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transform.go
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transform.go
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package main
import (
"bytes"
"log"
"os"
"path"
"path/filepath"
"regexp"
"strconv"
)
// Yes I'm using a regex to parse HTML, yes everyone tells you not to do that.
// This is for personal sites so if this doesn't match your HTML, fix your HTML.
// This saves me having to do a bunch of tree traversal and serializing.
var imgRegex = regexp.MustCompile(`<img ([^>]*)src="([^"]+)"([^>]*)>`)
type transformConfig struct {
*config
manifest map[string]builtImage
pathToSlug map[string]string
}
func translatePath(conf *config, file string) string {
inputPath := path.Join(conf.basePath, conf.InputFolder)
relPath, err := filepath.Rel(inputPath, file)
if err != nil {
log.Fatalf("Can't make relative path %v", err)
}
return path.Join(conf.basePath, conf.OutputFolder, relPath)
}
func findImagePath(conf *config, fileDir string, relRef string) string {
if relRef[0] == '/' {
return relRef[1:len(relRef)]
} else {
return path.Join(fileDir, relRef)
}
}
func nameToImagePath(conf *config, name string) string {
return path.Join("/", conf.ImageFolder, name)
}
func rebuildImage(conf *transformConfig, relPath string, captures [][]byte) []byte {
keyPath := findImagePath(conf.config, relPath, string(captures[2]))
slug, ok := conf.pathToSlug[keyPath]
if !ok {
return captures[0]
}
built := conf.manifest[slug]
var buf bytes.Buffer
buf.WriteString("<img ")
buf.Write(captures[1])
buf.WriteString(`src="`)
buf.WriteString(nameToImagePath(conf.config, built.OriginalName))
buf.WriteString(`"`)
// if there's only one image no point in it being responsive
if len(built.Files) > 1 {
buf.WriteString(` srcset="`)
for i, builtFile := range built.Files {
if i != 0 {
buf.WriteString(`, `)
}
buf.WriteString(nameToImagePath(conf.config, builtFile.FileName))
buf.WriteString(` `)
buf.WriteString(strconv.Itoa(builtFile.Width))
buf.WriteString(`w`)
}
if conf.SizesAttr != "" {
buf.WriteString(`" sizes="`)
buf.WriteString(conf.SizesAttr)
buf.WriteString(`"`)
}
}
buf.Write(captures[3])
buf.WriteString(`>`)
return buf.Bytes()
}
func translateHtml(conf *transformConfig, inPath string, outPath string) (err error) {
// log.Printf("Translating %s", inPath)
bytes, err := readFileBytes(inPath)
// set up for HTML relative paths
inputPath := path.Join(conf.basePath, conf.InputFolder)
dirPath := path.Dir(inPath)
relPath, err := filepath.Rel(inputPath, dirPath)
if err != nil {
log.Fatalf("Can't make relative path %v", err)
}
// log.Printf("Relative path: %s", relPath)
newBytes := imgRegex.ReplaceAllFunc(bytes, func(match []byte) []byte {
captures := imgRegex.FindSubmatch(match)
// log.Printf("Old Image: %s", match)
rebuilt := rebuildImage(conf, relPath, captures)
// log.Printf("New Image: %s", rebuilt)
return rebuilt
})
df, err := os.Create(outPath)
if err != nil {
return err
}
defer df.Close()
df.Write(newBytes)
return
}
func transferAndTransform(conf *transformConfig, whitelist *[]string, file string) (err error) {
outPath := translatePath(conf.config, file)
// log.Printf("Walked %s, translate to %s", file, outPath)
err = os.MkdirAll(path.Dir(outPath), os.ModePerm)
extension := path.Ext(file)
*whitelist = append(*whitelist, outPath)
switch extension {
case ".html":
err = translateHtml(conf, file, outPath)
default:
err = copyFile(file, outPath)
}
return
}
func transferAndTransformAll(conf *transformConfig) (whitelist []string, err error) {
whitelist = []string{}
walkFunk := func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info.IsDir() {
return nil
}
return transferAndTransform(conf, &whitelist, path)
}
inputPath := path.Join(conf.basePath, conf.InputFolder)
err = filepath.Walk(inputPath, filepath.WalkFunc(walkFunk))
return
}
func deleteNonWhitelist(conf *config, whitelist []string) (err error) {
outputPath := path.Join(conf.basePath, conf.OutputFolder)
whiteMap := map[string]bool{}
for _, item := range whitelist {
whiteMap[item] = true
// TODO: this is wasteful as heck
trimmedPath := item
for {
trimmedPath = path.Dir(trimmedPath)
whiteMap[trimmedPath] = true
if trimmedPath == outputPath {
break
}
}
}
toRemove := []string{}
walkFunk := func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if _, ok := whiteMap[path]; !ok {
toRemove = append(toRemove, path)
if info.IsDir() {
return filepath.SkipDir
}
}
return nil
}
err = filepath.Walk(outputPath, filepath.WalkFunc(walkFunk))
if len(toRemove) > 0 {
log.Printf("Delete: %v\n", toRemove)
}
for _, item := range toRemove {
err = os.RemoveAll(item)
if err != nil {
return
}
}
return
}