From 0998bc355e6425e6b2bdf3d2da7124aa7b63b2a2 Mon Sep 17 00:00:00 2001
From: Jacky Zhao <j.zhao2k19@gmail.com>
Date: Thu, 17 Aug 2023 08:58:11 +0000
Subject: [PATCH] fix rebuild debouncing

---
 quartz/build.ts |  187 +++++++++++++++++++++++++++++++++++-----------
 1 files changed, 143 insertions(+), 44 deletions(-)

diff --git a/quartz/build.ts b/quartz/build.ts
index 36e3210..b5b1f9e 100644
--- a/quartz/build.ts
+++ b/quartz/build.ts
@@ -1,69 +1,168 @@
+import sourceMapSupport from "source-map-support"
+sourceMapSupport.install(options)
 import path from "path"
-import { PerfTimer } from "./perf"
+import { PerfTimer } from "./util/perf"
 import { rimraf } from "rimraf"
-import { globby } from "globby"
+import { isGitIgnored } from "globby"
 import chalk from "chalk"
-import http from "http"
-import serveHandler from "serve-handler"
 import { parseMarkdown } from "./processors/parse"
 import { filterContent } from "./processors/filter"
 import { emitContent } from "./processors/emit"
 import cfg from "../quartz.config"
+import { FilePath, joinSegments, slugifyFilePath } from "./util/path"
+import chokidar from "chokidar"
+import { ProcessedContent } from "./plugins/vfile"
+import { Argv, BuildCtx } from "./util/ctx"
+import { glob, toPosixPath } from "./util/glob"
+import { trace } from "./util/trace"
+import { options } from "./util/sourcemap"
 
-interface Argv {
-  directory: string
-  verbose: boolean
-  output: string
-  serve: boolean
-  port: number
-}
+async function buildQuartz(argv: Argv, clientRefresh: () => void) {
+  const ctx: BuildCtx = {
+    argv,
+    cfg,
+    allSlugs: [],
+  }
 
-export default async function buildQuartz(argv: Argv, version: string) {
-  console.log(chalk.bgGreen.black(`\n Quartz v${version} \n`))
   const perf = new PerfTimer()
   const output = argv.output
 
   const pluginCount = Object.values(cfg.plugins).flat().length
-  const pluginNames = (key: 'transformers' | 'filters' | 'emitters') => cfg.plugins[key].map(plugin => plugin.name)
+  const pluginNames = (key: "transformers" | "filters" | "emitters") =>
+    cfg.plugins[key].map((plugin) => plugin.name)
   if (argv.verbose) {
     console.log(`Loaded ${pluginCount} plugins`)
-    console.log(`  Transformers: ${pluginNames('transformers').join(", ")}`)
-    console.log(`  Filters: ${pluginNames('filters').join(", ")}`)
-    console.log(`  Emitters: ${pluginNames('emitters').join(", ")}`)
+    console.log(`  Transformers: ${pluginNames("transformers").join(", ")}`)
+    console.log(`  Filters: ${pluginNames("filters").join(", ")}`)
+    console.log(`  Emitters: ${pluginNames("emitters").join(", ")}`)
   }
 
-  // clean
-  perf.addEvent('clean')
+  perf.addEvent("clean")
   await rimraf(output)
-  console.log(`Cleaned output directory \`${output}\` in ${perf.timeSince('clean')}`)
+  console.log(`Cleaned output directory \`${output}\` in ${perf.timeSince("clean")}`)
 
-  // glob
-  perf.addEvent('glob')
-  const fps = await globby('**/*.md', {
-    cwd: argv.directory,
-    ignore: cfg.configuration.ignorePatterns,
-    gitignore: true,
-  })
-  console.log(`Found ${fps.length} input files from \`${argv.directory}\` in ${perf.timeSince('glob')}`)
+  perf.addEvent("glob")
+  const allFiles = await glob("**/*.*", argv.directory, cfg.configuration.ignorePatterns)
+  const fps = allFiles.filter((fp) => fp.endsWith(".md"))
+  console.log(
+    `Found ${fps.length} input files from \`${argv.directory}\` in ${perf.timeSince("glob")}`,
+  )
 
