Wrapping base64-encoded files at 76 chars

like it should be!

conway/web.go

@@ -39,24 +39,24 @@ var WebAssets webAssetStrings
 
 func init() {
 	rand.Seed(time.Now().UTC().UnixNano())
-	jqmin, err := fromGzB64(JQUERY_MIN_JS)
-	if err != nil {
-		log.Fatal("Failed to decode internal jquery.min.js")
-	}
-	WebAssets.JqueryMinJS = jqmin
-
-	normCss, err := fromGzB64(NORMALIZE_CSS)
-	if err != nil {
-		log.Fatal("Failed to decode internal normalize.css")
-	}
-	WebAssets.NormalizeCSS = normCss
-
 	idxHt, err := fromGzB64(GAME_OF_LIFE_INDEX_HTML)
 	if err != nil {
-		log.Fatal("Failed to decode internal index.html")
+		log.Fatal("Failed to decode internal index.html: ", err)
 	}
 
 	WebAssets.IndexHTML = idxHt
+
+	normCss, err := fromGzB64(NORMALIZE_CSS)
+	if err != nil {
+		log.Fatal("Failed to decode internal normalize.css: ", err)
+	}
+	WebAssets.NormalizeCSS = normCss
+
+	jqmin, err := fromGzB64(JQUERY_MIN_JS)
+	if err != nil {
+		log.Fatal("Failed to decode internal jquery.min.js: ", err)
+	}
+	WebAssets.JqueryMinJS = jqmin
 }
 
 func fromGzB64(input string) ([]byte, error) {

conway/web_assets/gen.go

@@ -7,16 +7,21 @@ import (
 	"encoding/base64"
 	"errors"
 	"fmt"
+	"io"
 	"io/ioutil"
 	"log"
 	"net/http"
 	"os"
+	"strings"
 	"text/template"
 	"time"
 )
 
+const b64Width = 76
+
 var (
 	webAssetsTmpl = template.Must(template.New("web_assets").Parse("" +
+		"// WARNING: GENERATED FILE, NERDS! {{.Now}}\n" +
 		"package conway\n" +
 		"\n" +
 		"const (\n" +
@@ -40,13 +45,77 @@ func die(err error) {
 }
 
 func toB64(input []byte) string {
-	return base64.StdEncoding.EncodeToString(input)
+	var (
+		err error
+		out bytes.Buffer
+	)
+	encoded := base64.StdEncoding.EncodeToString(input)
+	lenEncoded := len(encoded)
+
+	outbuf := bufio.NewWriter(&out)
+	inbuf := strings.NewReader(encoded)
+
+	outbuf.WriteByte('\n')
+	if err != nil {
+		die(err)
+	}
+
+	nWritten := 0
+	for {
+		for n := 0; n < b64Width; n++ {
+			c, err := inbuf.ReadByte()
+			if err == io.EOF {
+				break
+			}
+
+			if err != nil {
+				die(err)
+			}
+
+			err = outbuf.WriteByte(c)
+			if err != nil {
+				die(err)
+			}
+
+			nWritten++
+		}
+
+		_, err := inbuf.ReadByte()
+		if err == io.EOF {
+			break
+		}
+
+		if err != nil {
+			die(err)
+		}
+
+		err = inbuf.UnreadByte()
+		if err != nil {
+			die(err)
+		}
+
+		err = outbuf.WriteByte('\n')
+		if err != nil {
+			die(err)
+		}
+	}
+
+	if nWritten != lenEncoded {
+		die(errors.New(fmt.Sprintf("base64-encoded length = %d, but wrote %d",
+			lenEncoded, nWritten)))
+	}
+
+	outbuf.Flush()
+	return string(out.Bytes())
 }
 
 func toGz(input []byte) []byte {
 	var buf bytes.Buffer
 
-	zwriter := gzip.NewWriter(&buf)
+	zwriter, err := gzip.NewWriterLevel(&buf, gzip.BestCompression)
+	if err != nil {
+		die(err)
+	}
 
 	zbuf := bufio.NewWriter(zwriter)
 
@@ -94,15 +163,19 @@ func fetchIndexHtml(indexHtmlPath string) []byte {
 	return body
 }
 
+func toB64Gz(input []byte) string {
+	return string(toB64(toGz(input)))
+}
+
 func main() {
 	if len(os.Args) < 2 {
 		die(errors.New(fmt.Sprintf("Usage: %s <index.html-path>", os.Args[0])))
 	}
 
 	assets := &webAssetStrings{
-		IndexHTML:    toB64(toGz(fetchIndexHtml(os.Args[1]))),
-		NormalizeCSS: toB64(toGz(fetchUrl(normalizeCssUrl))),
-		JqueryMinJS:  toB64(toGz(fetchUrl(jqueryMinJsUrl))),
+		IndexHTML:    toB64Gz(fetchIndexHtml(os.Args[1])),
+		NormalizeCSS: toB64Gz(fetchUrl(normalizeCssUrl)),
+		JqueryMinJS:  toB64Gz(fetchUrl(jqueryMinJsUrl)),
 		Now:          time.Now(),
 	}