update upgrade script

upgrade/go.mod

@@ -1,5 +0,0 @@
-module github.com/mattn/go-sqlite3/upgrade
-
-go 1.19
-
-require github.com/PuerkitoBio/goquery v1.7.1 // indirect

upgrade/go.sum

@@ -1,12 +0,0 @@
-github.com/PuerkitoBio/goquery v1.7.1 h1:oE+T06D+1T7LNrn91B4aERsRIeCLJ/oPSa6xB9FPnz4=
-github.com/PuerkitoBio/goquery v1.7.1/go.mod h1:XY0pP4kfraEmmV1O7Uf6XyjoslwsneBbgeDjLYuN8xY=
-github.com/andybalholm/cascadia v1.2.0 h1:vuRCkM5Ozh/BfmsaTm26kbjm0mIOM3yS5Ek/F5h18aE=
-github.com/andybalholm/cascadia v1.2.0/go.mod h1:YCyR8vOZT9aZ1CHEd8ap0gMVm2aFgxBp0T0eFw1RUQY=
-golang.org/x/net v0.0.0-20180218175443-cbe0f9307d01/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/net v0.0.0-20210614182718-04defd469f4e h1:XpT3nA5TvE525Ne3hInMh6+GETgn27Zfm9dxsThnX2Q=
-golang.org/x/net v0.0.0-20210614182718-04defd469f4e/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
-golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
-golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=

upgrade/package.go

@@ -1,5 +0,0 @@
-// Package upgrade is a dummy package to ensure package can be loaded
-//
-// This file is to avoid the following error:
-// can't load package: package go-sqlite3/upgrade: build constraints exclude all Go files in go-sqlite3\upgrade
-package upgrade

upgrade/upgrade.go

@@ -7,6 +7,7 @@ import (
 	"archive/zip"
 	"bufio"
 	"bytes"
+	"errors"
 	"fmt"
 	"io"
 	"io/ioutil"
@@ -15,36 +16,49 @@ import (
 	"os"
 	"path"
 	"path/filepath"
+	"runtime"
 	"strings"
-	"time"
-
-	"github.com/PuerkitoBio/goquery"
 )
 
 func download(prefix string) (url string, content []byte, err error) {
-	year := time.Now().Year()
-
-	site := "https://www.sqlite.org/download.html"
-	//fmt.Printf("scraping %v\n", site)
-	doc, err := goquery.NewDocument(site)
+	resp, err := http.Get("https://www.sqlite.org/download.html")
 	if err != nil {
-		log.Fatal(err)
+		return "", nil, err
 	}
+	defer resp.Body.Close()
 
-	doc.Find("a").Each(func(_ int, s *goquery.Selection) {
-		if strings.HasPrefix(s.Text(), prefix) {
-			url = fmt.Sprintf("https://www.sqlite.org/%d/", year) + s.Text()
+	b, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return "", nil, err
+	}
+	html := string(b)
+	start := strings.Index(html, `<!-- Download product data for scripts to read`)
+	if start == -1 {
+		return "", nil, errors.New("Unable to find download section on sqlite.org")
+	}
+	html = html[start:]
+	end := strings.Index(html, `-->`)
+	if end == -1 {
+		return "", nil, errors.New("Unable to find download section on sqlite.org")
+	}
+	html = html[:end]
+	for _, line := range strings.Split(html, "\n") {
+		if strings.Contains(line, prefix) {
+			if tok := strings.Split(line, ","); len(tok) >= 5 {
+				url = fmt.Sprintf("https://www.sqlite.org/%s", tok[2])
+				break
+			}
 		}
-	})
+	}
 
 	if url == "" {
 		return "", nil, fmt.Errorf("Unable to find prefix '%s' on sqlite.org", prefix)
 	}
 
 	fmt.Printf("Downloading %v\n", url)
-	resp, err := http.Get(url)
+	resp, err = http.Get(url)
 	if err != nil {
-		log.Fatal(err)
+		return "", nil, err
 	}
 
 	// Ready Body Content
@@ -98,13 +112,13 @@ func mergeFile(src string, dst string) error {
 func main() {
 	fmt.Println("Go-SQLite3 Upgrade Tool")
 
-	wd, err := os.Getwd()
-	if err != nil {
-		log.Fatal(err)
+	_, file, _, ok := runtime.Caller(0)
+	if !ok {
+		log.Fatal("could not get current file info")
 	}
-	if filepath.Base(wd) != "upgrade" {
-		log.Printf("Current directory is %q but should run in upgrade directory", wd)
-		os.Exit(1)
+	err := os.Chdir(filepath.Dir(filepath.Dir(file)))
+	if err != nil {
+		log.Fatalf("could not change directory: %s", err)
 	}
 
 	// Download Amalgamation