Add plugin to replace strings

website/plugins/index.mjs

@@ -4,9 +4,11 @@ import remarkUnwrapImages from 'remark-unwrap-images'
 import remarkCustomAttrs from './remarkCustomAttrs.mjs'
 import remarkWrapSections from './remarkWrapSections.mjs'
 import remarkCodeBlocks from './remarkCodeBlocks.mjs'
+import remarkFindAndReplace from './remarkFindAndReplace.mjs'
 
 const remarkPlugins = [
     remarkGfm,
+    remarkFindAndReplace,
     remarkUnwrapImages,
     remarkCustomAttrs,
     remarkCodeBlocks,

website/plugins/remarkFindAndReplace.mjs

@@ -0,0 +1,42 @@
+import { visit } from 'unist-util-visit'
+import { replacements } from '../meta/dynamicMeta.mjs'
+
+const prefix = '%%'
+
+// Attaches prefix to the start of the string.
+const attachPrefix = (str) => (prefix || '') + str
+
+// RegExp to find any replacement keys.
+const regexp = RegExp(
+    '(' +
+        Object.keys(replacements)
+            .map((key) => attachPrefix(key))
+            .join('|') +
+        ')',
+    'g'
+)
+
+// Removes prefix from the start of the string.
+const stripPrefix = (str) => (prefix ? str.replace(RegExp(`^${prefix}`), '') : str)
+
+const replacer = (_match, name) => replacements[stripPrefix(name)]
+
+const remarkFindAndReplace = () => (markdownAST) => {
+    // Go through all text, html, code, inline code, and links.
+    visit(markdownAST, ['text', 'html', 'code', 'link'], (node) => {
+        if (node.type === 'link') {
+            // For links, the text value is replaced by text node, so we change the
+            // URL value.
+            const processedText = node.url.replace(regexp, replacer)
+            node.url = processedText
+        } else {
+            // For all other nodes, replace the node value.
+            const processedText = node.value.replace(regexp, replacer)
+            node.value = processedText
+        }
+    })
+
+    return markdownAST
+}
+
+export default remarkFindAndReplace