Outline the first working prototype

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go.mod

@@ -0,0 +1,16 @@
+module stacker-beep
+
+go 1.21.1
+
+require (
+	github.com/PuerkitoBio/goquery v1.8.1 // indirect
+	github.com/andybalholm/cascadia v1.3.1 // indirect
+	github.com/faiface/beep v1.1.0 // indirect
+	github.com/hajimehoshi/oto v1.0.1 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8 // indirect
+	golang.org/x/image v0.0.0-20190227222117-0694c2d4d067 // indirect
+	golang.org/x/mobile v0.0.0-20190415191353-3e0bab5405d6 // indirect
+	golang.org/x/net v0.7.0 // indirect
+	golang.org/x/sys v0.5.0 // indirect
+)

go.sum

@@ -0,0 +1,72 @@
+github.com/DATA-DOG/go-sqlmock v1.3.3/go.mod h1:f/Ixk793poVmq4qj/V1dPUg2JEAKC73Q5eFN3EC/SaM=
+github.com/PuerkitoBio/goquery v1.8.1 h1:uQxhNlArOIdbrH1tr0UXwdVFgDcZDrZVdcpygAcwmWM=
+github.com/PuerkitoBio/goquery v1.8.1/go.mod h1:Q8ICL1kNUJ2sXGoAhPGUdYDJvgQgHzJsnnd3H7Ho5jQ=
+github.com/andybalholm/cascadia v1.3.1 h1:nhxRkql1kdYCc8Snf7D5/D3spOX+dBgjA6u8x004T2c=
+github.com/andybalholm/cascadia v1.3.1/go.mod h1:R4bJ1UQfqADjvDa4P6HZHLh/3OxWWEqc0Sk8XGwHqvA=
+github.com/d4l3k/messagediff v1.2.2-0.20190829033028-7e0a312ae40b/go.mod h1:Oozbb1TVXFac9FtSIxHBMnBCq2qeH/2KkEQxENCrlLo=
+github.com/faiface/beep v1.1.0 h1:A2gWP6xf5Rh7RG/p9/VAW2jRSDEGQm5sbOb38sf5d4c=
+github.com/faiface/beep v1.1.0/go.mod h1:6I8p6kK2q4opL/eWb+kAkk38ehnTunWeToJB+s51sT4=
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+github.com/hajimehoshi/go-mp3 v0.3.0/go.mod h1:qMJj/CSDxx6CGHiZeCgbiq2DSUkbK0UbtXShQcnfyMM=
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+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
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main.go

