From c538c151c7462ad0395ff2c15c5e11e89e362aa8 Mon Sep 17 00:00:00 2001
From: Striven <sg.striven@cutecat.club>
Date: Sat, 04 Apr 2026 19:47:16 +0000
Subject: [PATCH] Initial commit

---
 quartz/plugins/transformers/lastmod.ts |   84 ++++++++++++++++++++++++++++++++----------
 1 files changed, 64 insertions(+), 20 deletions(-)

diff --git a/quartz/plugins/transformers/lastmod.ts b/quartz/plugins/transformers/lastmod.ts
index 507b585..32a89cc 100644
--- a/quartz/plugins/transformers/lastmod.ts
+++ b/quartz/plugins/transformers/lastmod.ts
@@ -1,7 +1,8 @@
 import fs from "fs"
-import path from "path"
 import { Repository } from "@napi-rs/simple-git"
 import { QuartzTransformerPlugin } from "../types"
+import path from "path"
+import { styleText } from "util"
 
 export interface Options {
   priority: ("frontmatter" | "git" | "filesystem")[]
@@ -11,47 +12,90 @@
   priority: ["frontmatter", "git", "filesystem"],
 }
 
+// YYYY-MM-DD
+const iso8601DateOnlyRegex = /^\d{4}-\d{2}-\d{2}$/
+
+function coerceDate(fp: string, d: any): Date {
+  // check ISO8601 date-only format
+  // we treat this one as local midnight as the normal
+  // js date ctor treats YYYY-MM-DD as UTC midnight
+  if (typeof d === "string" && iso8601DateOnlyRegex.test(d)) {
+    d = `${d}T00:00:00`
+  }
+
+  const dt = new Date(d)
+  const invalidDate = isNaN(dt.getTime()) || dt.getTime() === 0
+  if (invalidDate && d !== undefined) {
+    console.log(
+      styleText(
+        "yellow",
+        `\nWarning: found invalid date "${d}" in \`${fp}\`. Supported formats: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date#date_time_string_format`,
+      ),
+    )
+  }
+
+  return invalidDate ? new Date() : dt
+}
+
 type MaybeDate = undefined | string | number
-export const CreatedModifiedDate: QuartzTransformerPlugin<Partial<Options> | undefined> = (
-  userOpts,
-) => {
+export const CreatedModifiedDate: QuartzTransformerPlugin<Partial<Options>> = (userOpts) => {
   const opts = { ...defaultOptions, ...userOpts }
   return {
     name: "CreatedModifiedDate",
-    markdownPlugins() {
+    markdownPlugins(ctx) {
       return [
         () => {
           let repo: Repository | undefined = undefined
+          let repositoryWorkdir: string
+          if (opts.priority.includes("git")) {
+            try {
+              repo = Repository.discover(ctx.argv.directory)
+              repositoryWorkdir = repo.workdir() ?? ctx.argv.directory
+            } catch (e) {
+              console.log(
+                styleText(
+                  "yellow",
+                  `\nWarning: couldn't find git repository for ${ctx.argv.directory}`,
+                ),
+              )
+            }
+          }
+
           return async (_tree, file) => {
             let created: MaybeDate = undefined
             let modified: MaybeDate = undefined
             let published: MaybeDate = undefined
 
-            const fp = path.posix.join(file.cwd, file.data.filePath as string)
+            const fp = file.data.relativePath!
+            const fullFp = file.data.filePath!
             for (const source of opts.priority) {
               if (source === "filesystem") {
-                const st = await fs.promises.stat(fp)
+                const st = await fs.promises.stat(fullFp)
                 created ||= st.birthtimeMs
                 modified ||= st.mtimeMs
               } else if (source === "frontmatter" && file.data.frontmatter) {
-                created ||= file.data.frontmatter.date
-                modified ||= file.data.frontmatter.lastmod
-                modified ||= file.data.frontmatter.updated
-                modified ||= file.data.frontmatter["last-modified"]
-                published ||= file.data.frontmatter.publishDate
-              } else if (source === "git") {
-                if (!repo) {
-                  repo = new Repository(file.cwd)
+                created ||= file.data.frontmatter.created as MaybeDate
+                modified ||= file.data.frontmatter.modified as MaybeDate
+                published ||= file.data.frontmatter.published as MaybeDate
+              } else if (source === "git" && repo) {
+                try {
+                  const relativePath = path.relative(repositoryWorkdir, fullFp)
+                  modified ||= await repo.getFileLatestModifiedDateAsync(relativePath)
+                } catch {
+                  console.log(
+                    styleText(
+                      "yellow",
+                      `\nWarning: ${file.data.filePath!} isn't yet tracked by git, dates will be inaccurate`,
+                    ),
+                  )
                 }
-
-                modified ||= await repo.getFileLatestModifiedDateAsync(file.data.filePath!)
               }
             }
 
             file.data.dates = {
-              created: created ? new Date(created) : new Date(),
-              modified: modified ? new Date(modified) : new Date(),
-              published: published ? new Date(published) : new Date(),
+              created: coerceDate(fp, created),
+              modified: coerceDate(fp, modified),
+              published: coerceDate(fp, published),
             }
           }
         },

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