
+    /^callout-/,
+];
+
+const whitelistPatternsChildren = [
+    /^table/,
+];
+
+module.exports = {
+    printRejected: false,
+    whitelist,
+    whitelistPatterns,
+    whitelistPatternsChildren,
+    // Don't try to purge any CSS in the thirdparty libraries that do their own rendering
+    // (syntax highlight, Algolia)
+    ignore: [
+        'prismjs/',
+        'docsearch.js/',
+        'src/theme/assets/search/algolia.css',
+    ],
+    content: [
+      // All the markdown in the git repos
+      path.join(process.cwd(), '.cache/gatsby-source-git/**/*.md'),
+      // Components
+      path.join(process.cwd(), 'src/components/!(*.d).{ts,js,jsx,tsx}'),
+      // Static pages (e.g. 404)
+      path.join(process.cwd(), 'src/pages/!(*.d).{ts,js,jsx,tsx}'),
+      // Page templates
+      path.join(process.cwd(), 'src/templates/!(*.d).{ts,js,jsx,tsx}'),
+    ],
+    extractors : [
+        {
+            extractor: DefaultExtractor,
+            extensions: ['js', 'ts', 'jsx', 'tsx'],
+        },
+        {
+            extractor: IconExtractor,
+            extensions: ['md']
+        }
+    ],
+};
\ No newline at end of file