Add source for ppp (pika package processor)

src/go.mod

@@ -0,0 +1,5 @@
+module ppp/v2
+
+go 1.21.0
+
+require github.com/ulikunitz/xz v0.5.11

src/go.sum

@@ -0,0 +1,2 @@
+github.com/ulikunitz/xz v0.5.11 h1:kpFauv27b6ynzBNT/Xy+1k+fK4WswhN/6PN5WhFAGw8=
+github.com/ulikunitz/xz v0.5.11/go.mod h1:nbz6k7qbPmH4IRqmfOplQw/tblSgqTqBwxkY0oWt/14=

src/main.go

@@ -0,0 +1,74 @@
+package main
+
+import (
+	"bufio"
+	"io"
+	"log"
+	"net/http"
+	"os"
+	"strings"
+
+	"github.com/ulikunitz/xz"
+)
+
+func main() {
+	base := os.Args[1]
+	target := os.Args[2]
+
+	basePackages := processFile(base)
+	targetPackages := processFile(target)
+
+	compare(basePackages, targetPackages)
+}
+
+func processFile(url string) map[string]string {
+
+	resp, err := http.Get(url)
+	if err != nil {
+		panic(err)
+	}
+	defer resp.Body.Close()
+	rdr := io.Reader(resp.Body)
+	if strings.HasSuffix(url, ".xz") {
+		r, err := xz.NewReader(resp.Body)
+		if err != nil {
+			log.Fatalf("xz error %s", err)
+		}
+		rdr = r
+	}
+
+	packages := make(map[string]string)
+	var currentPackage string
+	scanner := bufio.NewScanner(rdr)
+	for scanner.Scan() {
+		line := scanner.Text()
+
+		if line == "" {
+			currentPackage = ""
+		}
+
+		if currentPackage == "" {
+			if strings.HasPrefix(line, "Package: ") {
+				currentPackage = strings.TrimPrefix(line, "Package: ")
+			}
+		} else {
+			if strings.HasPrefix(line, "Version: ") {
+				packages[currentPackage] = strings.TrimPrefix(line, "Version: ")
+			}
+		}
+	}
+	return packages
+
+}
+
+func compare(basePackages map[string]string, targetPackages map[string]string) {
+	for pack, version := range targetPackages {
+		if baseVersion, ok := basePackages[pack]; ok {
+			if baseVersion != version {
+				println(pack)
+			}
+		} else {
+			println(pack)
+		}
+	}
+}