From 392cd30dda49503c967b1239f72fe53b98ba63cc Mon Sep 17 00:00:00 2001
From: Jordan <me@jordan.im>
Date: Thu, 10 Feb 2022 13:58:06 -0700
Subject: crawl: create new directory to store crawl contents, resume param

---
 cmd/crawl/crawl.go | 39 +++++++++++++++++++++++++++------------
 1 file changed, 27 insertions(+), 12 deletions(-)

diff --git a/cmd/crawl/crawl.go b/cmd/crawl/crawl.go
index 90f19d6..b3ab049 100644
--- a/cmd/crawl/crawl.go
+++ b/cmd/crawl/crawl.go
@@ -35,7 +35,7 @@ var (
 	depth          = flag.Int("depth", -1, "maximum link depth")
 	validSchemes   = flag.String("schemes", "http,https", "comma-separated list of allowed protocols")
 	excludeRelated = flag.Bool("exclude-related", false, "do not include related resources (css, images, etc) if their URL is not in scope")
-	outputFile     = flag.String("output", "crawl.warc.gz", "output WARC file or pattern (patterns must include a \"%s\" literal token)")
+	resumeDir      = flag.String("resume", "", "path to directory of previous crawl to resume")
 	warcFileSizeMB = flag.Int("output-max-size", 100, "maximum output WARC file size (in MB) when using patterns")
 	cpuprofile     = flag.String("cpuprofile", "", "create cpu profile")
 
@@ -267,16 +267,8 @@ func (b *byteCounter) Read(buf []byte) (int, error) {
 	return n, err
 }
 
-func warcWriterFromFlags() (w *warc.Writer, err error) {
-	if strings.Contains(*outputFile, "%s") {
-		w, err = warc.NewMultiWriter(*outputFile, uint64(*warcFileSizeMB)*1024*1024)
-	} else {
-		var f *os.File
-		f, err = os.Create(*outputFile)
-		if err == nil {
-			w = warc.NewWriter(f)
-		}
-	}
+func warcWriterFromFlags(host string) (w *warc.Writer, err error) {
+	w, err = warc.NewMultiWriter(host+"-%s.warc.gz", uint64(*warcFileSizeMB)*1024*1024)
 	return
 }
 
@@ -296,6 +288,9 @@ func main() {
 	}
 
 	seeds := crawl.MustParseURLs(flag.Args())
+	if len(seeds) == 0 {
+		log.Fatal("no seed URL provided")
+	}
 	scope := crawl.AND(
 		crawl.NewSchemeScope(strings.Split(*validSchemes, ",")),
 		crawl.NewDepthScope(*depth),
@@ -306,7 +301,27 @@ func main() {
 		scope = crawl.AND(crawl.OR(scope, crawl.NewIncludeRelatedScope()), crawl.NewRegexpIgnoreScope(excludes))
 	}
 
-	w, err := warcWriterFromFlags()
+	// Use first URL's host in crawl directory/file names
+	host := seeds[0].Host
+	if *resumeDir != "" {
+		err := os.Chdir(*resumeDir)
+		if err != nil {
+			log.Fatal(err)
+		}
+	} else {
+		if _, err := os.Stat(host); os.IsNotExist(err) {
+			err := os.Mkdir(host, 0700)
+			if err != nil {
+				log.Fatal(err)
+			}
+		}
+		err := os.Chdir(host)
+		if err != nil {
+			log.Fatal(err)
+		}
+	}
+
+	w, err := warcWriterFromFlags(host)
 	if err != nil {
 		log.Fatal(err)
 	}
-- 
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