@@ -0,0 +1,255 @@
+package main
+
+import (
+	_ "embed"
+	"flag"
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"regexp"
+	"strings"
+	"time"
+
+	"github.com/PuerkitoBio/goquery"
+	"github.com/faiface/beep"
+	"github.com/faiface/beep/speaker"
+	"github.com/faiface/beep/wav"
+)
+
+//go:embed alert.wav
+var alertSound []byte
+
+const intitialCheck = 300 * time.Minute
+
+var lastChecked time.Time
+
+var (
+	acceptAuthors      []string
+	interestingTopics  []string
+	interestingDomains []string
+	territory          string
+	checkInterval      time.Duration
+	targetURL          string
+)
+
+const (
+	customGray    = "\x1b[37m"
+	customBlu     = "\x1b[36m"
+	customMagenta = "\x1b[38;5;198m"
+	customYellow  = "\x1b[38;5;220m"
+	reset         = "\x1b[0m" // Reset flag
+)
+
+func main() {
+	fmt.Println("")
+
+	authorsPtr := flag.String("authors", "", "Comma-separated list of accepted authors")
+	topicsPtr := flag.String("topics", "", "Comma-separated list of interesting topics")
+	domainsPtr := flag.String("domains", "", "Comma-separated list of interesting domains")
+	territoryPtr := flag.String("territory", "", "Territory, default is home (all)")
+	checkIntervalValue := flag.Int("interval", 5, "Interval check in minutes, default is 5")
+
+	flag.Parse()
+
+	if (*authorsPtr == "") && (*topicsPtr == "") && (*domainsPtr == "") {
+		fmt.Println(customMagenta + "You need to give me some filters!" + reset + "\n")
+		flag.Usage()
+		os.Exit(0)
+	}
+
+	if *authorsPtr != "" {
+		acceptAuthors = strings.Split(*authorsPtr, ",")
+	}
+	if *topicsPtr != "" {
+		interestingTopics = strings.Split(*topicsPtr, ",")
+	}
+	if *domainsPtr != "" {
+		interestingDomains = strings.Split(*domainsPtr, ",")
+	}
+	if *territoryPtr != "" {
+		territory = *territoryPtr
+	}
+
+	if territory != "" {
+		targetURL = "https://stacker.news/~" + territory + "/recent"
+	} else {
+		targetURL = "https://stacker.news/recent"
+	}
+
+	checkInterval = time.Duration(*checkIntervalValue) * time.Minute
+
+	playBeep()
+	// Run initially and start the ticker for periodic scraping
+	checkForNewItems(intitialCheck)
+	ticker := time.NewTicker(checkInterval)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-ticker.C:
+			checkForNewItems(checkInterval)
+		}
+	}
+}
+
+func checkForNewItems(interval time.Duration) {
+	resp, err := http.Get(targetURL)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		log.Fatalf("Error: status code %d", resp.StatusCode)
+	}
+
+	doc, err := goquery.NewDocumentFromReader(resp.Body)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	doc.Find(".item_hunk__DFX1z").Each(func(i int, s *goquery.Selection) {
+		htmlContent, _ := goquery.OuterHtml(s)
+		author := extractAuthor(htmlContent)
+		date := extractDate(htmlContent)
+		title, url := extractTitleAndURL(htmlContent)
+		domain := extractDomain(htmlContent)
+		parsedDate, err := time.Parse(time.RFC3339, date)
+		if err != nil {
+			fmt.Println("Error parsing date:", err)
+			return
+		}
+		if time.Since(parsedDate) < interval &&
+			(isAuthorAccepted(author) ||
+				containsInterestingTopic(title) ||
+				containsInterestingDomains(domain)) {
+			localTime := parsedDate.Local()
+			fmt.Println(customMagenta + author + reset + " - " + customGray + localTime.Format("2006-01-02 15:04") + reset)
+			fmt.Println(customBlu + title + reset)
+			if domain != "" {
+				fmt.Println(domain)
+			}
+			fmt.Println(customYellow + "https://stacker.news" + url + reset + "\n")
+			playBeep()
+		}
+	})
+
+	lastChecked = time.Now()
+}
+
+func extractAuthor(htmlString string) string {
+	re := regexp.MustCompile(`@<!-- -->(\w+)<span>`)
+	matches := re.FindStringSubmatch(htmlString)
+	if len(matches) >= 2 {
+		return matches[1]
+	}
+	return ""
+}
+
+func isAuthorAccepted(author string) bool {
+	if len(acceptAuthors) == 0 {
+		return false
+	}
+	for _, accepted := range acceptAuthors {
+		if author == accepted {
+			return true
+		}
+	}
+	return false
+}
+
+func extractDate(htmlString string) string {
+	re := regexp.MustCompile(`title="(2023[^"]*)"`)
+	matches := re.FindStringSubmatch(htmlString)
+	if len(matches) >= 2 {
+		return matches[1]
+	}
+	return ""
+}
+
+func extractTitleAndURL(htmlString string) (string, string) {
+	re := regexp.MustCompile(`<a[^>]*\bclass="item_title[^"]*"[^>]*\bhref="([^"]+)"[^>]*>([^<]+)</a>`)
+	matches := re.FindStringSubmatch(htmlString)
+	if len(matches) >= 3 {
+		return matches[2], matches[1]
+	}
+	return "", ""
+}
+
+func extractDomain(htmlString string) string {
+	re := regexp.MustCompile(`<a[^>]*\bclass="item_link[^"]*"[^>]*\bhref="([^"]+)"[^>]*>[^<]+</a>`)
+	matches := re.FindStringSubmatch(htmlString)
+	if len(matches) >= 2 {
+		return matches[1]
+	}
+	return ""
+}
+
+func containsInterestingTopic(text string) bool {
+	if len(interestingTopics) == 0 {
+		return false
+	}
+	lowercaseText := strings.ToLower(text)
+	for _, topic := range interestingTopics {
+		if strings.Contains(lowercaseText, topic) {
+			return true
+		}
+	}
+	return false
+}
+
+func containsInterestingDomains(url string) bool {
+	if len(interestingDomains) == 0 {
+		return false
+	}
+	lowercaseText := strings.ToLower(url)
+	for _, topic := range interestingDomains {
+		if strings.Contains(lowercaseText, topic) {
+			return true
+		}
+	}
+	return false
+}
+
+func playBeep() {
+	f, err := os.CreateTemp("", "temp_*.wav")
+	if err != nil {
+		fmt.Println("Error creating temporary WAV file:", err)
+		return
+	}
+	defer os.Remove(f.Name())
+
+	_, err = f.Write(alertSound)
+	if err != nil {
+		fmt.Println("Error writing temporary WAV file:", err)
+		return
+	}
+
+	file, err := os.Open(f.Name())
+	if err != nil {
+		fmt.Println("Error opening temporary WAV file:", err)
+		return
+	}
+	defer file.Close()
+
+	streamer, format, err := wav.Decode(file)
+	if err != nil {
+		fmt.Println("Error decoding WAV file:", err)
+		return
+	}
+	defer streamer.Close()
+
+	err = speaker.Init(format.SampleRate, format.SampleRate.N(time.Second/10))
+	if err != nil {
+		fmt.Println("Error initializing speaker:", err)
+		return
+	}
+
+	done := make(chan struct{})
+	speaker.Play(beep.Seq(streamer, beep.Callback(func() {
+		close(done)
+	})))
+
+	<-done
+}