-  const filePaths = fps.map(fp => `${argv.directory}${path.sep}${fp}`)
-  const parsedFiles = await parseMarkdown(cfg.plugins.transformers, argv.directory, filePaths, argv.verbose)
-  const filteredContent = filterContent(cfg.plugins.filters, parsedFiles, argv.verbose)
-  await emitContent(argv.directory, output, cfg, filteredContent, argv.verbose)
+  const filePaths = fps.map((fp) => joinSegments(argv.directory, fp) as FilePath)
+  ctx.allSlugs = allFiles.map((fp) => slugifyFilePath(fp as FilePath))
+
+  const parsedFiles = await parseMarkdown(ctx, filePaths)
+  const filteredContent = filterContent(ctx, parsedFiles)
+  await emitContent(ctx, filteredContent)
   console.log(chalk.green(`Done processing ${fps.length} files in ${perf.timeSince()}`))
 
   if (argv.serve) {
-    const server = http.createServer(async (req, res) => {
-      await serveHandler(req, res, {
-        public: output,
-        directoryListing: false,
-      })
-      const status = res.statusCode
-      const statusString = status === 200 ? chalk.green(`[${status}]`) : chalk.red(`[${status}]`)
-      console.log(statusString + chalk.grey(` ${req.url}`))
-    })
-    server.listen(argv.port)
-    console.log(chalk.cyan(`Started a Quartz server listening at http://localhost:${argv.port}`))
-    console.log('hint: exit with ctrl+c')
+    return startServing(ctx, parsedFiles, clientRefresh)
+  }
+}
+
+// setup watcher for rebuilds
+async function startServing(
+  ctx: BuildCtx,
+  initialContent: ProcessedContent[],
+  clientRefresh: () => void,
+) {
+  const { argv } = ctx
+
+  const ignored = await isGitIgnored()
+  const contentMap = new Map<FilePath, ProcessedContent>()
+  for (const content of initialContent) {
+    const [_tree, vfile] = content
+    contentMap.set(vfile.data.filePath!, content)
+  }
+
+  const initialSlugs = ctx.allSlugs
+  let timeoutIds: Set<ReturnType<typeof setTimeout>> = new Set()
+  let toRebuild: Set<FilePath> = new Set()
+  let toRemove: Set<FilePath> = new Set()
+  let trackedAssets: Set<FilePath> = new Set()
+  async function rebuild(fp: string, action: "add" | "change" | "delete") {
+    // don't do anything for gitignored files
+    if (ignored(fp)) {
+      return
+    }
+
+    // dont bother rebuilding for non-content files, just track and refresh
+    fp = toPosixPath(fp)
+    const filePath = joinSegments(argv.directory, fp) as FilePath
+    if (path.extname(fp) !== ".md") {
+      if (action === "add" || action === "change") {
+        trackedAssets.add(filePath)
+      } else if (action === "delete") {
+        trackedAssets.delete(filePath)
+      }
+      clientRefresh()
+      return
+    }
+
+    if (action === "add" || action === "change") {
+      toRebuild.add(filePath)
+    } else if (action === "delete") {
+      toRemove.add(filePath)
+    }
+
+    timeoutIds.forEach((id) => clearTimeout(id))
+
+    // debounce rebuilds every 250ms
+    timeoutIds.add(
+      setTimeout(async () => {
+        const perf = new PerfTimer()
+        console.log(chalk.yellow("Detected change, rebuilding..."))
+        try {
+          const filesToRebuild = [...toRebuild].filter((fp) => !toRemove.has(fp))
+
+          const trackedSlugs = [...new Set([...contentMap.keys(), ...toRebuild, ...trackedAssets])]
+            .filter((fp) => !toRemove.has(fp))
+            .map((fp) => slugifyFilePath(path.posix.relative(argv.directory, fp) as FilePath))
+
+          ctx.allSlugs = [...new Set([...initialSlugs, ...trackedSlugs])]
+          const parsedContent = await parseMarkdown(ctx, filesToRebuild)
+          for (const content of parsedContent) {
+            const [_tree, vfile] = content
+            contentMap.set(vfile.data.filePath!, content)
+          }
+
+          for (const fp of toRemove) {
+            contentMap.delete(fp)
+          }
+
+          await rimraf(argv.output)
+          const parsedFiles = [...contentMap.values()]
+          const filteredContent = filterContent(ctx, parsedFiles)
+          await emitContent(ctx, filteredContent)
+          console.log(chalk.green(`Done rebuilding in ${perf.timeSince()}`))
+        } catch {
+          console.log(chalk.yellow(`Rebuild failed. Waiting on a change to fix the error...`))
+        }
+
+        clientRefresh()
+        toRebuild.clear()
+        toRemove.clear()
+      }, 250),
+    )
+  }
+
+  const watcher = chokidar.watch(".", {
+    persistent: true,
+    cwd: argv.directory,
+    ignoreInitial: true,
+  })
+
+  watcher
+    .on("add", (fp) => rebuild(fp, "add"))
+    .on("change", (fp) => rebuild(fp, "change"))
+    .on("unlink", (fp) => rebuild(fp, "delete"))
+}
+
+export default async (argv: Argv, clientRefresh: () => void) => {
+  try {
+    return await buildQuartz(argv, clientRefresh)
+  } catch (err) {
+    trace("\nExiting Quartz due to a fatal error", err as Error)
   }
 }

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