From 2c69b0c97d40f76363d20478cb799ce4b7518e56 Mon Sep 17 00:00:00 2001
From: Jacky Zhao <j.zhao2k19@gmail.com>
Date: Sat, 09 Dec 2023 00:55:40 +0000
Subject: [PATCH] fix: frontmatter coercion (empty string is falsy)

---
 quartz/plugins/transformers/frontmatter.ts |   29 ++++++++++++++++++++---------
 1 files changed, 20 insertions(+), 9 deletions(-)

diff --git a/quartz/plugins/transformers/frontmatter.ts b/quartz/plugins/transformers/frontmatter.ts
index 58ae7c7..6498a07 100644
--- a/quartz/plugins/transformers/frontmatter.ts
+++ b/quartz/plugins/transformers/frontmatter.ts
@@ -2,16 +2,19 @@
 import remarkFrontmatter from "remark-frontmatter"
 import { QuartzTransformerPlugin } from "../types"
 import yaml from "js-yaml"
-import { slugTag } from "../../path"
+import toml from "toml"
+import { slugTag } from "../../util/path"
 
 export interface Options {
-  language: "yaml" | "toml"
   delims: string | string[]
+  language: "yaml" | "toml"
+  oneLineTagDelim: string
 }
 
 const defaultOptions: Options = {
-  language: "yaml",
   delims: "---",
+  language: "yaml",
+  oneLineTagDelim: ",",
 }
 
 export const FrontMatter: QuartzTransformerPlugin<Partial<Options> | undefined> = (userOpts) => {
@@ -19,31 +22,39 @@
   return {
     name: "FrontMatter",
     markdownPlugins() {
+      const { oneLineTagDelim } = opts
+
       return [
-        remarkFrontmatter,
+        [remarkFrontmatter, ["yaml", "toml"]],
         () => {
           return (_, file) => {
             const { data } = matter(file.value, {
               ...opts,
               engines: {
                 yaml: (s) => yaml.load(s, { schema: yaml.JSON_SCHEMA }) as object,
+                toml: (s) => toml.parse(s) as object,
               },
             })
 
             // tag is an alias for tags
-            if (data.tag) {
-              data.tags = data.tag
+            if (data.tag !== null) {
+              data.tags = data.tag.toString()
             }
 
-            if (data.tags && !Array.isArray(data.tags)) {
+            // coerce title to string
+            if (data.title !== null) {
+              data.title = data.title.toString()
+            }
+
+            if (data.tags !== null && !Array.isArray(data.tags)) {
               data.tags = data.tags
                 .toString()
-                .split(",")
+                .split(oneLineTagDelim)
                 .map((tag: string) => tag.trim())
             }
 
             // slug them all!!
-            data.tags = data.tags?.map((tag: string) => slugTag(tag)) ?? []
+            data.tags = [...new Set(data.tags?.map((tag: string) => slugTag(tag)))] ?? []
 
             // fill in frontmatter
             file.data.frontmatter = {

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