feat: move categories to tags

config/filters/index.js

@@ -4,6 +4,7 @@ const advancedFormat = require("dayjs/plugin/advancedFormat");
 
 const postcss = require("postcss");
 const cssnano = require("cssnano");
+const { default: slugify } = require("slugify");
 
 const keys = Object.keys;
 const values = Object.values;
@@ -40,6 +41,43 @@ const filterByCategory = (collection, category) => {
   return collection.filter((item) => item.data.categories.includes(category));
 };
 
+const allTags = (collection, ignore = []) => {
+  const tagSet = new Set(collection.flatMap((item) => item.data.tags));
+
+  ignore.forEach((tag) => tagSet.delete(tag));
+
+  return [...tagSet];
+};
+
+const allTagCounts = (collection, ignore = ["post"]) => {
+  if (!collection.length) {
+    throw new Error("Invalid collection, no items");
+  }
+
+  const tagCounts = new Map();
+
+  for (const item of collection) {
+    const tags = item.data.tags;
+
+    tags?.forEach((tag) => tagCounts.set(tag, (tagCounts.get(tag) || 0) + 1));
+  }
+
+  ignore.forEach((tag) => tagCounts.delete(tag));
+
+  const tagArray = Array.from(tagCounts.entries())
+    .map(([tag, count]) => ({
+      tag,
+      count,
+    }))
+    .sort((a, b) => b.count - a.count);
+
+  return tagArray;
+};
+
+const filter = (collection, filters = []) => {
+  return collection.filter((item) => !filters.includes(item));
+};
+
 module.exports = {
   entries,
   filterByCategory,
@@ -48,4 +86,7 @@ module.exports = {
   minifyCss,
   organizeByDate,
   values,
+  allTags,
+  allTagCounts,
+  filter,
 };