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main.go
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main.go
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package main
import (
"bufio"
"bytes"
"flag"
"fmt"
"io"
"log"
"os"
"path/filepath"
"runtime"
"sync"
"sync/atomic"
"github.com/Bios-Marcel/discordemojimap"
"github.com/cheggaaa/pb/v3"
"github.com/diamondburned/disblob/inline"
"github.com/diamondburned/disblob/inline/css"
"github.com/diamondburned/disblob/inline/png"
"github.com/diamondburned/disblob/inline/svg"
)
// Spawn 2 times more workers than thread count.
var jobs = runtime.GOMAXPROCS(-1) * 2
// Broken selectors:
//
// `li[aria-label^=":%[1]s:"]>div` + "{"
const f_CSS = "" +
`img[src^="/assets"][alt=":%[1]s:"], ` + // used for emoji names
`img[alt="%[2]s"] ` + // used for unicodes
"{ " +
// Write the Firefox CSS fix where both versions of an emoji would appear
// (gk).
`object-position: var(--op); ` + // only for available emojis
`background-image: url("%[3]s"); ` +
"} "
type emojiFormat struct {
Path string
Ext string
}
var (
// Known formats.
svgFormat = emojiFormat{"svg", ".svg"}
pngFormat = emojiFormat{"png/128", ".png"}
// Flags.
preferPNG = false
noSvgo = false
verbose = false
)
func main() {
flag.IntVar(&png.Size, "size", png.Size, "PNG image size")
flag.BoolVar(&preferPNG, "png", preferPNG, "prefer PNG over SVG")
flag.BoolVar(&noSvgo, "nosvgo", noSvgo, "force no svgo for SVG")
flag.BoolVar(&verbose, "v", verbose, "show unfetched emojis")
flag.IntVar(&jobs, "j", jobs, "nubmer of jobs, default is thread count * 2")
flag.Parse()
var formats = []emojiFormat{svgFormat, pngFormat}
if preferPNG {
formats = []emojiFormat{pngFormat, svgFormat}
}
if !noSvgo && !hasSvgo() {
log.Fatalln("missing svgo (use -nosvgo or -png or install svgo)")
}
bufOut := bufio.NewWriterSize(os.Stdout, 40960) // 40KB
w := inline.WritePipeline(bufOut, css.Inline)
fmt.Fprintln(w, `
div[class^="reactionInner"] img.emoji,
div[class*="emojiSection-"] img.emoji,
span[class^="emojiContainer"] img.emoji {
/* value for object-position */
--op: -9999px -9999px;
/* background fix */
background-position: 0 !important;
background-size: contain !important;
background-repeat: no-repeat;
}
`)
type emojiFile struct {
Name string
Emoji string
}
emojiCh := make(chan emojiFile, jobs)
var wg sync.WaitGroup
var failed failTripper
progress := pb.New(len(discordemojimap.EmojiMap))
progress.SetWriter(os.Stderr)
if !verbose {
progress.Start()
}
for i := 0; i < jobs; i++ {
wg.Add(1)
go func() {
defer wg.Done()
// Dedicate each goroutine its own bytes buffers.
var reader io.ReadCloser
readBuf := bufio.NewReaderSize(reader, 20480) // reader buffer, 20KB
outBuf := bytes.Buffer{}
outBuf.Grow(10240) // pre-allocate 10KB
doEmoji := func(emoji emojiFile) {
p, err := BlobExists(emoji.Emoji, formats)
if err != nil {
if err != ErrNotFound {
failed.log("failed to open", emoji.Name, "", err)
return
}
logfail("skipping non-existent", emoji.Name, "", err)
return
}
fileExt := filepath.Ext(p)
if fileExt == ".svg" && !noSvgo && hasSvgo() {
reader, err = svgo(p)
} else {
reader, err = os.Open(p)
}
if err != nil {
failed.log("failed to open", emoji.Name, p, err)
return
}
// Close reader when done.
defer reader.Close()
// Reset the buffers before using.
readBuf.Reset(reader)
outBuf.Reset()
switch fileExt {
case ".png":
err = png.Inline(&outBuf, readBuf)
case ".svg":
err = svg.Inline(&outBuf, readBuf)
default:
// Skip unknown formats.
failed.log("unknown format of", emoji.Name, p, nil)
return
}
if err != nil {
failed.log("failed to inline", emoji.Name, p, err)
return
}
fmt.Fprintf(w, f_CSS, emoji.Name, emoji.Emoji, outBuf.Bytes())
}
for emoji := range emojiCh {
doEmoji(emoji)
progress.Increment()
}
}()
}
for name, emoji := range discordemojimap.EmojiMap {
emojiCh <- emojiFile{
Name: name,
Emoji: emoji,
}
}
// Mark that jobs are all distributed and wait for them to finish.
close(emojiCh)
wg.Wait()
progress.Finish()
if err := w.Close(); err != nil {
log.Fatalln("pipeline error:", err)
}
if err := bufOut.Flush(); err != nil {
log.Fatalln("flush error:", err)
}
if failed.isFailed() {
os.Exit(1)
}
}
type failTripper uint32
func (f *failTripper) fail() { atomic.StoreUint32((*uint32)(f), 1) }
func (f *failTripper) isFailed() bool { return atomic.LoadUint32((*uint32)(f)) > 0 }
func (f *failTripper) log(desc, name, path string, err error) {
f.fail()
logfail(desc, name, path, err)
}
func logfail(desc, name, path string, err error) {
if verbose {
log.Println(errfail(desc, name, path, err))
}
}
func errfail(desc, name, path string, err error) error {
var errstring string
if path != "" {
errstring += fmt.Sprintf(" (path: %s)", path)
}
if err != nil {
errstring = ": " + err.Error()
}
return fmt.Errorf("%s emoji %s%s", desc, name, errstring)
}